Title :
Real- and synthetic-array signal processing of buried targets
Author :
Pinto, Marc A. ; Bellettini, Andrea ; Hollett, Reginald ; Tesei, Alessandra
Author_Institution :
SACLANT Undersea Res. Centre, La Spezia, Italy
fDate :
7/1/2002 12:00:00 AM
Abstract :
Results from two field experiments aimed at investigating the detection and classification of buried targets are presented. In both experiments a 2-16-kHz parametric source was used. In the first experiment, the source was used in combination with a 12-m horizontal line array and in the second with a 1.4-m vertical line array which was displaced horizontally along an underwater rail to form a 10 m × 1.4 m two-dimensional synthetic aperture sonar (SAS). To increase the SAS integration time, the parametric source was electronically scanned in azimuth during the displacement along the rail, as in spotlight mode. It is shown that both arrays allow important signal-to-reverberation gains, enhancing the detection of sub-bottom echoes. A new, environmentally adaptive, matched filter which further improves the signal to reverberation ratio while allowing discrimination between proud and buried targets is presented and validated experimentally. The use of resonant scattering for target classification of buried objects is discussed, in the particular case of spherical shells.
Keywords :
acoustic filters; adaptive filters; buried object detection; matched filters; sonar arrays; sonar signal processing; synthetic aperture sonar; 2 to 16 kHz; adaptive matched filter; buried target classification; buried target detection; electronic scanning; horizontal line array; parametric source; real-array signal processing; resonant scattering; signal-to-reverberation ratio; spherical shell; spotlight mode; sub-bottom echo detection; synthetic-array signal processing; two-dimensional synthetic aperture sonar; vertical line array; Array signal processing; Azimuth; Buried object detection; Matched filters; Rails; Resonance; Reverberation; Scattering; Signal processing; Synthetic aperture sonar;
Journal_Title :
Oceanic Engineering, IEEE Journal of
DOI :
10.1109/JOE.2002.1040932