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文章提出了一种基于功率谱相消的调频干扰信号检测方法。该方法主要利用定频干扰信号、调频干扰信号瞬时频率随时间变化的差异性,将两段相邻数据的功率谱进行相减,消弱定频干扰信号和噪声信号的功率谱的同时基本保留调频干扰信号的功率谱,再设置合适门限提取每段剩余数据的中心频率估计值,最后根据每段剩余数据的中心频率估计值与时间的变化关系来判断调频干扰信号的存在性。仿真分析表明,该方法对调频干扰信号的识别准确率较高。
In this paper, we propose a method to detect the FM interference signal based on the power spectrum cancellation. The method mainly utilizes the difference of the instantaneous frequency of the frequency-modulated interfering signal and the frequency-modulated interfering signal with time, subtracts the power spectrum of two adjacent segments of data, weakens the power spectrum of the fixed-frequency interfering signal and the noise signal, and basically retains the frequency-modulated interference Signal power spectrum, then set the appropriate threshold to extract the estimated center frequency of each piece of residual data, and finally determine the existence of FM interference signal according to the relationship between the estimated center frequency of each piece of residual data and time. Simulation analysis shows that this method has higher recognition accuracy for FM interference signals.