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The indigenously developed SONAR operates in the frequency band of 2- 24 kHz. The SONAR consists of hardware for signal generation, data acquisition and signal conditioning circuits. Wideband transmitter array and a planar hydrophone array are employed to transform electrical signals into pressure waves and vice versa respectively. All the hardware units, transmitter array and receiver array are housed in a floating tow body and towed at a speed of 2- 3 knots. A separate industrial computer is employed to receive the signals in digitized format over Ethernet cable. Suitable signal processing algorithms are implemented to detect the hidden/ submerged partially in water / proud targets and a vertical cross section of sea bed image is generated. Experiments were carried out at Royapuram off Chennai coast, India.A ship wreck was detected while surveying. The sunken ship had a length of approximately 70 m and a width of 20 m approximately. The present work analyse the received signals from a sunken ship and the sediment which were captured by the SONAR. The power signal density at 11.4 kHz for sediment and sunken ship is -44 dB/Hz and -46 dB/Hz respectively. Further analysis will be published elsewhere.
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