D Logs Summary
MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2 191
RBTA/B Satellite Broadcast Data: Raw Bits

This message contains the satellite broadcast data in raw bits before FEC (forward error correction) decoding or

any other processing. An individual message is sent for each PRN being tracked. For a given satellite, the message

number increments by one each time a new message is generated. This data matches the SBTA/B data if the

message numbers are equal. The data must be logged with the onnew trigger activated to prevent loss of data.

RBTA

Structure:

RBTB

Format: Message ID = 52 Message byte count = 72

$RBTA week seconds prn cstatus message # # of bits
raw bits *xx [CR][LF]
Field # Field type Data Description Example
1$RBTA Log header $RBTA
2week GPS week number 883
3seconds GPS seconds into the week 413908.000
4prn PRN of satellite from which data originated 115
5 cstatus Channel Tracking Status 80812F14
6message # Message sequence number 119300
7# of bits Number of bits transmitted in the message. At present,
always equals 256 bits. 256
8raw bits 256 bits compressed into 32 bytes. Hence, 64 hex
characters are output. 30FB30FB30FB30F878DA621
94000F18322931B9EBDBC1C
BC9324B68FBDAEBE8A
9*xx Checksum *42
10 [CR][LF] Sentence terminator [CR][LF]
Field # Data Bytes Format Units Offset
1Sync 3char 0
(header) Checksum 1char 3
Message ID 4integer 4
Message byte count 4integer bytes 8
2Week number 4integer weeks 12
3Seconds of week 8double seconds 16
4PRN number 4integer 1-999 24
5Channel Status 4integer n/a 28
6Message # 4integer n/a 32
7# of Bits 4integer n/a 36
8Raw Bits 32 char n/a 40