Non-uniform multi-beam satellite communications system and method
First Claim
Patent Images
1. A spacecraft broadcast method, comprising:
- broadcasting multiple communication signal beams from a spacecraft to different respective target area locations in a non-uniform beam pattern so that at least some of said beams have different sizes at their respective target locations, with at least some smaller beams having higher power levels than at least some larger beams, and providing different respective signal frequency spectrums for at least some of said beams.
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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.
19 Citations
30 Claims
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1. A spacecraft broadcast method, comprising:
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broadcasting multiple communication signal beams from a spacecraft to different respective target area locations in a non-uniform beam pattern so that at least some of said beams have different sizes at their respective target locations, with at least some smaller beams having higher power levels than at least some larger beams, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 smaller beams having higher power levels than at least some larger beams, and providing different respective signal frequency spectrums for at least some of said beams. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. 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 and at least some smaller beams have higher power levels than at least some larger beams, and providing a common signal frequency spectrum for each of said beams. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification