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High resolution sub bottom profiling is very much important for identification of closely spaced sea bed layers and objects buried under the sea bed. The vertical range resolution of sub bottom profilers depends on the band width of the sonar. As the band width increases, the vertical range resolution increases. So narrow band systems have limitations in performance in identification of closely spaced sea bed layers and sub sea bed objects. National Institute of Ocean Technology (NIOT) has indigenously developed a wide band sub bottom profiler which has detected multiple sea bed layers and also objects like partially / completely buried stones, which has sizes of the order of a few centimeters. The enhancement in resolution is due to the realization of bi-static wide band width of the sonar system whose frequency could be varied from 2- 24 kHz. All the subsystems of the sonar like wide band acoustic transmitter, hydrophone arrays, front end electronic subsystems and signal processing algorithms are indigenously developed. The developed system can generate sub bottom profiles in real time. This paper reports the performance evaluation of the developed sonar for identification of sea bed layers and buried objects in Royapuram harbor area, Chennai.
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