Instantaneous frequency estimation of multi-component LFM signals based on local polynomial Fourier transform
Junjun Wu · Jisuanji yingyong yanjiu · 2012
For the problem of the instantaneous frequency estimation of multi-component linear frequency-modulated(LFM) signals,this paper presented a new method for overcoming cross-terms interference.And the local polynomial Fourier transform(LPFT) method was applied to estimate instantaneous frequency of multi-component LFM signals.By means of doing local polynomial Fourier transform on multi-component LFM signals,could separate each LFM signal,and then searched the ridge peaks of the spectrum to find the corresponding frequency according to the local polynomial periodogram of the each LFM signal,so accurately estimate the instantaneous frequency of the multi-component LFM signal.Compared with Wigner-Hough transform,the simulation results verify the availability of the proposed method.