Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1989-05-08
1992-03-24
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342463, 342454, G01S 514, H04B 7185
Patent
active
050992457
ABSTRACT:
A 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.
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PCT/US88/03474 International Search Report.
Denson-Low Wanda K.
Hughes Aircraft Company
Sotomayor John B.
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