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. 28, 2002
Filed:
May. 01, 1998
Eric L. Upton, Redondo Beach, CA (US);
Kenneth L. Brown, Manhattan Beach, CA (US);
Martin P. Smith, Long Beach, CA (US);
Thomas J. Kolze, Phoenix, AZ (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
A method of acquiring a communications signal is provided. The method includes the steps of storing a forward chirp sync segment ( ) of an auto-correlating forward chirp sync ( ) and storing a reverse chirp sync segment ( ) of a symmetric auto-correlating reverse chirp sync ( ). A header comprising of either a forward chirp sync FCS ( ) or a reverse chirp sync RCS ( ), a predetermined number of data blocks comprising a data frame ( ), and the symmetric auto-correlating trailer is received. The header, the data blocks, and the symmetric trailer are susceptible to frequency error. The method correlates the FCS segment ( ) with the auto-correlating FCS ( ) to provide a FCS correlation signal ( ) and correlates the RCS segment ( ) with the auto-correlating RCS ( ) to provide a RCS correlation signal ( ). The method determines the frequency error, symbol timing, and frame timing based upon the FCS correlation signal ( ) and the RCS correlation signal ( ).