Method and apparatus for determining positions on the earth corresponding to an observed rate of change of satellite range
Patent 5488378 Issued on January 30, 1996. Estimated Expiration Date: 
December 28, 2013. 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.
December 28, 2013. 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 References 3430234 3906204 Method for determining the orientation of a moving platform Differential position determination using satellites Exploration system and method for high-accuracy and high-confidence level relative position and velocity determinations Patent #: 5202829 InventorAssigneeApplicationNo. 174085 filed on 12/28/1993US Classes:342/357.05Using Doppler frequency shiftExaminersPrimary: Issing, Gregory C.Attorney, Agent or FirmInternational ClassesG01S 005/02H04B 007/185 AbstractA method for using a value of range rate observed by a receiver, such as a GPS receiver, at a particular location, along with other satellite information, to determine the coordinates of points on the surface of the earth from which this value of range rate would be observed. These coordinates are given in an earth-centered, earth-fixed (ECEF) coordinate system, and they form a locus of points of equal range rate. The coordinates of these points provide estimates of the location of the GPS receiver.Other References
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