混沌二相码的性能分析

摘要

混沌二相码由于其抗干扰能力和低截获性能,适宜作为雷达信号.Logistic序列是常见的用于产生二相码的混沌序列,其自相关函数旁瓣较低,但是带内功率谱波动较大、互相关函数峰值较高.针对这一问题,选取混沌特性较好的四种混沌序列产生二相码,从多个方面进行分析比较.仿真结果表明,利用Chebyshev映射得到的混沌调相信号在保持自相关函数旁瓣较低的条件下,可以获得更平坦的带内功率谱和更好的互相关性能.%Chaotic biphase codes, owing to the property of ECCM and low probability of intercept, are the proper radar signals.Logistic sequence is commonly utilized for biphase code with satisfying autocorrelation performance, however, its spectrum and autocorrelation property need to be improved.To resolve this problem, four kinds of widely applied chaotic sequences are selected to produce chaotic biphase codes which are then compared with logistic biphase code.Simulation results demonstrate that the Chebyshev biphase code can obtain the flatter spectrum and favorable cross-correlation property while maintaining the advantage of autocorrelation function.