By Edited by: Sergio Rui Silva
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Additional info for Advances in Sonar Technology
2007a)]) is constituted by a control base station, a surface craft and the sonar itself (Fig. 1). Because of its size and modular construction, this setup is easily portable and has low deployment time. The boat it self is modular and easy to assemble in site without the need of any special tools. The sonar platform is an autonomous boat (Fig. 2). This is a small catamaran like craft, proving high direction stability, smooth operation and several hours of unmanned operation, which can be command manually from the base station or fulfil a pre-defined mission plan.
6. Sonar signal generation and acquisition system. Synthetic Aperture Techniques for Sonar Systems 23 Fig. 7. Sonar schematic system overview. This greatly simplifies the electronic hardware at the cost of more complex digital signal operations and hardware. But these in turn are powerfully performed in an field programmed array system (FPGA), providing a low cost solution. A FPGA is a device that enables the implementation of customized digital circuits. This device can perform several tasks in parallel and at high speed.
Because we are interested in shallow water surveys, short ranges enable higher pulse rates. Nevertheless, because of the broad beam-width of the transducer and its effective diameter, a pulse rate of 15 Hz still imposes very low moving speeds to the autonomous boat (0,16 m/s) that in turn has to couple with higher precision trajectory tracking constrains. Each receiving channel has a low noise amplifier and a controllable gain amplifier to handle the high dynamic range of echo signals. The pre-amplifier system has a bandwidth of 10 MHz, a noise figure of 2 dB and a 50-115 dB gain range.
Advances in Sonar Technology by Edited by: Sergio Rui Silva