D Logs Summary

MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2 223

VLHB

Format: Message ID = 34 Message byte count = 72

Table D-12 GPSCard Velocity Status

Field # Data Bytes Format Units Offset
1Sync 3char 0
(header) Checksum 1char 3
Message ID 4integer 4
Message byte count 4integer 8
2Week number 4integer weeks 12
3Seconds of week 8double seconds 16
4Latency 8double metres per second 24
5Age 8double seconds 32
6Horizontal speed 8d ouble metres per second 40
7Track over ground (TOG) 8double degrees 48
8Vertical speed 8double metres per second 56
9Solution status 4integer 64
10 Velocity status 4integer 68
Value Description
0 Velocity computed from differentially corrected carrier phase data
1Velocity computed from differentially corrected Doppler data
2 Old velocity from differentially corrected phase or Doppler (higher latency)
3Velocity from single point computations
4Old velocity from single point computations (higher latency)
5Invalid velocity
Higher values reserved for future use