脉冲激光引信微弱回波信号数字检测技术研究

Study on Digital Detection Technique of Weak Echo Signals in Pulse Laser Fuzes

回波检测是脉冲激光引信工作的关键环节之一。其基本的数字检测方法是对微弱脉冲信号多点采样并求和后利用信号的相关性和噪声的非相关性来提高输出信噪比。在分析了多脉冲积累特点的基础上,研究了单脉冲积累方法,提出了复合积累方法。探讨了诸积累方法的优缺点,并进行了仿真,仿真结果与理论分析相吻合。最后给出了复合积累方法的原理框图和软件流程图。

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.