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access icon free Two-dimensional DOA estimation for L-shaped array with nested subarrays without pair matching

© The Institution of Engineering and Technology
Received 18/06/2015, Accepted 08/07/2016, Revised 12/06/2016, Published 13/07/2016

Non-uniform L-shaped array consisting of two nested arrays and its computationally efficient two-dimensional direction-of-arrival (DOA) estimation method are developed in this study. The basic idea of the proposed method is to utilise the property of nested arrays and the conjugate symmetry property of the signal auto-correlation function for different time lags to construct a conjugate augmented spatial–temporal cross-correlation matrix (CAST-CCM) and form joint diagonalisation structure from the signal subspace corresponding to the CAST-CCM. Hence, the DOAs are estimated and paired automatically via signal subspace joint diagonalisation technique. The proposed method can handle underdetermined DOA estimation with automatic matching and deal with the angle ambiguity problem when multiple sources have the same azimuth or elevation angles. Meanwhile, the proposed method is computationally efficient without multidimensional search. The effectiveness of the proposed method is verified through computer simulations.

Inspec keywords: array signal processing; matrix algebra; correlation methods; direction-of-arrival estimation

Other keywords: 2D direction-of-arrival estimation method; nonuniform L-shaped array; underdetermined DOA estimation; conjugate symmetry property; time lags; azimuth angle; 2D DOA estimation method; computer simulations; CAST-CCM; elevation angle; signal autocorrelation function; nested subarrays; conjugate augmented spatial-temporal cross-correlation matrix; angle ambiguity problem; signal subspace joint diagonalisation technique; nested arrays; automatic matching

Subjects: Algebra; Signal processing and detection; Algebra; Signal processing theory; Digital signal processing

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