Synthetic Aperture Sonar Beam Forming in the Presence of Internal Waves
1998
Johnson, Larry V. | Eisenberg, Joshua
The long term goal of our research is to incorporate environmental estimation and compensation methods into the synthetic aperture sonar (SAS) image formation process. Specifically mitigate shallow water environmental effects causing a degradation in image resolution through space/time variations in the sound speed field, e.g., internal waves, turbulence, bathymetry. The current focus of our research is to develop an algorithm to compensate for the effects of linear internal waves during the formation of a synthetic aperture in a shallow water environment. Internal waves impact the propagation of the acoustic signal and consequently the phase by changing the space time structure of the sound speed field. Our intent is to model this phase change due to internal waves, with the challenge of developing a methodology to remove this internal wave induced phase variation as a part of the formation of the synthetic aperture.
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