User's Manual Part 2

GeoExplorer 2008 Series User Guide 67
Using the GPS receiver 5
The list below identifies the most important settings and techniques that you can use
in the field to improve the accuracy of your data:
Note – This list assumes that you are using Trimble GPS field software, and lists items in
order of most important to less important.
1. If you are using TerraSync software to collect data, use accuracy-based logging.
For more information, see page 67.
2. Use real-time differential corrections. If you are using a GeoXH handheld and
have access to dual-frequency corrections from a VRS network, use the
corrections from the VRS network. For more information, see page 68.
3. Configure the GPS settings for the receiver to increase the precision of your data,
and to minimize the effect of atmospheric interference and poor satellite
geometry. For more information, see page 71.
4. Connect to an external antenna, if you have one. For more information,
see page 72.
5. If you are using a GeoXT handheld, configure the data collection software to log
carrier data. If you are using a GeoXH handheld, the data collection software
logs H-Star data, by default. For more information, see page 73.
6. Plan GPS data collection around the times of the day when satellite geometry is
best. For more information, see page 73.
Using accuracy-based logging
If you are using the TerraSync software, use accuracy-based logging to ensure that only
GPS positions that meet the specified estimated accuracy are logged. GPS positions
that do not meet your accuracy requirements are not logged.
Note – Accuracy estimates for streaming (dynamic) GPS positions may not be as good as
those for static GPS positions.
To configure accuracy-based logging in the TerraSync software:
1. In the Setup section of the TerraSync software, tap
Logging Settings. The Logging Settings form
appears.
2. Tap the
Setup button below the Accuracy
Settings field. The Accuracy Settings form appears.
3. In the Accuracy Value For Display/Logging fields,
select the parameters that will be used to
determine the estimated accuracy:
– Select whether to use the horizontal or
vertical accuracy of the current GPS position.