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 Title: |
US5621415:
Linear cell satellite system
[ Derwent Title ]
>> View Certificate of Correction for this publication
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| Country: |
US United States of America
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| Inventor: |
Tuck, Edward F.; West Covina, CA
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| Assignee: |
Teledesic Corporation, Kirkland, WA
other patents from TELEDESIC CORPORATION (710519) (approx. 10)
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| Published / Filed: |
1997-04-15
/ 1994-11-15
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| Application Number: |
US1994000340004
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| IPC Code: |
Advanced:
H01Q 1/28;
H04B 7/185;
H04B 7/204;
Core:
H01Q 1/27;
more...
IPC-7:
H01Q 3/00;
H04B 7/185;
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| ECLA Code: |
H01Q1/28F; H04B7/185S; H04B7/204B; T04B7/185M4;
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| U.S. Class: |
Current:
342/354;
342/358;
455/012.1;
455/013.3;
Original:
342/354;
342/358;
455/012.1;
455/013.3;
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| Field of Search: |
342/354,358
455/12.1,13.3
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| Priority Number: |
| 1994-11-15 |
US1994000340004 |
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| Abstract: |
Methods for transmitting and receiving radiated energy (15a, 15b, 15c) from and to a satellite (12) which moves with respect to the Earth's surface are disclosed. The invention pertains to any satellite (12) which is not in an equatorial orbit at geosynchronous altitude. The present invention reduces hand-off overhead in systems that utilize satellite-fixed cells, augments frequency re-use, and enhances the communications and sensing capacity of the satellite. In accordance with the methods of the invention, satellite footprints (16a, 16b, 16c) are partitioned into linear spanning cells (18) and multiple linear segments (22). The linear spanning cells (18) resemble long strips that extend across an entire footprint (16a, 16b, 16c). Multiple linear segments (22) are smaller contiguous areas that lie within the linear spanning cells (18). The alignment of the linear spanning cells (18) across a footprint (16a, 16b, 16c) is determined by a correction angle phi , which compensates for the changing relative motion of the Earth's surface at various latitudes.
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| Attorney, Agent or Firm: |
Anglin & Giaccherini ;
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| Primary / Asst. Examiners: |
Issing, Gregory C.;
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| Maintenance Status: |
E2 Expired Check current status
CC Certificate of Correction issued
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 8 claims |
What is claimed is:
1. A method for controlling the transmission of a beam of radiated energy (15a, 15b, 15c) to a terminal (P, M, F, G) from a position above the Earth (E) comprising the steps of:
- operating a satellite (12) in an Earth orbit (11);
- said satellite (12) having a track (T') with respect to a point on the Earth's surface while flying in a direction (T) at an altitude above the Earth (E) which is not an Equatorial geosynchronous altitude;
- said satellite (12) having a radiation interface (14);
- said radiation interface (14) being capable of transmitting said beam of radiated energy (15a, 15b, 15c) to said terminal (P, M, F, G);
- forming a footprint (16a, 16b, 16c) using said radiation interface (14) which is capable of transmitting said beam of radiated energy (15a, 15b, 15c) to said terminal (P, M, F, G );
- partitioning said footprint (16a, 16b, 16c) into at least one linear spanning cell (18);
- said linear spanning cell (18) extending across entire said footprint (16a, 16b, 16c);
- said linear spanning cell (18) having a longitudinal axis (20);
- aligning said longitudinal axis (20) of said linear spanning cell (18) continually, generally parallel to said track (T') of said satellite (12) on the Earth's surface; and
- directing said beam of radiated energy (15a, 15b, 15c) to said linear spanning cell (18) in said footprint (16a, 16b, 16c) by rotating the direction of said beam of radiation energy (15a, 15b, 15c) by an amount generally equal to a correction angle φ(L).
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 23 U.S. patent(s) that reference this one
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