Abstract:

An algorithm of directions of arrival estimation for multicomponet frequency-hopping signals based on spatial time-frequency analysis is proposed, which can realize direction-of-arrival (DOA) estimation in underdetermined condition. First, a clear time-frequency representation is gained by short-time-Fourier-transform (STFT) and smoothed-pseudo-Wigner-Ville distribution (SPWVD) synthesis method, which can obtain robust results with good time-frequency concentration and suppression cross-term interference performance. Then, effective hops are selected from the time-frequency distribution, and every hop’s spatial time-frequency matrix is built. Finally, every hop’s DOA is estimated by three methods: linear spatial time-frequency method, bilinear spatial time-frequency method, and root-MUSIC. The simulation results demonstrate that the estimation algorithm is effective.