Abstract
This paper considers the problem of DOA (direction-of-arrival) estimation for multiple uncorrelated plane waves incident upon so-called fully-augmentable sparse linear arrays. When the number of waves, m, is less than the number of antenna sensors, M, a new approach is presented which constructs a full-sized positive definite (p.d.) Toeplitz matrix from the M/spl times/M direct data covariance matrix R/spl circ/. Alternating projections are then applied to find a p.d. Toeplitz matrix with truncated signal subspace. When m/spl ges/M, direct augmentation is used to form an initial Toeplitz estimate which is then treated as in the previous case. Results on simulated data demonstrate that this new approach has superior DOA-estimation performance compared with existing methods.
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