Nonlinear Multi-Frequency Interference Detection Methods for Electronic Communication Mutations
In electronic communication,the narrow-band signals in the same frequency band usually contain a va-riety of nonlinear signals with different frequency spectrums,causing sudden interference to communication.Therefore,a method for detecting abrupt nonlinear multi-frequency interference based on dynamic characteristics was proposed.Firstly,we built an electronic communication model to collect signal samples,and thus to complete the spread spectrum of signal according to the increasing relationship in the time domain.Secondly,the amplitude differ-ence before and after the spread spectrum was calculated.Thirdly,the real-time state characteristics of the source area were deduced according to the recursive relationship that the signal changed with time.Moreover,the DFT multi-level model was used to detect features in order.If the signal exceeded the threshold value,it was input to the next layer.If the signal was lower than the threshold value,the detection result of nonlinear multi-frequency interference was output directly.The experiment shows that the proposed method can detect the amplitude of abrupt nonlinear multi-frequency interference in the time domain and frequency domain accurately,and has better application perform-ance as well as research value.
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