SYSTEM FOR PROVIDING LOCATION-SPECIFIC DATA TO A USER
First Claim
1. A system for providing location-specific data to a user, comprising:
- a broadcast station for transmitting general data potentially usable by a plurality of users located at different geographic positions;
a relay satellite for relaying said general data from said broadcast station to said plurality of users; and
a receiver terminal provided for each of said users, said receiver terminal comprising a broadcast receiver for receiving said general data from said relay satellite, a position determination unit for determining the geographic position of the user, and a processor for converting said general data to location-specific data based on the geographic position of said user as determined by said position determination unit.
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Accused Products
Abstract
An FDMA/TDM satellite-based digital broadcast system is used to provide digital maps and other types of data to users at remote locations. User selection of the desired data is achieved by monitoring the TDM downlink channels of the broadcast system in accordance with a predetermined schedule or until a specific identification code is detected. The user terminals are equipped with Global Positioning System (GPS) receivers which allow the positions of the users to be determined. Based on the user positions, the user terminals are able to convert general data to location-specific data tailored to the needs of the user. The general data may comprise a digital map covering a wide geographic area, and the location-specific data may comprise a map covering a portion of the geographic region where the user is located.
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Citations
20 Claims
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1. A system for providing location-specific data to a user, comprising:
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a broadcast station for transmitting general data potentially usable by a plurality of users located at different geographic positions;
a relay satellite for relaying said general data from said broadcast station to said plurality of users; and
a receiver terminal provided for each of said users, said receiver terminal comprising a broadcast receiver for receiving said general data from said relay satellite, a position determination unit for determining the geographic position of the user, and a processor for converting said general data to location-specific data based on the geographic position of said user as determined by said position determination unit. - View Dependent Claims (2, 3, 4, 5, 7)
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8. A receiver terminal for providing location-specific data to a user, comprising:
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a broadcast receiver for receiving general data transmitted by a broadcast station;
a position determination unit for determining the geographic position of the receiver terminal; and
a processor for converting said general image data to location-specific image data based on the geographic position of the receiver terminal. - View Dependent Claims (6, 9, 10, 11, 12, 13, 14)
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15. A method for providing location-specific data to a user, comprising:
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transmitting general data potentially usable by a plurality of users located at different geographic positions;
receiving said general data at one of said user locations;
determining the geographic position of said user; and
converting said general data to location-specific data based on the geographic position of said user. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification