To solve the problem of pulse repetition interval and pulse width estimation for linear frequency modulation(LFM)signals under low signal-to-noise ratio,this paper proposes a dual filtering algorithm based on fractional Fourier transform(FRFT).This method utilizes the energy aggregation of FRFT on LFM signals,and implements fractional filtering in the optimal fractional order domain followed by frequency domain filtering,which can significantly improve signal-to-noise ratio,the accuracy of pulse repetition interval and pulse width estimation is improved.Simulation and sea trial results show that this method can achieve pulse repetition interval and pulse width estimation of LFM signals under low signal-to-noise ratio conditions.
关键词
分数阶傅里叶变换/线性调频/脉冲重复间隔/脉宽
Key words
fractional Fourier transform/linear frequency modulation/pulse repetition interval/pulse width
维普
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