Trimble Outdoors aggps 332 사용자 설명서

AgGPS 332 GPS Receiver User Guide     13

Overview     2

Minimum 
elevation

> 10

Satellites that are low on the horizon typically produce weak 
and noisy signals and are more difficult for the receiver to 
track. Satellites below the minimum elevation angle are not 
tracked. 

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 
rejection option.

RTCM-compatible 
corrections

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

RTK base station 
coordinate 
accuracy

For RTK positioning, it is important to know the base station 
coordinates accurately. Any error in the position of the base 
station affects the position of the rover; every 10 m of error in 
a base station coordinate can introduce up to 1 ppm scale error 
on every measured baseline. For example, an error of 10 m in 
the base station position produces an error of 10 mm over a 
10 km baseline to the rover.

For more information about how to make sure the position of 
your base station is accurate, refer to the manual for your base 
station receiver.

Multiple RTK 
base stations

If you are using several base stations to provide RTK 
corrections to a large site area, all base stations must be 
coordinated relative to one another. If they are not, the 
absolute positions at the rover will be in error. For more 
information about how to use several base stations to cover 
your site, contact your local Trimble Reseller.