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6 Troubleshooting
62 AgGPS 332 GPS Receiver User Guide
6.1 Interference Problems
Loss of initialization
In RTK mode initialization can be lost when
the rover receiver is close to trees or buildings
and the number of satellites falls below four.
Additionally, initialization may be lost if the
receiver has not been tracking RTK corrections
for some time. For more information, see the
next item.
Move away from trees and obstructions to
initialize. Once initialized, approach the
obstructed area again. If the obstructions are
severe, GPS positioning may not work in that
area.
Because the GPS satellites move, there may be
times of the day when you are working in an
area with obstructions. For more information,
see the Trimble Planning software on the
Trimble website (www.trimble.com).
Not tracking RTK corrections
The radio link is down or intermittent. • Ensure that the line-of-sight between the
base and rover receivers is not obstructed.
• Ensure that the rover receiver is within
range of the radio.
• Ensure that the radio power supply is on.
Problem Possible solution
Strong magnetic fields
Strong magnetic fields have no effect on GPS
or satellite DGPS signals.
However, some computers and other electric
equipment radiate electromagnetic energy
that can interfere with a GPS receiver.
If you suspect interference from a local
magnetic field, move the receiver away from,
or turn off, the suspect electronics while
observing the number of satellites being
tracked on the receiver or the signal-to-noise
ratio (SNR) of the satellite. If the SNR goes up
when the electronics are turned off, there may
be interference from the local electronics.
FM 2-way radios
Transmitting FM 2-way radios can interfere
with OmniSTAR, WAAS, and GPS signal
reception.
Make sure that there is at least 1 m (3 ft)
between the FM 2-way radio antenna and the
receiver.
Problem Possible solution