Numerical analysis for source direction finding using a cylindrical array with scattered sound fields

Abstract

Numerous studies on beamforming techniques have been done for source direction finding using various types of arrays. A circular array as well as a linear array is also widely used for its compact configuration and smaller angular dependency of beamforming performance. In underwater environments a circular array faces high drag forces due to not only ocean current but also its moving platform. One of the solutions may be an array of hydrophones flush mounted on a cylindrical structure to reduce the drag. However this configuration causes sound scattering, which deteriorate the pressure distribution based on the free field condition. This talk deals with numerical approach for source localization techniques with scattered sound fields. Parametric study shows that beamforming performance is improved and relative high resolution can be achieved using an array of small-sized aperture.