Aiming to solve problems of warhead fragments signals processing, signal processing algorithm was discussed. The noise of signal was reduced by employing wavelet decomposition and reconstruction. The time of fragment pass though the target was obtained by adopting peak detection algorithm. Based on the method of search peak in different width scale and waveform trend by using double orthogonal wavelet, the problem of rolling waveform was solved. The problem of fragment first in, last out was analyzed, by using correlation coefficient algorithm. The problem of splicing of multiple waves was researched by employing Gabor transform which is an algorithm in joint time frequency analysis. Lots of fragments experiments of the different types of the warheads were conducted. Experimental results show that: warhead fragments capture rate of system is better than 98%, and velocity of every fragment can be given when the density is less than 20 p/m².