基于直接序列扩频的鱼雷低截获概率信号及检测技术

Low Probability of Intercept Signal and Detection Technology for Torpedo Based on Direct Sequence Spread Spectrum

基于直接序列扩频信号的低截获特性,进行了直接序列扩频(DSSS)信号波形设计,包括DSSS的原理及特性、扩频序列的生成方法和性质。研究了DSSS信号的最佳检测方法,即匹配滤波器检测。通过仿真,分析了DSSS信号在理想情况下的低截获特性。理论分析和数值仿真结果表明,DSSS信号具有大的时间带宽积、低的功率谱密度、良好的分辨性能,波形具有随机性,类似白噪声,具有很好的低截获特性。

Based on the characteristics of low probability of intercept in direct sequence spread spectrum（DSSS） signal, a waveform of DSSS is designed with respect to the principle and feature of DSSS, the method for generating spread spectrum sequence, and the characteristics of the spread spectrum sequence. The best detection method for DSSS signal, i.e. the detection of matched filter, is discussed. The characteristics of low probability of intercept under ideal condition is analyzed for DSSS signal through simulation. Theoretical analysis and numerical simulation show that DSSS signal has bigger product of time and bandwidth, lower density of power spectrum, better resolution performance, random waveform, and it likes white noise, so it possesses good characteristics of low probability of intercept.