u-blox ZED-F9P Interface Description - Manual
Advance Information
5.12.5.2 UBX-MGA-GLO-ALM
Message
UBX-MGA-GLO-ALM
Description
GLONASS Almanac Assistance
Firmware
Supported on:
• u-blox 9 with protocol version 27
Type
Input
Comment
This message allows the delivery of GLONASS almanac assistance to a receiver. See the
description of AssistNow Online for details.
Header Class ID Length (Bytes) Payload Checksum
Message Structure
0xB5 0x62 0x13 0x06 36
see below
CK_A CK_B
Payload Contents:
Byte Offset Number
Format
Scaling Name Unit Description
0 U1 - type - Message type (0x02 for this type)
1 U1 - version - Message version (0x00 for this version)
2 U1 - svId - GLONASS Satellite identifier (see Satellite
Numbering)
3 U1 - reserved1 - Reserved
4 U2 - N days Reference calender day number of almanac
within the four-year period (from string 5)
6 U1 - M - Type of GLONASS satellite (1 indicates
GLONASS-M)
7 U1 - C - Unhealthy flag at instant of almanac upload (1
indicates operability of satellite)
8 I2 2^-18 tau s Coarse time correction to GLONASS time
10 U2 2^-20 epsilon - Eccentricity
12 I4 2^-20 lambda semi-
circles
Longitude of the first (within the N-day)
ascending node of satellite orbit in PC-90.02
coordinate system
16 I4 2^-20 deltaI semi-
circles
Correction to the mean value of inclination
20 U4 2^-5 tLambda s Time of the first ascending node passage
24 I4 2^-9 deltaT s/orbital-
period
Correction to the mean value of Draconian
period
28 I1 2^-14 deltaDT s/orbital-
period^
2
Rate of change of Draconian period
29 I1 - H - Carrier frequency number of navigation RF
signal, Range=(-7 .. 6)
30 I2 - omega - Argument of perigee
32 U1[4] - reserved2 - Reserved
UBX-18010854 - R04 Advance Information Page 112 of 259
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