Communication satellite facility and satellite communication system providing bidirectional wideband intersatellite communication
First Claim
1. A communication satellite facility comprising a first satellite at least having a receiving antenna adapted to receive radio-frequency signals transmitted from a ground station, down converter means adapted to convert the radio-frequency signals received by said receiving antenna to intermediate frequency signals, a transmitting antenna adapted to transmit radio-frequency signals to the ground station, up converter means adapted to the intermediate frequency signals to be transmitted again to the radio-frequency signals, switching means adapted for switching/routing the transmitted/received radio-frequency signals and wideband intersatellite communication means adapted for bidirectional wideband intersatellite communication between said first satellite and a second satellite;
- andsaid second satellite at least having wideband intersatellite communication means adapted for bidirectional wideband intersatellite communication between said second satellite and said first satellite, modulating/demodulating means adapted to modulate/demodulate the signals transmitted and received by said wideband intersatellite communication means, and a circuit switching unit for a data link layer and a network layer to conduct baseband signal processing.
2 Assignments
0 Petitions
Accused Products
Abstract
A communication satellite facility and a satellite communication system adapted to respond flexibly to development and change of communication technologies occurring on the ground even after satellites have been launched. The system includes a first satellite having an antenna function, a second satellite having a modem function and a third satellite having a server function all of which are launched into one and same slot of geosynchronous orbit and connected one to another by wideband intersatellite communication. A ground station connected to a ground network communicates with the first satellite.
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Citations
14 Claims
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1. A communication satellite facility comprising a first satellite at least having a receiving antenna adapted to receive radio-frequency signals transmitted from a ground station, down converter means adapted to convert the radio-frequency signals received by said receiving antenna to intermediate frequency signals, a transmitting antenna adapted to transmit radio-frequency signals to the ground station, up converter means adapted to the intermediate frequency signals to be transmitted again to the radio-frequency signals, switching means adapted for switching/routing the transmitted/received radio-frequency signals and wideband intersatellite communication means adapted for bidirectional wideband intersatellite communication between said first satellite and a second satellite;
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said second satellite at least having wideband intersatellite communication means adapted for bidirectional wideband intersatellite communication between said second satellite and said first satellite, modulating/demodulating means adapted to modulate/demodulate the signals transmitted and received by said wideband intersatellite communication means, and a circuit switching unit for a data link layer and a network layer to conduct baseband signal processing. - View Dependent Claims (2, 3, 4)
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5. A satellite communication system comprising a first satellite at least having a receiving antenna adapted to receive radio-frequency signals transmitted from a ground station, down converter means adapted to convert the radio-frequency signals received by said receiving antenna to intermediate frequency signals, a transmitting antenna adapted to transmit radio-frequency signals to the ground station, up converter means adapted to the intermediate frequency signals to be transmitted again to the radio-frequency signals, switching means adapted for switching/routing the transmitted/received said radio-frequency signals and wideband intersatellite communication means adapted for bidirectional wideband intersatellite communication between said first satellite and a second satellite;
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said second satellite at least having wideband intersatellite communication means adapted for bidirectional wideband intersatellite communication between said second satellite and said first satellite, modulating/demodulating means adapted to modulate/demodulate the signals transmitted and received by said wideband intersatellite communication means, and a circuit switching unit for a data link layer and a network layer to conduct baseband signal processing; and said ground station at least having an antenna adapted for transmitting/receiving radio-frequency signals between said ground station and said first satellite, ground station signal processor means adapted to process the transmitted/received signals at least inclusive of modulation/demodulation in accordance with a given communication method and interface means to a ground network. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification