A high resolution sonar for sea-bed imaging |
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| Authors: | J. Dybedal A. Løvik K.A. Ingebrigtsen |
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| Affiliation: | Bentech A/S, Fiolveien 15, PO Box 3050, 9001 Tromso, Norway;ELAB. The Norwegian Institute of Technology, The University of Trondheim, N-7034 Trondheim, Norway |
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| Abstract: | A sonar system for making three-dimensional topographic images of the sea-bed is described. The system applies a sectorial scan within each range cell by electronic beam forming. It is designed to resolve 128 beams each separated by 0.5° to cover a 64° sector. The beam forming is facilitated by a real-time Fourier transform of the signal samples from the multielement receiving transducer array. The Fourier transform is implemented as a chirp transform using surface acoustic wave reflective array devices.The design and measured performance of the transducers, and the beam former are discussed in some detail. |
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| Keywords: | sonar linear arrays signal processing |
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