The precision of survey system is much higher than navigation system's.
惯性测量精度通常要求比惯性导航精度高几个数量级。
An error analysis of the system must be made to ensure that the system conforms to the required precision of survey in construction.
为了确保导向系统测量精度达到施工测量的精度要求，必须对自动导向系统的测量误差进行分析。
This article give a kind of location method, which determines direction by radar, then filters error by mathematical method in order to raise the precision of survey result.
本文以雷达为例给出一种测向定位方法，并以数学方法滤去误差，提高测量结果的精度。
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