Setting up the base station
For correct operation of the higher accuracy systems it is necessary to use a base station
GNSS receiver. All of the systems can be successfully used without a base station,
however, the specification will only be met if a base station is used.
The base station is a separate GNSS receiver that monitors signals from the GNSS
satellites. Using its knowledge of position it works out the errors in each satellite’s signal.
It also measures the carrier-phase of the signal for kinematic corrections. The carrier-phase
observations and the satellite signal errors are sent from the base station GNSS to the RT
via a radio modem (not provided).
The position of the base station GNSS antenna can either be determined by the base station
GNSS receiver or can be surveyed in by a chartered surveyor. If the base station GNSS
receiver determines its own position, through position averaging, then any error in the base
station receiver will also result in error at the RT. In order to relate the RT signals to maps,
or other items on the world, it is necessary to have a surveyor measure the position of the
GNSS antenna and then tell the base station GNSS receiver what position to use.
For many applications it is not necessary to survey in the base station antenna since an
absolute world-reference is not required. Instead, a local grid can be used.
Using the RT-Base S
The RT-Base S is a self-contained GNSS, radio modem and battery housed in an IP65-
rated case. For instructions on how to use the RT-Base S see the “RT-Base S User Guide”.
The RT-Base S is supplied with a radio modem. This should be connected to the radio
connector of the RT user cable supplied. This cable supplies power to the radio modem as
well as sending the differential corrections to the RT.
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