High-order extended coprime array design for direction of arrival estimation

• 作者: SHI Junpeng WEN Fangqing LIU Yongxiang LIU Tianpeng LIU Zhen
• 来源期刊: 系统工程与电子技术（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: SENSOR ARRAY SIGNAL PROCESSING AND ITS APPLICATIONS IN 5G/6G
• 页码范围: 748-755
• 页数: 8页
• 语种: 英文
• DOI: 10.23919/JSEE.2021.000064

摘要

Nonuniform linear arrays, such as coprime array and nested array, have received great attentions because of the in-creased degrees of freedom (DOFs) and weakened mutual coup-ling. In this paper, inspired by the existing coprime array, we propose a high-order extended coprime array (HoECA) for im-proved direction of arrival (DOA) estimation. We first derive the closed-form expressions for the range of consecutive lags. Then, by changing the inter-element spacing of a uniform linear array (ULA), three cases are proposed and discussed. It is indicated that the HoECA can obtain the largest number of consecutive lags when the spacing takes the maximum value. Finally, by comparing it with the other sparse arrays, the optimized HoECA enjoys a larger number of consecutive lags with mitigating mutu-al coupling. Simulation results are shown to evaluate the superi-ority of HoECA over the others in terms of DOF, mutual coupling leakage and estimation accuracy.