Reference oscillator frequency correction system

Abstract

A receiver reference oscillator frequency correction system and method are described that provides a receiver with a greater ability to lock onto relatively weak radio frequency signals by determining and estimating an amount of frequency error in a local frequency reference of the receiver, and using the error estimate to maintain frequency coherence with a received signal, thereby allowing tracking over a longer period of time, enabling longer integration times to capture weaker signals without losing frequency coherence.

Description

[0001] Cross reference of related applications [0002] This application requires as the continuation-in-part of U.S. Patent No. 10 / 885,507 filed on July 3, 2004, named "Aided Location Communication System", filed on November 24, 2004, with the name The priority of U.S. Non-Provisional Patent Application No. 10 / 997,797 for "FREQUENCYPHASE CORRECTION SYSTEM" is hereby incorporated by reference into this application in its entirety. The application is: [0003] (a) The continuation of the PCT application No. PCT / US03 / 16308 filed on May 22, 2003 and titled "Aiding in a Satellite Positioning System", which was filed on May 22, 2002 under the title "A Method of Aiding a Global Positioning System" U.S. Patent Application No. 10 / 155,614 (now U.S. Patent No. 6,684,158), which was filed on February 28, 2001 under the title "Information Transfer in a Multi-mode Global Positioning System Used with Wireless Networks" U.S. Patent Application No. 09 / 795,871 (now U.S. Patent No. 6,427,120), which ...

AI Technical Summary

Problems solved by technology

As a result, it is challenging for GPS receivers to receive and lock onto GPS signals received from GPS satellites

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