표면반사파가 존재하는 무향수조 내에서 빔형성기법 및 음향홀로그래피의 적용

Abstract

Recently, our institute, KRISO/KORDI constructed a small anechoic tank which has anechoic lining at the four walls and bottom. Because surface reflections still occur, special care must be taken for acoustic measurements and array signal processing, for example, source localization and acoustic holography. In this paper the effects of the surface reflections to the array signal processing methods are investigated. Firstly, estimated errors by both methods are analyzed for various measurement parameters. Beamforming experiments with vertical line arrays are performed. Holographic reconstruction of simple and complex acoustic sources is also performed to compare the true and estimated results.