GPSbased land slope leveling technique and its implementation
(Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing 100083, China)
Abstract:In order to improve the land slope leveling accuracy and achieve high quality irrigation, a GPSBased land slope leveling system was developed. The system consists of GPS receiver, vehiclemounted IPC, controlconversion module, hydraulic system and earthmoving equipment. And the software of the system is programmed in Visual C++ 6.0. The system can measure farmland topography instantaneously, and perform land slope leveling. First of all, the GPS receiver is installed in the earthmoving equipment to measure farmland topography in a serpentine path; the topography data are corrected with a correction algorithm to reduce the error. Then, a threedimensional topography is visualized and a farmland slope model is established by using the corrected data to obtain the expected slope reference elevation. Finally, the realtime elevation is compared with the slope reference elevation, the comparison result is input to the controlconversion module, and its output signals are used to drive the hydraulic system for leveling the land. The land slope leveling implementation was carried out in a land with 180 m longitudinal size and 1/1 000 longitudinal slope. The results showed that the standard deviation is about 5 cm, the mean elevations at top and bottom of the slope is about 40.62 m and 40.78 m, respectively, causing a 16 cm difference in elevation compared with 18 cm theoretical differences. Thus, the preliminary goal has been achieved.
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