Spectra Precision ProMark 800 Reference Manual - Manual (Page 59)

47
Precise Surveying - Field Applications & Concepts
contrary, if you are using your own base, it is essential that
you install it according to the rules.
This section discusses the two basic criteria to be taken into
account when installing your own base:
1. GNSS reception conditions
2. Base position known or unknown?
When a base radio is used, there is a third criterion to be
taken into account in the choice of the base location, which
is the ability to install the radio antenna as high as possible,
with a minimum of obstructions to the working area, so that
the radio range can be as long as possible.
First Criterion:
GNSS Reception
Conditions
Make sure the base is sited in a clear area giving the best
possible view of the sky.
When possible, avoid trees, buildings or any high obstacles in
the vicinity of the base.
Having a clear view of the sky will allow the base to collect
data from a maximum of visible satellites, which is highly
recommended to perform a successful, accurate and fast
survey.
You should pay attention to low-level satellite signals coming
through trees, which may have a more adverse effect upon
system performance than those completely masked.
Base
Properly received satellites
Avoid multi-paths
Masked satellite Masked satellite
Po
or qualit
y,
lo
w-lev
el signal