Trimble Juno 3B - Ensuring the accuracy of your GNSS data

74 Juno Series Handhelds User Guide
Ensuring the accuracy of your GNSS data
The Juno series handheld has an integrated GNSS receiver that provides accurate
positioning with real-time differential correction between two and five meters, or
postprocessed accuracy between one and three meters.
The accuracy that you obtain from your Juno series handheld is affected by a number
o
f factors, including whether the data is differentially corrected in real-time or after
data collection, and the availability of GPS satellites in the sky when you collect the
data.
The list below identifies the most important settings and techniques that you can use
in
the field to improve the accuracy of your data:
1. If you are using TerraSync software to collect data, use accuracy-based logging.
2. Use real-time differential SBAS corrections. For more information, see page 74.
3. Plan GNSS data collection around the times of the day when satellite geometry
is bes
t.
For more information, refer to the T
erraSync software Getting Started Guide on
http://www.trimble.com/mappingGIS/Terr
aSync.aspx?dtID=technical_support
Connecting to a real-time differential correction source
Use a real-time differential GNSS (DGNSS) source to give you better accuracy as you
c
ollect data. For more information about how real-time differential GNSS works, see
Differential GNSS explained, page 75.
ArcPad with the
GPScorrect extension
When the Trimble GPScorrect extension is installed, the extension
automatically configures the ArcPad software to use the integrated
GNSS receiver on COM4 using the Trimble GPScorrect protocol.
• To connect to GNSS, tap the
GPS button and then tap Yes.
• To configure a real-time DGNSS source, or to view status
information,
run the GPScorrect extension. To do this, tap the
GPScorrect button in the Trimble toolbar.
ArcPad without the
GPScor
rect extension
10. In ArcPad, tap the GPS drop-down menu
and then select G
PS Preferences from the
drop-down menu. Tap the GPS tab.
11. In the P
rotocol field, select NMEA 0183.
12. In the Po
rt field, select COM4.
13. Tap
OK.
14. Tap the
GPS button and then tap Yes.
NMEA application
Configure the software to connect to GNSS on COM4 and then use
the Connect or Activate GPS command.
GNSS field software Configuration details