Position aided subscriber unit for a satellite cellular system
First Claim
1. In a satellite communication system, a subscriber unit for receiving and for transmitting digital data and for self-determining the location of said subscriber unit, said subscriber unit comprising:
- means for receiving from and transmitting to a satellite of said satellite communication system digital user data;
said means for receiving and transmitting including transmitter/receiver means coupled to a plurality of satellites of said satellite communication system and coupled to a plurality of satellites of a global positioning system to receive location information from said global positioning system to receive and to transmit digital data to and from said satellites of said satellite communication system; and
means for self-determining said location of said subscriber unit from said location information of said global positioning system and for transmitting said location of said subscriber unit to said satellite communication system, said means for self-determining being coupled to said transmitter/received means.
3 Assignments
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Accused Products
Abstract
A subscriber unit for communicating with a satellite communication system. This subscriber unit receives and transmits digital data from satellites of a satellite communication system. In addition, the subscriber unit self-determines its own position and transmits this position to the satellites of the satellite communication system. In this way, the satellite communication sytem knows the position of each subscriber unit so that communications may be established more efficiently. In addition, the position of the subscriber unit is automatically determined from the received GPS signals and reported to the satellite communication system for other uses such as asset management and search and rescue operations.
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Citations
10 Claims
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1. In a satellite communication system, a subscriber unit for receiving and for transmitting digital data and for self-determining the location of said subscriber unit, said subscriber unit comprising:
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means for receiving from and transmitting to a satellite of said satellite communication system digital user data; said means for receiving and transmitting including transmitter/receiver means coupled to a plurality of satellites of said satellite communication system and coupled to a plurality of satellites of a global positioning system to receive location information from said global positioning system to receive and to transmit digital data to and from said satellites of said satellite communication system; and means for self-determining said location of said subscriber unit from said location information of said global positioning system and for transmitting said location of said subscriber unit to said satellite communication system, said means for self-determining being coupled to said transmitter/received means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a satellite communication system, a subscriber unit for receiving and for transmitting digital data and for self-determining the location of said subscriber unit, said subscriber unit comprising:
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means for receiving from and transmitting to a satellite of said satellite communication system digital user data; said means for receiving and transmitting further operating to receive digital data from a plurality of satellites of a global positioning system; means for recovering the user data transmitted by said satellite of said satellite communication system; global positioning system receiver means for self-determining said location of said subscriber unit from said digital data of said satellites of said global positioning system and for transmitting said location of said subscriber unit to said satellite of said satellite communication system; and means for transmitting digital user data from said subscriber unit to said satellite of said satellite communication system.
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Specification