By Sergio Rui Silva

ISBN-10: 3902613483

ISBN-13: 9783902613486

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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. The system complexity stands, therefore, in the digital domain, enabling more flexible and higher quality signal acquisition and processing through this implementation. The use of this technology results in a low power consumption system that fits a small box, compatible with the autonomous boat both in size and energy consumption. The FPGA system is responsible for the generation of complex acoustic signals, for controlling the transmitting power amplifiers and the adaptive gain low noise receiving amplifiers, for demodulating and for match filtering the received signals with the transmitted waveform (Fig.

1998). “DARPA Synthetic Aperture Sonar”, Proceedings of the Adaptive Sensor Array Processing (ASAP) Workshop, vol. 1, pp. 141-155, 15 May 1998. ; Rognstad, M. (1996) “Acoustic Detection and Classification of Burried Unexploded Ordinance (UXO) Using Synthetic Aperture Sonar”, PACON’ 96, 1996. H. , pp. 111-118 Vol. 1, 2005. O. 1-10, Sept. 29 2007-Oct. 4 2007. Sammelmann, G. ; Fernandez, J. ; Christoff, J. T. (1997) “High Frequency / Low Frequency Synthetic Aperture Sonar”, Proocedings of SPIE – International Society for Optical Engineering, vol.

Along/cross track compressed image -5 Along-Track (m) 0 5 10 15 12 14 16 18 20 Cross-Track (m) 22 24 26 Fig. 23. Along/Cross-track compressed reflectivity map an area near the river shore. Along/Cross track compressed image -10 -8 -6 Along-Track (m) -4 -2 0 2 4 6 8 10 12 14 16 18 20 Cross-Track (m) Fig. 24. Reflectivity map of harbour entrance. 22 24 26 Synthetic Aperture Techniques for Sonar Systems 39 The hyperboles are wavy due to the uncontrolled platform motion but, because the platform motion is known, the image nevertheless correctly synthesized.

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Advances in Sonar Technology (2009) by Sergio Rui Silva

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