The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2013
Filed:
Nov. 16, 2011
Eric Hallenborg, San Diego, CA (US);
Heidi Buck, San Diego, CA (US);
John Stephen Degrassie, San Diego, CA (US);
Eric Hallenborg, San Diego, CA (US);
Heidi Buck, San Diego, CA (US);
John Stephen deGrassie, San Diego, CA (US);
The United States of America as Represented by the Secretary of the Navy, Washington, DC (US);
Abstract
Systems and methods for determining the speed of a vessel from an overhead image of the vessel's wake can include the initial step of defining a cusp line for the wake. A representative line segment from the defined cusp line that is suitable for building an image intensity profile for the image can be selected. Once the intensity profile is built along the line segment, the wake wavelength λfrom the image intensity profile can be found by measuring the distance between successive points of intensity maxima (or successive intensity minima points) along the line segment. Once λis found, the vessel speed can be determined from the images according to the formula ν=√{square root over (1.352*λ)}. The systems and methods can be practiced using any overhead imagery systems that display a vessel's wake, including synthetic aperture radar (SAR) and electro-optical (EO) overhead imagery systems.