一种基于互质线阵的改进空间平滑信源角度估计算法

An Improved Spatial Smoothing Angle Estimation Algorithm Basedon Coprime Linear Array

本文针对互质阵列产生的虚拟阵列不连续,导致部分信息损失问题,提出一种基于阵列插值的改进空间平滑算法。该算法充分利用了虚拟域阵列的全部信息。首先将互质阵列导出至虚拟域,形成一个非均匀的虚拟阵列;然后通过插值虚拟阵元的方式,将其转变为一个连续均匀的虚拟阵列;最后利用空间平滑算法,实现了信源角度的超分辨估计。仿真结果表明:与截取最大连续虚拟阵元的算法相比,有效提升了阵列自由度和信源角度估计性能。

In this paper,an improved spatial smoothing algorithm based on array interpolation is proposed to solve the problem of partial infornation loss caused by the discontinuity of virtual armays generated by mutual prime ar rays.The algorithm makes full use of all the information of the vitual domain array.First,the prime array is ex-ported to the virtual domain to form a non-uniform virtual array.Then it is tnansformed into a continuous and uni-form vitual array by interpolating virtual elements.Finally,the spatial smoothing algorithm is used to achieve the super-resolution estimation of the source Angle.The simulation results show that compared with the algorithm of intercepting the maximum continuous virtual element,the arny freedom and source Angle estimation performance are effctively improved.