Inverse reconstruction of underwater objects based on acoustic scattering

Abstract

The ramp response technique discovers the linear relationship between the ramp response and the profile function of a rigid object, and has been widely used for inverse scattering problems. The main purposes of this study are to improve the existing ramp response technique and to develop new inverse scattering techniques. The effects of aspect ratio and bandwidth on the ramp response have been investigated. The band-limited and bistatic ramp response techniques are developed for shape reconstruction of underwater objects. An inverse scattering procedure for estimating the radius and thickness of a submerged thin shell is proposed. Many numerical simulations and parameter studies have been performed for each inverse scattering method. The numerical results suggest that the ramp response technique and the other inverse scattering techniques presented in this thesis are very effective on determination of the size and shape of underwater objects and easy to implement.