Receiver Problems
8-3
P/N: 1023998-01
Troubleshooting
b. In TRU, connect to the receiver.
c. On the TRU main screen, choose Receiver Settings > Tracking > Adv tab. Make sure
the C/A code multipath reduction check box is selected.
• Move to an area free of obstructions, if possible.
The receiver cannot obtain Code Differential and/or RTK solutions
• Incorrect Base coordinates entered.
– Specify the correct coordinates for the Base station using TRU or another suitable field data
collection software.
– There could be some obstruction to the connection.
– Clear all possible obstructions or relocate the Base so there is a “line-of-sight” path to the
Rover.
• The corresponding receiver options may be disabled or expired.
– Order a new OAF with the required options activated to enable or extend validity of the
corresponding receiver options.
– Refer to the
Topcon Receiver Utility
(
TRU) Help
for a detailed description of options.
• There are not enough common satellites. In order to obtain a fixed solution, the Base and Rover
should track at least five common satellites.
– Check the elevation masks of the Rover and Base receivers; they should be the same. To do
this, on the TRU main window, choose Receiver Setting > Tracking > Obs.
– Verify there is a clear view of the sky to allow sufficient satellite tracking.
• A discrepancy exists between the differential standards used at the Base and Rover receivers.
– Ensure the Base and Rover receivers use the same corrections input/output format:
a. Connect the receiver to a computer and open TRU (see “Connection” in the
Topcon
Receiver Utility
(
TRU) Help
embedded in the software).
b. In TRU, connect to the receiver.
c. On the TRU main window, choose Receiver Settings > Ports.
d. Double-click on the port to be configured and make sure the input mode of the Rover
matches the format of the Base output mode (i.e. RTCM3).
• Poor satellite geometry (PDOP/GDOP values are too high).
– Conduct the survey where satellite visibility is better (low PDOP value).
– Ensure the elevation mask is less than 10 degrees.
– Increase the PDOP threshold. To do this, on the TRU main window, choose Receiver
Settings > Tracking > Obs.
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