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公开(公告)号：EP1281246A1
公开(公告)日：2003-02-05
申请号：EP01913163.0
申请日：2001-02-28
IPC分类号： H04B7/185
CPC分类号： H04B7/18523
摘要： A spot beam satellite communications system and method for delivering information to user terminals at a high data rate. In a hub, a high data rate serial data stream is separated into parallel data streams that are modulated onto respective uplink transponders. The uplink transponders are transmitted by the hub to an earth-orbiting satellite, which translates the uplink signals to downlink frequencies. The satellite broadcasts the transponders to user terminals located in the desired beam coverage areas on the earth. The user terminal separates the downlink transponders and demodulates each of the downlink transponder signals to regenerate the parallel data streams. The parallel data streams are combined to reproduce the original serial data stream. By dedicating multiple transponders to a particular data stream, data can be relayed at a very high data rate by a communications satellite that employs a standard transponder frequency assignment scheme.
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公开(公告)号：EP1247353A2
公开(公告)日：2002-10-09
申请号：EP00968379.8
申请日：2000-09-21
发明人： SHARON, Thomas, E. , TAYLOR, Thomas, S. , HAFNER, William, R. , RIGG, Steven, H. , HOWELL, James, M.
IPC分类号： H04B7/185
CPC分类号： H04B7/18584
摘要： A satellite communications system having ground user terminals, hubs, and a geosynchronous satellite. The satellite generates a network of spot beam coverage areas on the earth. A hub and at least one ground terminal are located in each of at least two spot beams. A first user terminal transmits an uplink signal according to a first signal protocol to the hub through the satellite. A second user terminal receives a downlink signal according to a second signal protocol through the downlink spot beam from the hub through the satellite. The hub may be located in the same spot beam coverage area as the first or the second user terminal or may be located in an altogether different spot beam coverage area. Through selective frequency and/or polarization routing on board the satellite, a hub located within a 'parent' beam can communicate with user terminals within the parent beam at a specified frequency and polarization, and can communicate with users in other 'dependent' beams on a different frequency and/or polarization. This routing allocates the total available bandwidth between parent and dependent beams. The system enables asynchronous communications between each hub and the satellite to maximize frequency re-use and the overall capacity of the system.
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公开(公告)号：EP1247353B1
公开(公告)日：2003-07-16
申请号：EP00968379.8
申请日：2000-09-21
发明人： SHARON, Thomas, E. , TAYLOR, Thomas, S. , HAFNER, William, R. , RIGG, Steven, H. , HOWELL, James, M. , GLYNN, Thomas W. , KERSHNER, Dennis L.
IPC分类号： H04B7/185
CPC分类号： H04B7/18584
摘要： A satellite communications system having ground user terminals, hubs, and a geosynchronous satellite. The satellite generates a network of spot beam coverage areas on the earth. A hub and at least one ground terminal are located in each of at least two spot beams. A first user terminal transmits an uplink signal according to a first signal protocol to the hub through the satellite. A second user terminal receives a downlink signal according to a second signal protocol through the downlink spot beam from the hub through the satellite. The hub may be located in the same spot beam coverage area as the first or the second user terminal or may be located in an altogether different spot beam coverage area. Through selective frequency and/or polarization routing on board the satellite, a hub located within a "parent" beam can communicate with user terminals within the parent beam at a specified frequency and polarization, and can communicate with users in other "dependent" beams on a different frequency and/or polarization. This routing allocates the total available bandwidth between parent and dependent beams. The system enables asynchronous communications between each hub and the satellite to maximize frequency re-use and the overall capacity of the system.
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