John Deere STARFIRE RTK OMPFP11348 - Manual (Page 14)

900 MHz RTK—Base Station Setup
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RTK Network Base Station Setup
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A—5 Degrees Off the Horizon
(Mask)
Installing and operation of the Base Station Receiver.
The base station is the most critical part of the RTK
operation. Setting up a base station correctly is vital to the
operation of the RTK system. If the Base Station Receiver
is setup in a questionable location, the receiver could
have two separate issues; Shading and Multipathing.
Shading:
To ensure proper operation of a RTK base station, the
GPS Receiver must have a clear view of the sky in all
directions above 5 degrees off the horizon. Both the base
receiver and the vehicle receiver will use any satellites
that are above 5 degrees off the horizon. If a base station
receiver cannot use a satellite above 5 degrees, then all
vehicles operating on that base station also cannot use
that blocked satellite. This is called Shading of the base
station. If enough shading occurs, the RTK system may
become inaccurate. Many things can cause shading, such
as buildings, towers, poles, and grain legs.
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