Fig. 5. Azimuthal distributions of the sound pressure level for different frequencies received at the center of the circles.
4. CONCLUSIONS
To develop the real-time ocean acoustic survey technology by using OAT system in deep water, explosive source has been deployed from the aircraft to survey a medium scale basin. The SUS, which may be not repeatable source in terms of explosion and subsequent bubble pulse, produced a peak signal that was easily detected by the VLA. Furthermore, the exact explosion time and depth of the charges could be determined by the empirical formula and the sonobuoy receiver which was placed within the direct-path zone. In conclusion, present experiments have been successful to locate the position of warm eddy and its temperature field in the East Sea of Korea.
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