Step 4. Precision Requirements Too Stringent For Rtk; Step 5. Your Rover Receiver May Be Malfunctioning - ashtech Z-Xtreme System Manual

a. Use the Mission Planning software to examine expected DOP values for
periods during which you would like to perform your survey.
b. Avoid surveying during periods where DOP values are above 4.
c. For the highest level of accuracy, limit surveying to periods where DOP
values are between 1 and 2.
d. Remember that obstructions to line-of-sight between the GPS receiver
antenna and the satellites will block out satellite signals. Every time a
satellite is lost due to obstructions, DOP values will be adversely affected.
An obstructed area may not be suitable to meet your precision needs due
to the adverse effect on satellite geometry.

Step 4. Precision requirements too stringent for RTK?

If the RTK system is not delivering the precision requirements you need for your spe-
cific task, it is possible that your precision requirements are too stringent for the RTK
system. Review your system documentation to determine the precision specifications
for the RTK system.
Precision not beyond capability
Go to step 5 below
Precision beyond capability
Your precision requirements are not attainable through RTK surveying. You
will need to find some other measurement system to perform your survey.

Step 5. Your rover receiver may be malfunctioning

Contact your local dealer or Ashtech customer support for assistance.
This concludes the troubleshooting section. If the tips given here did not help you to
resolve your problem with your ZX SuperStation, please call your local dealer or Ash-
tech customer support for assistance.
88 Real-Time Kinematic Surveying