Title :
Nusty bias effects of the cross spectral matrix when detecting target in presence of strong jammers
Author_Institution :
Thomson-Sintra ASM, Cagnes-sur-Mer, France
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;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.116221
