Novatel OM-20000053 Rev 2 GPALM Almanac Data

D Logs Summary
MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2 161
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]
1 Variable 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
2 Reference paragraph 20.3.3.5.1.3, Table 20-VII and Table 20-VIII, ICD-GPS-200, Rev. B
3 Reference Table 20-VI, ICD-GPS-200, Rev. B for scaling factors and units.
To obtain copies of ICD-GPS-200, see Appendix F, Standards and References, Page 239, 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
4PRN Satellite PRN number, 01 to 32 xx 28
5GPS wk GPS reference week number 1x.x 653
6SV hlth SV health, bits 17-24 of each almanac page 2hh 00
7ecc e, eccentricity 3hhhh 3EAF
8alm ref time toa, almanac reference time 3hh 87
9incl angle (sigma)i, inclination angle 3hhhh OD68
10 omegadot OMEGADOT, rate of right ascension 3hhhh FD30
11 rt axis (A)1/2, root of semi-major axis 3hhhhhh A10CAB
12 omega omega, argument of perigee 3hhhhhh 6EE732
13 long asc node (OMEGA)o,longitude of ascension node 3hhhhhh 525880
14 MoMo, mean anomaly 3hhhhhh 6DC5A8
15 af0 af0, clock parameter 3hhh 009
16 af1 af1, clock parameter 3hhh 005
17 *xx Checksum *hh *37
18 [CR][LF] Sentence terminator [CR][LF]