超再生接收机在ISM频段下的混沌现象

Chaos of super regeneration receiver in ISM band

针对超再生振荡器的传统动力学模型的工作频率过低而不具备实际参考意义的问题,本文将超再生接收机模型提升至ISM频段下的433 MHz。使用软件的数值仿真方法对改进后的模型进行混沌态动力学特性研究,采用李雅普诺夫指数法对模型混沌状态进行定量检测,并研究该频率下不同状态的接收机对弱信号的检测能力。仿真结果表明433 MHz超再生接收机在受较低频率熄灭信号控制时能够产生混沌现象,该频段下的混沌态超再生接收机灵敏度要高于周期态约3 dB,证明了混沌能够产生并被应用于实际ISM频段下的超再生接收机,为提高超再生接收机的弱信号检测能力提供了一种可行的方案。

The super regeneration receiver model is upgraded to 433 MHz in ISM band to solve the problem that the traditional dynamic model of super regeneration oscillator works at a low frequency and has no practical reference value.The chaotic dynamic characteristics of the improved model are studied by using the numerical simulation method of the software.The Lyapunov exponent method is used to quantitatively detect the chaotic state of the model,and the detection ability of receivers in different states at this frequency is studied.The simulation results show that the 433 MHz super regeneration receiver can produce chaos when controlled by a low frequency quench signal.The sensitivity of the chaotic super regeneration receiver in this frequency band is about 3 dB higher than that in the periodic state.This proves that chaos can be generated and applied to the super regeneration receiver in the actual ISM band.This provides a feasible scheme to improve the weak signal detection capability of the super regeneration receiver.