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:
Aug. 10, 2010
Filed:
Feb. 29, 2008
Arnold W. Novick, Providence, RI (US);
Michael F. Janik, Portsmouth, RI (US);
Ian B. Kerfoot, Middletown, RI (US);
Mary Kerfoot, Legal Representative, Schaumburg, IL (US);
Arnold W. Novick, Providence, RI (US);
Michael F. Janik, Portsmouth, RI (US);
Ian B. Kerfoot, Middletown, RI (US);
Mary Kerfoot, legal representative, Schaumburg, IL (US);
Raytheon Company, Waltham, MA (US);
Abstract
Systems and methods for detection and analysis of amplitude modulation of underwater sound employ a product of a time delayed first electrical signal with a second electrical signal to generate a summed-product signal. The time delayed first electrical signal and the second electrical signal have an amplitude modulation indicative of characteristics of a vessel propeller. The summed-product signal is analyzed to detect a vessel and to determine the characteristics of the vessel propeller. In some arrangements a plurality of summed-product signals are analyzed to also determine a depth of the detected vessel.