Satellite communication system, LEO satellite relaying communications between a GEO satellite and terrestrial stations, the uplinks and downlinks using the same frequency band and time-division multiplexing
First Claim
1. A payload for a repeater satellite in a telecommunication system, said repeater satellite being on a traveling orbit above the surface of Earth, and the payload being configured to repeat data received from a stationary satellite above the surface of Earth to terminals that are substantially on the surface of Earth, and to repeat data received from the terminals to the stationary satellite, wherein said payload comprises:
- a first circuitry configured to use a same frequency band for repeating data to the stationary satellite, referred to as uplink transmissions, and for repeating data to the terminals, referred to as downlink transmissions, said frequency band being any one of the bands VHF, UHF, L, S, C, X, Ka or Q; and
a second circuitry configured to time multiplex the uplink transmissions and the downlink transmissions, such that said payload does not perform uplink transmissions to the stationary satellite during intervals of time in which said payload performs downlink transmissions to the terminals, and such that said payload does not perform downlink transmissions to the terminals during intervals of time in which said payload performs uplink transmissions to the stationary satellite.
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Accused Products
Abstract
A payload for a repeater satellite of a communication system. The repeater satellite being placed into drift orbit above the surface of a celestial body. The payload being configured to repeat data received from a stationary satellite above the surface of the celestial body towards a terminal substantially at the surface of the celestial body, and to repeat data received from the terminal towards the stationary satellite. The payload is further configured to use a single frequency band for repeating data towards the stationary satellite, referred to as uplink transmission, and for repeating data towards the terminal, referred to as downlink transmission, as well as to time-division multiplex the uplink transmissions and the downlink transmissions. Also, a telecommunication system includes a repeater satellite provided with aforesaid payload, and a satellite communication method for transferring data between the terminal and the stationary satellite.
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Citations
16 Claims
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1. A payload for a repeater satellite in a telecommunication system, said repeater satellite being on a traveling orbit above the surface of Earth, and the payload being configured to repeat data received from a stationary satellite above the surface of Earth to terminals that are substantially on the surface of Earth, and to repeat data received from the terminals to the stationary satellite, wherein said payload comprises:
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a first circuitry configured to use a same frequency band for repeating data to the stationary satellite, referred to as uplink transmissions, and for repeating data to the terminals, referred to as downlink transmissions, said frequency band being any one of the bands VHF, UHF, L, S, C, X, Ka or Q; and a second circuitry configured to time multiplex the uplink transmissions and the downlink transmissions, such that said payload does not perform uplink transmissions to the stationary satellite during intervals of time in which said payload performs downlink transmissions to the terminals, and such that said payload does not perform downlink transmissions to the terminals during intervals of time in which said payload performs uplink transmissions to the stationary satellite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A telecommunication method for transferring data between terminals, situated substantially on the surface of a celestial body, and a stationary satellite above the surface of the celestial body, the data transfer between said terminals and said stationary satellite being performed by a repeater satellite configured to repeat data received from said stationary satellite to said terminals and to repeat data received from said terminals to said stationary satellite, comprising the steps, by the repeater satellite, of:
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repeating data to the stationary satellite, referred to as uplink transmissions and repeating data to the terminals, referred to as downlink transmissions and utilizing a same frequency band for the uplink transmissions and for the downlink transmissions, said frequency band being any one of the bands VHF, UHF, L, S, C, X, Ka or Q; and time multiplexing the uplink transmissions and the downlink transmissions such that said payload does not perform uplink transmissions to the stationary satellite during intervals of time in which said payload performs downlink transmissions to the terminals, and such that said payload does not perform downlink transmissions to the terminals during intervals of time in which said payload performs uplink transmissions to the stationary satellite. - View Dependent Claims (13, 14, 15, 16)
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Specification