Method for limiting interference between satellite communications systems
First Claim
1. A method to reduce interference between a GSO satellite and its GSO ground station when operating an NGSO satellite or constellation of satellites orbiting at medium earth orbit (MEO), comprising the step of:
- terminating all transmission signals generated on a particular NGSO satellite or eminating from an NGSO ground station in communication with the NGSO satellite when the NGSO satellite is in an exclusion zone defined for a GSO ground station antenna.
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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.
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Citations
12 Claims
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1. A method to reduce interference between a GSO satellite and its GSO ground station when operating an NGSO satellite or constellation of satellites orbiting at medium earth orbit (MEO), comprising the step of:
terminating all transmission signals generated on a particular NGSO satellite or eminating from an NGSO ground station in communication with the NGSO satellite when the NGSO satellite is in an exclusion zone defined for a GSO ground station antenna. - View Dependent Claims (2, 3)
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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. - View Dependent Claims (5, 6, 7)
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8. A commmunication satellite particularly adapted for use in a MEO satellite constellation and system for full service, global comunication or communication (voice) and data signals, comprising:
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(a) a platform;
(b) at least two transceivers on the platform for receiving and transmitting of the signals, each transceiver including Integrated Digital Service (IDS) and Backhaul Data Service (BDS) for transmission, each transceiver also having a feeder link antenna and a tracking control system adapted for pointing and tracking the feeder link antenna at a selected gateway on the Earth, wherein seamless handoff between gateways occurs because each feeder link antenna has its own, dedicated tracking control system to allow each antenna to point at a different, selected gateway. - View Dependent Claims (9, 10)
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11. A method for mitigating intra-system interference in a satellite communication system having Integrated Digital Service (IDS) and Backhaul Data Service (3DS) operating at essentially a common frequency, comprising the steps of:
steering independent transmit antennas on separate satellites in a constellation, each antenna casting a footprint on the ground during transmission, so that a user in one footprint receives an IDS signal from a first satellite and a BDS signal from another satellite.
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12. In a satellite communication system having a plurality of satellites in a medium earth orbit (MEO) constellation transmitting a signal to a user in a broadcast footprint on the Earth, the method for minimizing interfeence with or emissions to co-frequency competing communication systems, comprising the step of:
transmitting only from the one satellite in the constellation that provides the highest elevation angle for the user while turning off other transmitters on other satellites otherwise capable of transmitting to the same footprint to conserve power consumption of the system.
Specification