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A Method for the Removal of Ray Refraction Effects in Multibeam Echo Sounder Systems
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作者 DING Jisheng ZHOU Xinghua TANG Qiuhua 《Journal of Ocean University of China》 SCIE CAS 2008年第2期233-236,共4页
To a multibeam echo sounder system (MBES), under water sound refraction plays an important role in depth measure- ment accuracy, and errors in sound velocity profile lead to inaccuracies in the measured depth (especia... To a multibeam echo sounder system (MBES), under water sound refraction plays an important role in depth measure- ment accuracy, and errors in sound velocity profile lead to inaccuracies in the measured depth (especially for outer beams). A method is developed to estimate the sound velocity profile based on the depth measured by vertical beam. Using this depth and other pa- rameters, such as t (sound pulse propagation time), θ (beam inclination angle), etc. We can estimate a simple sound velocity profile with which the depth error has been reduced. This method has been tested with a real dataset acquired in the East China Sea. 展开更多
关键词 multibeam echo sounder system acoustic ray refraction equivalent sound velocity profile
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RAY THEORY OF WATER WAVE REFRACTION ON COMPLEX TOPOGRAPHY
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作者 Chen Yao-song Cao Nian-zhemg Department of Mechanics,Peking University,Beijing,P.R.China 《Journal of Hydrodynamics》 SCIE EI CSCD 1989年第2期104-109,共6页
The caustic lines are formed as envelop lines of wave rays on the complex topo- graphy where conventional ray theory fails.By using the inner and outer scale method in the near region the caustic lines the singulariti... The caustic lines are formed as envelop lines of wave rays on the complex topo- graphy where conventional ray theory fails.By using the inner and outer scale method in the near region the caustic lines the singularities of the ray theory are dealt with.Using the conclusion that the phase of the ray in contact with the caustic line increases by π/2,the whole wave refraction problem is solvec except on caustic lines. 展开更多
关键词 LINE ray THEORY OF WATER WAVE REFRACTION ON COMPLEX TOPOGRAPHY
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