GPS data analysis, systematical error analysis, datum.
GPS数据分析，系统误差分析，基准。
This paper makes systematical analysis and subsumption for each error connection of main transformer's differential protection, and puts forward corresponding methods for correction.
文中对这种高精度角位置传感器产生误差原因进行了分析，并给出了有效消除误差的方法。
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