Broadband DOA estimation using frequency invariant beamforming

• Published in: IEEE transactions on signal processing Vol. 46; no. 5; pp. 1463 - 1469
• Main Authors: Ward, D.B., Ding, Zhi, Kennedy, R.A.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.1998; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Array signal processing; Covariance matrix; Detection, estimation, filtering, equalization, prediction; Direction of arrival estimation; Equations; Exact sciences and technology; Frequency estimation; Information, signal and communications theory; Linear systems; MIMO; Signal and communications theory; Signal, noise; System identification; Telecommunications and information theory; Time domain analysis; Transfer functions; Spatial frequency filtering; Parameter estimation; Wide band signal; Arrival angle; Signal estimation; Signal processing; Finite impulse response filter
• ISSN: 1053-587X; 1941-0476
• DOI: 10.1109/78.668812

A new method of direction-of-arrival (DOA) estimation for multiple broadband farfield signals is presented. The technique uses a beamspace preprocessing structure based on frequency invariant beamforming. Specifically, a set of beam-shaping filters focus the received array data in the time domain, thereby avoiding the need for frequency decomposition. Hence, the proposed method is conceptually different from most other broadband DOA estimators, which require frequency decomposition. Numerical results are presented to demonstrate the use of the new method and compare it with conventional coherent signal subspace methods.