Abstract:

To further improve the degrees of freedom and resolution of separated coherent arrays, a novel separated nested array is proposed. The nested arrays are used as the subarrays of the separated array. Based on the Khatri-Rao product, the nested subarrays can improve the degrees of freedom of the separated nested array. The separated nested array possesses large aperture and high resolution with low hardware cost and improves direction of arrival(DOA)estimation accuracy. The spatial smoothing unitary estimation of signal parameters via rotational invariance techniques(ESPRIT)based on the Khatri-Rao product is proposed to implement the DOA estimation. The covariance matrix is vectorized to improve the degrees of freedom and the spatial smoothing is used to build up the rank of the new covariance matrix, and then the DOA estimation is obtained using the dualsize unitary ESPRIT algorithm. Simulation results are given to verify the effectiveness of the proposed method.