Linear and circular downscan imaging sonar

  • US 9,223,022 B2
  • Filed: 09/26/2012
  • Issued: 12/29/2015
  • Est. Priority Date: 07/14/2009
  • Status: Active Grant
First Claim
Patent Images

1. A sonar apparatus comprising:

  • a sonar transducer assembly for imaging an underwater environment beneath a watercraft, the sonar transducer assembly comprising;

    a housing mountable to the watercraft;

    a linear downscan transducer element positioned within the housing, the linear downscan transducer element having a substantially rectangular shape configured to produce a fan-shaped sonar beam having a relatively narrow beamwidth in a direction parallel to a longitudinal length of the linear downscan transducer element and a relatively wide beamwidth in a direction perpendicular to the longitudinal length of the transducer element, the linear downscan transducer element being positioned with the longitudinal length thereof extending in a fore-to-aft direction of the housing, wherein the linear downscan transducer element is positioned within the housing to project fan-shaped sonar beams directly beneath the watercraft; and

    a second downscan transducer element positioned within the housing, the second downscan transducer element being configured to produce a generally conical beam that is wider than the fan-shaped sonar beam in a direction parallel to a longitudinal length of the linear downscan transducer element, wherein the second downscan transducer element is positioned within the housing to project conical beams directly beneath the watercraft.

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