文献类型：期刊文献

英文题名：Multi-frequency symmetric sparse nested array with scalable aperture for mixed near-field and far-field source localization

作者：Yang, Yunlong[1];Jiang, Guojun[2];Zheng, Zhi[3]

机构：[1]Donghua Univ, Sch Informat & Intelligent Sci, Shanghai 201620, Peoples R China;[2]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China;[3]Univ Elect Sci & Technol China, Sch Informat & Commun Engn, Chengdu 611731, Peoples R China

年份：2027

卷号：251

外文期刊名：SIGNAL PROCESSING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001838698800001)】；

基金：* This work was supported by the National Natural Science Foundation of China under Grant 62301141 and Grant 62101190, and the Natural Science Foundation of Shanghai under Grant 21ZR1416800.

语种：英文

外文关键词：Symmetric sparse nested array; Mixed source localization; Difference coarray; Direction of arrival estimation; Range estimation

摘要：To improve the performance of direction of arrival and range estimation for mixed far-field and near-field sources, we propose a localization scheme tailored for space-constrained platforms, which incorporates a symmetric sparse nested array (SSNA) with scalable aperture and multiple coprime rational frequencies. The physical aperture of the SSNA, formulated as a function of antenna number of subarrays, can scale with uniform step, significantly improving flexibility to maximize the utilization of the available geometric space on platforms. Benefiting from its extended unit inter-antenna spacing, the SSNA cooperated with multi-frequency can give enhanced aperture and degrees of freedom (DOF) in space-frequency domain, both of which outperform those provided by the existing arrays, thereby enabling unambiguous and high-precision parameter estimation. The closed-form expressions of coarray DOFs with the scaled apertures, are derived for both space-and space-frequency-based difference coarrays. A closed-form solution for the optimal array configuration which maximizes DOF is presented, and the maximum DOFs for the array with two and multiple frequencies are analyzed. The simulation results validate the superior performance of the proposed scheme over the existing techniques.