Multiple detection and Direction-of-arrival (DOA) estimation of bird sources have been studied for some years. In Hudson and Yao, we used the k-th suband of the cross-covariance matrix of H-frame of contiguous array of N sensors data to perform an eigen-decomposition . The ratios of the larger eigenvalues in Dk relative to the smallest eigenvalue provide a possible detection criterion for various sources and the corresponding eigenvectors can be used to estimate the DOA's of multiple sources. In Yu, et al, the phase differences among the sensors are used to analytically obtain the DOA without needing any optimization operations. In this manuscript, we combine the previous two techniques to obtain an efficient fast analytical DOA estimation of the sources based on the eigenvectors. Simulations of field measured array data are used to confirm the proposed scheme.
