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Copernicus GPS Receiver 135
TRIMBLE STANDARD INTERFACE PROTOCOL (TSIP) A
Command Packet 0x2D - Request Oscillator Offset
This packet requests the calculated offset of the GPS receiver master oscillator. This
packet contains no data. The GPS receiver returns Packet
0x4D. This packet is used
mainly for service. The permissible oscillator offset varies with the particular GPS
receiver unit.
Command Packet 0x2E - Set GPS Time
This packet provides the approximate GPS time of week and the week number to the
GPS receiver. The GPS receiver returns Packet
0x4E. The data format is shown
below. The GPS week number reference is Week # 0 starting January 6, 1980. The
seconds count begins at the midnight which begins each Sunday morning. This packet
is usually not required when the battery back-up voltage is applied as the internal
clock keeps time to sufficient accuracy. This packet is ignored if the receiver has
already calculated the time from tracking a GPS satellite.
Note – See report Packet 41 for information on the Extended GPS week number.
Command Packet 0x31 - Accurate Initial Position (XYZ ECEF)
This packet is identical in content to Packet 0x23. This packet provides an initial
position to the GPS receiver in XYZ coordinates. However, the GPS receiver assumes
the position provided in this packet to be accurate. This packet is used for satellite
acquisition aiding in systems where another source of position is available. For
acquisition aiding, the position provided by the user to the GPS receiver in this packet
should be accurate to a few kilometers. For high-accuracy time transfer, position
should be accurate to a few meters.
Table A.18 Command Packet 0x2E Data Formats
Byte Item Type Units
0-3 GPS time of week Single Seconds
4-5 Extended GPS week number INT16 Weeks
Table A.19 Command Packet 0x31 Data Format
Byte Item Type Units
0-3 X-axis Single Meters
4-7 Y-axis Single Meters
8-11 Z-axis Single Meters