Adaptive beamforming: spatial filter designed blocking matrix

Author

Nordebo, Sven ; Claesson, Ingvar ; Nordholm, Sven

Author_Institution

Dept. of Telecommun. Theor., Lund Univ., Sweden

Volume

19

Issue

4

fYear

1994

fDate

10/1/1994 12:00:00 AM

Firstpage

583

Lastpage

590

Abstract

Controlling the resolution in adaptive beamformers is often crucial. A simple method that works for both narrow-band and broad-band arrays is presented. This method is based on the normalized leaky LMS algorithm in conjunction with a generalized sidelobe canceller (GSC) structure, where the GSC is designed using a spatial filtering approach. In essence, the suppression of the spatial filters and the implicit noise of the leaky LMS algorithm together determine the adaptive beamformer. Analytical expressions are given for the Wiener filters and the output spectrum versus frequency and point source location. These expressions are employed in the design specification of the spatial filters and to obtain conditions for a controlled quiescent beamformer response. Simulation results are presented to illustrate the behavior of the array

Keywords

Wiener filters; array signal processing; digital simulation; least mean squares methods; spatial filters; Wiener filters; adaptive beamforming; blocking matrix; broad-band arrays; controlled quiescent beamformer response; generalized sidelobe canceller; implicit noise; narrow-band arrays; normalized leaky LMS algorithm; output spectrum; point source location; resolution; spatial filter; spatial filtering; spatial filters; suppression; Adaptive control; Algorithm design and analysis; Array signal processing; Filtering algorithms; Least squares approximation; Narrowband; Programmable control; Spatial filters; Spatial resolution; Wiener filter;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/48.338394

Filename

338394