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3-D Near Field Localization Using Linear Sensor Array in Multipath Environment with Inhomogeneous Sound Speed  

Lee Su-Hyoung (위덕대학교 에너지전기공학부)
Choi Byung-Woong (경북대학교 전자전기컴퓨터학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.25, no.4, 2006 , pp. 184-190 More about this Journal
Abstract
Recently, Lee et al. have proposed an algorithm utilizing the signals from different paths by using bottom mounted simple linear array to estimate 3-D location of oceanic target. But this algorithm assumes that sound velocity is constant along depth of sea. Consequently, serious performance loss is appeared in real oceanic environment that sound speed is changed variously. In this paper, we present a 3-D near field localization algorithm for inhomogeneous sound speed. The proposed algorithm adopt localization function that utilize ray propagation model for multipath environment with linear sound speed profile(SSP), after that, the proposed algorithm searches for the instantaneous azimuth angle, range and depth from the localization cost function. Several simulations using linear SSP and non linear SSP similar to that of real oceans are used to demonstrate the performance of the proposed algorithm. The estimation error in range and depth is decreased by 100m and 50m respectively.
Keywords
3-D localization; Multipath; Inhomogeneous Sound Speed; Linear Array; Ray Propagation Model;
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