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RTK Mapping 8
Selecting a site for the base station
When selecting a site for the base station, it is important to consider
the following factors:
The base station should be positioned in an environment that is
free of multipath, has minimal sources of radio interference, and
has a clear and uninterrupted view of the sky. If possible, the
base station should be at the approximate elevation of the
rovers.
Make sure that the area you want to map is entirely within range
of the base radio. If it is not, you can place radio repeaters in
order to gain full site coverage. Alternatively, you could move
your base station to different locations throughout your data
collection session, but ensure that these locations are
homogeneous, that is, that they are from the same control
network.
Ensure that a reasonably clear line of sight is maintained
between the base and rover radios, although this depends on the
radios being used. Try to keep the base antenna as high as
possible.
When you set up a base station, it is important that you know the
coordinates of the reference position as accurately as possible. The
reference position is usually a definable point, such as an existing
survey mark. Every ten meters of error in a base station coordinate can
introduce up to 1 ppm scale error for every rover position that is
observed relative to the base station (based on distance between the
base and rover antennas).
There are several recognized methods that you can use to determine
base station coordinates (in descending order of accuracy):
published or precisely-determined coordinates
coordinates derived using a reliable differential (RTCM)
broadcast
an autonomous position generated by the receiver
TSC1 Asset Surveyor Operation Manual 201