state coordinates

Among them, an outdoor test track inspection apparatus includes rail inspection instrument measured the orbital plane coordinates, track top elevation, gauge, level, track direction, height and distortions state track geometry parameters.

其中，轨检仪室外检测内容包括轨检仪实测轨道平面坐标、轨顶高程、轨距、水平、轨向、高低及扭曲等轨道几何状态参数。

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At the same time in three coordinates, mathematical models of PWM rectifier are established. Secondly, based on the research of feedback linearization control theory, concluding input state feedback and input and output feedback, which two methods of feedback linearization are given.

同时针对三种坐标，分别建立PWM整流器的数学模型。其次，对反馈线性化控制理论进行研究，给出输入状态反馈和输入输出反馈两种反馈线性化方法。

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In the proposed method the SCADA data from other parts of power system are synchronized by the accurate data produced by PMU and the time coordinates are marked off into the former, then the accuracy of the data are further improved by state estimation.

该方法利用PMU所产生的精确数据来同步系统其它部分的SCADA数据，并对其加上时间坐标，然后进一步利用状态估计来提高数据精度。

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