GPS林业定位误差分析与野点剔除方法

GPS Positioning Error Analysis and Outlier Elimination Method in Forestry

针对林业GPS定位精度不高和利用差分技术提高定位精度时存在诸多局限性的问题,研究自主式提高精度方法,利用Trimble AgGPS132进行了单机定位试验,分析了试验数据的频数分布和野点剔除方法,对比分析了野点剔除前后的精度和散点分布图,探讨了野点存在的原因、解决办法和提高动态定位精度的方法,实际数据表明,采用莱以特准则剔除野点能够有效地改善数据处理结果,提高定位精度,利用加入控制点的方法可很好地校正GPS测得的动态定位数据的整体漂移。

Position accuracy is one of the most important parameters of GPS.Differential GPS（DGPS）can get higher position accuracy significantly,but there are many limitations for its applying ranges,so improving the accuracy by independent positioning method has important significance.Experiments in the non-differential mode by using Trimble AgGPS132 were conducted.First,the frequency distribution of the experimental data was analyzed.A method to eliminate outliers was raised,and GPS precision operating was compared before and after eliminating outliers.Finally,how to eliminate the influence of error was pointed out according to the different conditions.The results showed that adopting the Levin special criteria to eliminate outliers could improve the positioning accuracy effectively,and adding control point could correct the drift data of GPS dynamic positioning.