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Trimble ThunderBolt E GPS Disciplined Clock User Guide 61
Trimble Standard Interface Protocol A
Report Packet 0x83: Double Precision XYZ
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
below.
Note – The time-of-fix is in GPS time or UTC, as selected by the I/O "timing" option. Packet
0x42 provides a single-precision version of this information.
Report Packet 0x84: 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 position option is selected (see packet 0x35), the
receiver sends this packet each time a fix is computed.
Note – The time-of-fix is in GPS time or UTC time as selected by the I/O "timing" option.
C
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. The value of the constant p as specified in ICD-GPS-200 is 3.1415926535898.
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
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