Non-uniform multi-beam satellite communications method
First Claim
Patent Images
1. A spacecraft broadcast method, comprising:
- broadcasting multiple communication signal beams from respective reflectors on a spacecraft to different respective target area locations in a non-uniform beam pattern, with at least some of said beams broadcast from different sized reflectors and having different beam roll-off characteristics, and providing different respective signal frequency spectrums for at least some of said beams.
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Accused Products
Abstract
A satellite broadcast system and method, particularly useful for television signals, allows for local as well as nationwide broadcast service by allocating greater satellite resources to the more important local service areas. This is accomplished by broadcasting a, non-uniform pattern of local service beams and designing the system to establish different service area priorities through factors such as the individual beam powers, sizes, roll-off characteristics and peak-to-edge power differentials. Frequency reuse is enhanced by permitting a certain degree of cross-beam interference, with lower levels of interference established for the more important service areas.
37 Citations
52 Claims
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1. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from respective reflectors on a spacecraft to different respective target area locations in a non-uniform beam pattern, with at least some of said beams broadcast from different sized reflectors and having different beam roll-off characteristics, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from respective reflectors on a spacecraft to different respective target area locations so that at least some of said beams have different sizes at their respective target locations, with at least some of said beams broadcast from different sized reflectors and having different beam roll-off characteristics, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from respective reflectors on a spacecraft to different respective target area locations with at least some of said beams having different beam powers at their respective target area locations, and at least some of said beams broadcast from different sized reflectors and having different beam roll-off characteristics, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from respective reflectors on a spacecraft to respective non-overlapping target area locations so that at least some of said beams have different sizes at their respective target area locations, with at least some of said beams broadcast from different sized reflectors and having different beam roll-off characteristics, and providing a common signal frequency spectrum for each of said beams. - View Dependent Claims (23, 24, 25, 26)
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27. A spacecraft broadcast method, comprising:
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broadcasting multiple communications signal beams from a spacecraft to different respective target area locations in a non-uniform beam pattern, with at least some of said beams broadcast with different design peak-to-edge power differentials, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from a spacecraft to different respective target area locations so that at least some of said beams have different sizes at their respective target locations, with at least some of said beams broadcast with different design peak-to-edge power differentials, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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42. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from a spacecraft to different respective target area locations with at least some of said beams having different beam powers at their respective target area locations, and at least some of said beams broadcast with different design peak-to-edge power differentials, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (43, 44, 45, 46, 47)
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48. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from a spacecraft to respective non-overlapping target area locations so that at least some of said beams have different sizes at their respective target area locations, with at least some of said beams broadcast with different design peak-to-edge power differentials, and providing a common signal frequency spectrum for each of said beams. - View Dependent Claims (49, 50, 51, 52)
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Specification