ashtech HDS800, Reference Manual

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620
Troubleshooting
To determine if the rover is computing a fixed position, you
can read the General Status screen (2nd parameter in upper
line), or use FAST Survey (
Equip
tab,
Monitor Skyplot
function).
Using either the display screen or FAST Survey, you have
determined that the rover system is not computing a “Fixed”
position. Follow the steps outlined below to troubleshoot this
problem.
Step 1. Is the
Radio Receiving
Base Data?
To determine if the rover is receiving base data, examine the
2nd line on the General Status screen. The Data Link icon
should be visible. Refer to
Radio Data Link Fails to Provide
Base Corrections to Rover on page 616 if you need to fix this
problem, and then come back to this procedure.
Step 2. Is the
Receiver Tracking
satellites?
Use either the front panel of the receiver or FAST Survey
running on the field terminal to determine if the rover is
tracking satellites.
• If the receiver is not tracking satellites , refer to Receiver
is Not Tracking Satellites on page 613 and then come
back to this procedure.
• If the receiver is tracking satellites , go to step 3 below.
Step 3. Are The
Base and Rover
Tracking at least 5
Common
Satellites?
In order for the rover to compute an RTK position, the base
and rover must observe data from at least 5 common healthy
satellites simultaneously. Without this common data, the
rover cannot compute an RTK position.
Use the receiver front panel or FAST Survey’s Monitor/Skyplot
function to determine if the base and rover are indeed
tracking at least 5 common healthy satellites.
1. If the base and rover are not tracking at least 5 common
satellites
:
• Check satellite availability. Use the Mission Planning
utility from GNSS Solutions to check satellite
availability for your current location and time. Look for
the number of satellites available higher than 5° above
the horizon. Ensure at least 5 healthy satellites are
available. If not, you will need to perform your survey
at another time.
If the problem is not yet resolved and at least 5
satellites are now tracked and used, your rover may be
malfunctioning. Contact your local dealer or email
Ashtech technical support for assistance.