Abstract
Scattering by isolated rock outcrops stand out as prominent features in mid-frequency reverberation measured during KOREX-17, a shallow water experiment conducted off Geoje Island, Republic of Korea, in May 2017. The reverberation data were collected using the Autonomous Reverberation Measurement System (ARMS), a benthic lander with a directional source and receive array mounted on a rotation stage. This stationary system was deployed in roughly the same position on the seafloor over the course of the 9-day experiment. A side-scan sonar survey of the seafloor was conducted to identify the location and rough spatial extend of the exposed portions of the rock outcrops. This talk examines scattering by the rock outcrops as a function of time, signal waveform, and changing oceanographic conditions, with an eye toward detection in clutter environments. Since the ARMS is a fully-calibrated sonar system, with known source level and directivities, the target strengths of the outcrops are also estimated with the long-term goal of developing a scattering model of the most prominent rock outcrop which extends 7-8 m above the seafloor. [Work supported by ONR.]
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