... Universal Time Coordinate 界时 time-varying coordinate 时变坐标 imaginary time coordinate 虚时间坐标 ...
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The time - varying properties can be extracted better when signal being transformed on 2d coordinate plane for the purpose of signal recognition and classification.
将一维信号变换到二维坐标平面往往更有利于描述信号的时变特征，从而实现信号的分类识别。
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