Position ambiguity resolution
August 11, 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 ReferencesDirection finding localization system Method and apparatus for deriving pseudo range from earth-orbiting satellites Satellite communication system and method with message authentication suitable for use in financial institutions Method of and apparatus for obtaining vehicle heading information Position aided subscriber unit for a satellite cellular system Pseudolite-aided method for precision kinematic positioning Patent #: 5177489 InventorAssigneeApplicationNo. 105235 filed on 08/11/1993US Classes:342/357.04, With ambiguity resolving701/207Employing position determining equipmentExaminersPrimary: Issing, Gregory C.Attorney, Agent or FirmInternational ClassesG01S 005/02G01C 021/00 AbstractA radio telecommunications system includes a number of locator satellites in low earth orbits. Locatable subscriber units communicate with the satellites. A single subscriber unit communicates with a single satellite using electromagnetic signals so that a measurement processor can obtain Doppler component, propagation duration, and real time measurements of the signals. A location processor converts these measurements into a two-position location solution. The two-position solution includes an actual position and an image position. The actual position may be detected in some situations by identifying a cell within which communications take place. In other situations, the actual position may be distinguished from the image position by detecting the eastward rotation of the earth. A service processor determines which qualifications to apply to communication services offered by the system. These qualifications are based on the subscriber unit's location.Other References
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