CAJ | 학술논문

采用发射阵列分布式布阵、接收阵列密布阵的多通道阵列,提出了一种虚拟子阵积累算法,在获得空间分集增益的同时可以超分辨估计相干源的波达方向.先通过正交信号分选的方法在接收端得到虚拟子阵,然后叠加积累各虚拟子阵接收数据的协方差.该算法利用空间分集克服了目标闪烁,同时具备解相干的能力,且避免阵列物理孔径的损失.理论分析和仿真结果表明,该算法可以有效处理多通道阵列相干源波达方向估计.
채용발사진렬분포식포진、접수진렬밀포진적다통도진렬,제출료일충허의자진적루산법,재획득공간분집증익적동시가이초분변고계상간원적파체방향.선통과정교신호분선적방법재접수단득도허의자진,연후첩가적루각허의자진접수수거적협방차.해산법이용공간분집극복료목표섬삭,동시구비해상간적능력,차피면진렬물리공경적손실.이론분석화방진결과표명,해산법가이유효처리다통도진렬상간원파체방향고계.
In this paper, a virtual sub-array accumulation (VSA) algorithm is proposed by using the multi-channel arrays where the transmitting arrays are of distributed arraying and the receiving arrays are of close arraying, by which, the super-resolution estimation of direction-of-arrival (DOA) of coherent source can be performed, while attaining the spatial diversity gain. By taking the orthogonal signal sorting scheme, the virtual sub-array can be achieved in the receiver, and then the covariance of received data out of each sub-array accumulated. By using the space diversity, this algorithm can get over the target scintillations, be of de-coherence capability and avoid the loss of array physical aperture. Theoretical analysis and its simulation results prove the proposed algorithm to be effective in estimation of the DOA of coherent source with multi-channel arrays.