Autofocusing a synthetic aperture sonar using the temporal and spatial coherence of seafloor reverberation
An autofocusing algorithm for the compensation of translational motion errors of a sea floor rmaging synthetic aperture side scan sonar is presented. The algorithm does not depend on the presence or absence of dominant scatterers in the field of view and is based on the displaced phase center antenna concept. The theoretical performances are studied and the algorithm is shown to perform satisfactorily on stmulated data. Preliminary results obtained for a sonar moving on an underwater rail are presented. Sea trials are planned to validate an extension of the algorithm, termed "multibeam interferometry", to arbitrary motion errors.
SourceIn: High Frequency Seafloor Acoustics (SACLANTCEN Conference Proceedings CP-45), 1997, pp. 417-424
Pinto, Marc A.;