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Acutime 2000 Synchronization Kit User Guide A-77
A Trimble Standard Interface Protocol
0x84 Report Packet 84
Double-precision LLA Position Fix and Bias
Information
This packet provides current GPS position fix in LLA coordinates. If
the I/O "position" option is set to "LLA" and the double-precision
option is selected (packet 35), the receiver sends this packet each time
a fix is computed. The data format is shown in the table below.
The time-of-fix is in GPS time or UTC, as selected by the I/O
"timing" option "packet 35." At start-up, this packet is also sent with a
negative time-of-fix to report the current stored position.
Packet 4A provides a single-precision version of this information.
"
Caution – When converting from radians to degrees, using an
insufficiently precise approximation for the constant
π (Pi) introduces
significant and readily visible errors. The value of
π as specified in
ICD-GPS-200 is 3.1415926535898.
Table A-66 Report Packet 84
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