精确林业GPS信标差分定位精度分析  

Positioning accuracy analysis of RBN DGPS applied in precision forestry

作　　者：张慧春[1,2] 郑加强[1] 周宏平[1] 

机构地区：[1]南京林业大学机械电子工程学院,南京210037 [2]昆士兰大学理学院

出　　处：《农业工程学报》2011年第7期210-214,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家"863"高技术研究发展计划资助项目(2008AA100904);"十一五"国家科技支撑计划资助项目(2006BAD08A1203);林业公益性行业科研专项经费项目(201004052;200904051);江苏省有害生物入侵预防与控制重点实验室开放课题项目(PMIS200904)

摘　　要：利用设计的Trimble AgGPS132定位试验装置进行连续时间内的单机定位试验和信标差分定位试验,作出x、y坐标多次测量结果散点分布图和同一点的多次测量结果散点分布图,平均值、标准差等结合数据分析对比其精度,检验信标差分定位系统的静态符合度和动态符合度。试验结果表明:信标差分定位比单点定位精度高,误差小,信标差分定位比单点定位横、纵坐标精度提高12%到47%,AgGPS132信标差分试验系统的静态符合度和动态符合度都较好,符合精准度要求较高的精确林业的生产作业要求。在中国建立的导航信标信号覆盖区内,采用信标差分GPS系统具有信号连续、工作稳定、精度可靠、费用低廉等优点,因此信标差分技术在精确林业应用上将具有巨大的发展潜力。To examine the applicability of GPS and Radio Beacon Differential Global Positioning System（RBN DGPS） for forestry machinery positioning,experiments were conducted using the non-differential and RBN DGPS mode-of a Trimble AgGPS132.Coordinate change process figures and scatter distribution figures were used to compare the accuracy of the different position modes.Average values and standard deviation were also used to analyze the precision.The stationary test（where the mobile platform was maintained at a fixed location） was carried out to investigate the static conformity degree.The mobile test（where the platform was moving along certain path of circle） was conducted to examine the dynamic conformity degree accuracy of GPS signals.The results showed that the RBN DGPS mode improved the accuracy of x and y axis by 12%-47% than non-differential mode.In the stationary test,the variability of x and y coordinates was much smaller in RBN DGPS than that in the non-differential mode.In the mobile test,the traces of the moveable platform（circles） were much better represented with the locations recorded in the RBN DGPS mode.It was found that RBN DGPS was more suitable than non-differential mode for precision forestry positioning requirements.In regions where beacon DGPS signal coverage in China is available,RBN DGPS has enormous potential for application of precision forestry due to its continuous signals,reliability,high accuracy and low cost.

关 键 词：全球定位系统 林业 试验 定位精度 系统符合度 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P207[天文地球—测绘科学与技术]