虚拟阵列下的相干信号测向算法

大多数解相干测向算法只能应用于均匀线阵，而不能用于均匀圆阵。针对这一问题提出了一种基于虚拟均匀线阵的快速解相干波达方向估计算法，该算法对均匀圆形阵列的输出信号进行模式激励，使其成为虚拟均匀线阵，在色噪声协方差矩阵为复对称Toeplitz结构的情况下，利用空间差分方法和矩阵重构相结合来估计相干信号，并且去除非相干信号以及色噪声。该算法提高了阵列的信源过载能力，不需要进行高阶累积量的计算以及特征分解，计算机仿真结果证明了算法的有效性。

Direction finding algorithm for coherent signals by virtual array

Most of direction finding algorithms for decoherence can only be applied to uniform linear array but cannot be used for uniform circular array(UCA). A fast direction of arrival(DOA) estimation method for decoherence based on virtual uniform linear array(ULA) is proposed to this problem, the mode excitation method is used to transform the UCA in element space into a virtual ULA in mode space, the algorithm is presented to cope with the coherent sources under a condition of the colored noise covariance matrix with Toeplitz structure, it employs a method combining spatial differencing and matrix restructure to eliminate the uncorrelated sources and colored noise. The number of signals resolved by this approach can exceed the number of array elements，moreover, it does not need to compute the higher order statistics and eigen decomposition. Computer simulation indicates that the method is effective.