GPS and satellite navigation system
Patent 5467282 Issued on November 14, 1995. Estimated Expiration Date: 
August 19, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 19, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSatellite navigational system and method Differential navigation system for remote mobile users Method for precision dynamic differential positioning Ridge regression signal processing for position-fix navigation systems Satellite-based vehicle communication/position determination system GPS and satelite navigation system Patent #: 5365447 InventorApplicationNo. 293735 filed on 08/19/1994US Classes:701/215, Having multiple GPS antennas or receivers (e.g., differential GPS)342/352, Including a satellite342/356, Synchronous satellite342/357.02With accuracy enhancingExaminersPrimary: Teska, Kevin J.Assistant: Walker, Tyrone V. Attorney, Agent or FirmForeign Patent References
International ClassH04B 007/185AbstractA satellite-based navigation system providing improved accuracy and reliability over wide geographical areas, including remote regions, is disclosed. Ranging-type signals transmitted through two or more commercial geostationary telecommunication satellites are received at known reference locations where navigation and correction information is generated and transmitted back to remote users. At the same time, the reference stations receive signals from the Global Positioning System (GPS), generate corrections for the GPS measurements, then transmit these corrections to the remote user. The remote user receives all of this information plus direct measurements from both the GPS and the geostationary satellites and, using conditional error processing techniques, provides a position solution whose accuracy and reliability exceeds that of GPS alone. Alternatively, integrated carrier phase data can be substituted for pseudoranges obtained from the geostationary satellite transmissions.Other References
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