Abstract
This paper proposes a modified fast off-grid L1-SVD (M-FOGL1SVD) method for direction of arrival (DOA) estimation. Unlike FOGL1SVD, after obtaining the positions of the nonzero rows of the signal sources, the off-grid overcomplete basis matrix is used to update the signal sources, thus improving the estimation accuracy of it. In addition, to reduce the approximate error of the first-order off-grid model, a second-order off-grid model is introduced through a further Taylor expansion of the steering vector. Finally, the formula for solving the off-grid gap under the novel model is derived. Extensive simulation results indicate that the proposed algorithm has better performance than FOGL1SVD in terms of DOA estimation precision.
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