DOA estimation of wideband LFM RADAR signals

Direction of arrival (DOA) estimation of wideband nonstationary pulsed linear frequency modulated (LFM) signals with high chirp rates is challenging for real-time implementation. DOA estimation of such signals within a broad operational spectrum in real time requires high sampling rates which imposes significant computational demand. This paper explores this using a channelized narrowband MUSIC technique. Its performance is compared against time-frequency MUSIC and fractional Fourier transform MUSIC (FrFT MUSIC) techniques. We investigate the trade-off between complexity and DOA estimation accuracy. The results demonstrate that with a single wideband LFM signal emitter, channelized MUSIC can outperform conventional wideband DOA estimation techniques.