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D

Logs summary

224

 MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

This message contains the wide band range correction data.  A correction is generated for each PRN being tracked
and these group together into a single log.  Internally, the correction for each satellite is updated asynchronously
at a 1 Hz rate.  Therefore, logging this message at a rate higher than 1 Hz will result in duplicate data being output.
Each range correction is statistically independent and is derived from the previous 1 second of data.

Format:

Message ID = 67

Message byte count = 28 + (obs*16)

$WRCA

week

seconds

# obs

prn

ch-tr-status

tr-bandwidth

wide band correction

:

prn

ch-tr-status

tr-bandwidth

wide band correction

*xx

[CR][LF]

1

$WRCA

Log header

$WRCA

2

week

GPS week number

637

3

seconds

GPS seconds into the week

513902.00

4

# obs

Number of satellite observations with information to follow:

7

5

prn

Satellite PRN number 

18

6

ch-tr-status

Channel Tracking Status:  Hexadecimal number indicating phase lock, channel 
number and channel tracking state as shown in Table D-7.

E04

7

tr-bandwidth

DLL tracking loop bandwidth in Hz

0.050

8

wide band correction

Wide band range correction in metres

1.323

...
...
...

...
...
...

Next PRN number, ch-tr-status, tr-bandwidth, wide band correction
...
Last PRN number, ch-tr-status, tr-bandwidth, wide band correction

variable

*xx

Checksum

*1F

variable

[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

Number of observations (obs)

4

integer

24

5

PRN

4

integer

28

6

Channel tracking status

4

-

-

32

7

DLL tracking loop bandwidth

4

float

Hz

36

8

Wide Band Range Correction 

4

float

metres

40

9...

Next PRN offset = 28 + (obs*16)