最后构建全维状态观测器，实现对球体目标的跟踪。

Finally, based on full state observer theory, the ball can be tracked.

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状态观测器的设计分为全维状态观测器和降维状态观测器，控制规律为时变的线性状态反馈。

The full-dimension state observer and reduced-dimension state observer are developed respectively. The control law is time-varying linear state feedback.

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状态观测器的设计分为全维状态观测器和降维状态观测器，控制规律为时变的线性状态反馈。

The full-dimension state observer and reduced-dimension state observer are developed respectively. The control law is time-varying linear state feedback.

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