Burst signal transmission from an earth station to an orbiting satellite with a short guard time
First Claim
1. A burst signal transmitting method of transmitting a burst signal from an earth station of a satellite communication network including a predetermined number of orbiting satellites, comprising the steps of;
- beam transmitting from each of said satellites M spot beams with M identification codes superposed on said spot beams, respectively, where M represents an integer which is equal to at least two, said identification codes being individually specific to said spot beams and for identification and recognition of said spot beams;
beam receiving in said earth station one of said spot beams as a received beam at a reception time instant from one of said satellites;
beam recognizing said one of said spot beams by one of said identification codes that is superposed on said received beam; and
a signal transmitting said burst signal to said one of said satellites at a transmission time instant following said reception time instant by an offset amount selected from M offset amounts predetermined for said identification codes, respectively, said offset amount being selected by said earth station in response to said one of said identification codes.
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Abstract
Radiated from each orbiting satellite of a satellite communication network to M cells (M representing an integer, such as thirty-seven) covered with a predetermined solid angle on the earth, M spot beams are identified by M identification codes. In an earth station which may be a portable unit, a burst signal transmitter device (31) comprises a receiver part (35) receiving one of the spot beams as a received beam at a reception time, to recognize as a recognized code one of the identification codes that identifies the received beam, and a transmitter part (45) for transmitting burst signals at a transmission time delayed from the reception time by an offset amount selected by the recognized code from M offset amounts predetermined for the identification codes. Preferably, the M offset amounts are stored in a memory (43).
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Citations
31 Claims
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1. A burst signal transmitting method of transmitting a burst signal from an earth station of a satellite communication network including a predetermined number of orbiting satellites, comprising the steps of;
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beam transmitting from each of said satellites M spot beams with M identification codes superposed on said spot beams, respectively, where M represents an integer which is equal to at least two, said identification codes being individually specific to said spot beams and for identification and recognition of said spot beams; beam receiving in said earth station one of said spot beams as a received beam at a reception time instant from one of said satellites; beam recognizing said one of said spot beams by one of said identification codes that is superposed on said received beam; and a signal transmitting said burst signal to said one of said satellites at a transmission time instant following said reception time instant by an offset amount selected from M offset amounts predetermined for said identification codes, respectively, said offset amount being selected by said earth station in response to said one of said identification codes. - View Dependent Claims (2, 3, 4, 5)
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6. A burst signal transmitter device of an earth station of a satellite communication network including a predetermined number of orbiting satellites, each satellite radiating M spot beams identified by M identification codes, respectively, where M represents an integer which is equal at least to two, said identification codes being individually specific to said spot beams and for identification and recognition of said spot beams, said burst signal transmitter device transmitting a burst signal to one of said satellites that irradiates said earth station by one of said spot beams, said burst signal transmitter device comprising:
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receiver means for receiving said one of said spot beams from said one of said satellites as a received signal at a reception time instant; recognizing means for recognizing said one of said spot beams by one of said identification codes that identifies said received signal; and transmitter means for transmitting said burst signal to said one of said satellites at a transmission time instant following said reception time instant by an offset amount selected from M offset amounts predetermined for said identification codes, respectively, said offset amount being selected by said earth station in response to said one of said identification codes. - View Dependent Claims (7, 8, 9, 10)
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- 11. A transponder mounted on an orbiting satellite of a satellite communication network including a plurality of earth stations, wherein said transponder comprises transmitter means for transmitting M spot beams to said earth stations with M identification codes superposed on said spot beams, respectively, where M represents an integer which is equal at least to two, said identification codes being individually specific to said spot beams and for identification and recognition of said spot beams, each said earth station transmitting a burst signal to said transponder with a guard time based on which of said spot beams was transmitted to said earth station, to achieve alignment of said burst signal in time slots on said transponder with burst signals transmitted to said transponder from others of said earth stations.
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19. A burst signal transmitter device of an earth station of a satellite communication network including a predetermined number of orbiting satellites, each satellite radiating M spot beams identified by M identification codes, respectively, where M represents an integer which is equal at least to two, said identification codes being individually specific to said spot beams and for identification and recognition of said spot beams, said burst signal transmitter device transmitting a burst signal to one of said satellites that irradiates said earth station by one of said spot beams, said burst signal transmitter device comprising:
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a receiver for receiving said one of said spot beams from said one of said satellites as a received signal at a reception time instant; a transmitter for transmitting said burst signal to said one of said satellites at a transmission time instant following said reception time instant by an offset amount selected from M offset amounts predetermined for said identification codes, respectively, said offset amount being selected by said earth station in response to said one of said identification codes; wherein said burst signal transmitter device recognizes said one of said spot beams by one of said identification codes that identifies said received signal. - View Dependent Claims (20, 21, 22, 23)
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- 24. A transponder mounted on an orbiting satellite of a satellite communication network including a plurality of earth stations, wherein said transponder comprises a transmitter for transmitting M spot beams to said earth stations with M identification codes superposed on said spot beams, respectively, where M represents an integer which is equal at least to two, said identification codes being individually specific to said spot beams and for identification and recognition of said spot beams, each said earth station transmitting a burst signal to said transponder with a guard time based on which of said spot beams was transmitted to said earth station, to achieve alignment of said burst signal in time slots on said transponder with burst signals transmitted to said transponder from others of said earth stations.
Specification