Trimble Outdoors aggps 332 Benutzerhandbuch

6          Troubleshooting

6 0     AgGPS 332 GPS Receiver User Guide

This chapter describes some problems that can arise and explains how 
to solve them. It includes a series of flowcharts to help with 
troubleshooting.

As you work through this chapter, you may need to view the receiver 
status or change values in some fields. For information on how to do 
this, refer to the document called NMEA-0183 Messages Guide for 
AgGPS Receivers. This document is on the Trimble website 
(

www.trimble.com)

.

The accuracy of GPS positions is poor because 
the receiver is picking up poor quality signals 
from the satellites.

The receiver always calculates the most 
accurate position it can, given the current GPS 
satellite differential operating conditions. 

Change some or all of the following GPS 
settings:

• Minimum elevation – Increase the setting 

(the default is 8°). 

• Minimum Signal Strength – Increase the 

System Mask AMU setting (the default is 3).

• Maximum PDOP – Decrease the setting 

(the default is 13).

• GPS Mode – Change to Manual 3D 

(the default is Auto 2D/3D).

• DGPS Mode – Change to DGPS 

(the default is DGPS Auto/On/Off). 

GPS signals are reflecting off nearby trees 
and/or metal buildings and horizontal 
surfaces.

To reduce multipath noise, mount the GPS 
receiver so that it has a clear view of the sky. 
The receiver must be away from trees and 
large metal objects.

The receiver loses the satellite signal from 
time to time.

Make sure that the receiver is mounted on the 
highest point of the vehicle and is clear of 
metal surfaces.

Check Maximum PDOP and Minimum Signal 
Strength settings (see Poor accuracy, above).