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D Logs summary
MiLLennium Command Descriptions Manual 175
REPA/B Raw Ephemeris
REPA
This log contains the raw Binary information for subframes one, two and three from the satellite with the parity
information removed. Each subframe is 240 bits long (10 words - 24 bits each) and the log contains a total 720
bits (90 bytes) of information (240 bits x 3 subframes). This information is preceded by the
PRN number of the
satellite from which it originated. This message will not be generated unless all 10 words from all 3 frames have
passed parity.
Ephemeris data whose toe (time of ephemeris) is older than six hours will not be shown.
Structure:
Example:
$REPA,14,8B09DC17B9079DD7007D5DE404A9B2D04CF671C6036612560000021804FD,
8B09DC17B98A66FF713092F12B359DFF7A0254088E1656A10BE2FF125655,
8B09DC17B78F0027192056EAFFDF2724C9FE159675A8B468FFA8D066F743*57[CR][LF]
REPB
Format: Message ID = 14 Message byte count = 108
$REPA prn subframe1 subframe2 subframe3 *xx [CR][LF]
Field # Field type Data Description Example
1 $REPA Log header $REPA
2 prn PRN of satellite from which data originated 14
3 subframe1 Subframe 1 of ephemeris data (60 hex characters) 8B09DC17B9079DD7007D5D
E404A9B2D
04CF671C6036612560000021
804FD
4 subframe2 Subframe 2 of ephemeris data (60 hex characters) 8B09DC17B98A66FF713092F
12B359D
FF7A0254088E1656A10BE2F
F125655
5 subframe3 Subframe 3 of ephemeris data (60 hex characters) 8B09DC17B78F0027192056E
AFFDF2724C
9FE159675A8B468FFA8D066
F743
6 *xx Checksum *57
7 [CR][LF] Sentence terminator [CR][LF]
Field # Data Bytes Format Offset
1 Sync 3 char 0
(header) Checksum 1 char 3
Message ID 4 integer 4
Message byte count 4 integer 8
2 PRN number, 1-32 4 integer 12
3-4-5 Ephemeris data, data [90] 90 char 16
Filler bytes 2 char 106