论文部分内容阅读
提出一种连续小波变换(CWT)用于频率急剧变化的瞬态位移干涉仪信号处理的方法.连续小波变换利用对不同频率具有不同分辨本领的特性,对信号进行时频分析,计算出信号频率,进而恢复出信号的速度.当在可变时间窗口宽度内小波的中心频率和信号局部频率相等或接近时,小波变换系数幅值最大,据此能判断出信号的频率.用连续小波变换方法对计算机模拟的位移干涉信号进行处理,恢复的速度相对误差在3%,从爆轰实验的光纤位移干涉仪信号中也能够准确地恢复出物体的速度历史.
A continuous wavelet transform (CWT) method for signal processing of transient displacement interferometer with steep frequency changes is proposed.Continuous Wavelet Transform (DWT) uses the characteristics of different resolution ability for different frequencies and performs time-frequency analysis on the signals to calculate the signal frequency , And then restore the speed of the signal.When the center frequency of the wavelet and the local frequency of the signal are equal or close to the width of the variable time window, the wavelet transform coefficient has the largest amplitude and can determine the frequency of the signal.With the continuous wavelet transform The computer simulation of the displacement interference signal processing, the recovery rate of relative error of 3%, from the detonation experiment optical fiber displacement interferometer signal can accurately recover the object velocity history.