In this paper, the problem of direction-of-arrival (DOA) estimation with a new nested array is addressed. It is known that the original two-level nested array is composed of two uniform linear arrays (ULAs), and there exist some redundant elements in their difference co-array. In order to reduce the redundancy, a new array configuration which consists of a ULA and a non-uniform linear array, rather than two ULAs, is proposed. On one hand, the proposed array can effectively increase degrees of freedom as well as virtual array aperture. On the other hand, it has a group of continuous lags in the virtual array. Thanks to the advantages of the proposed array configuration, higher resolution and better estimation performance of DOA estimation can be achieved. Simulation results show the superiority of the proposed array structure.

中文翻译：

---

一种用于到达方向估计的新嵌套数组

在本文中，解决了具有新嵌套阵列的到达方向 (DOA) 估计问题。已知原始的两级嵌套数组是由两个均匀线性数组（ULA）组成的，它们的差分共数组中存在一些冗余元素。为了减少冗余，提出了一种新的阵列配置，它由一个 ULA 和一个非均匀线性阵列组成，而不是两个 ULA。一方面，所提出的阵列可以有效地增加自由度以及虚拟阵列孔径。另一方面，它在虚拟阵列中有一组连续的滞后。由于所提出的阵列配置的优点，可以实现更高分辨率和更好的 DOA 估计估计性能。仿真结果表明了所提出的阵列结构的优越性。