文中利用和差集数组(SDCA)的概念,设计了一种面向非圆信号的改进嵌套阵来实现波达方向(DOA)估计。根据SDCA中正负半轴对称位置的等价性,将传统的二级嵌套阵的密集子阵部分转化为一个更为稀疏的结构,并对稀疏子阵的阵元间距进行适当扩展。仿真实验和对比分析的结果验证了所提阵型在增强阵列自由度、降低互耦效应以及提高DOA估计算法性能等方面的优越性。

An optimized nested array for noncircular sources is designed to estimate the direction-of-arrival (DOA) with the concept of sum and difference coarray (SDCA). The dense subarray of the conventional two-level nested array is transformed to a sparser structue according to the equivalence of symmetrical positions of positive and negative half axes in the SDCA, while the inter-element spacing of the sparse subarray is appropriately expanded. The results of simulation and comparative analysis verify the advantages of the proposed array in enhancing the degree of freedom of the array, reducing mutual coupling and improving the performance of DOA estimation.

TN957.2