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    • Calibration sphere for low-frequency parametric sonars 

      Foote, Kenneth G.; Francis, David T. I.; Atkins, Philip R. (Acoustical Society of America, 2007-03)
      The problem of calibrating parametric sonar systems at low difference frequencies used in backscattering applications is addressed. A particular parametric sonar is considered: the Simrad TOPAS PS18 Parametric Sub-bottom ...