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对于同一个人的呼吸信号进行采集，但是对I/Q信号提取相位得到的呼吸信号差异很大，第次实验的信号很好，但是第三次实验结果很差，看不出每次的呼吸信号了，三次实验的参数一样。只有帧个数不一样。这种现象该怎么解释呢？怎么排查原因？
