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公开(公告)号：DE69513836T2
公开(公告)日：2000-05-31
申请号：DE69513836
申请日：1995-05-16
Applicant: INMARSAT LTD
Inventor： HART NICHOLAS , BJOERNSTROM GUNNAR
Abstract: An earth station (8) receives a return signal (3) via more than one satellite link (4a,4b) from a mobile terminal (2) using TDMA. The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3;15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a;4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a;4b) relative to a fixed region falls below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointing at the radir.
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公开(公告)号：AU2450795A
公开(公告)日：1996-06-17
申请号：AU2450795
申请日：1995-05-12
Applicant: INMARSAT LTD
Inventor： BAERE JAN DE , HART NICHOLAS
Abstract: A method of interconnecting a satellite mobile communications system user terminal (2) and another telecommunications user terminal (2, 12), comprising determining a plurality of possible earth stations (6) via which said satellite system user terminal (2) could communicate via a satellite (4); selecting one of said plurality; and interconnecting the two user terminals via said selected earth station (6).
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公开(公告)号：IN192234B
公开(公告)日：2004-03-20
申请号：IN894MA1995
申请日：1995-07-14
Applicant: INMARSAT LTD
Inventor： HART NICHOLAS , BJORNSTROM GUNNAR
Abstract: An earth station (8) receives a return signal (3) via more than one satellite link (4a,4b) from a mobile terminal (2) using TDMA. The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3;15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a;4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a;4b) relative to a fixed region falls below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointing at the radir.
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公开(公告)号：DE69526518T2
公开(公告)日：2002-10-17
申请号：DE69526518
申请日：1995-05-12
Applicant: INMARSAT LTD
Inventor： DE BAERE JAN , HART NICHOLAS
Abstract: A method of interconnecting a satellite mobile communications system user terminal (2) and another telecommunications user terminal (2, 12), comprising determining a plurality of possible earth stations (6) via which said satellite system user terminal (2) could communicate via a satellite (4); selecting one of said plurality; and interconnecting the two user terminals via said selected earth station (6).
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Patent Agency Ranking
公开(公告)号：CA2432347A1
公开(公告)日：1996-02-08
申请号：CA2432347
申请日：1995-05-16
Applicant: INMARSAT LTD
Inventor： BJORNSTROM GUNNAR , HART NICHOLAS
Abstract: An earth station (8) receives a return signal (3) via more than one satellit e link (4a, 4b) from a mobile terminal (2) using TDMA. The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3; 15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a; 4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a; 4b) relative to a fixed region falls below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointing at the nadir.
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公开(公告)号：CA2432345A1
公开(公告)日：1996-02-08
申请号：CA2432345
申请日：1995-05-16
Applicant: INMARSAT LTD
Inventor： BJORNSTROM GUNNAR , HART NICHOLAS
Abstract: An earth station (8) receives a return signal (3) via more than one satellit e link (4a, 4b) from a mobile terminal (2) using TDMA. The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3; 15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a; 4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a; 4b) relative to a fixed region fails below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointed at the nadir.
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公开(公告)号：CA2432347C
公开(公告)日：2005-08-02
申请号：CA2432347
申请日：1995-05-16
Applicant: INMARSAT LTD
Inventor： HART NICHOLAS , BJORNSTROM GUNNAR
Abstract: An earth station (8) receives a return signal (3) via more than one satellit e link (4a, 4b) from a mobile terminal (2) using TDMA. The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3; 15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a; 4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a; 4b) relative to a fixed region falls below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointing at the nadir.
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公开(公告)号：DE69513836D1
公开(公告)日：2000-01-13
申请号：DE69513836
申请日：1995-05-16
Applicant: INMARSAT LTD
Inventor： HART NICHOLAS , BJOERNSTROM GUNNAR
Abstract: An earth station (8) receives a return signal (3) via more than one satellite link (4a,4b) from a mobile terminal (2) using TDMA. The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3;15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a;4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a;4b) relative to a fixed region falls below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointing at the radir.
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公开(公告)号：DE69526518D1
公开(公告)日：2002-05-29
申请号：DE69526518
申请日：1995-05-12
Applicant: INMARSAT LTD
Inventor： DE BAERE JAN , HART NICHOLAS
Abstract: A method of interconnecting a satellite mobile communications system user terminal (2) and another telecommunications user terminal (2, 12), comprising determining a plurality of possible earth stations (6) via which said satellite system user terminal (2) could communicate via a satellite (4); selecting one of said plurality; and interconnecting the two user terminals via said selected earth station (6).
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