Long-range cw and time-domain simulations of ocean acoustic scatter from Mid-Atlantic Ridge corners

Stanley A. Chin-Bing; David B. King; Joseph E. Murphy; Gongqin Li

doi:10.1117/12.181045

29 July 1994 Long-range cw and time-domain simulations of ocean acoustic scatter from Mid-Atlantic Ridge corners

Stanley A. Chin-Bing, David B. King, Joseph E. Murphy, Gongqin Li

Proceedings Volume 2234, Automatic Object Recognition IV; (1994) https://doi.org/10.1117/12.181045
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

Long-range acoustic experiments done in the mid-Atlantic ridge region show strong backscatter from many ocean bottom features. One type of feature characteristic of this region, and a possible contributor to this acoustic backscatter, takes the form of a seafloor ridge corner formed by two ridge faces intersecting at near-right angles. We have investigated through computer simulations the effects of an anelastic seafloor corner on the backscattered acoustic field. The acoustic source insonifying the seafloor corner was near the sea surface and approximately 4 km away in range. The ocean depth at the seafloor corner was also 4 km. Simulations were made using cw computer models. Time-domain calculations were obtained from FFTs of the cw fields. Examples are presented that show large backscatter near the base of the ridge while relatively low backscatter near the ridge peak. This is attributed to the angle of the insonifying field and multiple scattering effects. Backscatter from a longer range (10 - 20 km), gently sloped sedimented seafloor is also presented and discussed.

Citation Download Citation

Stanley A. Chin-Bing, David B. King, Joseph E. Murphy, and Gongqin Li "Long-range cw and time-domain simulations of ocean acoustic scatter from Mid-Atlantic Ridge corners", Proc. SPIE 2234, Automatic Object Recognition IV, (29 July 1994); https://doi.org/10.1117/12.181045

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