Connecting To A Real-Time Differential Correction Source - GeoExplorer 3000 Series User Manual

5
Using the GPS Receiver

Connecting to a real-time differential correction source

Use a real-time differential GPS (DGPS) source to give you better accuracy as you
collect data. For more information about how real-time differential GPS works, see
Differential GPS explained, page
Using real-time corrections from an Internet source
DGPS corrections are often broadcast over the Internet. For example, corrections
generated by a VRS network are commonly broadcast over an Internet server. A VRS
network uses data from several base stations to provide rover receivers with
corrections that are generally more accurate than corrections from a single base
station. Alternatively, you can connect to a server that provides DGPS corrections from
a single base station.
For information on how to connect to the Internet and receive real-time corrections
from an Internet server, see
access or real-time corrections (including VRS networks), page
Using SBAS corrections
The GeoExplorer 3000 series handheld has an integrated receiver that uses Satellite
Based Augmentation Systems (SBAS) correction messages to improve the accuracy
and integrity of GPS data.
The default SBAS tracking mode is Auto. In Auto mode, the receiver tracks or locks
onto the most powerful satellite signal. The GPS receiver can track two SBAS satellites
at the same time in Auto or Custom mode. It uses corrections from only one SBAS
satellite at a time, but tracking two satellites can improve the availability of SBAS
real-time corrections. For example, if you are working in environments where obstacles
may block the direct line of sight to the SBAS satellite, there is less chance of signal loss
if you are tracking more than one SBAS satellite.
Note – To turn off multiple SBAS satellite tracking, select Custom mode and then deselect
all other SBAS satellites except for the satellite you want to track.
The receiver tracks SBAS satellites according to your geographical location:
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You can configure the receiver to use particular SBAS satellites in the Integrated SBAS
Settings form of the Trimble GPS field software. Select the Custom option in the
Tracking Mode field and then enable or disable tracking for any specific satellite.
Note – If you have other Trimble GPS field software installed, configure real-time
correction settings in that application instead of the GPS Controller software.
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GeoExplorer 3000 Series User Guide
Connecting to a Bluetooth-enabled phone for Internet
Wide Area Augmentation System (WAAS) satellites are tracked in the
Continental United States including Alaska, and parts of Canada and Mexico.
European Geostationary Navigation Overlay Service (EGNOS) satellites are
tracked in Europe.
MTSAT Satellite-based Augmentation System (MSAS) satellites are tracked in
Japan.
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