Abstract
Concerning the problem of demodulating the weak Binary Phase Shift Keying (BPSK) signal,the demodulation method based on chaotic system was researched. The basic principle of the chaotic system weak signal detection was introduced. By combining with the phase condition of the phase change happening and the modulation method of BPSK signal,the methods and steps of using Duffing system to demodulate the BPSK signal in strong noisy background were given. And a new method was presented for power spectrum entropy to judge the complexity of the different system state. Based on theoretical analysis,the simulation model based on Matlab/Simulink was built. The digital simulation results show that the performance of demodulating the weak BPSK signal using chaotic oscillator and power spectrum entropy is better than that of traditional coherent demodulation method.
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