High-frequency Reverberation Simulation of High-speed Moving Source in Range-independent Ocean Environment

Abstract

ABSTRACT:In a shallow water waveguide, reverberation signals and their Doppler effects form the primary limitation on sonar system performance. Therefore, in the reverberation-limited environment, it is necessary to estimate the reverberation level to be encountered under the conditions in which the sonar system is operated. In this paper, high-frequency reverberation model capable of simulating the reverberation signals received by a high-speed moving source in a range independent waveguide is suggested. In this model, eigenray information from the source to each boundary is calculated using the ray-based approach and the optimizing method for the launch angles. And the source receiving position changed by the moving source is found by a scattering path-finding algorithm, which considers the speed and direction of source and sound speed to find the path of source movement. The scattering effects from sea surface and bottom boundaries are considered by APL-UW scattering models. The model suggested in this paper is verified by a comparison to the measurements made in August 2010. Lastly, this model reflects well statistical properties of the reverberation signals.

Bistatic reverberation simulation using intersection of scattering cross section between sound source and receiver

“…선 방정식, [3] 정상모드이론, [4][5][6] 음선이론 기반 [7,8] 의 잔향음 모델들이 연구되어졌고, 국내에서는 Kim et al [9] 이 포물선 방정식을 기반으로 천해에서의 양상 태 잔향음 모델을 제안한 이후로 음선이론 [10,11] 과 정 상모드이론 [12,13] 을 을 계산하는 방법도 중요하다. [14] 양상태 산란단면적은 단위 면적에 대해 계산할 경 우, [15] [16] 의 방법과 Weinberg [8] 가 제안한 방법을 사용한다.…”