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:
Nov. 30, 1999
Filed:
Nov. 06, 1997
Khiem V Cai, Brea, CA (US);
Steven R Severance, Yorba Linda, CA (US);
Raytheon Company, Lexington, MA (US);
Abstract
The present invention is a method of synchronizing a digital receiver to a digital transmitter in both frequency and time using a novel ambiguity transformation. The ambiguity transform combines time correlation and spectrum synchronization into an integrated two-dimensional transform process. The ambiguity transform includes the steps of multiplying a reference sequence with a received signal to create a product signal, calculating the magnitude of the spectrum of the product signal, and determining the peak product signal. Through multiple iterations of the ambiguity transform, and time and frequency shifts, a digital receiver may be synchronized to a digital transmitter. The method of the present invention may be implemented using a digital signal processor (DSP).