D Logs Summary
228 MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2
WRCA/B Wide Band Range Correction (Grouped Format)

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.

WRCA

Structure:

WRCB

Format: Message ID = 67 Message byte count = 28 + (obs*16)

$WRCA week seconds # obs
prn ch-tr-status tr-bandwidth wide band correction
:
prn ch-tr-status tr-bandwidth wide band correction
*xx [CR][LF]
Field # Field type Data Description Example
1$WRCA Log header $WRCA
2week GPS week number 637
3seconds GPS seconds into the week 513902.00
4# obs Number of satellite observations with information to follow: 7
5prn Satellite PRN number 18
6ch-tr-status Channel Tracking Status: Hexadecimal number indicating phase lock, channel
number and channel tracking state as shown in Table D-7.E04
7tr-bandwidth DLL tracking loop bandwidth in Hz 0.050
8wide band correction Wide band range correction in m etres 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]
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
4Number of observations (obs) 4integer 24
5PRN 4integer 28
6Channel tracking status 4 - - 32
7DLL tracking loop bandwidth 4float Hz 36
8Wide Band Range Correction 4float metres 40
9... Next PRN offset = 28 + (obs*16)