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本文首先分析了小波变换对信号突变的敏感性，并以此来检测跌落零件冲击信号的到达时刻，从而估计不同传感器所测得的冲击响应信号之间的时间延迟。模拟跌落冲击的实验数据验证了该方法的有效性。
In this paper, the sensitivity of wavelet transform to signal abrupt changes is analyzed firstly, and then the arrival time of the impact signal of the drop part is detected to estimate the time delay between the impulse response signals measured by different sensors. Experimental data simulating drop impact verify the effectiveness of this method.