一种最小冗余线阵的目标DOA估计方法

A DOA Estimation Method Based on Sub-minimum Redundancy Linear Array

针对目标波达方向(DOA)估计的子空间类算法工程实现上的问题,提出了一种次最小冗余线阵的目标DOA估计方法。该方法应用孔径合成理论和最小冗余线阵理论,在保证阵列孔径等价的前提下,从工程应用的实际问题出发,对次最小冗余线阵的阵元配置进行研究。在分析MUSIC及MMUSIC算法的基础上,对次最小冗余线阵进行仿真。通过与相同孔径的均匀线阵和最小冗余线阵对比表明,次最小冗余线阵与相同孔径的均匀线阵性能相仿,并有更小的计算复杂度,比最小冗余线阵有更大的阵元灵活性,可以解决一般最小冗余线阵不能解决的相干信源的DOA估计问题。

In order to solve the problems in engineering implementation of DOA estimation,a new methodbased on sub-minimum redundancy linear array is proposed. In order to have equal array aperture and fa-vour engineering application,the configuration of sensors for sub-minimum redundancy linear array is stud-ied according to the theory of aperture synthesis and minimum redundancy linear array. MUSIC and MMU-SIC algorithms for sub-minimum redundancy linear array are simulated. Compared with uniform linear ar-ray（ULA） with the same array aperture,sub-minimum redundancy linear array has similar performancebut smaller amount of calculation;compared with minimum redundancy linear array with the same array ap-erture,sub-minimum redundancy linear array is more flexible for selecting sensors and has estimation capa-bility for coherent sources.