Two-dimensional DOA estimation for wideband LFM signals based on Nested arrays
Received date: 2019-09-22
Online published: 2019-11-01
李小琳, 张文俊 . Nested 阵列宽带 LFM 信号二维DOA 估计[J]. 上海大学学报(自然科学版), 2020 , 26(4) : 506 -517 . DOI: 10.12066/j.issn.1007-2861.2183
Nested arrays have garnered significant interest owing to their large array apertures and more degrees of freedom. However, most studies have been focused on direction-of-arrival (DOA) estimation of narrow-band and stationary signals. Few studies have been conducted on wide-band signals, particularly nonstationary wide-band signals. In this paper, based on fractional Fourier transform and DOA matrix method, a two-dimensional angle measurement algorithm of nested array is proposed to accurately estimate the spatial DOA of wide-band linear-frequency-modulation signals without two-dimensional nonlinear search and parameter pairing. Simulation results confirm the superiority of the new algorithm.
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