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 Title: |
US5227802:
Satellite system cell management
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Pullman, Michele A.; Phoenix, AZ
Peterson, Kenneth M.; Phoenix, AZ
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| Assignee: |
Motorola, Inc., Schaumburg, IL
other patents from MOTOROLA, INC. (386735) (approx. 18,357)
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| Published / Filed: |
1993-07-13
/ 1991-12-23
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| Application Number: |
US1991000812389
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| IPC Code: |
Advanced:
B64G 1/24;
B64G 1/66;
H04B 7/185;
H04B 7/195;
H04B 7/204;
Core:
more...
IPC-7:
H04B 7/185;
H04B 7/19;
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| U.S. Class: |
Current:
342/352;
342/354;
Original:
342/352;
342/354;
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| Field of Search: |
342/350,352,353,354,360
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| Priority Number: |
| 1991-12-23 |
US1991000812389 |
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| Abstract: |
There is provided a method and means for controlling the amount of overlap and gaps in coverage of antenna pattern cells of a moving satellite communication system, by determining the relative spatial location of overlapping or gaping cells of converging or diverging satellites as a function of time; determining a point where antenna coverage of one or more cells from a first moving satellite will overlap or gap one or more cells from a second satellite; and turning off or on one or more of the overlapping or gaping cells so as to eliminate interference therebetween without leaving substantial coverage gaps between adjacent antenna patterns.
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| Attorney, Agent or Firm: |
Handy, Robert M. ;
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| Primary / Asst. Examiners: |
Issing, Gregory C.;
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| Maintenance Status: |
CC Certificate of Correction issued
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
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| Family: |
Show 7 known family members
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First Claim:
Show all 25 claims |
What is claimed is:
1. A method of operation of a satellite communication system, comprising:
- enabling first and second communication satellites having, respectively, first and second multicelled antenna patterns which move over the surface of the earth relative to each other and overlap by varying amounts as the orbital paths of the satellites converge and diverge, wherein the first and second satellites are active a majority of their orbits and simultaneously service substantially different, but adjacent geographical areas;
- determining, respectively, the relative locations of first and second multicelled antenna coverage patterns of antennas of the first and second satellites;
- determining positions in the orbits of the first and second satellites when the first and second multicelled antenna coverage patterns overlap by varying amounts as the satellites move with respect to each other; and
- modifying the antenna coverage pattern of one or both satellites as a function of orbital position to avoid substantially interfering overlap or significant no-coverage gap.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 34 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other References: |
An article entitled "Analytic Design of Satellite Constellations for Zonal Earth Coverage using Inclined Circular Orbits" by L. Rider, The Journal of the Astronautical Sciences, vol. 34, No. 1, Jan.-Mar. 1986, pp. 31-34.
(34 pages)
Cited by 4 patents
An article entitled "Circular Polar Constellations Providing Continuous Single or Multiple Coverage Above a Specified Latitude" by W. S. Adams and L. Rider, The Journal of the Astronautical Sciences, vol. 35, No. 2, Apr.-Jun. 1987, pp. 155-192.
(38 pages)
Cited by 9 patents
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