User's Manual Part 2

GeoExplorer 2008 Series User Guide 73
Using the GPS receiver 5
Logging carrier data
When you log carrier data, the GPS receiver logs additional data as well as GPS
position records. The additional data is used during postprocessing to improve the
accuracy of the GPS positions.
If you are using a GeoXH handheld, H-Star carrier data is logged by default. If you are
using a GeoXT handheld, carrier data is not logged by default. If you want higher levels
of accuracy and are willing to log data for 10 minutes or more while maintaining
continuous lock on at least four satellites, you can configure the GPS field software to
log carrier data.
To configure carrier data logging in the TerraSync
software:
1. In the Setup section of the TerraSync software, tap
Logging Settings. The Logging Settings form
appears.
2. In the Log Carrier Data field, select the data logging
option for the type of handheld you are using:
– If you are using a GeoXT, select Yes.
– If you are using a GeoXH, make sure Auto is
selected.
3. Tap
OK.
Planning a data collection session
To maximize productivity, plan GPS data collection
around the times of the day when satellite geometry is
best. The GPS Controller software includes a Plan
section with an animated skyplot and DOP (satellite
geometry) graph for your position for the next 12 hours.
In the Plan section, you can check the planning skyplot
as you play a session, then use the timeline to zoom in
on times when geometry is poor. As you adjust GPS
settings, the Plan section is updated, so you can see the
effect of different quality control settings.
Note – If you have other Trimble GPS field software
installed, use the planning feature in that application
instead of the GPS Controller software.