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Improved maximum likelihood spectrum for direction of arrival (DOA) estimation

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2 Author(s)
Naidu, P.S. ; Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India ; Krishna, V.V.

A variation of J. Capon's (1969) maximum-likelihood (ML) spectral estimation algorithm is described for calculating direction of arrival using a short linear array. The proposed modification involves altering the computed covariance spectral matrix by setting its lowest eigen value to a small, positive constant λ'(min). Theoretical analysis indicates that as λ'(min) is reduced, the improved ML spectrum tends towards the Pisarenko estimate (1972), thereby attaining a higher resolution than Capon's original ML technique while at the same time retaining its robustness. Simulation results for an eight-element array are provided to illustrate the performance of the IML spectrum in resolving two incoherent sources in the presence of background noise

Published in:

Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on

Date of Conference:

11-14 Apr 1988