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 Title: |
US5822680:
Frequency sharing for satellite communication system
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Stuart, James R.; Louisville, CO
Sturza, Mark Alan; Woodland Hills, CA
Patterson, David P.; Bellevue, WA
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| Assignee: |
Teledesic LLC, Kirkland, WA
other patents from TELEDESIC LLC (746777) (approx. 21)
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| Published / Filed: |
1998-10-13
/ 1996-11-07
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| Application Number: |
US1996000744337
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| IPC Code: |
Advanced:
H04B 7/185;
Core:
more...
IPC-7:
H04B 7/185;
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| ECLA Code: |
H04B7/185D2;
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| U.S. Class: |
Current:
455/012.1;
455/427;
455/447;
Original:
455/012.1;
455/447;
455/427;
455/063;
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| Field of Search: |
455/3.2,12.1,13.1,13.2,13.3,63,278.1,296,427,429,430,431,447,562
342/075,352,356,359
370/316,317
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| Priority Number: |
| 1996-11-07 |
US1996000744337 |
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| Abstract: |
A communication system and methods for sharing a common communication frequency, without interfering with a second communication system which has a plurality of satellites operating in geostationary orbits (GO) and ground stations (GS) which communicate with the satellites (GEO) on the common communication frequency, is disclosed. Conventional geostationary satellites broadcast in C and Ku bands. Ground stations (GS) which receive these signals must have their antennas pointed toward the plane of the Equator (EQ). Satellites (10) which occupy inclined orbits (LO) and communicate with terrestrial terminals (12) propagate beams of energy that do not intersect the plane of the Earth's Equator. Terrestrial terminals (12) in the northern hemisphere communicate with a satellite (10) only when the sub-satellite point of the satellite (10) is at a latitude more northerly than the terrestrial terminal (12). Terrestrial terminals (12) in the southern hemisphere communicate with a satellite (10) only when the sub-satellite point of the satellite (10) is at a latitude more southerly than the terrestrial terminal (12). The spatial isolation of signals achieved by this novel pointing method insures that both the geostationary and inclined orbit satellite systems do not interfere with each other.
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| Attorney, Agent or Firm: |
Christensen, O'Connor, Johnson & Kindness PLLC ;
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| Primary / Asst. Examiners: |
Vo, Nguyen; Aoki, Makoto
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| INPADOC Legal Status: |
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| Designated Country: |
DE FR GB IT EP
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| Family: |
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First Claim:
Show all 20 claims |
What is claimed is:
1. A communication system for sharing, without interfering with a second communication system, a common communication frequency, said second communication system having a plurality of satellites (GEO) operating in Equatorial orbital planes (GO) and ground stations (GS) which communicate with said plurality of satellites (GEO) in said Equatorial orbit planes (GO) on said common communication frequency; said communication system comprising:
- a satellite (10) operating in an inclined orbit;
- a terrestrial terminal (12); said terrestrial terminal (12) having an antenna which transmits and receives a beam of radiant energy (14) for communicating with said satellite (10); said beam of radiant energy (14) having a frequency common with said second communication system; and
- said terrestrial terminal (12) communicating with said satellite (10) only when said beam of radiant energy (14) does not intersect said Equatorial orbital planes (GO).
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 20 U.S. patent(s) that reference this one
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