표면반사파가 존재하는 무향수조 내 근접장에서의 음원위치추적

Abstract

In order to apply the conventional beamforming algorithms, experiments should be performed in anechoic environments, because they are derived based on the assumption of no reflections. Although KRISO/KORDI has an underwater anechoic basin, it has a free surface that reflects sound waves. Because the acoustic impedance of water is several thousand times bigger than that of air, it is reasonable to assume that it is pressure release condition. In this paper a source localization method in such a kind of environment is studied. The effect of frequency and hydrophone position is analyzed. Form the results it is found that reflection effect needs not to be considered if the array aperture is larger than 2.5 times of the wavelength.