Gvozdeva I. Methods and tools for modelling of processes of forming and spatial-time processing of acoustic images

The object of investigation: acoustic fields, the processes of their interaction with complex surfaces and propagation in a heterogeneous media,acoustic coherent images forming and processing. The thesis aim: creation of methods and tools for mathematical and computer simulation of images forming and spatial-time processing in acoustic probing systems by increasing their resolution. Investigation methods: theory of wave fields, acoustics, theory of wave propagation in laminated-heterogeneous media, the methods of signal processing and organization of full-scale experiments. Scientific novelty: a new approach to improve the quality of images in acoustic probing systems is proposed; the mathematical models of secondary acoustic fields of complex scattering surfaces are developed; the adequacy of the developed mathematical model of secondary acoustic field mirror component is experimentally confirmed, the scattering function of complex surfaces is created; the method of weighted multiplicative signal processing in receiving phased arrays of different configurations is proposed and their direction characteristics are defined; the estimation means of refraction influence on the formation of coherent acoustic images and multipath influence on the results of their spatial-time processing are proposed. The significance of practical results: the creation of models and methods for forming and processing the acoustic coherent images, software simulation. Results are introduced in Public Corporation "Element", Odessa State Environmental University, Odessa National Polytechnic University. The results can be used to create acoustic probing systems and in the education.