Receiver Problems
40
P/N: 1006148-01
T
roubles
hoot
ing
•
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 SRU main window, choose Receiver Settings
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 SRU (see the
Sokkia Receiver Utility
(
SRU
)
Online
Help
).
b. In SRU, connect to the receiver.
c. On the SRU 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 SRU main window, choose Receiver
Settings
Tracking
Obs.
•
The elevation mask is above 10 degrees.
– Lower the elevation mask. To do this, on the SRU main window, choose Receiver
Settings
Tracking
Obs.
– Verify there is a clear view of the sky to allow sufficient satellite tracking.
•
The modem battery is low.
•
The specified baud rate is incompatible with the baud rates the modem supports. The baud rate is the rate at
which the receiver transmits differential messages to the modem and vice versa.
– Change the modem’s baud rate.
•
The Base and Rover modems use different radio link parameters.
– Configure the Base and Rover radio modems according to the procedures listed in the
SRU Online
Help
.
•
The distance between the Base and Rover is too far.
– Close the distance between the Base and Rover.
– Use repeaters to increase radio coverage.
•
There may be a source of radio interference that disrupts radio communications.
– Change the RF channel (if possible).
– Removing the source of the jamming signal or relocate the radio antennas (if possible).
The receiver does not start logging data
•
Make sure the recommended SD/SDHC card is being used and that the card is not damaged. See “SD/SDHC
Card Recommendations” on page 55.
•
Make sure the SD/SDHC card is properly inserted.
•
The receiver’s memory is disabled or expired.
– Make sure the memory option is enabled. For details, see the
Sokkia Receiver Utility
(
SRU
)
Online
Help
.
•
The memory card does not have free space.
– Download and/or delete data files to free up space for new files. See “Downloading and Deleting Files”
on page 37.
– The file system is not initialized. Initialize the File System on the SD card using SRU. To do this, on the
SRU main window, choose File Explorer
Initialize File System.