Method and apparatus for improving the accuracy of relative position estimates in a satellite-based navigation system
Patent 6049304 Issued on April 11, 2000. Estimated Expiration Date: 
July 10, 2017. 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.
July 10, 2017. 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 ReferencesAircraft location and identification system Post-processing of inverse differential corrections for SATPS mobile stations GPS relative position detection system Patent #: 5781150 InventorsAssigneeApplicationNo. 891227 filed on 07/10/1997US Classes:342/357.08, Determining relative position (e.g., distance or direction)701/213Using Global Positioning System (GPS)ExaminersPrimary: Issing, Gregory C.Attorney, Agent or FirmInternational ClassG01S 005/03AbstractThe accuracy of relative position estimates between two vehicles, generated using a satellite-based navigation system, is improved by eliminating at an early stage in the calculation process, errors affecting simultaneously both receivers. The standard absolute navigation equations are modified to solve directly for relative position, while avoiding a final step differentiation, thereby providing increased precision.Other References
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