为了检测在强干扰背景下的载波信号,提出了将Duffing混沌振子应用到三态脉冲位置调制信号检测中.检测过程首先调节系统的策动力f,确定系统的策动力阈值f_d.当三态脉冲信号加入系统后,系统从混沌态转变为大尺度周期状态,则检测出信号中包含有周期信号;如果系统继续处于混沌状态,则说明输入信号为纯噪声.仿真结果表明当信噪比大于-23 dB时所提方法能有效地检测微弱载波信号.
To detect the carrier signal in the background of strong interference, a Duffing chaotic oscillator was applied to the triple-state pulse position modulation signal detection. The driving force f was adjusted in the detection process, which determined threshold f_d of the system driving force. When the triple-state pulse signal was added in the system, which turned into a state of large-scale cycles from chaotic state,a periodic signal was detected in the input signals. If the system continued to be in the chaotic state,it indicated the input signal was the pure noise. Simulation results show that the method proposed can effectively detect a weak carrier signal when the signal to noise ratio is greater than -23 dB.
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