Broad-band DOA estimation and beamforming in multipath environment

Author

Indukumar, K. ; Reddy, V.

Author_Institution

Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India

fYear

1990

fDate

7-10 May 1990

Firstpage

532

Lastpage

537

Abstract

It is shown that the effective dimension of the signal subspace collapses in the presence of multipath and may be recovered with subarray averaging. The F-norm (Frobenius norm) of the cross-correlation matrix is proposed as a measure of the correlation between the impinging signals, and an upper bound on this norm, which depicts all the essential features of the true F-norm, is derived. Using this bound, how the correlation between the direct and multipath signals falls with progressive smoothing and how the rate is which it falls depends on the spacing and directions of the sources are studied. Computer simulations are provided to support theoretical predictions. To keep the notation and the analysis simple, the analysis was restricted to two-source models; however, the results extend to signal models with more than two sources

Keywords

antenna radiation patterns; correlation theory; electromagnetic wave propagation; signal detection; Frobenius norm; beamforming; broadband; broadband DOA estimation; computer simulations; cross-correlation matrix; direct signals; multipath environment; multipath signals; signal models; signal subspace; subarray averaging; two-source models; upper bound; Array signal processing; Covariance matrix; Decorrelation; Delay; Direction of arrival estimation; Jamming; Narrowband; Sensor arrays; Smoothing methods; Upper bound;

fLanguage

English

Publisher

ieee

Conference_Titel

Radar Conference, 1990., Record of the IEEE 1990 International

Conference_Location

Arlington, VA

Type

conf

DOI

10.1109/RADAR.1990.201086

Filename

201086