Teledesic LLC

Thomas L Hayden

Mark Alan Sturza

Janet L King

Richard C Deininger

Kenneth C Grzemski

A technique for sharing radio frequency spectrum between multiple satellite communication systems. A first and a second satellite communication system each contain a plurality of satellites in a plurality of non-geostationary (non-GSO) Earth orbits. Each of the plurality of non-GSOs has a predefined orbital plane. Within each orbital plane, satellites of the first and second satellite communication systems are alternating, such that each orbital plane contains satellites from each of the satellite systems. In this manner, it is possible to achieve satisfactory discrimination between satellites and Earth-based stations. The Earth-based station of each communication system will communicate with the closest satellite of its respective communication system. In an alternative technique that is particularly useful when an Earth-based station in the first communication system is able to communicate with more than one satellite, a satellite is selected based on the topocentric separation of the satellite from satellites in the second system. The system can also combine alternating satellites within an orbital plane with alternating orbital planes with satellites of each respective communication system.

Technique for sharing radio frequency spectrum in multiple satellite

A technique for sharing radio frequency spectrum in a multiple communication satellite system with a plurality of satellites in each of a plurality of non-geostationary (non-GSO) Earth orbits. A first satellite communication system uses a plurality of predefined non-GSO Earth orbits and a second satellite communication system uses a plurality of predefined orbits that are interleaved with the orbital planes of the first satellite communication system. In this manner, it is possible to achieve satisfactory discrimination between satellites and Earth-based stations. With near polar orbits, the topocentric separation between satellites decreases as the latitude of the Earth-based stations increases due to the convergence of orbital planes near the poles. To compensate for the decreased topocentric separation, the system utilizes one or more mitigation techniques to select one of a plurality of possible satellites to communicate with the Earth-based station in order to effectively increase topocentric separation.

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Issaquah, WA, United States of America

Thomas L Hayden