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中文摘要：
针对微弱数字调制信号的解调问题，提出了利用混沌振子对周期小信号的敏感性和对噪声的免疫力来解调强噪声中幅移键控（ASK）信号的新方法。详细阐述了基于duffing振子的微弱信号检测方法，结合ASK信号的调制方式，分析了利用duffing振子解调微弱ASK信号的基本思想，并提出利用功率谱熵判别系统状态的新方法。仿真表明，在信噪比为-20dB时，该方法实现了对ASK信号的解调，且抗噪性能优于传统的解调方法。
英文摘要：
Chaotic oscillator has characteristic of sensibility to small periodic signals and immunity against noise. By making use of the characteristic, a new method of demodulating ASK signal submerged in strong noise is presented according to the demodulation problem of weak digital modulation signal. Technique of weak signal detection based on Duffing oscillator is introduced first. By combining with modulation method of ASK signal, the basic idea of demodulating ASK signal using duffing oscillator is analyzed, and a new method is presented for power spectrum entropy used to judge the system state. The simulation show that ASK signal could be demodulated at by the method presented here and the anti noise performance is better than traditional demodulation method.
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