Trimble GCS900 - Page 161

Troubleshooting in theField 7
The first Diagnostics – GNSS screen is the Receiver screen, if you have a
single-GNSS receiver system. The following table describes the fields in this
screen.
Field Explanation
Satellites:Used Number of satellites used for the current position solution.
The satellites must be visible by both the base station and
the machine.
You need five or more satellites to initialize, and four or
more to continue working.
Satellites:PDOP PDOP (Positional Dilution of Precision) is a quality
indicator of the current GNSS position solution. A small
PDOP is better. The PDOP must be less than seven.
SVs Tracked with Signal:L1 Number of good quality GPS L1 signals being received at
both the base and the machine.
Note – The number of L1 signals being received may be
more than the number of satellites used for the position
solution.
SVs Tracked with Signal:L2 Number of good quality GPS L2 signals being received at
both the base and the machine.
Note – The number of L2 signals being received may be
more than the number of satellites used for the position
solution.
SVs Tracked with Signal:G1 Number of good quality GLONASS G1 signals being
received at both the base and the machine.
Note – The number of G1 signals being received may be
more than the number of satellites used for the position
solution.
GCS900 Grade Control System for Excavators Operator's Manual 161