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GNSS定位精度指标计算
2022-07-06 09:18:00 【Proletarians】
根据有无参考点(真值),分两种计算方式。
方式一:无真值
无真值,那么计算的就是内符合精度——定位偏差(position deviation);
因为没有外部参考,所以要采用平均值作为数据分析的center。
最重要的是要把坐标系转为ENU,再按照deviation的公式求取,分为2D和3D的形式。
方式二:有真值
有真值,说明有外部参考,就要把计算的center从平均值转为真值点了。此时可以计算CEP50,CEP95,RMS三个指标;
1、CEP50和CEP95
在BLH坐标系下计算,其中要用到大地线的知识,对求出来的距离排序,取50%或95%即可。
2、RMS
平面上,在ENU坐标系下进行计算;高程上,在BLH坐标系进行计算。
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