具有低截获概率的直序扩频系统

A Low Probability of Intercept Direct Sequence Spread Spectrum Systems

针对传统BPSK调制的直接序列扩频(DSSS)信号易受平方或比特延迟检波器截获的缺陷,本文用一种多电平PN码调制方法来改进直接序列扩频(DSSS)系统低截获概率(LPI)性能,并通过SystemView软件将其与传统DSSS系统的LPI性能进行了仿真和比较分析,结果表明该方法能有效抵抗平方或比特延迟检波器的侦测。

Some special detector, such as square detector and bit delay detector, can easily detect traditional Binary Phase-Shift-Keying (BPSK) modulation signal of direct sequence spread spectrum (DSSS) systems, which was a dormant disadvantage of carry-wave hiding. A new modulation can improve the performance of low probability of intercept (LPI) for DSSS systems by a multi-level pseudo-noise (PN) code. Performance of LPI in the new way has been simulated by SystemView software and compared the result with the traditional BPSK modulation. As result, the modulation can effectually avoid the detection by square detector and bit delay detector.