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:
Dec. 04, 2012
Filed:
Apr. 26, 2010
Stephen J. Stafford, Derwood, MD (US);
Mark S. Asher, Ellicott City, MD (US);
Martin G. Sommerville, Columbia, MD (US);
Lloyd A. Linstrom, Columbia, MD (US);
Thomas L. Kusterer, Elkridge, MD (US);
Stephen J. Stafford, Derwood, MD (US);
Mark S. Asher, Ellicott City, MD (US);
Martin G. Sommerville, Columbia, MD (US);
Lloyd A. Linstrom, Columbia, MD (US);
Thomas L. Kusterer, Elkridge, MD (US);
The Johns Hopkins University, Baltimore, MD (US);
Abstract
Methods and systems to detect navigation signals, including to identify up to multiple range-Doppler hypotheses from each of j range-Doppler correlation grids based on a relatively low first threshold, generate navigation solutions from combinatorial sets of k of the identified hypotheses, evaluate the navigation solutions to identify plausible solutions, iteratively and combinatorially augment the plausible solutions with additional hypotheses from grids that are not represented in the corresponding k-hypotheses based navigation solutions, replace plausible solutions with corresponding augmented plausible solutions when appropriate, and select one of a plurality of plausible solutions as a best plausible solution, j and k being positive integers. Where a grid energy peak exceeds a second threshold, a corresponding hypothesis may be identified as a sole hypothesis for the corresponding navigation signal. The relatively low first threshold permits detection of weaker signals. Subsequent evaluations effectively transform a per-navigation-signal false alarm rate to per-navigation-solution false alarm rate.