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:
Apr. 06, 2010
Filed:
Sep. 22, 2004
Matthew Rabinowitz, Los Altos Hills, CA (US);
Michael J. Sabin, Sunnyvale, CA (US);
Jimmy K. Omura, San Francisco, CA (US);
Matthew Rabinowitz, Los Altos Hills, CA (US);
Michael J. Sabin, Sunnyvale, CA (US);
Jimmy K. Omura, San Francisco, CA (US);
Rosum Corporation, Sunnyvale, CA (US);
Abstract
The present invention provides a method, system, and apparatus for rapidly acquiring and correlating synchronization codes for a mobile receiver used for position determination purposes. The receiver uses a processing unit to perform the correlation functions. The processing unit first computes, for each segment interval of the received signal, the phase offset of that interval. Each interval is appropriately adjusted to account for the computed phase offset. The processing unit then accumulates the phase-adjusted segment intervals, and may down-convert the accumulated signal to a baseband format from an intermediate frequency. The processing unit then correlates the accumulated signal with a reference signal to produce a correlation peak, from which the time delay of a synchronization code within the interval can be calculated. Ultimately, the receiver's position can be determined based on the calculated time delay.