METHOD FOR ESTIMATING GPS REFERENCE FREQUENCY DRIFT FROM VCO-BURST OF PDC HANDSET

Title:

METHOD FOR ESTIMATING GPS REFERENCE FREQUENCY DRIFT FROM VCO-BURST OF PDC HANDSET

Document Type and Number:

Japanese Patent JP2005070054

Kind Code:

A

Abstract:

To provide a method for estimating Global Positioning System (GPS) reference frequency drift from Voltage-Controlled Oscillator (VCO) burst of a Personal Digital Cellular (PDC) handset.

A combination product of mobile phone and NAV satellite receiver is provided with a circuit for compensating the reference frequency drift of a GPS receiver, by using VCO burst information periodically received at the PDC handset. By having the reference frequency drift of the GPS receiver compensated, stable operation of both high-speed initialization and positional solution are made available to users. A GPS numerical controlled type oscillator (NCO) receives the VCO sample of the PDC handset.

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Inventors:

MCBURNEY PAUL W

Application Number:

JP2004247881A

Publication Date:

March 17, 2005

Filing Date:

August 27, 2004

Export Citation:

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Assignee:

SEIKO EPSON CORP
ERIDE INC

International Classes:

G01C21/06; G01S1/00; G01S5/00; G01S19/25; H04B7/26; (IPC1-7): G01S5/14; G01C21/06; H04B7/26

Attorney, Agent or Firm:

Masahiko Ueyanagi
Fujitsuna Hideyoshi
Osamu Suzawa

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