CtrTrans

The field is mandatory present in the control transaction of a periodic assistance data delivery session as described in clauses 5.2.1a and 5.2.2a. Otherwise it is not present.

RTK

The field is mandatory present if the IE GNSS-RTK-Observations is included in IE GNSS‑GenericAssistData; otherwise it is not present.

GNSS‑ID‑SBAS

The field is mandatory present if the GNSS‑ID = sbas; otherwise it is not present.

GNSS‑ID‑BDS

The field may be present if the GNSS‑ID = bds; otherwise it is not present.

GNSS-ID-GLO

The field is optionally present, need ON, if the GNSS ID = glonass; otherwise it is not present.

GNSS-ID-NAVIC

The field is optionally present, need ON, if the GNSS‑ID = navic; otherwise it is not present

noFTA

The field may be present if gnss-ReferenceTimeForCells is absent; otherwise it is not present.

gnss-SystemTime

This field provides the specific GNSS system time.

networkTime

This field specifies the cellular network time at the epoch corresponding to gnss-SystemTime.

referenceTimeUnc

This field provides the accuracy of the relation between gnssSystemTime and networkTime time if IE networkTime is provided. When IE networkTime is not provided, this field can be included to provide the accuracy of the provided gnssSystemTime.

If GNSS TOD is the given GNSS time, then the true GNSS time, corresponding to the provided network time as observed at the target device location, lies in the interval [GNSS TOD – referenceTimeUnc, GNSS TOD + referenceTimeUnc].

The uncertainty r, expressed in microseconds, is mapped to a number K, with the following formula:

r = C*(((1+x)^K)-1)

with C = 0.5 and x = 0.14. To encode any higher value of uncertainty than that corresponding in the above formula to K=127, the same value, K=127, shall also be used. The uncertainty is then coded on 7 bits, as the binary encoding of K. Example values for the referenceTimeUnc Format: see table K to uncertainty relation below.

bsAlign

This flag, if present, indicates that the transmission timings of all cells sharing, depending on the RAT, the same carrier frequency and Tracking Area/Location Area/Routing Area as the cell indicated, are frame aligned. This information allows the target device to derive the GNSS – cellular time relation for any of these cells based on the timing relation information provided in GNSS-ReferenceTime. The flag should be set consistently in all these cells. This flag does not guarantee SFN alignment.

0

0 nanoseconds

1

70 nanoseconds

2

149.8 nanoseconds

–

–

50

349.62 microseconds

–

–

127

≥ 8.43 seconds

gnss-TimeID-glonass

The field may be present if gnss-TimeID=`glonass′; otherwise it is not present.

gnss-TimeID-gps

The field may be present if gnss-TimeID=`gps′; otherwise it is not present.

gnss-TimeID

This field specifies the GNSS for which the GNSS-SystemTime is provided.

gnss-DayNumber

This field specifies the sequential number of days (with day count starting at 0) from the origin of the GNSS System Time as follows:

GPS, QZSS, SBAS – Days from January 6^th 1980 00:00:00 UTC (USNO);

Galileo – Days from Galileo System Time (GST) start epoch, defined as 13 seconds before midnight between 21^st August and 22^nd August 1999; i.e., GST was equal to 13 seconds at August 22^nd 1999 00:00:00 UTC;

GLONASS – Days from December 31^st 1995 21:00:00 UTC (SU), which is local UTC Moscow

January 1^st 1996 00:00:00, defined as UTC(SU) + 3 hours in [9];

BDS – Days from January 1^st 2006 00:00:00 UTC (NTSC).

NavIC – Days from NavIC System Time start epoch, defined as 13 seconds before midnight between 21st

August and 22nd August 1999; i.e., NavIC System Time was equal to 00:00:00 at August 21st, 1999

23:55:47 UTC (BIPM).

gnss-TimeOfDay

This field specifies the integer number of seconds from the GNSS day change.

gnss-TimeOfDayFrac-msec

This field specifies the fractional part of the gnssTimeOfDay field in 1‑milli‑seconds resolution. The total GNSS TOD is gnss-TimeOfDay + gnssTimeOfDayFrac-msec.

notificationOfLeapSecond

This field specifies the notification of forthcoming leap second correction, as defined by parameter KP in [9, Table 4.7].

gps-TOW-Assist

This field contains several fields in the Telemetry (TLM) Word and Handover Word (HOW) that are currently being broadcast by the respective GPS satellites. Combining this information with GPS TOW enables the target device to know the entire 1.2-second (60-bit) pattern of TLM and HOW that is transmitted at the start of each six-second NAV subframe by the particular GPS satellite.

satelliteID

This field identifies the satellite for which the GPS-TOW-Assist is applicable. This field is identical to the GPS PRN Signal No. defined in [4].

tlmWord

This field contains a 14-bit value representing the Telemetry Message (TLM) being broadcast by the GPS satellite identified by the particular satelliteID, with the MSB occurring first in the satellite transmission, as defined in [4].

antiSpoof

This field contains the Anti-Spoof flag that is being broadcast by the GPS satellite identified by satelliteID, as defined in [4].

alert

This field contains the Alert flag that is being broadcast by the GPS satellite identified by satelliteID, as defined in [4].

tlmRsvdBits

This field contains the two reserved bits in the TLM Word being broadcast by the GPS satellite identified by satelliteID, with the MSB occurring first in the satellite transmission, as defined in [4].

EARFCN-max

The field is mandatory present if the corresponding earfcn (i.e. without suffix) is set to maxEARFCN. Otherwise the field is not present.

GNSSsynch

The field is present and set to 0 if NetworkTime is synchronized to gnss-SystemTime; otherwise the field is optionally present, need OR.

dataID

When dataID has the value ′11′ it indicates that the parameters have been generated by QZSS, and the parameters have been specialized and are applicable within the area defined in [7]. When dataID has the value ′01′ it indicates that the parameters have been generated by BDS, and UE shall use these parameters according to the description given in 5.2.4.7 in [23], [50]. When the dataID has the value ′10′, it indicates that the parameters have been generated by NavIC, and UE shall use these parameters according to the description given in [38]. When dataID has the value ′00′ it indicates the parameters are applicable worldwide [4], [7].

alpha0

This field specifies the ₀ parameter of the Klobuchar model, as specified in [4], [23], [38], [50].

Scale factor 2^-30 seconds.

alpha1

This field specifies the ₁ parameter of the Klobuchar model, as specified in [4], [23], [38], [50].

Scale factor 2^-27 seconds/semi-circle.

alpha2

This field specifies the ₂ parameter of the Klobuchar model, as specified in [4], [23], [38], [50].

Scale factor 2^-24 seconds/semi-circle².

alpha3

This field specifies the ₃ parameter of the Klobuchar model, as specified in [4], [23], [38], [50].

Scale factor 2^-24 seconds/semi-circle³.

beta0

This field specifies the ₀ parameter of the Klobuchar model, as specified in [4], [23], [38], [50].

Scale factor 2¹¹ seconds.

beta1

This field specifies the ₁ parameter of the Klobuchar model, as specified in [4], [23], [38], [50].

Scale factor 2¹⁴ seconds/semi-circle.

beta2

This field specifies the ₂ parameter of the Klobuchar model, as specified in [4], [23], [38, [50].

Scale factor 2¹⁶ seconds/semi-circle².

beta3

This field specifies the ₃ parameter of the Klobuchar model, as specified in [4], [23], [38], [50].

Scale factor 2¹⁶ seconds/semi-circle³.

alfa1

This field specifies the ₁ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

alfa2

This field specifies the ₂ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

alfa3

This field specifies the ₃ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

alfa4

This field specifies the ₄ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

alfa5

This field specifies the _ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor -2^-3 TECU.

alfa6

This field specifies the ₆ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

alfa7

This field specifies the ₇ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

alfa8

This field specifies the ₈ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

alfa9

This field specifies the ₉ parameter of the Klobuchar model, as specified in 7.8.1 in [39], [49].

Scale factor 2^-3 TECU.

ai0

Effective Ionisation Level 1^st order parameter.

Scale factor 2^-2 Solar Flux Units (SFUs), [8] clause 5.1.6.

ai1

Effective Ionisation Level 2^nd order parameter.

Scale factor 2^-8 Solar Flux Units/degree, [8] clause 5.1.6.

ai2

Effective Ionisation Level 3^rd order parameter.

Scale factor 2^-15 Solar Flux Units/degree², [8] clause 5.1.6.

ionoStormFlag1, ionoStormFlag2, ionoStormFlag3, ionoStormFlag4, ionoStormFlag5

These fields specify the ionosphere disturbance flags (1,…,5) for five different regions as described in [8], clause 5.1.6. If the ionosphere disturbance flag for a region is not present the target device shall treat the ionosphere disturbance condition as unknown.

teop

This field specifies the EOP data reference time in seconds, as specified in [4], [39].

Scale factor 2⁴ seconds.

pmX

This field specifies the X-axis polar motion value at reference time in arc-seconds, as specified in [4], [39], [49].

Scale factor 2^-20 arc-seconds.

pmXdot

This field specifies the X-axis polar motion drift at reference time in arc-seconds/day, as specified in [4], [39], [49].

Scale factor 2^-21 arc-seconds/day.

pmY

This field specifies the Y-axis polar motion value at reference time in arc-seconds, as specified in [4], [39], [49].

Scale factor 2^-20 arc-seconds.

pmYdot

This field specifies the Y-axis polar motion drift at reference time in arc-seconds/day, as specified in [4], [39], [49].

Scale factor 2^-21 arc-seconds/day.

deltaUT1

This field specifies the UT1-UTC difference at reference time in seconds, as specified in [4], [39], [49].

Scale factor 2^-24 seconds.

deltaUT1dot

This field specifies the Rate of UT1-UTC difference at reference time in seconds/day, as specified in [4], [39], [49]

Scale factor 2^-25 seconds/day.

NP

The field is optionally present, need ON, if the referenceStationIndicator has the value ′non-physical′; otherwise it is not present.

referenceStationID

The Reference Station ID is determined by the RTK service provider.

referenceStationIndicator

This fields specifies type of reference station. Enumerated value physical indicates a real, physical reference station; value non-physical indicates a non-physical or computed reference station.

antenna-reference-point-ECEF-X

This field specifies the antenna reference point X-coordinate in the World Geodetic System 1984 (WGS 84) datum.

Scale factor 0.0001 m; range ±13,743,895.3471 m.

antenna-reference-point-ECEF-Y

This field specifies the antenna reference point Y-coordinate in the World Geodetic System 1984 (WGS 84) datum.

Scale factor 0.0001 m; range ±13,743,895.3471 m.

antenna-reference-point-ECEF-Z

This field specifies the antenna reference point Z-coordinate in the World Geodetic System 1984 (WGS 84) datum.

Scale factor 0.0001 m; range ±13,743,895.3471 m.

antennaHeight

This field specifies the height of the Antenna Reference Point above the marker used in the survey campaign.

Scale factor 0.0001 m; range 0–6.5535 m.

antennaDescriptor

This field provides an ASCII descriptor of the reference station antenna using IGS naming convention [31]. The descriptor can be used to look up model specific phase centre corrections of that antenna.

antennaSetUpID

This field, if present, indicates that the standard IGS Model is not valid (≠ 0 [30]). If this field is absent the standard IGS Model is valid (′0 = Use standard IGS Model′ [30]).

antenna-reference-point-unc

This field specifies the uncertainty of the ARP coordinates. uncertainty-X, uncertainty-Y, and uncertainty-Z correspond to the encoded high accuracy uncertainty of the X, Y, and Z-coordinate, respectively, as defined in TS 23.032 [15]. confidence-X, confidence-Y, and confidence-Z corresponds to confidence as defined in TS 23.032 [15].

physical-reference-station-info

This field provides the earth-centred, earth-fixed (ECEF) coordinates of the antenna reference point (ARP) for the real (or "physical") reference station used. This field may be used in the case of the non-physical reference station approach to allow the target device to refer baseline vectors to a physical reference rather than to a non-physical reference without any connection to a physical point.

physicalReferenceStationID

This field specifies the station ID of a real reference station, when the referenceStationIndicator has the value ′non-physical′.

physical-ARP-ECEF-X

This field specifies the antenna reference point X-coordinate in the World Geodetic System 1984 (WGS 84) datum.

Scale factor 0.0001 m; range ±13,743,895.3471 m.

physical-ARP-ECEF-Y

This field specifies the antenna reference point Y-coordinate in the World Geodetic System 1984 (WGS 84) datum.

Scale factor 0.0001 m; range ±13,743,895.3471 m.

physical-ARP-ECEF-Z

This field specifies the antenna reference point Z-coordinate in the World Geodetic System 1984 (WGS 84) datum.

Scale factor 0.0001 m; range ±13,743,895.3471 m.

physical-ARP-unc

This field specifies the uncertainty of the ARP coordinates.

equalIntegerAmbiguityLevel

This field specifies the integer ambiguity level of this reference station in relation to other reference stations. Either, the presence or absence of allReferenceStations indicates whether the integer ambiguity level may be assumed to be aligned between all reference stations or not (interpreted as no alignment is facilitated from the location server), or referenceStationList provides a list of reference stations for which the integer ambiguity level may be assumed to be the same.

referenceStationID

This field specifies the Station ID for which the GNSS-RTK-Observations are provided.

clockSteeringIndicator

This field provides the clock steering indicator. The interpretation of the value is as follows:

0 clock steering is not applied

In this case, the receiver clock must be kept in the range of ±1 ms (approximately ±300 km)

1 clock steering has been applied

In this case, the receiver clock must be kept in the range of ±1 microsecond (approximately ±300 metres).

2 unknown clock steering status

3 reserved

externalClockIndicator

This field provides the external clock indicator. The interpretation of the value is as follows:

0 internal clock is used

1 external clock is used, clock status is "locked"

2 external clock is used, clock status is "not locked", which may indicate external clock failure and that the transmitted data may not be reliable.

3 unknown clock is used

smoothingIndicator

This field provides the GNSS Divergence-free Smoothing Indicator. The interpretation of the value is as follows:

1 Divergence-free smoothing is used

0 Other type of smoothing is used

smoothingInterval

The GNSS Smoothing Interval is the integration period over which the pseudorange code phase measurements are averaged using carrier phase information. Divergence-free smoothing may be continuous over the entire period for which the satellite is visible. A value of zero indicates no smoothing is used.

See table "smoothingInterval value to Smoothing Interval relation" below.

000 (0)

No smoothing

001 (1)

< 30 s

010 (2)

30-60 s

011 (3)

1-2 min

100 (4)

2-4 min

101 (5)

4-8 min

110 (6)

>8 min

111 (7)

Unlimited smoothing interval

networkID

This field defines the network and the source of the particular set of reference stations and their observation information. The RTK service provider should ensure that the networkID is unique in the region serviced. The networkID indicates an area and its reference stations where the service providers will provide a homogenous solution with levelled integer ambiguities between its reference stations. In general, the area indicated by networkID will comprise one subnetwork with a unique subNetworkID.

subNetworkID

This field identifies the subnetwork of a network identified by networkID. In general the area indicated by networkID will consist of one subnetwork. The subNetworkID indicates the actual solution number of integer ambiguity level. If one network has only one subnetwork, this indicates that an ambiguity level throughout the whole network is established.

master-referenceStationID

This field identifies the Master Reference Station.

aux-referenceStationID

This field identifies the Auxiliary Reference Station.

aux-master-delta-latitude

This field provides the delta value in latitude of Antenna Reference Point of "Auxiliary Reference Station minus Master Reference Station" in geographical coordinates based on GRS80 ellipsoid parameters for the same ECEF system as used in IE GNSS‑RTK‑ReferenceStationInfo.

Scale factor 25×10^-6 degrees; range ±13.1071 degrees.

aux-master-delta-longitude

This field provides the delta value in longitude of Antenna Reference Point of "Auxiliary Reference Station minus Master Reference Station" in geographical coordinates based on GRS80 ellipsoid parameters for the same ECEF system as used in IE GNSS‑RTK‑ReferenceStationInfo.

Scale factor 25×10^-6 degrees; range ±26.2142 degrees.

aux-master-delta-height

This field provides the delta value in ellipsoidal height of Antenna Reference Point of "Auxiliary Reference Station minus Master Reference Station" in geographical coordinates based on GRS80 ellipsoid parameters for the same ECEF system as used in IE GNSS‑RTK‑ReferenceStationInfo.

Scale factor 1 millimetre; range ±4194.303 m.

aux-ARP-unc

This field specifies the uncertainty of the auxiliary station ARP coordinates and comprise the following fields:

– horizontalUncertainty indicates the horizontal uncertainty of the ARP latitude/longitude. The ′horizontalUncertainty′ corresponds to the encoded high accuracy uncertainty as defined in TS 23.032 [15] and ′horizontalConfidence′ corresponds to confidence as defined in TS 23.032 [15].

– verticalUncertainty indicates the vertical uncertainty of the ARP altitude. The ‘verticalUncertainty‘ corresponds to the encoded high accuracy uncertainty as defined in TS 23.032 [15] and ‘verticalConfidence‘ corresponds to confidence as defined in TS 23.032 [15].

correctionPointSetID

This field provides the ID of the Atmospheric Correction Point set. It is a regionally unique arbitrary number that is used by the UE to ensure that the atmospheric corrections are being applied to the correct set of points.

referencePointLatitude

This field specifies the latitude for the reference point, expressed in the range of -90° , +90°, coded as a number between -2¹⁴ and 2¹⁴-1, coded in 2’s complement binary on 15 bits. The relation between the latitude X in the range [‑90°, 90°] and the coded number N is:

where denotes the greatest integer less than or equal to x (floor operator).

For the listOfCorrectionPoints, the reference point defines the 1^st correction point location.

For the arrayOfCorrectionPoints, the reference point defines the northwest corner of the correction point array.

referencePointLongitude

This field specifies the longitude for the reference point, expressed in the range -180°, +180°, coded as a number between -2¹⁵ and 2¹⁵-1, coded in 2’s complement binary on 16 bits. The relation between the longitude X in the range [-180°, 180°) and the coded number N is:

For the listOfCorrectionPoints, the reference point defines the 1^st correction point location.

For the arrayOfCorrectionPoints, the reference point defines the northwest corner of the correction point array.

relativeLocationsList

This field specifies the 2^nd, 3^rd, …, 64^th correction point location.

deltaLatitude

This field specifies the delta value in latitude of this correction point location relative to the previous point on the list or the reference point in the case of the first additional point, defined as "correction point location" minus "previous correction point location" in units of 0.01 degrees.

deltaLongitude

This field specifies the delta value in longitude of this correction point location relative to the previous point on the list or the reference point in the case of the first additional point, defined as "correction point location" minus "previous correction point location" in units of 0.01 degrees.

numberOfStepsLatitude, numberOfStepsLongitude

These fields specify the number of steps for latitude and longitude direction respectively.

stepOfLatitude, stepOfLongitude

These fields specify the spacing of the correction points for latitude and longitude respectively. The unit and scale factor is 0.01 degrees.

bitmaskOfGrids

This field specifies the availability of correction data at the correction points in the array. If a specific bit is enabled (set to ‘1’), the correction is available. Only the first numberOfStepsLatitude×numberOfStepsLongitude bits are used, the remainder are set to ‘0’. Starting with the northwest corner of the array (top left on a north oriented map) the correction points are enumerated with row precedence – first row west to east, second row west to east, until last row west to east – ending with the southeast corner of the array. If the field is omitted all correction points are used and none omitted.

irMinimum

This field specifies the Minimum Integrity Risk (IR) which is the minimum IR for which the error bounds provided in the IEs SSR-IntegrityOrbitBounds, SSR-IntegrityClockBounds, SSR-IntegrityCodeBiasBounds, SSR-IntegrityPhaseBiasBounds, STEC-IntegrityErrorBounds, and TropoDelayIntegrityErrorBounds are valid.

The IR is calculated by where n is the value of irMinimum and the range is 10^-10.2 to 1.

irMaximum

This field specifies the Maximum Integrity Risk (IR) which is the maximum IR for which the error bounds provided in the IEs SSR-IntegrityOrbitBounds, SSR-IntegrityClockBounds, SSR-IntegrityCodeBiasBounds, SSR-IntegrityPhaseBiasBounds, STEC-IntegrityErrorBounds, and TropoDelayIntegrityErrorBounds are valid.

The IR is calculated by where n is the value of irMaximum and the range is 10^-10.2 to 1.

ionosphereDoNotUse

This field indicates whether the ionospheric corrections in IE GNSS-SSR-STEC-Correction can be used for integrity related applications (FALSE) or not (TRUE).

troposphereDoNotUse

This field indicates whether the tropospheric corrections in IE GNSS-SSR-GriddedCorrection can be used for integrity related applications (FALSE) or not (TRUE).

gnss-TimeModelRefTime

This field specifies the reference time of week for GNSS-TimeModelElement and it is given in GNSS specific system time.

Scale factor 2⁴ seconds.

tA0

This field specifies the bias coefficient of the GNSS-TimeModelElement.

Scale factor 2^-35 seconds.

tA1

This field specifies the drift coefficient of the GNSS-TimeModelElement.

Scale factor of 2^-51 seconds/second.

tA2

This field specifies the drift rate correction coefficient of the GNSS-TimeModelElement.

Scale factor of 2^-68 seconds/second².

gnss-TO-ID

This field specifies the GNSS system time of the GNSS for which the GNSS-TimeModelElement is applicable. GNSS-TimeModelElement contains parameters to convert GNSS system time from the system indicated by GNSS‑ID to GNSS system time indicated by gnss-TO-ID. The conversion is defined in [4,5,6]. See table of gnss-TO-ID to Indication relation below. NOTE.

weekNumber

This field specifies the reference week of the GNSS-TimeModelElement given in GNSS specific system time. The location server should include this field, if tA1 or tA2 is included.

Scale factor 1 week.

deltaT

This field specifies the integer number of seconds of the GNSS-GNSS time offset provided in the GNSS-TimeModelElement.

Scale factor 1 second.

1

GPS

2

Galileo

3

QZSS

4

GLONASS

5

BDS

6

NavIC

7-15

reserved

dgnss-RefTime

This field specifies the time for which the DGNSS corrections are valid, modulo 1 hour. dgnss-RefTime is given in GNSS specific system time.

Scale factor 1‑second.

dgnss-SgnTypeList

This list includes differential correction data for different GNSS signal types, identified by GNSS-SignalID.

gnss-StatusHealth

This field specifies the status of the differential corrections. The values of this field and their respective meanings are defined as in table gnss-StatusHealth Value to Indication relation below.

The first six values in this field indicate valid differential corrections. When using the values described below, the "UDRE Scale Factor" value is applied to the UDRE values contained in the element. The purpose is to indicate an estimate in the amount of error in the corrections.

The value "110" indicates that the source of the differential corrections (e.g., reference station or external DGNSS network) is currently not being monitored. The value "111" indicates that the corrections provided by the source are invalid, as judged by the source.

dgnss-SatList

This list includes differential correction data for different GNSS satellites, identified by SV-ID.

iod

This field specifies the Issue of Data field which contains the identity for the GNSS-NavigationModel.

udre

This field provides an estimate of the uncertainty (1-σ) in the corrections for the particular satellite. The value in this field shall be multiplied by the UDRE Scale Factor in the gnss-StatusHealth field to determine the final UDRE estimate for the particular satellite. The meanings of the values for this field are shown in the table udre Value to Indication relation below.

pseudoRangeCor

This field specifies the correction to the pseudorange for the particular satellite at dgnss-RefTime, t₀. The value of this field is given in metres and the scale factor is 0.32 metres in the range of ±655.04 metres. The method of calculating this field is described in [11].

If the location server has received a request for GNSS assistance data from a target device which included a request for the GNSS Navigation Model and DGNSS, the location server shall determine, for each satellite, if the navigation model stored by the target device is still suitable for use with DGNSS corrections and if so and if DGNSS corrections are supported the location server should send DGNSS corrections without including the GNSS Navigation Model.

The iod value sent for a satellite shall always be the IOD value that corresponds to the navigation model for which the pseudo-range corrections are applicable.

The target device shall only use the pseudoRangeCor value when the IOD value received matches its available navigation model.

Pseudo-range corrections are provided with respect to GNSS specific geodetic datum (e.g., PZ-90.02 if GNSS‑ID indicates GLONASS).

Scale factor 0.32 metres.

rangeRateCor

This field specifies the rate-of-change of the pseudorange correction for the particular satellite, using the satellite ephemeris and clock corrections identified by the iod field. The value of this field is given in metres per second and the resolution is 0.032 metres/second in the range of ±4.064 metres/second. For some time t₁ > t₀, the corrections for iod are estimated by

PRC(t₁, IOD) = PRC(t₀, IOD) + RRC(t₀,IOD)⋅(t₁ – t₀),

and the target device uses this to correct the pseudorange it measures at t₁, PR_m(t₁,IOD), by

PR(t₁, IOD) = PR_m(t₁, IOD) + PRC(t₁, IOD) .

The location server shall always send the RRC value that corresponds to the PRC value that it sends. The target device shall only use the RRC value when the iod value received matches its available navigation model.

Scale factor 0.032 metres/second.

udreGrowthRate

This field provides an estimate of the growth rate of uncertainty (1-σ) in the corrections for the particular satellite identified by SV-ID. The estimated UDRE at time value specified in the udreValidityTime t₁ is calculated as follows:

UDRE(t₀+t₁) = UDRE(t₀) × udreGrowthRate ,

where t₀ is the DGNSS Reference Time dgnss-RefTime for which the corrections are valid, t₁ is the udreValidityTime

field, UDRE(t₀) is the value of the udre field, and udreGrowthRate field is the factor as shown in the table Value of udreGrowthRate to Indication relation below.

udreValidityTime

This field specifies the time when the udreGrowthRate field applies and is included if udreGrowthRate is included. The meaning of the values for this field is as shown in the table Value of udreValidityTime to Indication relation below.

000

UDRE Scale Factor = 1.0

001

UDRE Scale Factor = 0.75

010

UDRE Scale Factor = 0.5

011

UDRE Scale Factor = 0.3

100

UDRE Scale Factor = 0.2

101

UDRE Scale Factor = 0.1

110

Reference Station Transmission Not Monitored

111

Data is invalid – disregard

00

UDRE ≤ 1.0 m

01

1.0 m < UDRE ≤ 4.0 m

10

4.0 m < UDRE ≤ 8.0 m

11

8.0 m < UDRE

000

1.5

001

2

010

4

011

6

100

8

101

10

110

12

111

16

000

20

001

40

010

80

011

160

100

320

101

640

110

1280

111

2560

nonBroadcastIndFlag

This field indicates if the GNSS-NavigationModel elements are not derived from satellite broadcast data or are given in a format not native to the GNSS. A value of 0 means the GNSS-NavigationModel data elements correspond to GNSS satellite broadcasted data; a value of 1 means the GNSS-NavigationModel data elements are not derived from satellite broadcast.

gnss-SatelliteList

This list provides ephemeris and clock corrections for GNSS satellites indicated by SV‑ID.

svHealth

This field specifies the satellite’s current health. The health values are GNSS system specific. The interpretation of svHealth depends on the GNSS‑ID and is as shown in table GNSS to svHealth Bit String(8) relation below.

iod

This field specifies the Issue of Data and contains the identity for GNSS Navigation Model.

In the case of broadcasted GPS NAV ephemeris, the iod contains the IODC as described in [4].

In the case of broadcasted Modernized GPS ephemeris, the iod contains the 11-bit parameter t_oe as defined in [4, Table 30-I] [6, Table 3.5-1].

In the case of broadcasted SBAS ephemeris, the iod contains the 8 bits Issue of Data as defined in [10] Message Type 9.

In the case of broadcasted QZSS QZS-L1 ephemeris, the iod contains the IODC as described in [7].

In the case of broadcasted QZSS QZS-L1C/L2C/L5 ephemeris, the iod contains the 11-bit parameter t_oe as defined in [7].

In the case of broadcasted GLONASS ephemeris, the iod contains the parameter t_b as defined in [9].

In the case of broadcasted Galileo ephemeris, the iod contains the IOD index as described in [8].

In the case of broadcasted BDS B1I/B3I ephemeris, the iod contains 11 MSB bits of the t_oe as defined in [23], [50].

In the case of broadcasted BDS B1C/B2a ephemeris, the iod contains the IODC as described in [39], [49].

In the case of broadcasted NavIC ephemeris, the iod contains 11 MSB bits of the toe as defined in [38].

The interpretation of iod depends on the GNSS‑ID and is as shown in table GNSS to iod Bit String(11) relation below.

svHealthExt

This field specifies the satellite’s additional current health. The health values are GNSS system specific. The interpretation of svHealthExt depends on the GNSS‑ID and is as shown in table GNSS to svHealthExt Bit String(4) relation below.

Bit 1

(MSB)

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

Bit 8 (LSB)

GPS L1/CA⁽¹⁾

SV Health [4]

‘0’

(reserved)

‘0’

(reserved)

Modernized GPS⁽²⁾

L1C Health

[6]

L1 Health [4,5]

L2 Health

[4,5]

L5 Health [4,5]

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

SBAS⁽³⁾

Ranging

On (0),Off(1) [10]

Corrections On(0),Off(1) [10]

Integrity

On(0),Off(1)[10]

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

QZSS⁽⁴⁾

QZS-L1

SV Health [7]

‘0’

(reserved)

‘0’

(reserved)

QZSS⁽⁵⁾

QZS‑

L1C/L2C/L5

L1C Health

[7]

L1 Health

[7]

L2 Health

[7]

L5 Health

[7]

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

GLONASS

B_n (MSB)

[9, page 30]

F_T [9, Table 4.4]

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

Galileo

[8, clause 5.1.9.3]

E5a Data Validity Status

E5b Data Validity Status

E1-B Data Validity Status

E5a Signal Health Status

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

BDS⁽⁶⁾ B1I

[23]

B1I Health (SatH1) [23], [50]

B3I Health (SatH1) [23], [50]

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

BDS⁽⁷⁾ B1C

[39]/B2a [49]

Sat Clock Health [39], [49]

B1C Health

[39], [49]

B2a Health

[39],[49]

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

NavIC

L5 health

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

‘0’

(reserved)

Bit 1

(MSB)

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

Bit 8

Bit 9

Bit 10

Bit 11

(LSB)

GPS L1/CA

‘0’

Issue of Data, Clock [4]

Modernized GPS

t_oe (seconds, scale factor 300, range 0 – 604500) [4,5,6]

SBAS

‘0’

‘0’

‘0’

Issue of Data ([10], Message Type 9)

QZSS QZS-L1

‘0’

Issue of Data, Clock [7]

QZSS

QZS-L1C/L2C/L5

t_oe (seconds, scale factor 300, range 0 – 604500) [7]

GLONASS

‘0’

‘0’

‘0’

‘0’

t_b (minutes, scale factor 15) [9]

Galileo

‘0’

IODnav [8]

BDS B1I/B3I

11 MSB bits of t_oe (seconds, scale factor 512, range 0 – 604672) [23], [50]

BDS B1C/B2a

‘0’

Issue of Data, Clock [39], [49]

NavIC

11 MSB bits of t_oe (seconds, scale factor 512) [38]

Bit 1

(MSB)

Bit 2

Bit 3

Bit 4

(LSB)

Galileo [8, clause 5.1.9.3]

E5b Signal Health Status

E1-B Signal Health Status

standardClockModelList

gnss-ClockModel Model-1 contains one or two clock model elements. If included, clock Model-1 shall be included once or twice depending on the target device capability.

If the target device is supporting multiple Galileo signals, the location server shall include both F/Nav and I/Nav clock models in gnss-ClockModel if the location server assumes the target device to perform location information calculation using multiple signals.

stanClockToc

Parameter t_oc defined in [8].

Scale factor 60 seconds.

stanClockAF2

Parameter af₂ defined in [8].

Scale factor 2^-59 seconds/second².

stanClockAF1

Parameter af₁ defined in [8].

Scale factor 2^-46 seconds/second.

stanClockAF0

Parameter af₀ defined in [8].

Scale factor 2^-34 seconds.

stanClockTgd

Parameter T_GD, Broadcast Group Delay (BGD), defined in [8].

Scale factor 2^-32 seconds.

This field is required if the target device supports only single frequency Galileo signal.

sisa

Signal-In-Space Accuracy (SISA), defined in [8] clause 5.1.11.

stanModelID

This field specifies the identity of the clock model according to the table Value of stanModelID to Identity relation below. This field is required if the location server includes both F/Nav and I/Nav Galileo clock models in gnss-ClockModel.

0

I/Nav (E1,E5b)

1

F/Nav (E1,E5a)

navToc

Parameter t_oc, time of clock (seconds) [4,7]

Scale factor 2⁴ seconds.

navaf2

Parameter a_f2, clock correction polynomial coefficient (sec/sec²) [4,7].

Scale factor 2^-55 seconds/second².

navaf1

Parameter a_f1, clock correction polynomial coefficient (sec/sec) [4,7].

Scale factor 2^-43 seconds/second.

navaf0

Parameter a_f0, clock correction polynomial coefficient (seconds) [4,7].

Scale factor 2^-31 seconds.

navTgd

Parameter T_GD, group delay (seconds) [4,7].

Scale factor 2^-31 seconds.

cnavToc

Parameter t_oc, clock data reference time of week (seconds) [4,5,6,7].

Scale factor 300 seconds.

cnavTop

Parameter t_op, clock data predict time of week (seconds) [4,5,6,7].

Scale factor 300 seconds

cnavURA0

Parameter URA_oc Index, SV clock accuracy index (dimensionless) [4,5,6,7].

cnavURA1

Parameter URA_oc1 Index, SV clock accuracy change index (dimensionless) [4,5,6,7].

cnavURA2

Parameter URA_oc2 Index, SV clock accuracy change rate index (dimensionless) [4,5,6,7].

cnavAf2

Parameter a_f2-n, SV clock drift rate correction coefficient (sec/sec²) [4,5,6,7].

Scale factor 2^-60 seconds/second².

cnavAf1

Parameter a_f1-n, SV clock drift correction coefficient (sec/sec) [4,5,6,7].

Scale factor 2^-48 seconds/second.

cnavAf0

Parameter a_f0-n, SV clock bias correction coefficient (seconds) [4,5,6,7].

Scale factor 2^-35 seconds.

cnavTgd

Parameter T_GD, Group delay correction (seconds) [4,5,6,7].

Scale factor 2^-35 seconds.

cnavISCl1cp

Parameter ISC_L1CP, inter signal group delay correction (seconds) [6,7].

Scale factor 2^-35 seconds.

The location server should include this field if the target device is GPS capable and supports the L1_C signal.

cnavISCl1cd

Parameter ISC_L1CD, inter signal group delay correction (seconds) [6,7].

Scale factor 2^-35 seconds.

The location server should include this field if the target device is GPS capable and supports the L1_C signal.

cnavISCl1ca

Parameter ISC_L1C/A, inter signal group delay correction (seconds) [4,5,7].

Scale factor 2^-35 seconds.

The location server should include this field if the target device is GPS capable and supports the L1_CA signal.

cnavISCl2c

Parameter ISC_L2C, inter signal group delay correction (seconds) [4,5,7].

Scale factor 2^-35 seconds.

The location server should include this field if the target device is GPS capable and supports the L2_C signal.

cnavISCl5i5

Parameter ISC_L5I5, inter signal group delay correction (seconds) [5,7].

Scale factor 2^-35 seconds.

The location server should include this field if the target device is GPS capable and supports the L5 signal.

cnavISCl5q5

Parameter ISC_L5Q5, inter signal group delay correction (seconds) [5,7].

Scale factor 2^-35 seconds.

The location server should include this field if the target device is GPS capable and supports the L5 signal.

gloTau

Parameter _n(t_b), satellite clock offset (seconds) [9].

Scale factor 2^-30 seconds.

gloGamma

Parameter _n(t_b), relative frequency offset from nominal value (dimensionless) [9].

Scale factor 2^-40.

gloDeltaTau

Parameter _n, time difference between transmission in G2 and G1 (seconds) [9].

Scale factor 2^-30 seconds.

The location server should include this parameter if the target device is dual frequency GLONASS receiver capable.

sbasTo

Parameter t₀ [10].

Scale factor 16 seconds.

sbasAgfo

Parameter a_Gfo [10].

Scale factor 2^-31 seconds.

sbasAgf1

Parameter a_Gf1 [10].

Scale factor 2^-40 seconds/second.

bdsToc

Parameter T_oc, Time of clock (seconds) [23], [50].

Scale factor 2³ seconds.

bdsA0

Parameter a_0, Clock correction polynomial coefficient (seconds) [23], [50].

Scale factor 2^-33 seconds.

bdsA1

Parameter a_1, Clock correction polynomial coefficient (sec/sec) [23], [50].

Scale factor 2^-50 sec/sec.

bdsA2

Parameter a_2, Clock correction polynomial coefficient (sec/sec²) [23], [50].

Scale factor 2^-66 sec/sec².

bdsTgd1

Parameter Equipment group delay differential T_GD1 [23], [50].

Scale factor is 0.1 nanosecond.

bdsTgd2

Parameter Equipment group delay differential T_GD2 [23], [50].

Scale factor is 0.1 nanosecond.

bdsToc

Parameter T_oc, Clock correction parameters reference time (seconds), see [39], 7.5.1 and [49], 7.5.1.

Scale factor 300 seconds.

bdsA0

Parameter a_0, Satellite clock time bias correction coefficient (seconds), see [39], 7.5.1 and [49], 7.5.1.

Scale factor 2^-34 seconds.

bdsA1

Parameter a_1, Satellite clock time drift correction coefficient (sec/sec), see [39], 7.5.1 and [49], 7.5.1.

Scale factor 2^-50 sec/sec.

bdsA2

Parameter a_2, Satellite clock time drift rate correction coefficient (sec/sec²), see [39], 7.5.1 and [49], 7.5.1.

Scale factor 2^-66 sec/sec².

bdsTgdB1Cp

Parameter T_GDB1Cp Group delay differential of the B1C pilot component (seconds), see [39], 7.6.1 and [49], 7.6.1.

Scale factor is 2^-34 seconds.

bdsIscB1Cd

Parameter ISC_B1Cd Group delay differential between the B1C data and pilot components (seconds), see [39], 7.6.1.

Scale factor is 2^-34 seconds.

bdsTgdB2ap

Parameter T_GDB2ap Group delay differential of the B2a pilot component (seconds), see [39], 7.6.1 and [49], 7.6.1.

Scale factor is 2^-34 seconds.

bdsIscB2ad

Parameter ISC_B2ad Group delay differential between the B2a data and pilot components (seconds), see [49], 7.6.1.

Scale factor is 2^-34 seconds.

navic-Toc

Parameter t_oc, time of clock (seconds) [38], Table-11.

Scale factor 2⁴ seconds.

navic-af2

Parameter a_f2, clock correction polynomial coefficient (sec/sec²) [38].

Scale factor 2^-55 seconds/second².

navic-af1

Parameter a_f1, clock correction polynomial coefficient (sec/sec) [38].

Scale factor 2^-43 seconds/second.

navic-af0

Parameter a_f0, clock correction polynomial coefficient (seconds) [38].

Scale factor 2^-31 seconds.

navic-Tgd

Parameter T_GD, group delay (seconds) [38].

Scale factor 2^-31 seconds.

keplerToe

Parameter toe, time-of-ephemeris in seconds [8].

Scale factor 60 seconds.

keplerW

Parameter ω, argument of perigee (semi-circles) [8].

Scale factor 2^-31 semi-circles.

keplerDeltaN

Parameter n, mean motion difference from computed value (semi-circles/sec) [8].

Scale factor 2^-43 semi-circles/second.

keplerM0

Parameter M0, mean anomaly at reference time (semi-circles) [8].

Scale factor 2^-31 semi-circles.

keplerOmegaDot

Parameter OMEGAdot, rate of change of right ascension (semi-circles/sec) [8].

Scale factor 2^-43 semi-circles/second.

keplerE

Parameter e, eccentricity [8].

Scale factor 2^-33.

KeplerIDot

Parameter Idot, rate of change of inclination angle (semi-circles/sec) [8].

Scale factor 2^-43 semi-circles/second.

keplerAPowerHalf

Parameter sqrtA, square root of semi-major Axis in (metres) ^½ [8].

Scale factor 2^-19 metres^½.

keplerI0

Parameter i0, inclination angle at reference time (semi-circles) [8].

Scale factor 2^-31 semi-circles.

keplerOmega0

Parameter OMEGA0, longitude of ascending node of orbit plane at weekly epoch (semi-circles) [8].

Scale factor 2^-31 semi-circles.

keplerCrs

Parameter Crs, amplitude of the sine harmonic correction term to the orbit radius (metres) [8].

Scale factor 2^-5 metres.

keplerCis

Parameter Cis, amplitude of the sine harmonic correction term to the angle of inclination (radians) [8].

Scale factor 2^-29 radians.

keplerCus

Parameter Cus, amplitude of the sine harmonic correction term to the argument of latitude (radians) [8].

Scale factor 2^-29 radians.

keplerCrc

Parameter Crc, amplitude of the cosine harmonic correction term to the orbit radius (metres) [8].

Scale factor 2^-5 metres.

keplerCic

Parameter Cic, amplitude of the cosine harmonic correction term to the angle of inclination (radians) [8].

Scale factor 2^-29 radians.

keplerCuc

Parameter Cuc, amplitude of the cosine harmonic correction term to the argument of latitude (radians) [8].

Scale factor 2^-29 radians.

navURA

Parameter URA Index, SV accuracy (dimensionless) [4,7].

navFitFlag

Parameter Fit Interval Flag, fit interval indication (dimensionless) [4,7]

navToe

Parameter t_oe, time of ephemeris (seconds) [4,7].

Scale factor 2⁴ seconds.

navOmega

Parameter ω, argument of perigee (semi-circles) [4,7].

Scale factor 2^-31 semi-circles.

navDeltaN

Parameter Δn, mean motion difference from computed value (semi-circles/sec) [4,7].

Scale factor 2^-43 semi-circles/second.

navM0

Parameter M₀, mean anomaly at reference time (semi-circles) [4,7].

Scale factor 2^-31 semi-circles.

navOmegaADot

Parameter , rate of right ascension (semi-circles/sec) [4,7].

Scale factor 2^-43 semi-circles/second.

navE

Parameter e, eccentricity (dimensionless) [4,7].

Scale factor 2^-33.

navIDot

Parameter IDOT, rate of inclination angle (semi-circles/sec) [4,7].

Scale factor 2^-43 semi-circles/second.

navAPowerHalf

Parameter , square root of semi-major axis (metres^/2) [4,7].

Scale factor 2^-19 metres^½.

navI0

Parameter i₀, inclination angle at reference time (semi-circles) [4,7].

Scale factor 2^-31 semi-circles.

navOmegaA0

Parameter ₀, longitude of ascending node of orbit plane at weekly epoch (semi-circles) [4,7].

Scale factor 2^-31 semi-circles.

navCrs

Parameter C_rs, amplitude of sine harmonic correction term to the orbit radius (metres) [4,7].

Scale factor 2^-5 metres.

navCis

Parameter C_is, amplitude of sine harmonic correction term to the angle of inclination (radians) [4,7].

Scale factor 2^-29 radians.

navCus

Parameter C_us, amplitude of sine harmonic correction term to the argument of latitude (radians) [4,7].

Scale factor 2^-29 radians.

navCrc

Parameter C_rc, amplitude of cosine harmonic correction term to the orbit radius (metres) [4,7].

Scale factor 2^-5 metres.

navCic

Parameter C_ic, amplitude of cosine harmonic correction term to the angle of inclination (radians) [4,7].

Scale factor 2^-29 radians.

navCuc

Parameter C_uc, amplitude of cosine harmonic correction term to the argument of latitude (radians) [4,7].

Scale factor 2^-29 radians.

addNAVparam

These fields include data and reserved bits in the GPS NAV message [4,14].

These additional navigation parameters, if provided by the location server, allow the target device to perform data wipe-off similar to what is done by the target device with the GNSS-DataBitAssistance.

cnavTop

Parameter t_op, data predict time of week (seconds) [4,5,6,7].

Scale factor 300 seconds.

cnavURAindex

Parameter URA_oe Index, SV accuracy (dimensionless) [4,5,6,7].

cnavDeltaA

Parameter A, semi-major axis difference at reference time (metres) [4,5,6,7].

Scale factor 2^-9 metres.

cnavAdot

Parameter , change rate in semi-major axis (metres/second) [4,5,6,7].

Scale factor 2^-21 metres/second.

cnavDeltaNo

Parameter n₀, mean motion difference from computed value at reference time (semi-circles/sec) [4,5,6,7].

Scale factor 2^-44 semi-circles/second.

cnavDeltaNoDot

Parameter , rate of mean motion difference from computed value (semi-circles/sec²) [4,5,6,7].

Scale factor 2^-57 semi-circles/second².

cnavMo

Parameter M_0-n, mean anomaly at reference time (semi-circles) [4,5,6,7].

Scale factor 2^-32 semi-circles.

cnavE

Parameter e_n, eccentricity (dimensionless) [4,5,6,7].

Scale factor 2^-34.

cnavOmega

Parameter _n, argument of perigee (semi-circles) [4,5,6,7].

Scale factor 2^-32 semi-circles.

cnavOMEGA0

Parameter _0-n, reference right ascension angle (semi-circles) [4,5,6,7].

Scale factor 2^-32 semi-circles.

cnavDeltaOmegaDot

Parameter , rate of right ascension difference (semi-circles/sec) [4,5,6,7].

Scale factor 2^-44 semi-circles/second.

cnavIo

Parameter i_o-n, inclination angle at reference time (semi-circles) [4,5,6,7].

Scale factor 2^-32 semi-circles.

cnavIoDot

Parameter I_0-n-DOT, rate of inclination angle (semi-circles/sec) [4,5,6,7].

Scale factor 2^-44 semi-circles/second.

cnavCis

Parameter C_is-n, amplitude of sine harmonic correction term to the angle of inclination (radians) [4,5,6,7].

Scale factor 2^-30 radians.

cnavCic

Parameter C_ic-n, amplitude of cosine harmonic correction term to the angle of inclination (radians) [4,5,6,7].

Scale factor 2^-30 radians.

cnavCrs

Parameter C_rs-n, amplitude of sine harmonic correction term to the orbit radius (metres) [4,5,6,7].

Scale factor 2^-8 metres.

cnavCrc

Parameter C_rc-n, amplitude of cosine harmonic correction term to the orbit radius (metres) [4,5,6,7].

Scale factor 2^-8 metres.

cnavCus

Parameter C_us-n, amplitude of the sine harmonic correction term to the argument of latitude (radians) [4,5,6,7].

Scale factor 2^-30 radians.

cnavCuc

Parameter C_uc-n, amplitude of cosine harmonic correction term to the argument of latitude (radians) [4,5,6,7].

Scale factor 2^-30 radians.

gloEn

Parameter E_n, age of data (days) [9].

Scale factor 1 days.

gloP1

Parameter P1, time interval between two adjacent values of t_b (minutes) [9].

gloP2

Parameter P2, change of t_b flag (dimensionless) [9].

gloM

Parameter M, type of satellite (dimensionless) [9].

gloX

Parameter , x-coordinate of satellite at time t_b (kilometres) [9].

Scale factor 2^-11 kilometres.

gloXdot

Parameter , x-coordinate of satellite velocity at time t_b (kilometres/second) [9].

Scale factor 2^-20 kilometres/second.

gloXdotdot

Parameter , x-coordinate of satellite acceleration at time t_b (kilometres/second²) [9].

Scale factor 2^-30 kilometres/second².

gloY

Parameter , y-coordinate of satellite at time t_b (kilometres) [9].

Scale factor 2^-11 kilometres.

gloYdot

Parameter , y-coordinate of satellite velocity at time t_b (kilometres/second) [9].

Scale factor 2^-20 kilometres/second.

gloYdotdot

Parameter , y-coordinate of satellite acceleration at time t_b (kilometres/second²) [9].

Scale factor 2^-30 kilometres/second².

gloZ

Parameter , z-coordinate of satellite at time t_b (kilometres) [9].

Scale factor 2^-11 kilometres.

gloZdot

Parameter , z-coordinate of satellite velocity at time t_b (kilometres/second) [9].

Scale factor 2^-20 kilometres/second.

gloZdotdot

Parameter , z-coordinate of satellite acceleration at time t_b (kilometres/second²) [9].

Scale factor 2^-30 kilometres/second².

ClockModel

This field is mandatory present if gnss-ClockModel Model‑5 is not included; otherwise it is not present.

sbasTo

Parameter t₀, time of applicability (seconds) [10].

Scale factor 16 seconds.

sbasAccuracy

Parameter Accuracy, (dimensionless) [10].

sbasXg

Parameter X_G, (metres) [10].

Scale factor 0.08 metres.

sbasYg

Parameter Y_G, (metres) [10].

Scale factor 0.08 metres.

sbasZg

Parameter Z_G, (metres) [10].

Scale factor 0.4 metres.

sbasXgDot

Parameter X_G, Rate‑of‑Change, (metres/second) [10].

Scale factor 0.000625 metres/second.

sbasYgDot

Parameter Y_G, Rate‑of‑Change, (metres/second) [10]

Scale factor 0.000625 metres/second.

sbasZgDot

Parameter Z_G, Rate‑of‑Change, (metres/second) [10].

Scale factor 0.004 metres/second.

sbasXgDotDot

Parameter X_G, Acceleration, (metres/second²) [10].

Scale factor 0.0000125 metres/second².

sbagYgDotDot

Parameter Y_G, Acceleration, (metres/second²) [10].

Scale factor 0.0000125 metres/second².

sbasZgDotDot

Parameter Z_G Acceleration, (metres/second²) [10].

Scale factor 0.0000625 metres/second².

bdsURAI

Parameter URA Index, URA is used to describe the signal-in-space accuracy in metres as defined in [23], [50].

bdsToe

Parameter t_oe, Ephemeris reference time (seconds) [23], [50].

Scale factor 2³ seconds.

bdsAPowerHalf

Parameter A^1/2, Square root of semi-major axis (metres^/2) [23], [50].

Scale factor 2^-19 metres^/2.

bdsE

Parameter e, Eccentricity, dimensionless [23], [50].

Scale factor 2^-33.

bdsW

Parameter , Argument of perigee (semi-circles) [23], [50].

Scale factor 2^-31 semi-circles.

bdsDeltaN

Parameter n, Mean motion difference from computed value (semi-circles/sec) [23], [50].

Scale factor 2^-43 semi-circles/second.

bdsM0

Parameter M_0, Mean anomaly at reference time (semi-circles) [23], [50].

Scale factor 2^-31 semi-circles.

bdsOmega0

Parameter _0, Longitude of ascending node of orbital of plane computed according to reference time (semi-circles) [23], [50].

Scale factor 2^-31 semi-circles.

bdsOmegaDot

Parameter  Rate of right ascension (semi-circles/sec) [23], [50].

Scale factor 2^-43 semi-circles/second.

bdsI0

Parameter i0, Inclination angle at reference time (semi-circles) [23], [50].

Scale factor 2^-31 semi-circles.

bdsIDot

Parameter Idot, Rate of inclination angle (semi-circles/sec) [23], [50].

Scale factor 2^-43 semi-circles/second.

bdsCuc

Parameter Cuc, Amplitude of cosine harmonic correction term to the argument of latitude (radians) [23], [50].

Scale factor 2^-31 radians.

bdsCus

Parameter Cus, Amplitude of sine harmonic correction term to the argument of latitude (radians) [23], [50].

Scale factor 2^-31 radians.

bdsCrc

Parameter Crc, Amplitude of cosine harmonic correction term to the orbit radius (metres) [23], [50].

Scale factor 2^-6 metres.

bdsCrs

Parameter Crs, Amplitude of sine harmonic correction term to the orbit radius (metres) [23], [50].

Scale factor 2^-6 metres.

bdsCic

Parameter Cic, Amplitude of cosine harmonic correction term to the angle of inclination (radians) [23], [50].

Scale factor 2^-31 radians.

bdsCis

Parameter Cis, Amplitude of sine harmonic correction term to the angle of inclination (radians) [23], [50].

Scale factor 2^-31 radians.

bdsToe

Parameter t_oe, Ephemeris reference time (seconds), defined in [39], 7.7.1 and [49], 7.7.1.

Scale factor 300 seconds.

bdsDeltaA

Parameter A, Semi-major axis difference at reference time (metre), defined in [39], 7.7.1 and [49], 7.7.1.

Scale factor 2^-9 metres.

bdsAdot

Parameter , Change rate in semi-major axis (metre/second), defined in [39], 7.7.1 and [49], 7.7.1.

Scale factor 2^-21 metre/second.

The value 16777216 is not signalled.

bdsDeltaN0

Parameter n₀, Mean motion difference from computed value at reference time (semi-circles /sec), defined in [39], 7.7.1 and [49], 7.7.1.

Scale factor 2^-44 semi-circles /second.

bdsDeltaN0dot

Parameter n₀dot, Rate of mean motion difference from computed value at reference time (semi-circles /sec²), defined in [39], 7.7.1 and [49], 7.7.1.

Scale factor 2^-57 semi-circles /second².

bdsM0

Parameter M_0, Mean anomaly at reference time (semi-circles) [39], [49].

Scale factor 2^-32 semi-circles.

bdsE

Parameter e, Eccentricity [39], [49].

Scale factor 2^-34.

bdsOmega

Parameter  Argument of perigee (semi-circles) [39], [49].

Scale factor 2^-32 semi-circles.

bdsOmega0

Parameter_0, Longitude of ascending node of orbital plane at weekly epoch (semi-circles) [39], [49].

Scale factor 2^-32 semi-circles.

bdsI0

Parameter i0, Inclination angle at reference time (semi-circles) [39], [49].

Scale factor 2^-32 semi-circles.

bdsOmegaDot

Parameter , Rate of right ascension (semi-circles/sec) [39], [49].

Scale factor 2^-44 semi-circles/second.

bdsI0Dot

Parameter i₀dot, Rate of inclination angle (semi-circles/sec) [39], [49].

Scale factor 2^-44 semi-circles/second.

bdsCuc

Parameter Cuc, Amplitude of cosine harmonic correction to the argument of latitude (radians) [39], [49].

Scale factor 2^-30 radians.

bdsCus

Parameter Cus, Amplitude of sine harmonic correction to the argument of latitude (radians) [39], [49].

Scale factor 2^-30 radians.

bdsCrc

Parameter Crc, Amplitude of cosine harmonic correction term to the orbit radius (metres) [39], [49].

Scale factor 2^-8 metres.

bdsCrs

Parameter Crs, Amplitude of sine harmonic correction term to the orbit radius (metres) [39], [49].

Scale factor 2^-8 metres.

bdsCic

Parameter Cic, Amplitude of cosine harmonic correction term to the angle of inclination (radians) [39], [49].

Scale factor 2^-30 radians.

bdsCis

Parameter Cis, Amplitude of sine harmonic correction term to the angle of inclination (radians) [39], [49].

Scale factor 2^-30 radians.

navic-Toe

Parameter toe, time-of-ephemeris in seconds [38].

Scale factor 2⁴ seconds.

navic-URAI

Parameter User Range Accuracy Index (in metres). This is a one-sigma estimate of the user range errors in the navigation data for the transmitting satellite as described under clause 6.2.1.4 in [38]

navic-W

Parameter ω, argument of perigee (semi-circles) [38].

Scale factor 2^-31 semi-circles.

navic-DeltaN

Parameter n, mean motion difference from computed value (semi-circles/sec) [38]

Scale factor 2^-41 semi-circles/second

navic-M0

Parameter M0, mean anomaly at reference time (semi-circles) [38]

Scale factor 2^-31 semi-circles.

navic-OmegaDot

Parameter OMEGAdot, rate of change of right ascension (semi-circles/sec) [38]

Scale factor 2^-41 semi-circles/second

navic-E

Parameter e, eccentricity [38]

Scale factor 2^-33.

navic-IDot

Parameter Idot, rate of change of inclination angle (semi-circles/sec) [38]

Scale factor 2^-43 semi-circles/second.

navic-APowerHalf

Parameter sqrtA, square root of semi-major Axis in (metres)^½ [38]

Scale factor 2^-19 metres ^½.

navic-I0

Parameter i0, inclination angle at reference time (semi-circles) [38]

Scale factor 2^-31 semi-circles.

navic-Omega0

Parameter OMEGA0, longitude of ascending node of orbit plane at weekly epoch (semi-circles) [38]

Scale factor 2^-31 semi-circles.

navic-Crs

Parameter Crs, amplitude of the sine harmonic correction term to the orbit radius (metres) [38]

Scale factor 2^-4 metres

navic-Cis

Parameter Cis, amplitude of the sine harmonic correction term to the angle of inclination (radians) [38]

Scale factor 2^-28 radians

navic-Cus

Parameter Cus, amplitude of the sine harmonic correction term to the argument of latitude (radians) [38]

Scale factor 2^-28 radians

navic-Crc

Parameter Crc, amplitude of the cosine harmonic correction term to the orbit radius (metres) [38]

Scale factor 2^-4 metres

navic-Cic

Parameter Cic, amplitude of the cosine harmonic correction term to the angle of inclination (radians) [38]

Scale factor 2^-28 radians

navic-Cuc

Parameter Cuc, amplitude of the cosine harmonic correction term to the argument of latitude (radians) [38]

Scale factor 2^-28 radians

gnss-BadSignalList

This field specifies a list of satellites with bad signal or signals.

badSVID

This field specifies the GNSS SV‑ID of the satellite with bad signal or signals.

badSignalID

This field identifies the bad signal or signals of a satellite. This is represented by a bit string in GNSS-SignalIDs, with a one‑value at a bit position means the particular GNSS signal type of the SV is unhealthy; a zero‑value means healthy. Absence of this field means that all signals on the specific SV are bad.

gnss-TOD

This field specifies the reference time of the first bit of the data in GNSS-DataBitAssistance in integer seconds in GNSS specific system time, modulo 1 hour.

Scale factor 1 second.

gnss-TODfrac

This field specifies the fractional part of the gnss-TOD in 1‑milli‑second resolution.

Scale factor 1 millisecond. The total GNSS TOD is gnss-TOD + gnss-TODfrac.

gnss-DataBitsSatList

This list specifies the data bits for a particular GNSS satellite SV-ID and signal GNSS-SignalID.

svID

This field specifies the GNSS SV‑ID of the satellite for which the GNSS-DataBitAssistance is given.

gnss-SignalType

This field identifies the GNSS signal type of the GNSS-DataBitAssistance.

gnss-DataBits

Data bits are contained in GNSS system and data type specific format.

In the case of GPS L1 C/A, it contains the NAV data modulation bits as defined in [4] .

In the case of Modernized GPS L1C, it contains the encoded and interleaved modulation symbols as defined in [6] clause 3.2.3.1. In the case of Modernized GPS L2C, it contains either the NAV data modulation bits, the FEC encoded NAV data modulation symbols, or the FEC encoded CNAV data modulation symbols, dependent on the current signal configuration of this satellite as defined in [4, Table 3-III]. In the case of Modernized GPS L5, it contains the FEC encoded CNAV data modulation symbols as defined in [5].

In the case of SBAS, it contains the FEC encoded data modulation symbols as defined in [10].

In the case of QZSS QZS-L1, it contains the NAV data modulation bits as defined in [7] clause 5.2. In the case of QZSS QZS-L1C, it contains the encoded and interleaved modulation symbols as defined in [7] clause 5.3. In the case of QZSS QZS-L2C, it contains the encoded modulation symbols as defined in [7] clause 5.5. In the case of QZSS QZS-L5, it contains the encoded modulation symbols as defined in [7] clause 5.6.

In the case of GLONASS, it contains the 100 sps differentially Manchester encoded modulation symbols as defined in [9] clause 3.3.2.2.

In the case of Galileo, it contains the FEC encoded and interleaved modulation symbols. The logical levels 1 and 0 correspond to signal levels -1 and +1, respectively.

In the case of BDS B1I, it contains the encoded and interleaved modulation symbols as defined in [23], clause 5.1.3.

In the case of BDS B1C, it contains the encoded and interleaved modulation symbols as defined in [39], clause 6.2.2.

In the case of BDS B2a, it contains the encoded and interleaved modulation symbols as defined in [49], clause 6.2.2.

In the case of BDS B3I, it contains the encoded and interleaved modulation symbols as defined in [50], clause 5.1.3.

In the case of NavIC, it contains the FEC encoded and interleaved Navigation symbols as defined in [38].

gnss-SignalID

This field specifies the GNSS signal for which the acquisition assistance are provided.

gnss-AcquisitionAssistList

These fields provide a list of acquisition assistance data for each GNSS satellite.

confidence

This field specifies the confidence level of the reference location area or volume used to calculate the acquisition assistance parameters (search windows). A high percentage value (e.g., 98% or more) indicates to the target device that the provided search windows are reliable. The location server should include this field to indicate the confidence level of the provided information.

svID

This field specifies the GNSS SV‑ID of the satellite for which the GNSS-AcquisitionAssistance is given.

doppler0

This field specifies the Doppler (0^th order term) value. A positive value in Doppler defines the increase in satellite signal frequency due to velocity towards the target device. A negative value in Doppler defines the decrease in satellite signal frequency due to velocity away from the target device. Doppler is given in unit of m/s by multiplying the Doppler value in Hz by the nominal wavelength of the assisted signal.

Scale factor 0.5 m/s in the range from -1024 m/s to +1023.5 m/s.

doppler1

This field specifies the Doppler (1^st order term) value. A positive value defines the rate of increase in satellite signal frequency due to acceleration towards the target device. A negative value defines the rate of decrease in satellite signal frequency due to acceleration away from the target device.

Scale factor 1/210 m/s² in the range from -0.2 m/s² to +0.1 m/s².

Actual value of Doppler (1^st order term) is calculated as (-42 + doppler1) * 1/210 m/s², with doppler1 in the range of 0…63.

dopplerUncertainty

This field specifies the Doppler uncertainty value. It is defined such that the Doppler experienced by a stationary target device is in the range [DopplerDoppler Uncertainty] to [DopplerDoppler Uncertainty]. Doppler Uncertainty is given in unit of m/s by multiplying the Doppler Uncertainty value in Hz by the nominal wavelength of the assisted signal.

Defined values: 2.5 m/s, 5 m/s, 10 m/s, 20 m/s, 40 m/s as encoded by an integer n in the range 0-4 according to:

2^-n(40) m/s; n = 0 – 4.

If the dopplerUncertaintyExt field is present, the target device that supports the dopplerUncertaintyExt shall ignore this field.

codePhase

This field together with the codePhase1023 field specifies the code phase, in units of milli‑seconds, in the range from 0 to 1 millisecond scaled by the nominal chipping rate of the GNSS signal, where increasing values of the field signify increasing predicted signal code phases, as seen by a receiver at the reference location at the reference time. The reference location would typically be an a priori estimate of the target device location.

Scale factor 2^-10 ms in the range from 0 to (1-2^-10) ms.

Note: The value (1-2^-10) ms is encoded using the codePhase1023 IE.

intCodePhase

This field contains integer code phase (expressed modulo 128 ms). The satellite integer milli-seconds code phase currently being transmitted at the reference time, as seen by a receiver at the reference location is calculated as reference time (expressed in milli-seconds) minus (intCodePhase + (n×128 ms)), as shown in Figure 6.5.2.2-1, with n = …-2,-1,0,1,2….

Scale factor 1 ms in the range from 0 to 127 ms.

codePhaseSearchWindow

This field contains the code phase search window. The code phase search window accounts for the uncertainty in the estimated target device location but not any uncertainty in reference time. It is defined such that the expected code phase is in the range [Code PhaseCode Phase Search Window] to [Code PhaseCode Phase Search Window] given in units of milli‑seconds.

Range 0-31, mapping according to the table codePhaseSearchWindow Value to Code Phase Search Window [ms] relation shown below.

azimuth

This field specifies the azimuth angle. An angle of x degrees means the satellite azimuth a is in the range

(x ≤ a < x+0.703125) degrees.

Scale factor 0.703125 degrees.

elevation

This field specifies the elevation angle. An angle of y degrees means the satellite elevation e is in the range

(y ≤ e < y+0.703125) degrees.

Scale factor 0.703125 degrees.

codePhase1023

This field if set to TRUE indicates that the code phase has the value 1023 × 2^-10 = (1-2^-10) ms. This field may only be set to TRUE if the value provided in the codePhase IE is 1022. If this field is set to FALSE, the code phase is the value provided in the codePhase IE in the range from 0 to (1 – 2×2^-10) ms. If this field is not present and the codePhase IE has the value 1022, the target device may assume that the code phase is between (1 – 2×2^-10) and (1 – 2^-10) ms.

dopplerUncertaintyExt

If this field is present, the target device that supports this field shall ignore the dopplerUncertainty field. The location server should include this field only if supported by the target device.

This field specifies the Doppler uncertainty value. It is defined such that the Doppler experienced by a stationary target device is in the range [DopplerDoppler Uncertainty] to [DopplerDoppler Uncertainty]. Doppler Uncertainty is given in unit of m/s by multiplying the Doppler Uncertainty value in Hz by the nominal wavelength of the assisted signal.

Enumerated values define 60 m/s, 80 m/s, 100 m/s, 120 m/s, and "No Information".

‘00000’

No information

‘00001’

0,002

‘00010’

0,004

‘00011’

0,008

‘00100’

0,012

‘00101’

0,016

‘00110’

0,024

‘00111’

0,032

‘01000’

0,048

‘01001’

0,064

‘01010’

0,096

‘01011’

0,128

‘01100’

0,164

‘01101’

0,200

‘01110’

0,250

‘01111’

0,300

‘10000’

0,360

‘10001’

0,420

‘10010’

0,480

‘10011’

0,540

‘10100’

0,600

‘10101’

0,660

‘10110’

0,720

‘10111’

0,780

‘11000’

0,850

‘11001’

1,000

‘11010’

1,150

‘11011’

1,300

‘11100’

1,450

‘11101’

1,600

‘11110’

1,800

‘11111’

2,000

weekNumber, weekNumber-ext

This field specifies the almanac reference week number in GNSS specific system time to which the almanac reference time toa is referenced, modulo 256 weeks. Either weekNumber or weekNumber-ext is required for non-GLONASS GNSSs.

In the case of Galileo, the almanac reference week number WN_a natively contains only the 2 LSB’s [8], clause 5.1.10].

In the case of BDS B1C and BDS B2a, the almanac reference week number is defined in [39], 7.9.1 and [49], 7.9.1.

In the case of NavIC, the almanac reference week number is defined in [38].

toa, toa-ext, toa-ext2

In the cases that GNSS-ID does not indicate Galileo or NavIC, this field specifies the almanac reference time given in GNSS specific system time, in units of seconds with a scale factor of 2¹². toa is required for non-GLONASS GNSSs when the toa-ext2 is not present.

In the case that GNSS-ID indicates Galileo, this field specifies the almanac reference time given in GNSS specific system time, in units of seconds with a scale factor of 600 seconds. Either toa or toa-ext is required for Galileo GNSS.

In the case that GNSS-ID indicates NavIC, this field specifies the almanac reference time given in GNSS specific system time, in units of seconds with a scale factor of 16 seconds [38]. Either toa or toa-ext2 is required for NavIC GNSS.

ioda, ioda-ext

This field specifies the issue of data. Either ioda or ioda-ext is required for Galileo GNSS.

completeAlmanacProvided

If set to TRUE, the gnss-AlmanacList contains almanacs for the complete GNSS constellation indicated by GNSS‑ID.

gnss-AlmanacList

This list contains the almanac model for each GNSS satellite in the GNSS constellation.

svID

This field identifies the satellite for which the GNSS Almanac Model is given.

kepAlmanacE

Parameter e, eccentricity, dimensionless [8].

Scale factor 2^-16.

kepAlmanacDeltaI

Parameter δi, inclination at reference time relative to i₀=56°; semi-circles [8].

Scale factor 2^-14 semi-circles.

kepAlmanacOmegaDot

Parameter , rate of change of right ascension (semi-circles/sec) [8].

Scale factor 2^-33 semi-circles/seconds.

kepSV-StatusINAV

This field contains the I/NAV signal health status [8], clause 5.1.10 , E5b_HS and E1-B_HS, where E5b_HS occupies the 2 MSBs in kepSV-StatusINAV, and E1-B_HS the two LSBs.

kepSV-StatusFNAV

This field contains the F/NAV signal health status [8], clause 5.1.10 ,E5a_HS. If the target device is supporting multiple Galileo signals, the location server shall include this field.

kepAlmanacAPowerHalf

Parameter (a^1/2), difference with respect to the square root of the nominal semi-major axis, (metres)1/2 [8].

Scale factor 2^-9 metres^½ .

kepAlmanacOmega0

Parameter OMEGA₀, longitude of ascending node of orbital plane at weekly epoch (semi-circles) [8].

Scale factor 2^-15 semi-circles.

kepAlmanacW

Parameter ω, argument of perigee (semi-circles) [8].

Scale factor 2^-15 semi-circles.

kepAlmanacM0

Parameter M₀, mean anomaly at reference time (semi-circles) [8].

Scale factor 2^-15 semi-circles.

kepAlmanacAF0

Parameter af₀, satellite clock correction bias, seconds [8].

Scale factor 2^-19 seconds.

kepAlmanacAF1

Parameter af₁, satellite clock correction linear, sec/sec [8].

Scale factor 2^-38 seconds/second.

svID

This field identifies the satellite for which the GNSS Almanac Model is given.

navAlmE

Parameter e, eccentricity, dimensionless [4,7].

Scale factor 2^-21.

navAlmDeltaI

Parameter δi, correction to inclination, semi-circles [4,7].

Scale factor 2^-19 semi-circles.

navAlmOMEGADOT

Parameter , rate of right ascension, semi-circles/sec [4,7].

Scale factor 2^-38 semi-circles/second.

navAlmSVHealth

Parameter SV Health, satellite health [4,7].

navAlmSqrtA

Parameter , square root of the semi-major axis, metres^/2 [4,7]

Scale factor 2^-11 metres^/2.

navAlmOMEGAo

Parameter ₀, longitude of ascending node of orbit plane at weekly epoch, semi-circles [4,7].

Scale factor 2^-23 semi-circles.

navAlmOmega

Parameter ω, argument of perigee semi-circles [4,7].

Scale factor 2^-23 semi-circles.

navAlmMo

Parameter M₀, mean anomaly at reference time semi-circles [4,7].

Scale factor 2^-23 semi-circles.

navAlmaf0

Parameter a_f0, apparent satellite clock correction seconds [4,7].

Scale factor 2^-20 seconds.

navAlmaf1

Parameter a_f1, apparent satellite clock correction sec/sec [4,7].

Scale factor 2^-38 semi-circles seconds/second.

svID

This field identifies the satellite for which the GNSS Almanac Model is given.

redAlmDeltaA

Parameter _A, metres [4], [5], [6], [7], [39], [49].

Scale factor 2⁺⁹ metres.

redAlmOmega0

Parameter ₀, semi-circles [4], [5], [6], [7], [39], [49].

Scale factor 2^-6 semi-circles.

redAlmPhi0

Parameter ₀, semi-circles [4], [5], [6], [7], [39], [49].

Scale factor 2^-6 semi-circles.

redAlmL1Health

Parameter L1 Health, dimensionless [4], [5], [6], [7].

If GNSS-ID = BDS, this field indicates the Satellite clock health state (the 8th bit) defined in table 7-14 [39] for BDS B1C and in table 7-14 [49] for BDS B2a.

redAlmL2Health

Parameter L2 Health, dimensionless [4], [5], [6], [7].

If GNSS-ID = BDS, this field indicates the B1C signal health state (the 7th bit) defined in table 7-14 [39] for BDS B1C and in table 7-14 [49] for BDS B2a.

redAlmL5Health

Parameter L5 Health, dimensionless [4], [5], [6], [7].

If GNSS-ID = BDS, this field indicates the B2a signal health state (the 6th bit) defined in table 7-14 [39] for BDS B1C and in table 7-14 [49] for BDS B2a.

svID

This field identifies the satellite for which the GNSS Almanac Model is given.

midiAlmE

Parameter e, dimensionless [4], [5], [6], [7], [39], [49].

Scale factor 2^-16.

midiAlmDeltaI

Parameter _i, semi-circles [4], [5], [6], [7], [39], [49].

Scale factor 2^-14 semi-circles.

midiAlmOmegaDot

Parameter , semi-circles/sec [4], [5], [6], [7], [39], [49].

Scale factor 2^-33 semi-circles/second.

midiAlmSqrtA

Parameter , metres^1/2 [4], [5], [6], [7], [39], [49].

Scale factor 2^-4 metres^1/2.

midiAlmOmega0

Parameter ₀, semi-circles [4], [5], [6], [7], [39], [49].

Scale factor 2^-15 semi-circles.

midiAlmOmega

Parameter , semi-circles [4], [5], [6], [7], [39], [49].

Scale factor 2^-15 semi-circles.

midiAlmMo

Parameter M₀, semi-circles [4], [5], [6], [7], [39, [49].

Scale factor 2^-15 semi-circles.

midiAlmaf0

Parameter a_fo, seconds [4], [5], [6], [7], [39], [49].

Scale factor 2^-20 seconds.

midiAlmaf1

Parameter a_f1, sec/sec [4], [5], [6], [7], [39], [49].

Scale factor 2^-37 seconds/second.

midiAlmL1Health

Parameter L1 Health, dimensionless [4], [5], [6], [7].

If GNSS-ID = BDS, this field indicates the satellite clock health state (the 8th bit) defined in table 7-14 [39] for BDS B1C and in table 7-14 [49] for BDS B2a.

midiAlmL2Health

Parameter L2 Health, dimensionless [4], [5], [6], [7].

If GNSS-ID = BDS, this field indicates the B1C signal health state (the 7th bit) defined in table 7-14 [39] for BDS B1C and in table 7-14 [49] for BDS B2a.

midiAlmL5Health

Parameter L5 Health, dimensionless [4], [5], [6], [7].

If GNSS-ID = BDS, this field indicates the B2a signal health state (the 6th bit) defined in table 7-14 [39] for BDS B1C and in table 7-14 [49] for BDS B2a.

gloAlm-NA

Parameter N^A, days [9].

Scale factor 1 days.

gloAlmnA

Parameter n^A, dimensionless [9].

gloAlmHA

Parameter H_n^A, dimensionless [9].

gloAlmLambdaA

Parameter _n^A, semi-circles [9].

Scale factor 2^-20 semi-circles.

gloAlmtlambdaA

Parameter t_n^A, seconds [9].

Scale factor 2^-5 seconds.

gloAlmDeltaIa

Parameter i_n^A, semi-circles [9].

Scale factor 2^-20 semi-circles.

gloAlmDeltaTA

Parameter T_n^A, sec/orbit period [9].

Scale factor 2^-9 seconds/orbit period.

gloAlmDeltaTdotA

Parameter T_DOT_n^A, sec/orbit period² [9].

Scale factor 2^-14 seconds/orbit period².

gloAlmEpsilonA

Parameter _n^A, dimensionless [9].

Scale factor 2^-20.

gloAlmOmegaA

Parameter _n^A, semi-circles [9].

Scale factor 2^-15 semi-circles.

gloAlmTauA

Parameter _n^A, seconds [9].

Scale factor 2^-18 seconds.

gloAlmCA

Parameter C_n^A, dimensionless [9].

gloAlmMA

Parameter M_n^A, dimensionless [9]. This parameter is present if its value is nonzero; otherwise it is not present.

sbasAlmDataID

Parameter Data ID, dimensionless [10].

svID

This field identifies the satellite for which the GNSS Almanac Model is given.

sbasAlmHealth

Parameter Health, dimensionless [10].

sbasAlmXg

Parameter X_G, metres [10].

Scale factor 2600 metres.

sbasAlmYg

Parameter Y_G, metres [10].

Scale factor 2600 metres.

sbasAlmZg

Parameter Z_G, metres [10].

Scale factor 26000 metres.

sbasAlmXgdot

Parameter X_G Rat-of-Change, metres/second [10].

Scale factor 10 metres/second.

sbasAlmYgDot

Parameter Y_G Rate-of-Change, metres/second [10].

Scale factor 10 metres/second.

sbasAlmZgDot

Parameter Z_G Rate-of-Change, metres/second [10].

Scale factor 40.96 metres/second.

sbasAlmTo

Parameter t₀, seconds [10].

Scale factor 64 metres/second.

NotSameForAllSV

This field may be present if the t_oa is not the same for all SVs; otherwise it is not present and the t_oa is provided in GNSS-Almanac.

SV-ID

This field is mandatory present if SV-ID is between 0 and 63; otherwise it is not present.

svID

This field identifies the satellite for which the GNSS Almanac Model is given.

bdsAlmToa

Parameter t_oa, Almanac reference time (seconds) [23], [50].

Scale factor 2¹² seconds.

bdsAlmSqrtA

Parameter A^1/2, Square root of semi-major axis (metres^1/2) [23], [50].

Scale factor 2^-11 metres^1/2.

bdsAlmE

Parameter e, Eccentricity, dimensionless [23], [50].

Scale factor 2^-21.

bdsAlmW

Parameter , Argument of Perigee (semi-circles) [23], [50].

Scale factor 2^-23 semi-circles.

bdsAlmM0

Parameter M_0, Mean anomaly at reference time (semi-circles) [23], [50].

Scale factor 2^-23 semi-circles.

bdsAlmOmega0

Parameter _0, Longitude of ascending node of orbital plane computed according to reference time (semi-circles) [23], [50].

Scale factor 2^-23 semi-circles.

bdsAlmOmegaDot

Parameter  Rate of right ascension (semi-circles/second) [23], [50].

Scale factor 2^-38 semi-circles/second.

bdsAlmDeltaI

Parameter _i, Correction of orbit reference inclination at reference time (semi-circles) [23], [50].

Scale factor 2^-19 semi-circles.

bdsAlmA0

Parameter a₀, Satellite clock bias (seconds) [23], [50].

Scale factor 2^-20 seconds.

bdsAlmA1

Parameter a₁, Satellite clock rate (sec/sec) [23], [50].

Scale factor 2^-38 seconds/seconds.

bdsSvHealth

This field indicates satellites health information as defined in [23], [50] Table 5-16. The left most bit is the MSB.

NotSameForAllSV

This field is optionally present, need ON, if the t_oa is not the same for all SVs; otherwise it is not present and the t_oa is provided in GNSS-Almanac.

svID

This field identifies the satellite for which the Almanac model is given

navic-AlmToa

This field provides the time of almanac set

Scale factor 16 seconds.

navic-AlmE

Parameter e, eccentricity, dimensionless

Scale factor 2^-21.

navic-AlmOMEGADOT

Parameter , rate of right ascension, semi-circles/sec

Scale factor 2^-38 semi-circles/second

navic-AlmSqrtA

Parameter , square root of the semi-major axis, metres^1/2

Scale factor 2^-11 metres^1/2.

navic-AlmOMEGAo

Parameter ₀, longitude of ascending node of orbit plane at weekly epoch, semi-circles

Scale factor 2^-23 semi-circles.

navic-AlmOmega

Parameter ω, argument of perigee semi-circles

Scale factor 2^-23 semi-circles.

navic-AlmMo

Parameter M₀, mean anomaly at reference time semi-circles

Scale factor 2^-23 semi-circles.

navic-Almaf0

Parameter a_f0, apparent satellite clock correction seconds

Scale factor 2^-20 seconds.

navic-Almaf1

Parameter a_f1, apparent satellite clock correction sec/sec

Scale factor 2^-38 semi-circles seconds/second.

gnss-Utc-A1

Parameter A₁, scale factor 2^-50 seconds/second [4,7,8].

gnss-Utc-A0

Parameter A₀, scale factor 2^-30 seconds [4,7,8].

gnss-Utc-Tot

Parameter t_ot, scale factor 2¹² seconds [4,7,8].

gnss-Utc-WNt

Parameter WN_t, scale factor 1 week [4,7,8].

gnss-Utc-DeltaTls

Parameter Δt_LS, scale factor 1 second [4,7,8].

gnss-Utc-WNlsf

Parameter WN_LSF, scale factor 1 week [4,7,8].

gnss-Utc-DN

Parameter DN, scale factor 1 day [4,7,8].

gnss-Utc-DeltaTlsf

Parameter Δt_LSF, scale factor 1 second [4,7,8].

utcA0

Parameter A_0-n, bias coefficient of GNSS time scale relative to UTC time scale (seconds) [4], [5], [6], [7], [38], [39], [49].

Scale factor 2^-35 seconds.

utcA1

Parameter A_1-n, drift coefficient of GNSS time scale relative to UTC time scale (sec/sec) [4], [5], [6], [7], [38], [39], [49].

Scale factor 2^-51 seconds/second.

utcA2

Parameter A_2-n, drift rate correction coefficient of GNSS time scale relative to UTC time scale (sec/sec²) [4], [5], [6], [7], [38], [39], [49].

Scale factor 2^-68 seconds/second².

utcDeltaTls

Parameter Δt_LS, current or past leap second count (seconds) [4], [5], [6], [7], [38], [39], [49].

Scale factor 1 second.

utcTot

Parameter t_ot, time data reference time of week (seconds) [4], [5], [6], [7], [38], [39], [49].

Scale factor 2⁴ seconds.

utcWNot

Parameter WN_ot, time data reference week number (weeks) [4], [5], [6], [7], [38], [39], [49].

Scale factor 1 week.

utcWNlsf, utcWNlsf-ext

Parameter WN_LSF, leap second reference week number (weeks) [4], [5], [6], [7], [38], [39], [49].

If the field utcWNlsf-ext is present, the field utcWNlsf shall be ignored by the receiver.

Scale factor 1 week.

utcDN

Parameter DN, leap second reference day number (days) [4], [5], [6], [7], [38], [39], [49].

Scale factor 1 day.

utcDeltaTlsf

Parameter Δt_LSF, current or future leap second count (seconds) [4], [5], [6], [7], [38], [39], [49].

Scale factor 1 second.

GLONASS-M

The field is mandatory present if GLONASS-M satellites are present in the current GLONASS constellation; otherwise it is not present.

nA

Parameter N^A, calendar day number within four-year period beginning since the leap year (days) [9].

Scale factor 1 day.

tauC

Parameter _c, GLONASS time scale correction to UTC(SU) (seconds) [9].

Scale factor 2^-31 seconds.

b1

Parameter B1, coefficient to determine UT1 (seconds) [9].

Scale factor 2^-10 seconds.

b2

Parameter B2, coefficient to determine UT1 (seconds/msd) [9].

Scale factor 2^-16 seconds/msd.

kp

Parameter KP, notification of expected leap second correction (dimensionless) [9].

utcA1wnt

Parameter A_1WNT, sec/sec ([10], Message Type 12).

Scale factor 2^-50 seconds/second.

utcA0wnt

Parameter A_0WNT, seconds ([10], Message Type 12).

Scale factor 2^-30 seconds.

utcTot

Parameter t_ot, seconds ([10], Message Type 12).

Scale factor 2¹² seconds.

utcWNt

Parameter WN_t, weeks ([10], Message Type 12).

Scale factor 1 week.

utcDeltaTls

Parameter Δt_LS, seconds ([10], Message Type 12).

Scale factor 1 second.

utcWNlsf

Parameter WN_LSF, weeks ([10], Message Type 12).

Scale factor 1 week.

utcDN

Parameter DN, days ([10], Message Type 12).

Scale factor 1 day.

utcDeltaTlsf

Parameter Δt_LSF, seconds ([10], Message Type 12).

Scale factor 1 second.

utcStandardID

If GNSS-ID indicates ‘sbas’, this field indicates the UTC standard used for the SBAS network time indicated by SBAS‑ID to UTC relation as defined in the table Value of UTC Standard ID to UTC Standard relation shown below ([10], Message Type 12).

0

UTC as operated by the Communications Research Laboratory (CRL), Tokyo, Japan

1

UTC as operated by the National Institute of Standards and Technology (NIST)

2

UTC as operated by the U. S. Naval Observatory (USNO)

3

UTC as operated by the International Bureau of Weights and Measures (BIPM)

4-7

Reserved for future definition

utcA0

Parameter A_0UTC, BDS clock bias relative to UTC, seconds [23].

Scale factor 2^-30 seconds.

utcA1

Parameter A_1UTC, BDS clock rate relative to UTC, sec/sec [23].

Scale factor 2^-50 sec/sec.

utcDeltaTls

Parameter Δt_LS, delta time due to leap seconds before the new leap second effective, seconds [23].

Scale factor 1 second.

utcWNlsf

Parameter WN_LSF, week number of the new leap second, weeks [23].

Scale factor 1 week.

utcDN

Parameter DN, day number of week of the new leap second, days [23].

Scale factor 1 day.

utcDeltaTlsf

Parameter Δt_LSF, delta time due to leap seconds after the new leap second effective, seconds [23].

Scale factor 1 second.

FDMA

The field is mandatory present if the GLONASS SV indicated by svID broadcasts FDMA signals; otherwise it is not present.

gnss-ID-GPS

This choice may only be present if GNSS-ID indicates GPS.

gnss-ID-GLONASS

This choice may only be present if GNSS-ID indicates GLONASS.

gnss-ID-BDS

This choice may only be present if GNSS-ID indicates BDS.

svID

This field specifies the GNSS SV for which the GNSS-AuxiliaryInformation is given.

signalsAvailable

This field indicates the ranging signals supported by the satellite indicated by svID. This field is given as a bit string as defined in GNSS-SignalIDs for a particular GNSS. If a bit is set to ‘1’ it indicates that the satellite identified by svID transmits ranging signals according to the signal correspondence in GNSS-SignalIDs. If a bit is set to ‘0’ it indicates that the corresponding signal is not supported on the satellite identified by svID.

channelNumber

This field indicates the GLONASS carrier frequency number of the satellite identified by svID, as defined in [9].

satType

This field identifies the BDS B1C and BDS B2a Satellite orbit type, defined in [39], [49].

1 indicates the GEO satellite, 2 indicates the IGSO satellite, 3 indicates the MEO satellite, and 0 is reserved.

dbds-RefTime

This field specifies the time for which the differential corrections are valid, modulo 1 hour. dbds-RefTime is given in BDS system time.

Scale factor 1‑second.

bds-UDREI

This field indicates user differential range error information by user differential range error index (UDREI) as defined in [23], [50], clause 5.3.3.8.2.

bds-RURAI

This field indicates Regional User Range Accuracy (RURA) information by Regional User Range Accuracy Index (UDREI) as defined in [23], [50], clause 5.3.3.7.

bds-ECC–DeltaT

This field indicates the BDS differential correction information which is expressed in equivalent clock correction (t). Add the value of t to the observed pseudo-range to correct the effect caused by the satellite clock offset and ephemeris error. Value -4096 means the t is not available.

The scale factor is 0.1 metre.

igp-ID

This field indicates the ionospheric grid point (IGP) number as defined in [23], [50], clause 5.3.3.9.

dt

This field indicates d_T as defined in [23], [50], clause 5.3.3.9.1, i.e. the vertical delay at the corresponding IGP indicated by igp-ID.

The scale factor is 0.125 metre.

givei

This field indicates the Grid Ionospheric Vertical Error Index (GIVEI) which is used to describe the delay correction accuracy at ionospheric grid point indicated by igp-ID, the mapping between GIVEI and GIVE is defined in [23], [50], clause 5.3.3.9.2.

epochTime

This field specifies the epoch time of the observations. The gnss-TimeID in GNSS SystemTime shall be the same as the GNSS-ID in IE GNSS-GenericAssistDataElement.

svID

This field specifies the GNSS SV‑ID of the satellite for which the GNSS Observations are provided.

integer-ms

This field contains the integer number of milliseconds in the satellite rough range. Rough range can be used to restore complete observables for a given satellite.

Scale factor 1 milli-second in the range from 0 to 254 milli-seconds.

rough-range

This field contains the sub-milliseconds in the satellite rough range (modulo 1 millisecond).

Scale factor 2^-10 milli-seconds in the range from 0 to (1-2^-10) milli-seconds.

rough-phase-range-rate

This field contains the GNSS satellite rough phaserange rate.

Scale factor 1 m/s. Range ±8191 m/s.

gnss-SignalID

This field specifies the GNSS signal for which the GNSS observations are provided.

fine-PseudoRange

This field contains the GNSS signal fine pseudorange.

Full pseudorange corresponding to the given signal is the sum of this field and the fields integer-ms and rough-range. NOTE 1.

Scale factor 2^–29 milli-seconds. Range ±(2^–10–2^–29) milli-seconds.

fine-PhaseRange

This field contains the GNSS signal fine phaserange.

Being added to fields integer-ms and rough-range allows getting the full phaserange observable corresponding to given signal. NOTE 2.

Scale factor 2^–31 milli-seconds. Range ±(2^–8–2^–31) milli-seconds.

lockTimeIndicator

This field provides a measure of the amount of time during which the receiver has maintained continuous lock on that satellite signal. If a cycle slip occurs during the previous measurement cycle, the lock time indicator shall be reset to zero.

The mapping of lock-time parameters as defined in [30] is according to the table lockTimeIndicator value to lock-time parameters relation shown below.

halfCycleAmbiguityIndicator

Value 0 indicates no half-cycle ambiguity. Value 1 indicates half-cycle ambiguity.

When providing phaserange with unresolved polarity encoding this bit shall be set to 1. A target device that is not capable of handling half-cycle ambiguities shall skip such phaserange observables. If polarity resolution forced phaserange to be corrected by half-a-cycle, then the lockTimeIndicator must be reset to zero, indicating that despite continuous tracking the final phaserange experienced non-continuity.

carrier-to-noise-ratio

This field provides the GNSS signal carrier-to-noise-ratio in dB-Hz.

Scale factor 2^–4 dB-Hz in the range from 0.0625 to 63.9375 dB-Hz.

fine-PhaseRangeRate

This field contains the GNSS signal fine Phase Range Rate.

Full phaserange rate is the sum of this field and the rough-phase-range-rate field. NOTE 3.

Scale factor 0.0001 m/s. Range ±1.6383 m/s.

0 – 63

1

i

0 ≤ t < 64

64 – 95

2

2 × i – 64

64 ≤ t < 128

96 – 127

4

4 × i – 256

128 ≤ t < 256

128 – 159

8

8 × i – 768

256 ≤ t < 512

160 – 191

16

16 × i – 2048

512 ≤ t < 1024

192 – 223

32

32 × i – 5120

1024 ≤ t < 2048

224 – 255

64

64 × i – 12288

2048 ≤ t < 4096

256 – 287

128

128 × i – 28672

4096 ≤ t < 8192

288 – 319

256

256 × i – 65536

8192 ≤ t < 16384

320 – 351

512

512 × i – 147456

16384 ≤ t < 32768

352 – 383

1024

1024 × i – 327680

32768 ≤ t < 65536

384 – 415

2048

2048 × i – 720896

65536 ≤ t < 131072

416 – 447

4096

4096 × i – 1572864

131072 ≤ t < 262144

448 – 479

8192

8192 × i – 3407872

262144 ≤ t < 524288

480 – 511

16384

16384 × i – 7340032

524288 ≤ t < 1048576

512 – 543

32768

32768 × i – 15728640

1048576 ≤ t < 2097152

544 – 575

65536

65536 × i – 33554432

2097152 ≤ t < 4194304

576 – 607

131072

131072 × i – 71303168

4194304 ≤ t < 8388608

608 – 639

262144

262144 × i – 150994944

8388608 ≤ t < 16777216

640 – 671

524288

524288 × i – 318767104

16777216 ≤ t < 33554432

672 – 703

1048576

1048576 × i – 671088640

33554432 ≤ t < 67108864

704

2097152

2097152 × i – 1409286144

67108864 ≤ t

705 – 1023

Reserved

referenceStationID

This field specifies the Station ID for which the GLO-RTK-BiasInformation is provided.

cpbIndicator

This field specifies the GLONASS Code-Phase Bias Indicator. The interpretation of the value is as follows:

0 – The GLONASS Pseudorange and Phaserange observations in IE GNSS-RTK-Observations are not aligned to the same measurement epoch.

1 – The GLONASS Pseudorange and Phaserange observations in IE GNSS-RTK-Observations are aligned to the same measurement epoch.

l1-ca-cpBias

This field specifies the GLONASS L1 C/A Code-Phase Bias, which represents the offset between the L1 C/A Pseudorange and L1 Phaserange measurement epochs in metres.

If cpbIndicator is set to 0, the measurement epoch of the GLONASS L1 Phaserange measurements may be aligned using:

Aligned GLONASS L1 Phaserange = Full GLONASS L1 Phaserange + GLONASS L1 C/A Code-Phase Bias.

If cpbIndicator is set to 1, the measurement epoch of the GLONASS L1 Phaserange measurements may be unaligned using:

Unaligned GLONASS L1 Phaserange = Full GLONASS L1 Phaserange – GLONASS L1 C/A Code-Phase Bias.

Scale factor 0.02 m. Range ±655.34 m.

l1-p-cpBias

This field specifies the GLONASS L1 P Code-Phase Bias, which represents the offset between the L1 P Pseudorange and L1 Phaserange measurement epochs in metres.

If cpbIndicator is set to 0, the measurement epoch of the GLONASS L1 Phaserange measurements may be aligned using:

Aligned GLONASS L1 Phaserange = Full GLONASS L1 Phaserange + GLONASS L1 P Code-Phase Bias.

If cpbIndicator is set to 1, the measurement epoch of the GLONASS L1 Phaserange measurements may be unaligned using:

Unaligned GLONASS L1 Phaserange = Full GLONASS L1 Phaserange – GLONASS L1 P Code-Phase Bias.

Scale factor 0.02 m. Range ±655.34 m.

l2-ca-cpBias

This field specifies the GLONASS L2 C/A Code-Phase Bias, which represents the offset between the L2 C/A Pseudorange and L2 Phaserange measurement epochs in metres.

If cpbIndicator is set to 0, the measurement epoch of the GLONASS L2 Phaserange measurements may be aligned using:

Aligned GLONASS L2 Phaserange = Full GLONASS L2 Phaserange + GLONASS L2 C/A Code-Phase Bias.

If cpbIndicator is set to 1, the measurement epoch of the GLONASS L2 Phaserange measurements may be unaligned using:

Unaligned GLONASS L2 Phaserange = Full GLONASS L2 Phaserange – GLONASS L2 C/A Code-Phase Bias.

Scale factor 0.02 m. Range ±655.34 m.

l2-p-cpBias

This field specifies the GLONASS L2 P Code-Phase Bias, which represents the offset between the L2 P Pseudorange and L2 Phaserange measurement epochs in metres.

If cpbIndicator is set to 0, the measurement epoch of the GLONASS L2 Phaserange measurements may be aligned using:

Aligned GLONASS L2 Phaserange = Full GLONASS L2 Phaserange + GLONASS L2 P Code-Phase Bias.

If cpbIndicator is set to 1, the measurement epoch of the GLONASS L2 Phaserange measurements may be unaligned using:

Unaligned GLONASS L2 Phaserange = Full GLONASS L2 Phaserange – GLONASS L2 P Code-Phase Bias.

Scale factor 0.02 m. Range ±655.34 m.

networkID

This field provides the network ID.

subNetworkID

This field identifies the subnetwork of a network identified by networkID.

master-ReferenceStationID

This field specifies the station ID of the Master Reference Station.

l1, l2

These fields specify the dual-frequency combination of L1 and L2 link/frequencies for which the rtkCorrectionDifferencesList is provided. If the fields are absent, the default interpretation in table ‘L1/L2 default interpretation’ applies.

rtkCorrectionDifferencesList

This field provides the correction differences for Auxiliary-Master Reference Station pairs.

epochTime

This field specifies the epoch time of observations used to derive the correction differences. The gnss-TimeID in GNSS‑SystemTime shall be the same as the GNSS-ID in IE GNSS-GenericAssistDataElement.

auxiliary-referenceStationID

This field specifies the station ID of the Auxiliary Reference Station.

svID

This field specifies the satellite for which the data is provided.

ambiguityStatusFlag

This field provides the ambiguity status. ‘L1’ below corresponds to the link indicated by the l1 field; ‘L2’ below corresponds to the link indicated by the l2 field.

0 – Reserved for future use (artificial observations)

1 – Correct Integer Ambiguity Level for L1 and L2

2 – Correct Integer Ambiguity Level for L1-L2 widelane

3 – Uncertain Integer Ambiguity Level. Only a likely guess is used.

non-synch-count

This field provides the count of unrecoverable cycle slips. Whenever an unrecoverable cycle slip occurs this count shall be increased. The counter shall not be increased more than once per minute. Data for satellites with cycle slips more frequent than once per minute should not be provided.

geometricCarrierPhaseCorrectionDifference

This field provides the Geometric Carrier Phase Correction Difference (GCPCD), which is the Correction Difference for the geometric part (troposphere and orbits) calculated based on integer leveled L1 and L2 correction differences (L1CD and L2CD).

L1CD, L2CD, and ICPCD are presented in metres. ‘L1’ below corresponds to the link indicated by the l1 field; ‘L2’ below corresponds to the link indicated by the l2 field.

Scale factor 0.5 millimetre; range ±32.767 metres.

iod

This field specifies the IOD value of the broadcast ephemeris used for calculation of Correction Differences (see IE GNSS-NavigationModel).

ionosphericCarrierPhaseCorrectionDifference

This field provides the Ionospheric Carrier Phase Correction Difference (ICPCD), which is the Correction Difference for the ionospheric part calculated based on integer leveled L1 and L2 correction differences (L1CD and L2CD).

L1CD, L2CD, and ICPCD are presented in metres. ‘L1’ below corresponds to the link indicated by the l1 field; ‘L2’ below corresponds to the link indicated by the l2 field.

Scale factor 0.5 millimetre; range ±32.767 metres.

GPS

L1

L2

SBAS

L1

L5

QZSS

L1

L2

Galileo

E1

E5a

GLONASS

G1

G2

BDS

B1

B2

epochTime

This field specifies the epoch time of the Network RTK Residual Error data. The gnss-TimeID in GNSS‑SystemTime shall be the same as the GNSS-ID in IE GNSS-GenericAssistDataElement.

referenceStationID

This field specifies the Reference Station ID. The Reference Station may be a physical or non-physical station.

n-Refs

This field specifies the number of reference stations used to derive the residual statistics (1 to 127; 127 indicates 127 or more stations). The number of reference stations should never be zero. If zero is encountered the target device should ignore the message.

l1, l2

These fields specify the dual-frequency combination of L1 and L2 link/frequencies for which the rtk residuals-list is provided. If the fields are absent, the default interpretation in table ‘L1/L2 default interpretation’ in IE GNSS‑RTK‑MAC‑CorrectionDifferences applies.

svID