Abstract
We are developing a synthetic aperture technique using a Sea Beam 2000 multi-beam echo sounder to observe subsea crustal movements for earthquake studies. Augmented by the Kinematic GPS and a motion sensor, the synthetic aperture technique was successfully applied to the Sea Beam 2000 with a 12 kHz frequency acoustic signal. The 4.3-meter long projector produces a transmission fan beam in alongtrack beamwidth of 2 degrees, but a synthesis of the data achieved about 37 m aperture length, equivalent to a 0.3 degrees alongtrack beamwidth. Bathymetry measurements at the water depth of 900 m obtained through the synthetic aperture processing show considerable improvement of the signal-to-noise ratio and reveal detailed features of the seafloor.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Asada, A., Sea Beam 2000: Bathymetric surveying with interferometry, Sea Technology, 33(6), 10–15, 1992.
Asada, A. and T. Ueki, Synthetic aperture analysis using a multibeam echo sounder, J. Acoust. Soc. Jp., (E), 19(4), 259–268, 1998.
Capell, W. J. and K. C. Kiesel, An extend capability multibeam bathymetric mapping system, IEEE Conf. Proceedings of OCEANS’89, 1124–1136, 1989.
Cutrona, L. J., A comparison of sonar system performance achievable using synthetic aperture techniques, J. Acoust. Soc. Am., 58(2), 336–348, 1975.
Glen, M., Introducing an operational multi-beam array sonare, International hydrographic Review, XLVII(1), 35–39, 1970.
Leick, A., GPS Satellite Surveying, 2nd ed., Chap. 10, pp. 380–381, John Wiley & Sons, New York, 1995.
Massonnet, D., M. Rossi, C. Carmona, F. Adragna, G. Peltzer, K. Feigl, and T. Rabaute, The displacement field of the Landers earthquake mapped by radar interferometry, Nature, 364, 138–142, 1993.
Spiess, F. N. and V. C. Anderson, Wide swath precision echo sounder, U. S. Patent, 4, 400, 803, 1983.
Stubbs, A. R., B. S. McCartney, and J. G. Legg, A method of wide swath depth measurement, International hydrographic Review, LI(1), 23–59, 1974.
Talukdar, K., W. Capell, and C. Zabounidis, Sidescan survey results from a multibeam sonar system—SEA BEAM 2000, Marine Geodesy, 15, 63–79, 1992.
USC and GS scientific and Technical Publications Group, Narrow beam transducer sounding system yields excellent results in operation aboard U.S.C. and G.S. ship Surveyor, International hydrographic Review, XLIII(1), 37–42, 1966.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Asada, A., Yabuki, T. Synthetic aperture technique applied to a multi-beam echo sounder. Earth Planet Sp 53, 321–326 (2001). https://doi.org/10.1186/BF03352388
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1186/BF03352388