在以往的小波软阈值去噪的基础上对阈值进行了一定的改进，利用小波系数对信号进行了参数的估计，与其它方法相比较，该估计参数的方法能在较低的信噪比，下比较准确的计算出信号的到达时间等重要参数，满足准确性和实时性的要求。

The soft threshold for white noise reduction have been improved. And estimated the signal parameters based on the wavelet transform coefficients. Compare with others, this method can be more accurately estimate the important signal parameters just like the arrival time of pulse. Approved by the simulations,this method also satisfied the requariments of veracity and real time.

TN974