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. 18, 1993
Filed:
Nov. 09, 1990
Michael R Layton, Clayton, CA (US);
Litton Systems, Inc., Woodland Hills,, CA (US);
Abstract
An improved synthetic heterodyne demodulator circuit. The circuit is arranged to accept the output signal s(t) from an interferometric sensor with large amplitude sinusoidal phase modulation (phase-generated carrier). The phase modulation amplitude is adjusted such that a selected pair of odd and even carrier harmonics are equal. The quadrature signal components are first extracted from the phase-generated carrier using standard homodyne techniques. The quadrature signal components are then used to AM-modulate a pair of equal-amplitude quadrature carrier components at an arbitrary frequency .omega..sub.c, and summed. The result is a conventional PM modulated carrier which can be demodulated using standard FM techniques, followed by integration, to recover with high fidelity the sensed information.