Kurskyi Y. Improvement of hydroacoustic measurement accuracy in dynamic conditions

Purpose: development of physical foundations of hydroacoustic methods measurement for objects direction and speed for improvement of hydroacoustic measurement accuracy in dynamic conditions. Object: the process of sonar measurements in dynamic conditions. Subject: the physical fundamentals of sonar measurements of objects speed and direction motion. Methods: main provisions of the metrology, fundamentals of acoustics and underwater acoustics, field theory, solid state physics, fluid mechanics, the theory of processing sonar signals; methods of mathematical and theoretical physics, mathematical analysis, analytical geometry, mathematical and computer modeling. Analytical dependences of angular and frequency parameters of reflected and refracted waves on parameters of solid movement are found in the ray approximation. It is showed that during a solid movement reflection and refraction angles are differ from the angles that Snelius law gives; the frequencies reflected and refracted waves are differ from frequencies that classical Doppler effect gives. The multiposition hydroacoustic system for definition of spatial co-ordinates, speed and directions of objects movement are investigated. The regular errors during use of classical formulas for Snelius law and Doppler effect are calculated. The measurements equations and step by step information algorithms of measurement of speed and direction of objects movement with use of the described acoustic effects for multiposition hydroacoustic system is developed. They can fall regular errors of measurement.