针对传统互质平面阵列(Coprime planar array,CPA)结构在使用其差分共阵(Difference coarray,DCA)进行二维波达方向(Direction of arrival,DOA)估计时存在孔洞,因此损失可用连续自由度的问题,本文提出了一种无孔洞互质面阵(Hole-free coprime planar array,HFCPA)结构.这种面阵由无孔洞互质线阵分别沿x轴和y轴扩展得到,其DCA为无孔洞的矩形阵.此外,本文还给出了最佳HFCPA结构,以充分放大可用的连续自由度.仿真结果表明,与现有互质面阵结构相比,所提面阵结构在连续自由度数量、虚拟化效率和二维DOA估计性能方面具有优越性.
Hole-Free Coprime Planar Array Design for Two-Dimensional DOA Estimation
In response to the problem of holes in traditional coprime planar array(CPA)structures when using difference coarray(DCA)for two-dimensional direction of arrival(DOA)estimation,this paper proposes a hole-free coprime planar array(HFCPA)structure.The array is obtained by extending hole-free coprime linear arrays along the x and y axes,and its DCA is a hole-free rectangular array.Furthermore,this paper presents the optimal HFCPA structure to maximize the available continuous degrees of freedom.Simulation results demonstrate the superiority of the proposed array structure over existing coprime planar array structures in terms of the number of continuous degrees of freedom,virtualization efficiency,and two-dimensional DOA estimation performance.
coprime planar array(CPA)array designtwo-dimensional direction of arrival(DOA)hole-free difference coarray
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