Lorenz混沌调频雷达信号性能分析

摘要

In order to improve the performance of radar system, overcome the disadvantage of discrete chaotic FM signal's small Lyapunov index, which causes the poor chaotic characteristics. Lorenz chaotic FM signal was proposed, using Lorenz continuous chaotic system to produce the Lorenz chaotic FM signal, whose initial value was optimized. The Lorenz chaotic FM signal was applied to radar. Based on the simulation and comparative analysis of Lorenz chaotic FM radar signals from autocorrelation, anti-interference ability and phase diagram, the simulation results showed that Lorenz chaotic FM radar signal could improve radar's ranging accuracy, image quality and anti-interference ability.%为了提高雷达系统的性能,克服因离散混沌调频信号李雅普诺夫指数小造成混沌特性差的缺点,提出了 Lorenz混沌调频信号.通过经初值优化处理后的Lorenz连续混沌系统产生该调频信号,将其应用于雷达中.从自相关、抗干扰能力、相图3个方面对Lorenz混沌调频雷达信号进行了仿真对比分析.仿真结果表明,Lorenz混沌调频雷达信号提高了雷达的测距精度、成像质量和抗干扰能力.