Nested 阵列宽带 LFM 信号二维DOA 估计

doi:10.12066/j.issn.1007-2861.2183

摘要/Abstract

摘要：

Nested 阵列以其大阵列孔径和更多自由度的优点,成为近期研究的热点。但大多集中在对窄带、平稳信号的波达方向(direction-of-arrival, DOA)估计,针对宽带信号,特别是非平稳宽带信号的研究较少。本工作基于分数阶傅里叶变换,应用 DOA 矩阵方法,提出一种 Nested 阵列二维测角算法,不需进行二维非线性搜索和参数配对,可实现对宽带线性调频信号的空间波达角精确估计。仿真结果验证了该算法的优越性。

关键词: Nested 阵列, 分数阶傅里叶变换, 矩阵法, 宽带, 波达方向估计

Abstract:

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.

Key words: Nested array, fractional Fourier transform (FrFT), matrix method, wide-band, direction-of-arrival (DOA)

中图分类号:

TN911.7

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.

LI Xiaolin, ZHANG Wenjun. Two-dimensional DOA estimation for wideband LFM signals based on Nested arrays[J]. Journal of Shanghai University（Natural Science Edition）, 2020, 26(4): 506-517.

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