Abstract:

A 2-D direction of arrival estimation method for L-shaped array with low computation complexity and high accuracy was presented. Firstly, the subarray cross-correlation matrix of L-shaped array and the conjugate exchange properties of the uniform linear array steering vectors is given, the proposed method extends the array aperture and constructs a new array received data matrix as well. Then the estimations of 2-D angles is obtained with the estimating of signal parameters via rotation invariance techniques algorithm. Finally, the subspace is estimated via applying the Nystöm method to the autocorrelation-like matrix, which is reconstructed by Toeplitzation-the diagonal elements of the subarray cross-correlation matrix without loss of the array aperture. Therefore, the correct angle pairing is achieved with a few angle search. The proposed method does not require massive angle search, and is high in the angle estimation accuracy, low in computation complexity and few in the necessary number of snapshots. Simulation is presented to validate the correction and effectiveness of the proposed method.

Key words: 2-D direction of arrival estimation, L-shaped array, extended aperture, Nystö, m method