基于双混沌系统的非线性调频雷达信号及其特性分析

提出了两种双混沌系统的构成方案,通过双混沌系统生成了双混沌信号序列,在此基础之上,利用双混沌信号对正弦波进行调频。双混沌调频(FM)信号具有良好的自相关特性,同时使雷达波形难以辨识。用宽带模糊度函数统计平均方法研究了信号的模糊特性,并对信号的抗干扰性能进行了分析。仿真结果表明,双混沌调频信号具有极佳的距离和速度分辨率,抗干扰能力较强,是一种理想的信号形式。

The nonlinear FM radar signal based on dual-chaotic system and the analysis of its ambiguity characteristics

Two ways of forming the dual-chaotic system are presented.The dual-chaotic signal sequences are generated by these dual-chaotic systems.The dual-chaotic signals are used to modulate the sine waves.The dual-chaotic FM signals have ideal auto-correlation property and the waveform is very hard to be recognized.The ambiguity characteristics of the signals are studied through the statistic average of the wideband ambiguity function,and the anti-jamming performance of the signals is analyzed.The simulation result shows that the dual-chaotic FM signals have higher resolutions in both domains of range and velocity,and the signals have good anti-jamming performance,which makes an ideal signal form.