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.
［1］司永胜,刘刚,杨政,等.激光平地系统的开发与试验［J］.江苏大学学报:自然科学版,2009,30(5):441-445.Si Yongsheng, Liu Gang, Yang Zheng, et al. Development and experiment of laser land leveling system［J］. Journal of Jiangsu University: Natural Science Edition, 2009,30(5):441-445.(in Chinese)［2］中华人民共和国农业部. NY／T 2148—2012 高标准农田建设标准［S］.［3］刘玉华.浅谈激光平地机械化技术［J］.天津农林科技,2008(5):26-27.Liu Yuhua. Mechanization technology of laser leveling land［J］. Science and Technology of Tianjin Agriculture and Forestry, 2008(5):26-27.(in Chinese)［4］许迪,李益农,刘刚. 激光控制农田土地精细平整应用技术体系研究进展［J］. 农业工程学报,2007,23(3):267-272.Xu Di, Li Yinong, Liu Gang. Research progress on the application system of lasercontrolled precision land leveling technology［J］. Transactions of the CSAE,2007,23(3):267-272.(in Chinese)［5］李鑫磊.基于GPS控制的平地系统的研究与开发［D］.北京:中国农业大学信息与电气工程学院,2011.［6］Aziz S A, Steward B L, Tang Lie, et al. Multiple GPS measurements for digital elevation model［C］／／Proceedings of the 4th World Congress of Computers in Agriculture and Natural Resources. St. Joseph, USA: ASABE, 2006:329-334.［7］李益农,许迪, 李福祥, 等.GPS在农田土地平整地形测量中应用的初步研究［J］.农业工程学报,2005,21(1):66-70.Li Yinong, Xu Di, Li Fuxiang, et al. Application of GPS technology in agricultural land leveling survey［J］. Transactions of the CSAE,2005,21(1):66-70.(in Chinese)［8］Aziz S A, Steward B L, Kaleita A, et al. Assessing the effects of DEM uncertainty on erosion rate estimation in an agricultural field［J］. Transactions of the ASABE, 2012,55(3):785-798.［9］谢幸福, 刘刚, 郎晓哲, 等.激光控制平地系统激光接收器设计与试验［J］.农业机械学报,2009,40(S1):77-81.Xie Xingfu, Liu Gang, Lang Xiaozhe, et al. Laser receiver used for lasercontrolled land leveling system［J］. Transactions of Chinese Society for Agricultural Machinery,2009,40(S1):77-81.(in Chinese)
