DOA Estimation of LFM Signals

The method of demodulating was brought forward to estimate the direction-of-arrival (DOA) of linear frequency modulated (LFM) signals. First, we measure the original frequencies and LFM rates of the LFM signals, then apply the measured LFM rate to demodulate the array signals respectively, so as to make certain LFM signal a harmonic signal. Finally, the Capon beam forming method is applied to estimate its DOA. The algorithm can be used to estimate the DOA of coherent LFM signals. This method has an advantage of being less calculation and higher reliability than that based on spatial time-frequency distribution (STFD). And it was tested to be right by computer simulation finally.