Location system and method with acquisition of accurate location parameters
Patent 5515062 Issued on May 7, 1996. Estimated Expiration Date: 
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.
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 References 3742498 3769589 Range determining system Navigation system and method Differential Doppler receiver High dynamic global positioning system receiver Satellite-based position-determining system Method and system for locating an unknown transmitter Precise satellite ranging and timing system using pseudo-noise bandwidth synthesis Patent #: 5041833 InventorsAssigneeApplicationNo. 105227 filed on 08/11/1993US Classes:342/457, Land vehicle location (e.g., bus, police car342/352, Including a satellite342/418DopplerExaminersPrimary: Issing, Gregory C.Attorney, Agent or FirmInternational ClassesG01S 003/02G01S 003/52 H04B 007/185 AbstractA location system relies upon a non-coherent, FDM/TDM communication scheme to measure location parameters. A locator unit moves relative to the locatable unit. A series of messages are communicated between the locator unit and the locatable unit. Through feedback provided from the locator unit to the locatable unit, the locatable unit adjusts its reference frequency and time base so that signals it transmits arrive at the locator unit on a desired frequency and at a desired time slot. The locatable unit estimates Doppler and propagation duration and transmits the estimates to the locator unit. The locator unit measures offsets between desired frequencies and time slots and actual frequencies and time slots. The offsets are combined with the locatable unit's estimates of Doppler and propagation duration to form an integrated Doppler parameter and an integrated propagation duration parameter. The integrated Doppler and propagation duration are used to determine location.Other References
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