RT1003 Manual
Revision: 1
90628
75
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 RT1003
via a radio modem (available separately).
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 RT1003. In order to relate the RT1003 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 and relative position is more important.