Constellation of spacecraft, and broadcasting method using...

Details Constellation of spacecraft, and broadcasting method using... Constellation of spacecraft, and broadcasting method using...

2005-02-08

2005-02-08

Poon, Peter M. (Department: 3643)

Aeronautics and astronautics

Spacecraft

Spacecraft formation, orbit, or interplanetary path

C244S164000, C244S171000, C455S427000

Reexamination Certificate

active

06851651

ABSTRACT:
In general, a constellation of spacecraft is used to broadcast to a particular region with high angles of view in order to reduce blockage or shadowing. A constellation of a plurality of spacecraft is placed in 24-hour orbits having inclination of about 55°, eccentricity of about 0.32, semi-major axis of about 42,000 km, longitude of the ascending node of about 43° East, argument of perigee of about 270°, and longitude of the ground track at maximum latitude of about 7° East. The preferred number of spacecraft ranges from three to six. In a particular application of Digital Audio Broadcast to Europe in some embodiments, the most populous cities are provided with service from no more than about 10° from vertical, and broadcast takes place when the spacecraft are above at least 35° North latitude. The broadcast power is reduced during those portions of the orbit in which the ground track lies in the Southern hemisphere.

REFERENCES:
patent: 4943808 (1990-07-01), Dulck et al.
patent: 6223019 (2001-04-01), Briskman et al.
patent: 6564053 (2003-05-01), Briskman et al.
patent: 20020177403 (2002-11-01), LaPrade et al.

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