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Synthetic aperture technique applied to a multi-beam echo sounder


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.


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Correspondence to Akira Asada.

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Asada, A., Yabuki, T. Synthetic aperture technique applied to a multi-beam echo sounder. Earth Planet Sp 53, 321–326 (2001).

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  • Hydrophone
  • Beam Signal
  • Hydrophone Array
  • Projector Array
  • Hydrophone Data