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3D high resolution sub-bottom imaging: 3D Chirp
Gutowski, M.; Bull, J.M.; Dix, J.K.; Henstock, T.J.; Hogarth, P.J.; Hiller, T.; Leighton, T.G. (2006). 3D high resolution sub-bottom imaging: 3D Chirp, in: Evolutions in hydrography, 6th - 9th November 2006, Provincial House Antwerp, Belgium: Proceedings of the 15th International Congress of the International Federation of Hydrographic Societies. Special Publication (Hydrographic Society), 55: pp. 153-157
In: (2006). Evolutions in hydrography, 6th - 9th November 2006, Provincial House Antwerp, Belgium: Proceedings of the 15th International Congress of the International Federation of Hydrographic Societies. Special Publication of the Hydrographic Society, 55. International Federation of Hydrographic Society: London. 234 + cd-rom pp., more
In: Special Publication (Hydrographic Society). Hydrographic Society: London. ISSN 0309-8303, more

Available in Authors 
Document type: Conference paper

Keywords
    Acoustic equipment; Imaging techniques; Sub-bottom profiling

Authors  Top 
  • Gutowski, M.
  • Bull, J.M.
  • Dix, J.K.
  • Henstock, T.J.
  • Hogarth, P.J.
  • Hiller, T.
  • Leighton, T.G.

Abstract
    Chirp sub-bottom profilers are marine acoustic devices that use a known and repeatable frequency-modulated source signature to produce vertical seismic reflection cross-sections of the sub-seabed. Here a 3D Chirp system is described that operates in the frequency range of 1.5 to 13kHz, to produce a threedimensional image of the sub-seabed with typical penetration of 10 - 30m and decimetric horizontal and vertical resolution. The design incorporates a rigid frame that contains the Chirp source array together with 60 receiver elements, with positioning provided by an integrated Real-Time-Kinematic (RTK) Global Positioning System (GPS) together with a GPS based attitude system. The array can be surface towed from a small survey vessel and applied to targets of marine geological, engineering, archaeological and defence interest. The capabilities of the system to image sub-surface structures and buried objects is demonstrated in two data-examples imaging a buried engineering object in the Port of Southampton, UK and a buried wooden ship-wreck in the river Hamble, Bursledon, UK.

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