Novatel OM-20000041 用户手册

D

Logs summary

MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

189

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.

Format:

Message ID = 52

Message byte count = 72

$RBTA

week

seconds

prn

cstatus

message #

# of bits

raw bits

*xx

[CR][LF]

1

$RBTA

Log header

$RBTA

2

week

GPS week number

883

3

seconds

GPS seconds into the week

413908.000

4

prn

PRN of satellite from which data originated

115

5

cstatus

Channel Tracking Status

80812F14

6

message #

Message sequence number

119300

7

# of bits

Number of bits transmitted in the message.  At present, 
always equals 256 bits.

256

8

raw bits

256 bits compressed into a 32 bytes.  Hence, 64 hex 
characters are output.

30FB30FB30FB30F878DA621
94000F18322931B9EBDBC1C
BC9324B68FBDAEBE8A

9

*xx

Checksum

*42

10

[CR][LF]

Sentence terminator

[CR][LF]

1

Sync

3

char

0

(header)

Checksum

1

char

3

Message ID

4

integer

4

Message byte count

4

integer

bytes

8

2

Week number

4

integer

weeks

12

3

Seconds of week

8

double

seconds

16

4

PRN number

4

integer

1-999

24

5

Channel Status

4

integer

n/a

28

6

Message #

4

integer

n/a

32

7

# of Bits

4

integer

n/a

36

8

Raw Bits

32

char

n/a

40