Figure 1.1 Rtk Setup For Gps Surveying - ashtech Z-Xtreme System Manual

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the basic function of a base receiver in an RTK system.

Figure 1.1 RTK Setup for GPS Surveying

The RTK rover is the business end of the system. The rover system is man-portable,

usually situated in a backpack. You interface with the system through a handheld

computer/data collector. Once operational, the radio portion of the rover system

receives the transmissions from the base system containing the base GPS receiver

raw data. The radio passes the received base raw data to the rover receiver via the

serial port. Simultaneously, the rover GPS receiver collects its own raw data at its cur-

rent position. The raw data from the base GPS receiver and the raw data from the

rover GPS receiver are processed by the rover receiver and the centimeter-level vec-

tor (horizontal angle, vertical angle, and distance) between the base and rover receiv-

ers is computed. Finally, the rover receiver computes the rover position using the

known base position and the computed vector. This is the basic function of the rover

receiver in an RTK system.

With the base and rover functioning as described above, a user carrying the rover

system can move about a project site and position features of interest quickly and

accurately. Positions are computed immediately, giving the user confidence that all is

functioning properly. And since the base system does not discriminate to whom it

transmits its raw data, there is no limit to the number of rover systems that can oper-

ate off of one base station.

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