Trimble Outdoors aggps 332 Benutzerhandbuch

AgGPS 332 GPS Receiver User Guide     17

Overview     2

To obtain free radiobeacon differential signals, the AgGPS 332 receiver 
uses dual-channel, fully-automatic beacon receiver electronics and 
tracks broadcasts that conform to the IALA (International Association 
of Lighthouse Authorities) Standard. When you use beacon DGPS, the 
receiver selects the closest of the 10 most powerful radiobeacons in the 
vicinity. You can configure the receiver to search for particular station 
frequencies, or use the EZ beacon feature to select local beacons.

The receiver continuously monitors the integrity of the data received 
from the differential radiobeacons. If it finds unacceptable errors in the 
data stream, the receiver automatically switches to a different 
radiobeacon, if one is available.

Radiobeacon signal reception is generally not affected by:

hilly or mountainous terrain

tree canopy

location of the receiver inside a canyon (the signal reception 
depends on the proximity of the receiver to the transmitter) 

Radiobeacon signal reception is affected to varying degrees, by:

natural “noise”, such as lightning 

human-made “noise”, such as alternators, electric fan motors, 
radio speakers, and high voltage power lines 

Multipath 
environment

Low

Multipath errors are caused when GPS signals are reflected 
off nearby objects and reach the receiver by two or more 
different paths. The receiver incorporates the EVEREST 
multipath reduction option.

RTCM-
compatible 
corrections 

These corrections are broadcast from a Trimble 4000RSi™ or 
equivalent reference station.