NavCom RT-3020 Rev.F - Manual (Page 53)

RT-3020 User Guide – Rev. F
frequency GPS receivers and high speed radio
modems.
Proper setup of a reference station minimizes GPS
errors in the rover. The reference GPS sensor is set
up at a known surveyed location. With this position
locked in, it transmits its code, clock, and reference
station coordinate information to the roving sensor(s).
The roving sensor(s) uses this information to correct
each GPS measurement it receives.
The RT-3020, configured as a reference station or
rover, communicates via the integrated 2-way,
2.4GHz Spread Spectrum Radio (SSR). The SSR
was designed specifically for GPS RTK. It has built-in
interference rejection to prevent extraneous radio
signals from interfering with the reception or
transmission of the correction data.
The RT-3020, when configured as a reference
station, can transmit corrections to any number of
roving receivers capable of picking up the radio signal
and decoding one of the three GPS correction
formats (NavCom proprietary, RTCM, or CMR). At
2.4Ghz, data broadcast via modulated radio carrier
frequency is limited to line of sight for error free
reception. The signal can be received in less than
ideal environments, though some data loss may
occur. The SSR integrated into the RT-3020 provides
valid corrections up to a maximum of 10km via RTK
or 40km via
1
UltraRTK™, depending on the fade
margin environment in which the equipment is
operated.
Setup of the reference station sensor above the roving
sensors is recommended to enable transmission to all
rovers in all directions with minimal obstruction. High
frequency radio signals generally travel a shorter
distance than lower frequency signals, and do not
penetrate obstructions as well over distance. Figure 14
1
Requires NCT-2100D Engine
3-51