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GPS林業(yè)定位誤差分析與野點剔除方法
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Error Analysis and Outlier Elimination Method in Forestry
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    針對林業(yè)GPS定位精度不高和利用差分技術提高定位精度時存在諸多局限性的問題，研究自主式提高精度方法，利用Trimble AgGPS132進行了單機定位試驗，分析了試驗數(shù)據(jù)的頻數(shù)分布和野點剔除方法，對比分析了野點剔除前后的精度和散點分布圖，探討了野點存在的原因、解決辦法和提高動態(tài)定位精度的方法，實際數(shù)據(jù)表明，采用萊以特準則剔除野點能夠有效地改善數(shù)據(jù)處理結果，提高定位精度，利用加入控制點的方法可很好地校正GPS測得的動態(tài)定位數(shù)據(jù)的整體漂移。

    Abstract:

    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.

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張慧春,鄭加強,周宏平. GPS林業(yè)定位誤差分析與野點剔除方法[J].農(nóng)業(yè)機械學報,2010,41(5):143-147. Error Analysis and Outlier Elimination Method in Forestry[J]. Transactions of the Chinese Society for Agricultural Machinery,2010,41(5):143-147.

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