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8 Real-Time Kinematic (RTK) Surveying
98 5700 GPS Receiver User Guide
Applications
Environmental factors
Table 8.2 lists some of the environmental factors that can affect the
quality of GPS measurements.
Table 8.2 Environmental factors affecting measurement quality
Environmental
factor
Effect Solution
Ionospheric activity Can cause rapid changes in the GPS
signal delay, even between receivers
a few kilometers apart, and increase
RTK initialization time.
Avoid surveying around midday
when ionospheric activity is high.
Tropospheric
activity
Causes a delay in the GPS signals
which varies with height above sea
level, prevailing weather conditions,
and satellite elevation.
Locate the reference station at
approximately the same elevation
as the rover.
Signal obstructions Limit the number of visible satellites
and can also induce signal multipath.
Locate the reference station in a
clear environment with an open
view of the sky.
Multipath Can cause signal reflection before
reception at the GPS antenna.
Use an antenna with a ground
plane.
Radio interference Can cause serious degradation in
signal quality or complete loss of
signal tracking.
Do not locate the reference
stationinanareawhereradio
transmission interference may be
aproblem.