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:
Feb. 29, 2000
Filed:
Nov. 19, 1998
Mark L Fowler, Ithaca, NY (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
A method for demodulating digital frequency modulation (FM) signals is disclosed. A group of complex-valued discrete-time FM signal samples is initially received. A corresponding first complex product for each of the complex-valued discrete-time FM signal samples is computed, and a corresponding second complex product for each of the first complex values of the complex-valued discrete-time FM signal samples is computed. Subsequently, an inverse tangent of the second complex products are computed to yield an angle for each of the second complex values, wherein each of the angles represents a second-order difference of a phase of the complex-valued discrete-time FM signal samples. Finally, a digital integration is performed to obtain a first-order difference of the phase of the complex-valued discrete-time FM signal samples.