基于非对称幅度插值的二维来波方位估计

doi:10.12305/j.issn.1001-506X.2024.01.02

Abstract

Abstract:

The amplitude interpolation azimuth estimation method can obtain direction of arrival (DOA) by sampling and interpolating a few beams, which avoids intensive DOA search and is widely used in engineering. At present, most of the methods are based on one dimension, and use symmetric function for interpolation, which leads to high estimation error. In this paper, the method is extended from one-dimension to two-dimension arbitrary array by decoupling, and considering the asymmetry of left and right beams when the DOA deviates from 0°, the asymmetric function is used for amplitude interpolation with the solution condition of the slope ratio of left and right beams. Furthermore, in order to solve the problem of angle mismatch in two-dimensional asymmetric interpolation, a method of interative interpolation is proposed. Finally, the effects of the interpolation method, angle mismatch and signal to noise ratio (SNR) on the interpolation accuracy are simulated, the interpolation accuracy of the proposed method is better than that of the traditional symmetric interpolation method. Through the experimental data of Qiandao Lake, the estimation accuracy obtained by the proposed method with 10° interval interpolation can be compared with that obtained by conventional beamforming with 0.01° intensive scanning. The method presented can meet the real-time requirements of some engineering applications and achieve high accuracy of azimuth estimation at the same time.

Key words: direction of arrival (DOA) estimation, two-dimensional asymmetric interpolation, slope ratio, angular mismatch, iterated interpolation

CLC Number:

TN911.23

Xiaoyue CHEN, Xiaochuan MA, Xuan LI. Two-dimensional direction of arrival estimation based on asymmetric amplitude interpolation[J]. Systems Engineering and Electronics, 2023, 46(1): 10-21.

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插值方法	θ	ϕ
密集波束扫描	-17.85	43.51
对称线性插值	-15.979 6	43.647 4
对称二次插值	-20.257 5	45.423 9
对称高斯插值	-20.262 0	45.423 1
非对称线性插值	-19.889 8	44.009 7
非对称二次插值	-19.941 9	44.600 2
非对称高斯插值	-19.941 1	44.593 9
对称线性插值*	-15.923 2	42.885 1
对称二次插值*	-18.596 7	44.856 7
对称高斯插值*	-18.595 8	44.856 0
非对称线性插值*	-17.622 5	43.058 5
非对称二次插值*	-17.851 4	43.507 3
非对称高斯插值*	-17.850 0	43.505 7

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Two-dimensional direction of arrival estimation based on asymmetric amplitude interpolation

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