NavCom RT-3020 Rev.A - Manual (Page 25)

RT-3020S User Guide
3-23
The RT-3020S can be installed in a backpack for mobile
surveying applications.
The sensor should not be placed in a confined space or
where it may be exposed to excessive heat, moisture or
humidity.
There are no user serviceable parts inside the RT-3020
GPS sensor. Undoing the four screws, which secure the
front end plate, and the four securing the rear end plate
will void the equipment warranty.
Basics of RTK Surveying
The idea behind RTK surveys is to achieve the high
quality, low ambiguity accuracy of post-processed
position fixes, in a real time environment. In order to
accomplish this task, the
GPS data collected at the
roving sensor must have its error sources inherent to
GPS corrected as much as possible. These errors will be
accounted for virtually instantaneously; thus the Real
Time in
RTK .
Setting up a Reference (Base) Station can minimize GPS
errors in a roving GPS sensor. The reference GPS sensor
would be set up on a known surveyed location, with
this position locked in. It would then transmit its code,
clock, and
reference station coordinate information to
the roving sensor. The roving sensor would use this
information to correct each
GPS measurement it
receives.
In the RT-3020 this link between the reference station
and the rover is achieved via a 2-way, 2.4GHz Spread
Spectrum Radio ( SSR ) integrated into the RT-3020. This
SSR was designed specifically with GPS RTK in mind. It
has built in interference rejection so any extraneous