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arXiv 2011.13172eess.SP
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一种基于差和协阵的反向移位稀疏阵方案

A Reversed and Shift Sparse Array Scheme based on the Difference and Sum Co-array

Yan Zhou, Jin Li, Nieke Wei

摘要:

提出了一种基于差和共阵(DSCA)的反向移位(RAS)稀疏阵方案,该方案显著提高了信号源识别能力。对于原始的嵌套阵列(NA)或互质阵列(CPA),其差协阵列与和协阵列之间存在很大的重叠,这妨碍了其获得高自由度(DOF)。受此事实的启发,RAS方案被设计用于减少重叠,同时增加用于波达方向(DOA)估计的DOF。所提出的方案是有效的NA和CPA。推导了物理传感器数目与连续DSCA传感器数目之间关系的封闭表达式。与一些有代表性的基于DSCA的稀疏阵列相比,该阵列可以实现更长的连续虚拟阵列。仿真实验表明,RAS方案具有较好的DOA估计性能。

英文摘要:

The reversed and shift (RAS) sparse array scheme, which is based on the difference and sum co-array (DSCA) and remarkably enhances the capability of identifying sources, is proposed. For the original nested array (NA) or co-prime array (CPA), there exists a large overlap between its difference co-array and sum co-array, which prevents it from obtaining high degrees of freedom (DOFs). Motivated by this fact, the RAS scheme is designed for reducing the overlap while increasing the DOFs for direction of arrival (DOA) estimation. The proposed scheme is effective for both NA and CPA. The closed-form expression for the relationship between the number of physical sensors and the number of consecutive DSCA sensors is derived. Compared with some representative DSCA based sparse arrays, the proposed one can achieve longer consecutive virtual array. Simulation experiments are carried out to exhibit the enhanced DOA estimation performance of RAS scheme.

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