Vehicle location system accuracy enhancement for airborne vehicles
May 8, 2009. 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 3836970 3916410 Satellite radio ranging velocity navigation Method of and system for locating a position Secure position identity and time reporting system Tactical nagivation and communication system System for locating mobile objects in distress Satellite-based vehicle position determining system Remote controlled tracking transmitter and tracking support system Position-fixing system InventorApplicationNo. 349985 filed on 05/08/1989US Classes:342/357.01, With position indicating342/454, Traffic342/463, Having plural transmitters or receivers701/215, Having multiple GPS antennas or receivers (e.g., differential GPS)701/300RELATIVE LOCATIONExaminersPrimary: Sotomayor, John B.Attorney, Agent or FirmForeign Patent References
International ClassesG01S 005/14H04B 007/185 AbstractA vehicle location system incorporating a plurality of ground enhancement stations and at least one satellite to receive encoded transmissions from a radio transmitter aboard a user vehicle. The satellite transmits the signals received directly from the user and those relayed by the ground enhancement station to a base station where a computer calculates the position of the user on the basis of the time difference between the time of arrival of the signals. The use of the ground enhancement stations, located throughout the area in which the user is to be located provides lower geometric dilution of precision than purely satellite or purely ground base systems, and in combination with the relatively simple transmitter aboard the vehicle and transponders at the ground enhancement stations and satellite, substantially reduces the cost of deployment of such a system. Means may be provided to give the results of the calculation of position to the user by a radio link from the satellite or a ground enhancement station.Other References
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