宽频程电侦阵列设计与二维DOA估计方法

Approach for wideband ELINT array design and two dimensional DOA estimation

在宽频程条件下,针对传统均匀阵列无法实现大角度范围内目标参数无模糊估计问题,提出宽频程电侦阵列设计及二维波达方向估计方法。该方法首先将平行互质阵列在垂直方向上扩展为双平行互质阵列;然后分别对两平行互质阵列进行虚拟阵列扩展,利用虚拟均匀线阵对目标来波方向余弦分量进行估计;最后采用方向余弦解模糊算法对模糊余弦分量进行解模糊处理,实现多目标角度参数的高精度无模糊估计。相对于传统宽频程阵列测向算法而言,所提方法无需参数配对,可实现宽频程范围内多目标参数的高精度无模糊估计。仿真实验验证了所提方法的有效性。

Focus on the issue that it is impossible for the traditional uniform array to achieve the unambiguous direction finding in a wide angular range under the wideband condition, an approach for wideband electronic intelligence (ELINT) array optimized design and two dimensional direction of arrival (DOA) estimation is proposed. Firstly, the double parallel co-prime array is designed by vertical extension on the parallel co-prime array. Then, two uniform virtual arrays are developed respectively, and the cosine components of the direction of arrival are estimated. Finally, the ambiguity resolution algorithm is applied to obtain the unambiguous cosine components, and the unambiguous angles of the multiple emitters are achieved with high accuracy. Compared with traditional algorithms, the proposed method can get the direction finding of multiple sources without ambiguity and the operation of direction pairing. The validity of the proposed method is verified by the simulation results.