The structural invariability principle and PID control were adopted to carry out force tracking from this point to another.

通过采用结构不变性原理及PID控制来实现力的逐点跟踪。

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It is proven that the new controller can guarantee the perfect motion tracking. On the other hand, the force tracking error is bounded with the bound being adjustable.

证明了新的控制器一方面保证了运动的完全跟踪，另一方面保证了力跟踪误差是有界的且界的大小是可以调节的。

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Besides, the paper applies improved impedance control based on foot position to make legs achieve good transition from sway status to supporting status and expected force tracking.

同时论文结合改进的基于位置的阻抗控制策略，实现了摆动足从摆动相到支撑相的良好过渡和期望的足力跟踪问题。

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Back on the ground, the observations are sent to a task force tracking the spill.

VOA: standard.2010.07.05

One blurry image from an Air Force tracking station in New Mexico, taken about a minute before the shuttle disintegrated, shows what some observers have interpreted as a jagged leading edge on the left wing.

CNN: Piece of shuttle left wing identified

The Blue Force Tracker is a new digital tracking system, which shares information with hundreds of other commanders.

CNN: Technology links 101st on the battlefield

Charles Force was the director of the NASA tracking station in Guam, where the family was living.

CNN: The 10-year-old who helped Apollo 11, 40 years later