Nusty bias effects of the cross spectral matrix when detecting target in presence of strong jammers

Author

Maguer, Alain

Author_Institution

Thomson-Sintra ASM, Cagnes-sur-Mer, France

fYear

1990

fDate

3-6 Apr 1990

Firstpage

2855

Abstract

The deleterious bias effects of the cross-spectral matrix when detecting target in presence of noise and strong jammers are shown. A theoretical study of this phenomenon is performed using elementary perturbation theory in order to determine spectral and spatial property of the ghost targets generated by this bias decoherency. The influence of this feature is then analyzed for adaptive and null steering beamforming. The performance of adaptive beamforming is significantly better and greatly improved when all the sensor signals are phased in the jammer direction

Keywords

acoustic noise; jamming; perturbation theory; underwater sound; bias decoherency; cross spectral matrix; deleterious bias effects; elementary perturbation theory; ghost targets; noise; null steering beamforming; sensor signals; strong jammers; Acoustic sensors; Adaptive arrays; Array signal processing; Eigenvalues and eigenfunctions; Frequency estimation; Jamming; Position measurement; Propagation delay; Sensor phenomena and characterization; Signal processing; Visualization;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on

Conference_Location

Albuquerque, NM

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1990.116221

Filename

116221