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Lassen-SK8 Embedded GPS Module A-57
Trimble Standard Interface Protocol
A.17.55 Report Packet 0x83
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 double position option is selected, the
receiver sends this packet each time a fix is computed. The data format is shown in Table
A-63.
The time-of-fix is in GPS time or UTC, as selected by the I/O “timing” option.
Packet 42 provides a single-precision version of this information.
A.17.56 Report Packet 0x84
This packet provides current GPS position fix in LLA coordinates. If the I/O “position”
option is set to “LLA” and the double position option is selected, the receiver sends this
packet each time a fix is computed. The data format is shown in Table A-64.
The time-of-fix is in GPS time or UTC, as selected by the I/O “timing” option.
I
Caution – When converting from radians to degrees, significant and readily visible errors will be
introduced by use of an insufficiently precise approximation for the constant p (PI). The value of
the constant PI as specified in ICD-GPS-200 is 3.1415926535898.
Table A-63. Report Packet 0x83 Data Formats
Byte Item Type Units
0-7 X DOUBLE meters
8-15 Y DOUBLE meters
16-23 Z DOUBLE meters
24-31 clock bias DOUBLE meters
32-35 time-of-fix SINGLE seconds
Table A-64. Report Packet 0x84 Data Formats
Byte Item Type Units
0-7 latitude DOUBLE radians; + for north, - for south
8-15 longitude DOUBLE radians; + for east, - for west
16-23 altitude DOUBLE meters
24-31 clock bias DOUBLE meters
32-35 time-of-fix SINGLE seconds