Feasibility of Littoral Imaging with a 3 Khz Synthetic Aperture Sonar
The feasibility of using a 3 kHz surface ship bow sonar as a synthetic aperture sonar (SAS) for imaging targets in shallow water is presented. The study consists of modelling the environment with a time-varying ocean surface; a downward refracting sound velocity profile; and bottom roughness, penetration and scattering. Targets placed in the model include both a point target to simulate a mine and confirm imaging resolution, and an array of point targets to simulate the length extent of a submarine. The multipath returns were then processed by standard side-scan sonar (SSS) methods and SAS methods. Replica processing (matched filtering) was employed to improve imaging. Useful SAS imaging is shown.
KeywordsGlobal Position System Linear Frequency Modulate Ship Motion Differential Global Position System Sonar Image
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