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
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
3
U1
-
reserved1
-
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
-
UBX-18010854 - R04
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Page 112 of 259
