根据毫米波目标辐射信号小波变换的特征,使用非负小波系数作信号的小波系数,对于确定的阈值,令小于阈值的小波系数为零,大于阈值的小波系数减去常数a,利用信号的方差函数推导了a的取值方法,实验表明该方法有良好的去除毫米波目标辐射信号噪声的能力。 According to the characteristics of the wavelet transform of the target radiation signal, using the non-negative wavelet coefficients as the wavelet coefficients of the signals, the wavelet coefficients less than the threshold are set to zero for the determined thresholds, and the coefficient a is subtracted from the wavelet coefficients greater than the threshold. The function derives the value of a, and experiments show that this method has a good ability of removing the noise of the target radiation signal of the millimeter wave.