The result of emulation test shows that PPM control method can follow the change of ion concentration for the purposed of obtaining the indexes of small tracking error and short adjustment time.

仿真试验结果表明，PPM加药控制方法可以中和系统离子浓度的变化，达到跟踪误差小，调节时间短等性能指标。

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The series control with the velocity loop and the position loop is an effective design method in the electro-optical tracking system which requires short respond time and little tracking error.

在光电实时跟踪系统中要求响应的时间短、跟踪误差小，采用速度环和位置环的串级控制是一种有效的设计方法。

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After estimation of the after-effect time using tracking measurement trajectory data, a method is proposed to analyze after-effect error.

本文提出了一种利用外测弹道数据特性判断后效段时间，进行后效误差分析的方法。

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Investors should take the time to explore the tracking error of the funds they own or are thinking about purchasing.

FORBES: Inside The Black Box Of ETFs: Tracking Error May Cost More Than You Know