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A-30 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
A.17.23 Report Packet 0x42
This packet provides current GPS position fix in XYZ ECEF coordinates. If the I/O
“position” option is set to “XYZ ECEF” and the I/O “precision-of-position output” is set
to single-precision, then the GPS receiver sends this packet each time a fix is computed.
The data format is shown below.
The time-of-fix is in GPS time or UTC as selected by the I/O “timing” option. Packet 83
provides a double-precision version of this information.
A.17.24 Report Packet 0x43
This packet provides current GPS velocity fix in XYZ ECEF coordinates. If the I/O
“velocity” option is set to “XYZ ECEF, then the GPS receiver sends this packet each time
a fix is computed. The data format is shown below.
The time-of-fix is in GPS time or UTC as selected by the I/O “timing” option.
Table A-27. Report Packet 0x42 Data Formats
Byte Item Type Units
0-3 X SINGLE meters
4-7 Y SINGLE meters
8-11 Z SINGLE meters
12-15 time-of-fix SINGLE seconds
Table A-28. Report Packet 0x43 Data Formats
Byte Item Type Value
0-3 X velocity SINGLE meters/second
4-7 Y velocity SINGLE meters/second
8-11 Z velocity SINGLE meters/second
12-15 bias rate SINGLE meters/second
16-19 time-of-fix SINGLE seconds