Instruction manual

Operation Page 21
Operation
What if the Base Coordinates are Unknown?
If you do not know the base station coordinates, you can use the current autonomous
position as the base station coordinates.
1. Verify the base Sensor tracks at least five satellites (use $PASHQ,STA).
2. Verify the base Sensor’s autonomous position via $PASHQ,PBN or GGA
message as described in “Monitoring Position” on page 17. Ensure also the
DOP is less than 5.
3. Send $PASHS,CPD,ENT command to the base Sensor. The autonomous
position at the time the $PASHS,CPD,ENT command received will be used
as the base station coordinates.
4. Send $PASHQ,POS command to verify the coordinates.
If you enter the base station coor dinates this way, any rover using differential data fr om the base
station can still compute very accurate positions up to centimeter level, relative to the base station.
But the absolute accuracy w ill only be as accurate as the accuracy of the autonomous position in the
base station.
CPD with DBEN message
Examine the following items prior to conducting a software setup.
1. The hardware setup is complete and correct
2. All parameters are assumed to be at the factory default settings. Refer to
“Receiver Memory Reset” on page 16 on how to reset the parameters to the
factory defaults.
3. Check both Sensor have the real-time Z (J) option installed. For information
on how to verify this option, refer to “Optional Features” on page 5.
Refer to Chapter 4, Command Response Formats for a detailed
explanation of the serial commands.
Base Setup
1. Power on the base Sensor.
2. Monitor the satellite tracking and the autonomous position as described in
“Getting Started” on page 14.
3. Enter and verify the base coordinates as described in “Entering Base Station
Coordinates” on page 20.