Wideband Direction of Arrival Estimation in the Presence of Unknown Mutual Coupling

Sensors

Zengping Chen¹  Weixing Li¹  Rui Guo¹  Yue Zhang¹  Jianzhi Lin¹ 

[1] School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;

关键词: wideband;    uniform linear array;    mutual coupling;    direction of arrival;   

DOI  :  10.3390/s17020230

来源: DOAJ

【 摘 要 】

This paper investigates a subarray based algorithm for direction of arrival (DOA) estimation of wideband uniform linear array (ULA), under the presence of frequency-dependent mutual coupling effects. Based on the Toeplitz structure of mutual coupling matrices, the whole array is divided into the middle subarray and the auxiliary subarray. Then two-sided correlation transformation is applied to the correlation matrix of the middle subarray instead of the whole array. In this way, the mutual coupling effects can be eliminated. Finally, the multiple signal classification (MUSIC) method is utilized to derive the DOAs. For the condition when the blind angles exist, we refine DOA estimation by using a simple approach based on the frequency-dependent mutual coupling matrixes (MCMs). The proposed method can achieve high estimation accuracy without any calibration sources. It has a low computational complexity because iterative processing is not required. Simulation results validate the effectiveness and feasibility of the proposed algorithm.

【 授权许可】

Unknown