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D Logs Summary
138 MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2
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
w
M
o
a
f0
a
f1
cor-mean-motion
A incl-angle health-4 health-5 health-alm *xx [CR][LF]
Field # Field type Data Description Example
1 $ALMA Log header $ALMA
2 prn Satellite PRN number for current message, dimensionless 1
3 ecc Eccentricity, dimensionless 3.55577E-003
4 seconds Almanac reference time, seconds into the week 32768
5 week Almanac reference week (GPS week number) 745
6 rate-ra Rate of right ascension, radians -7.8860E-009
7 ra Right ascension, radians -6.0052951E-002
8 w Argument of perigee, radians -1.1824254E+000
9 M
o
Mean anomaly, radians 1.67892137E+000
10
a
f0
Clock aging parameter, seconds -1.8119E-005
11
a
f1
Clock aging parameter, seconds/second -3.6379E-012
12 cor-mean-motion Corrected mean motion, radians/second 1.45854965E-004
13 A Semi-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
D LOGS SUMMARY
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