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针对Duffing振子进行同频微弱信号检测时存在的检测盲区,提出了一种策动力移相法予以消除.结合微弱信号特性对检测盲区表达式进行分析,得出了策动力与待测信号的“相差”位于检测盲区时的角度范围,通过使策动力相位产生相移量π后实现对同频信号的检测,实验证明了方法的可行性.为了克服定性分析的不足和有效区分振子系统信号检测过程中出现的不同状态,构造了一个基于类Halmiton系统的检测统计量,并设计了基于该统计量的任意频率信号检测方法步骤,方法的核心是以检测统计量出现极大值处所在的连续两个频点作为待测信号的频率范围.在不同检测过程的仿真实验基础上,给出了混沌、间歇混沌和大周期的检测统计量数值范围,进而利用该数值范围作为判据实现了对任意频率信号的检测.实验结果表明,该方法不仅为系统状态提供了定量的判据准则,而且提高了信号检测性能,进一步完善了现有利用Duffing振子进行微弱信号检测的方法.
Aiming at the detection blind spot existing when Duffing oscillator is used to detect the weak signal of the same frequency, a method of phase-shifting by propulsion is proposed to eliminate it.According to the weak signal characteristics, the expression of blind detection zone is analyzed, “Difference” is located in the range of angle when detecting the blind zone, and the detection of the same frequency signal is realized by making the phase shift π of the driving force phase.The experiment proves the feasibility of the method.In order to overcome the deficiencies of qualitative analysis and effectively distinguish the oscillator system Signal detection process in different states, constructed a detection class based on Halmiton-like statistics, and designed based on the statistics of arbitrary frequency signal detection method steps, the method is based on the detection statistics where the maximum As the frequency range of the signal to be measured.On the basis of the simulation experiments of different detection processes, the numerical range of the detection statistic of chaos, intermittent chaos and large period is given, and then the numerical range is used as the criterion The detection of arbitrary frequency signal.The experimental results show that this method not only provides a quantitative criterion for the system state, Improved signal detection performance is further improved using conventional Duffing oscillator for weak signal detection method.