一种新的低空目标角度估计方法

doi:10.19665/j.issn1001-2400.2019.05.014

Abstract

Abstract:

Multipath distortion has been a challenge problem for direction of arrival (DOA) in low-altitude and ultra-low-altitude targets. In this paper, a novel DOA estimation method without characteristic decomposition is proposed based on the three-subarray. In view of this method, three subarrays are established by spatial smoothing to reduce the dimension of the signal matrix. On top of this, the orthogonal vector of the received signal is constructed based on the special form of the three-subarray received signal in multipath environment. Finally, a new cost function is derived to estimate the DOAs. It is worth mentioning that de-correlation and source number estimation is not required in this method. Compared with conventional methods, its superiority appears in DOA estimation accuracy for low angle targets in the low signal noise ratio by numerical simulation.

Key words: multipaths, spatial smoothing, three subarrays, direction of arrival

CLC Number:

TN820

HUANG Baotao,JIANG Min,WU Guangxin,XING Wen’ge. Novelmethod for low-altitude target angle estimation[J].Journal of Xidian University, 2019, 46(5): 98-104.

Figures/Tables 10

References 11

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实验	目标高度/m	目标距离/km	直达角度/(°)	反射角度/(°)
1	100	5	0.97	-1.31
2	200	5	2.12	-2.46
3	100	10	1.06	-1.23
4	200	10	0.49	-0.66

目标角度/(°)	WEVD算法		SS-MUSIC算法
目标角度/(°)	估计角度/(°)	均方误差	估计角度/(°)	均方误差
0.97	0.966	0.032 6	0.968	0.037 1
2.12	2.123	0.016 8	2.122	0.018 3
1.06	1.059	0.023 3	1.059	0.020 8
0.49	0.489	0.045 1	0.492	0.044 2

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Novelmethod for low-altitude target angle estimation

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