Development of vehicular farmland information processing system based on Beidou positioning

A set of vehicular farmland information processing system is developed in this paper. System uses the EPCS-8980 ARM industrial control computer and embedded GIS system as the information processing center, take Beidou navigation receivers as positioning tool, and Hall approach switch sensor as unit speed detecting device, in order to realize farmland information distribution map generating, variable pesticide spraying prescription map interpretation and unit speed detecting, the prescription map is completed by off-line computer. The on-board computer receives Beidou positioning information through RS-232 interface, and interconnected with other devices of system by CAN bus. The embedded GIS system is developed with eSupermap 6.0, and working on Windows CE 5.0 operating system. A series of experiment are taken to test system function, the test results show that the prescription map interpretation time is less than 1 s, the grid discriminant error is less than 0.75 m, and the unit speed detecting error is about ±0.1 km/h. Results show that the Beidou receiver can be used in this system, system can interpret pesticide prescription map correctly.