Signal Demodulation Method for UpLink of Transponder Based on Duffing Oscillator

Based on the characteristics of the Duffing oscillator, which is sensitive to the initial value conditions and immune to noise, the Duffing oscillator can be used to detect weak signals with very low signal-to-noise ratio in strong noise. Aiming at the problem of low demodulation accuracy of the balise uplink signal transmitted in the current strong noise background, it is proposed to use the Duffing oscillator to demodulate the balise uplink signal; in view of the certain deficiencies in judging the system state by observing the phase plane of the chaotic system, and the power spectral entropy can judge the complexity and irregularity of the signal spectrum, this paper proposes to apply the power spectral entropy method to the discrimination of different output states of the system, and its feasibility is verified through Matlab simulation. The simulation experiment results show that it is feasible to demodulate the balise uplink signal by combining the Duffing oscillator and the power spectral entropy method, and this method has high demodulation accuracy and good noise resistance performance.