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针对混沌调制系统中存在相图信息泄密的问题,文中提出了基于混沌参数调制模型设计混沌频率调制系统的方法。该方法利用预传信号作为调制信号,调制混沌系统中特定的参数,使加载信息的混沌信号仅产生频谱分布上的变化,而信号的吸引子位置特性不随时间发生变化,同时文中也给出了基于误差检测的信号解调方法。通过证明及实验仿真,该系统实现了对连续信号的混沌频率调制,并有效地消除了混沌信号在相图中的分叉现象,以及提高了混沌调制系统的安全性能。
Aiming at the problem of phase information leakage in chaotic modulation system, a method to design chaotic frequency modulation system based on chaotic parameter modulation model is proposed in this paper. The method uses the pre-transmitted signal as a modulated signal to modulate the specific parameters of the chaotic system so that the chaotic signal loaded with information only has a change in the spectral distribution, while the position of the attractor of the signal does not change with time, and at the same time, Signal demodulation method based on error detection. The system achieves the chaos frequency modulation of the continuous signal, and effectively eliminates the bifurcation of the chaotic signal in the phase diagram and enhances the safety performance of the chaotic modulation system.