Two-dimensional De-coherent Mode-space Method Based on UCA
Mao Wei-pin · Fire Control and Command Control · 2015
A two-dimensional direction of arrival(DOA)estimation algorithm of coherent signals,called Mode-Space DOA Matrix(MS-DOAM) algorithm,is proposed.The algorithm uses mode-space excitation to transform the UCAs into virtual parallel linear arrays.Then,two equivalent covariance matrices are reconstructed by using cross-correlation information of array elements. A new DOA matrix is reconstructed besed on the two matrices. Eigenvalues and eigenvectors are acquired by performing eigenvalue decomposition of the DOA matrix. According to the eigenvalues and eigenvectors with elevation and azimuth information,the DOA of coherent signals could be estimated.The algorithm requires no parameter alignment and 2-D spectrum peak searching.Computer simulation confirms that the proposed algorithm achieved better performance than UCA-VSS algorithm under scenarios of low SNR and deficient snapshots.