An Adaptive Filter Method of LFM Signal Based on Swept Filter

Abstract:

An adaptive filter method of linear frequency modulation(LFM) signal in white noise is discussed,and a LFM signal is produced.The LFM signal is transformed to sinusoid signal by Fourier reverse transform(FRFT).The adaptive filter,which can be replaced by swept filter,is implemented in domain u,and the filtered signal is gained with the fractional FRFT.A detailed analysis of the method performance proves that the method performance depends on adaptive filter.When LMS algorithm is used,the performance of ALE is decided by step parameter,and the step parameter is selected in practice.At last,Simulation results show that this filtering algorithm is simple to computated and easy to implement.

Key words:linear frequency modulation(LFM) signal; adaptive filter; Fourier reverse transform(FRFT); swept filter