Novatel Software Version 4.45 OM-20000026 Rev 1 GPALM Almanac Data

D Logs summary
142 MiLLennium Command Descriptions Manual
GPALM Almanac Data
This log outputs raw almanac data for each satellite PRN contained in the broadcast message. A separate record is
logged for each PRN, up to a maximum of 32 records. Following a GPSCard reboot, no records will be output until
new broadcast message data is received from a satellite. It takes a minimum of 12.5 minutes to collect a complete
almanac following GPSCard boot-up. (The almanac reported here has no relationship to the NovAtel $ALMA
almanac injection command. Following a cold start, the log will output null fields until a new almanac is collected
from a satellite.)
Structure:
Example:
$GPALM,17,17,28,653,00,3EAF,87,0D68,FD30,A10CAB,6EE732,525880,6DC5A8,009,
005*37[CR][LF]
➀Variable length integer, 4-digits maximum from (2) most significant binary bits of Subframe 1, Word 3
reference Table 20-I, ICD-GPS-200, Rev. B, and (8) least significant bits from subframe 5, page 25, word 3
reference Table 20-I, ICD-GPS-200, Rev. B, paragraph 20.3.3.5.1.7
➁ Reference paragraph 20.3.3.5.1.3, Table 20-VII and Table 20-VIII, ICD-GPS-200, Rev. B
➂ Reference Table 20-VI, ICD-GPS-200, Rev. B for scalingfactors and units.
To obtain copies of ICD-GPS-200, see Appendix F, Standards and References, for address information.
$GPALM # msg msg # PRN GPS wk SV hlth ecc
alm ref time incl angle omegadot rt axis
omega long asc node Moaf1 *xx [CR][LF]
Field Structure Field Description Symbol Exam-
ple
1$GPALM Log header $GPALM
2# msg Total number of messages logged x.x 17
3msg # Current message number x.x 17
4 PRN Satellite PRN number, 01 to 32 xx 28
5GPS wk GPS reference week number ➀x.x 653
6SV hlth SV health, bits 17-24 of each almanac page ➁hh 00
7ecc e, eccentricity ➂hhhh 3EAF
8alm ref time toa, almanac reference time ➂hh 87
9incl angle (sigma)i, inclination angle ➂hhhh OD68
10 omegadot OMEGADOT, rate of right ascension ➂hhhh FD30
11 rt axis (A)1/2, root of semi-major axis ➂hhhhhh A10CAB
12 omega omega, argument of perigee ➂hhhhhh 6EE732
13 long asc node (OMEGA)o,longitude of ascension node ➂hhhhhh 525880
14 MoMo, mean anomaly ➂hhhhhh 6DC5A8
15 af0 af0, clock parameter ➂hhh 009
16 af1 af1, clock parameter ➂hhh 005
17 *xx Checksum *hh *37
18 [CR][LF] Sentence terminator [CR][LF]