D Logs summary
136 MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
D LOGS SUMMARY

LOG DESCRIPTIONS

ALMA/B Decoded Almanac

This log contains the decoded almanac parameters from subframes four and five as received from the satellite with
the parity information removed and appropriate scaling applied. Multiple messages are transmitted, one for each
SV almanac collected. The Ionospheric Model parameters (IONA) and the UTC Time parameters (UTCA) are also
provided, following the last almanac records. For more information on Almanac data, refer to the GPS SPS Signal
Specification. (See Appendix F of this manual for References.)
MiLLennium cards will automatically save almanacs in their non-volatile memory (NVM), therefore creating an
almanac boot file would not be necessary.
ALMA
Structure:
ALMA FORMAT
$ALMA prn ecc seconds week rate-ra
ra wMoaf0 af1 cor-mean-motion
Aincl-angle health-4 health-5 health-alm *xx [CR][LF]
Field # Field type Data Description Example
1$ALMA Log header $ALMA
2prn Satellite PRN number for current message, dimensionless 1
3ecc Eccentricity, dimensionless 3.55577E-003
4seconds Almanac reference time, seconds into the week 32768
5week Almanac reference week (GPS week number) 745
6rate-ra Rate of right ascension, radians -7.8860E-009
7ra Right ascension, radians -6.0052951E-002
8 w Argument of perigee, radians -1.1824254E+000
9 MoMean anomaly, radians 1.67892137E+000
10 af0 Clock aging parameter, seconds -1.8119E-005
11 af1 Clock aging parameter, seconds/second -3.6379E-012
12 cor-mean-motion Corrected mean motion, radians/second 1.45854965 E-004
13 ASemi-major axis, metres 2.65602281E+007
14 incl-angle Angle of inclination, radians 9.55576E-001
15 health-4 Anti-spoofing and SV config (subframe 4, page 25) 1
16 health-5 SV health, 6 bits/SV (subframe 4 or 5, page 25) 0
17 health-alm SV health, 8 bits (almanac) 0
18 *xx Checksum *20
19 [CR][LF] Sentence terminator [CR][LF]
1 - 19 $ALMA Next satellite PRN almanac message
1 - 19 $ALMA Last satellite PRN almanac message
1 - 11 $IONA Ionospheric Model Parameters
1 - 11 $UTCA UTC Time Parameters
DLOGS SUMMARY