User's Manual

5 Using the GPS Receiver
64 Juno SA Handheld User Guide
Postprocessed DGPS
In postprocessed DGPS, the collected GPS data is transferred to an office computer,
and measurements from the base station are downloaded. You can postprocess GPS
data collected with Trimble GPS field software using:
• the GPS Pathfinder Office software version 5.00 (with the latest updates) or
later.
• the Trimble GPS Analyst extension for Esri ArcGIS software version 2.30 (with
the latest updates) or later.
Factors that affect the accuracy of postprocessed DGPS include the type of receiver
and antenna used at the base station, the distance between the base station and the
location where the rover data was collected, the accuracy of the base station position,
and the logging interval at the base station.
For more information, refer to the documentation provided with the postprocessing
software.
Postprocessed real-time DGPS
The accuracy of positions using the Juno SA handheld is within one to three meters
postprocessed, or two to five meters with real-time differential correction. The
accuracy of real-time SBAS corrected positions can be improved to one to three meters
with postprocessing.
If your data files contain autonomous (uncorrected) positions as well as real-time
corrected positions, Trimble recommends that you postprocess the data. During
postprocessing, you can choose whether to correct only autonomous positions, or all
positions.
For more information about GPS and DGPS, go to www.trimble.com/gps and review
the All About GPS tutorial.
Outputting NMEA data
You can use the Juno SA handheld’s integrated GPS receiver with any GPS field
software that accepts NMEA messages.
If you connect to the GPS receiver using Trimble GPS field software, by default the
NMEA output is switched off.
Note – You can only configure NMEA data output using the GPS Controller software. The
software is provided free from the Trimble website. For more information, see GPS
Controller software, page 58.