无线电工程

描述了以Logistic混沌信号为例的混沌信号数字化处理方法。分析了混沌信号的频谱特性、自相关特性和模糊函数,并采用MATLAB对Logistic二维混沌映射信号的特性进行了仿真分析。说明了混沌信号的强抗干扰性及较高的距离速度分辨力适用于抗干扰测量系统。采用FPGA实现数字Logistic序列,并针对混沌序列的有限精度效应加入扰动,验证了生成序列的频谱及自相关为混沌特性。

The digitization and realization based on the Logistic chaostic signal were researched.The autocorrelation,spectrum and the ambiguity surface associated with the Logistic signals were analyzed.The simulation about the characteristic of Logisticmap signal using MATLAB was given.It is confirmed that the chaotic signal inspired by digital chaotic sequence provides good anti-jamming capability and excellent resolution of distance and velocity.After that,the Logistic sequence were realized using the FPGA.An approach to realize finite precision chaotic sequence via perturbation were also presented,and the result was proved to be chaotic properties in the autocorrelation and spectrum analysis.