| 摘要: |
| 针对互质阵列差分共阵存在孔洞导致阵列估计性能受限的问题,本文提出了一种新的互质阵列。首先,通过分析差分共阵的结构,得出互质阵列移除部分物理阵元不会影响阵列的连续延迟；然后,利用孔三角形表示所有的孔洞元素,将移除的阵元重新排列在由孔洞位置决定的稀疏位置上,以优化阵列结构,增加连续延迟的同时减小阵元间的互耦；随后,讨论移动阵元对差分共阵的影响,推导了所提阵列连续延迟范围的数学表达式；最后,通过使用相同物理阵元数进行仿真实验,验证了所提阵列相较于其他互质阵列在DOA估计上的优越性。 |
| 关键词: 互质阵列 DOA估计 差分共阵 连续自由度 |
| DOI： |
| 分类号:TN911.7 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| A New Coprime Array for Improving Consecutive Degrees of Freedom |
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| Abstract: |
| Aiming at the problem that the existence of holes in the difference co-array of the coprime array (CA) leads to the limitation of the array estimation performance, this paper proposes a new coprime array (NCA). First, by analyzing the structure of the difference co-array, it is concluded that the removal of some physical array elements by the coprime array will not affect the consecutive lags of the array; then, using hole triangles to represent all the hole elements, the removed array elements are rearranged in sparse positions determined by the positions of holes to optimize the array structure and increase the consecutive lags while reducing the mutual coupling among the array elements; subsequently, the effects of moving the array elements on the difference co-array are discussed to derive the mathematical expression for the consecutive lags range of the proposed array; finally, the superiority of the proposed array over other coprime arrays in direction of arrival (DOA) estimation is verified by simulation experiments using the same number of physical array elements. |
| Key words: coprime array (CA) direction of arrival (DOA) estimation difference coarray consecutive degrees of freedom |