圆柱极化敏感阵列降维插值角度估计方法

doi:10.12305/j.issn.1001-506X.2023.09.02

摘要/Abstract

摘要：

圆柱极化敏感阵列可直接利用同一母线上的阵列数据估计目标的俯仰角, 但是在估计方位角时面临未知极化的影响。对此, 提出一种降维插值方法, 解决圆柱极化敏感阵列在未知极化下的二维波达方向(two-dimensional direction-of-arrival, 2D-DOA)估计问题。首先通过母线阵列的旋转不变性估计俯仰角, 然后利用估计的俯仰角降维设计插值方法的感兴趣范围(range of interest, ROI), 最后利用降维插值方法得到对应的方位角估计值。圆柱天线阵的每个阵元只需由一个电偶极子构成, 有效降低了系统运算负担和阵元间的互耦效应。数值实验验证了所提方法的2D-DOA估计性能。

关键词: 圆柱极化敏感阵列, 插值方法, 降维感兴趣范围, 二维波达方向估计

Abstract:

Cylindrical polarization sensitive array can directly use the array data on the same generatrix to estimate the elevation angle of the target, but it faces the unknown polarization problem when estimating the azimuth angle. In this paper, a reduced-dimension interpolation method is proposed to deal with the problem of two-dimensional direction-of-arrival (2D-DOA) estimation of cylindrical polarization sensitive array under unknown polarization. The proposed method firstly estimates the elevation angle through the rotation invariance of the generatrix array, then designs a reduced-dimension range of interest (ROI) using the estimated elevation angle, and finally obtains the corresponding azimuth estimation results by using the reduced-dimension interpolation method. Each element of the cylindrical antenna array only needs to be composed of an electric dipole, which effectively reduces the computational burden of the system and the mutual coupling effect between the elements. Numerical experiments verify the 2D-DOA estimation performance of the proposed method.

Key words: cylindrical polarization sensitive array, interpolation method, reduced-dimension range of interest (ROI), two-dimensional direction-of-arrival (2D-DOA) estimation

中图分类号:

TN911.7

胡毅立, 赵永波, 陈胜, 张梅, 牛奔. 圆柱极化敏感阵列降维插值角度估计方法[J]. 系统工程与电子技术, 2023, 45(9): 2659-2666.

Yili HU, Yongbo ZHAO, Sheng CHEN, Mei ZHANG, Ben NIU. Angle estimation method for cylindrical polarization sensitive array by reduced-dimension interpolation[J]. Systems Engineering and Electronics, 2023, 45(9): 2659-2666.

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描述	符号	取值
波长/m	λ	0.03
阵元数	N	20
目标角度	(ϕ₀, θ₀)	(75°, 50°)
目标极化	(γ₀, η₀)	(20°, 30°)
快拍数	L	100
蒙特卡罗次数	H	100

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