D Logs summary

140 MiLLennium Command Descriptions Manual

FRMA/B Framed Raw Navigation Data
This message contains the raw framed navigation data. An individual message is sent for each PRN being tracked.
The message is updated with each new frame, therefore it is best to log the data with the ‘onnew’ trigger activated.

FRMA

Structure:

FRMB

Format: Message ID = 54 Message byte count = variable
$FRMA week seconds prn cstatus # of bits framed raw data
*xx [CR][LF]
Field # Field type Data Description Example
1$FRMA Log header $FRMA
2week GPS week number 845
3seconds GPS seconds into the week 238623.412
4prn PRN of satellite from which data originated 120
5cstatus Channel Tracking Status (see Table D-7)80811F14
6# of bits Number of bits transmitted in the message. 250 for
WAAS, 300 for GPS and 85 for GLONASS. 250
7framed raw data One field of raw framed navigation data. 9AFE5354656C2053796E636
8726F6E69636974792020202
020202020B0029E40*3F
8*xx Checksum *42
9[CR][LF] Sentence terminator [CR][LF]
Field # Data Bytes Format Units Offset
1 Sync 3 char 0
(header) Checksum 1 char 3
Message ID 4 integer 4
Message byte count 4 integer bytes 8
2Week number 4 integer weeks 12
3Seconds of week 8 double seconds 16
4PRN number 4 integer 1-999 24
5Channel Tracking Status (see Table D-7) 4 integer n/a 28
6Number of Bits 4 integer 250 for WAAS
300 for GPS
85 for GLONASS
32
7Data Sub-frame variable char N/A 36