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By Edited by: Sergio Rui Silva

ISBN-10: 3902613483

ISBN-13: 9783902613486

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The result is a faster progression through the solution surface, with lower probabilities of falling into local minima. 35 Synthetic Aperture Techniques for Sonar Systems (Sub-band Auto-focus / Step 1) (Sub-band Auto-focus / Step 2) 18 20 22 24 Cross-Track (m) 26 -5 Along-Track (m) 0 5 16 (Sub-band Auto-focus / Step 3) -5 Along-Track (m) Along-Track (m) -5 0 5 16 18 20 22 24 Cross-Track (m) 26 0 5 16 18 20 22 24 Cross-Track (m) 26 Fig. 17. Sonar image of the artificial target through the various auto-focus steps.

4) and the Principle of Stationary Phase ([Gough, P. T. (1998)]). The image reconstruction task can, as a result, be done by multiplication of the frequency domain inverse sonar imaging model. 8) The array spacing from Nyquist spatial sampling and classical array theory is λ/2 (two way equivalent 2π phase shift), which means that for angles of arrival of a wave-front the interelement phase difference must be less than 2π ([McHugh, R. et al (1998)]). This is also true for motion errors. To correctly form a synthetic aperture the platform position must be known within 1/8 of a wavelength so the echoes can be coherently combined with negligible image deterioration ([Cutrona, L.

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. 8). The first task of the FPGA is therefore to control the digital-to-analog (D/A) and analog-todigital interface (A/D).

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Advances in Sonar Technology by Edited by: Sergio Rui Silva

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