4、相对定位误差（RPE，RelativePositionError） RPE定义为定位精度与定位范围最大圆半径之比，把定位精度与定位范 围联系起来考虑，是有实际意义的。
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如果全球定位系统不能修正相对论效应——爱因斯坦最著名的发现相对论的产物，这些信号就会积累大量的误差，其数据就会变得毫无意义。
If they could not correct for the effects of relativity, Einstein's most famous discovery, GPS signals would accumulate so many errors that their data would be meaningless.
将柔性坐标系引入经纬仪工业测量中，使其系统自定位不再受仪器整平误差和相对定向误差的影响。
Flexible coordinate system is introduced into theodolite industrial measurement, so there arent errors of instruments levelling and relative orientation in self locating of the system.
针对单点定位误差比较大的特点，提出了用两点相对定位的测量方法来减小定位误差。
Aimed at the characteristic of bigger single point location error, a new measuring method using two points relative location measurement to reduce location measurement error was put forward.
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