Satellite communications system
First Claim
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1. A satellite constellation communication system, comprising:
- a plurality of satellites forming a constellation orbiting the Earth in a generally circular orbit in four sets, each set defining an orbital plane, each plane inclined about 57°
relative to the equator, the satellites being at an altitude of medium earth orbit (MEO) of about 20,000 km, the system providing truly global coverage while substantially minimizing the number of operational satellites required.
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Abstract
Boeing achieves satellite diversity by having a large discrimination angle for a MEO constellation of communications satellites to limit interference in the Ku-band with GSO communications systems. Each satellite entering an exclusion zone over a GSO ground station terminates all transmissions to provide EPFD within acceptable limits. The Boeing MEO constellation preferably comprises 20 satellites, 5 in each orbit. The four orbits are inclined at about 57° with respect to the equator. Services include an Integrated Digital Service (IDS) and Backhaul Data Service (BDS) to accommodate the needs of different users.
65 Citations
11 Claims
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1. A satellite constellation communication system, comprising:
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a plurality of satellites forming a constellation orbiting the Earth in a generally circular orbit in four sets, each set defining an orbital plane, each plane inclined about 57°
relative to the equator, the satellites being at an altitude of medium earth orbit (MEO) of about 20,000 km,the system providing truly global coverage while substantially minimizing the number of operational satellites required. - View Dependent Claims (2, 3)
wherein the backhaul data services include steerable transmit and receive beams.
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4. A satellite constellation communication system, comprising:
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a plurality of satellites forming a constellation orbiting the Earth in four sets, each set defining an orbital plane, each plane inclined about 57°
relative to the equator, the satellites being at an altitude of medium earth orbit (MEO) of about 20,000 km,the system providing truly global coverage while substantially minimizing the number of operational satellites required, wherein each satellite includes integrated digital services and backhaul data services, wherein the integrated digital services generates a pattern of spot beams, uses a three-cell frequency reuse pattern, and uses dual polarization within each spot beam. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification