User's Manual Part 3

GeoExplorer 2008 Series User Guide 123
Troubleshooting 7
Real-time DGPS issues
Problem Cause Solution
The handheld is not
receiving SBAS
real-time corrections
The SBAS satellite is
obstructed from view.
Check the location of the SBAS satellite in the Skyplot section
of the GPS field software, and if possible move to a different
location.
You are outside the
WAAS, EGNOS, or MSAS
coverage area.
Wide Area Augmentation System (WAAS) satellites are
tracked in the Continental United States including Alaska,
and in southern parts of Canada.
European Geostationary Navigation Overlay Service (EGNOS)
satellites are tracked in Europe.
MTSAT Satellite-based Augmentation System (MSAS)
satellites are tracked in Japan.
If you have selected satellites that are not available at your
location, you cannot use SBAS corrections.
The handheld is not
able to track a new or
a specific SBAS satellite
You are not using the
latest SBAS configuration
(.ini) file.
1. To download the software, go to
www.trimble.com/support.shtml, click the link for your
receiver type (GeoXH, GeoXM, or GeoXT), click
Downloads, click GeoExplorer 2008 Series and then click
SBAS.INI.
2. To specify the satellites you want the receiver to track or
to ignore, select the Custom option in the Tracking
Mode field in the Integrated SBAS Settings form of the
Trimble GPS field software.
The handheld is not
receiving real-time
corrections from the
external real-time
correction source
There is no physical
connection to the
external source.
Connect the external real-time correction source to COM1
using the optional serial clip, or to a Bluetooth port on the
handheld.
There is no Bluetooth
wireless connection to
the external source.
The Bluetooth external correction source is more than ten
meters from the handheld, or is obstructed. Move the devices
closer together, in a direct line of sight, to re-connect.
The external source is
incorrectly connected to
the real-time COM port.
In the Real-time Settings section of the GPS field software,
select the COM port that the real-time source is connected
to.
Note – If you are using a non-Trimble application, use the
GPS Connector software to create a connection between the
COM port and the integrated GPS receiver’s real-time GPS
COM port (COM4). In the GPS Controller software, configure
the receiver to use real-time corrections from an External
Source using the handheld's "Receiver Port". For more
information, see Using real-time corrections from an external
correction source, page 70.
The port settings are
incorrect.
Change the port settings to match those used by the external
source.
No GPS positions are
available.
You cannot use real-time corrections until the GPS receiver is
computing positions. In the GPS field software, make sure
that the integrated GPS receiver is activated, enough
satellites are available, and that the satellite geometry
(PDOP) is good enough to compute positions.
Integrated SBAS is
selected as the second
choice source of real-time
corrections.
If the SBAS status is Waiting, the integrated GPS receiver may
incorrectly change the status of the preferred real-time
choice to Waiting as well. To avoid this, select Wait for real-
time or Use uncorrected GPS as your second choice.