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  • Article
  • Open Access

Synthetic aperture technique applied to a multi-beam echo sounder

Earth, Planets and Space201453:BF03352388

  • Received: 1 July 1999
  • Accepted: 21 June 2000
  • Published:


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.


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