Low Complexity Acoustic Imaging System Based on Time of Arrivals Dynamic Estimation
Résumé
This paper addresses the problem of underwater imaging using a low complexity acoustic imagery system for various applications (i.e., immerged object localization, underwater surveillance, ocean sciences, etc.). When it comes to design a typical acoustic imaging system using multi element arrays aimed to provide high resolution images, the main principles involved are the interferometry or adaptive beamforming both of them based on phase measurements. The platform caring the acoustic imaging system must be perfectly stabilized in order to ensure an accurate imaging process. The stabilization issues are very important and current techniques employs sophisticated system, based on gyroscopes, inertial devices, etc. In this paper a simple imaging method is proposed based on acoustic sensors and the accurate estimation of the time of arrivals of the waves reflected by different scattering points of the object.