Study on digital detection technique of weak echo signals in pulse laser fuzes

The detection of echo signals is an important technique in pulse laser fuzes. The basic method of digital detection of weak signals is that, through multipoint sampling and summing, the output SNR is improved by making correlation between echo signal and transmitting signal according to the auto correlation theory. On the basis of analyzing multiple-pulse accumulation method, the single pulse accumulation method was studied, moreover the multiplex accumulation method was put forward. The differences of above accumulation methods were discussed and the simulations were carried out. The result of simulation consists with theoretic analyzing. The block diagram and flow chart were given in the end.