Aeronautics and astronautics – Spacecraft – Attitude control
Reexamination Certificate
2011-04-05
2011-04-05
Dinh, Tien (Department: 3644)
Aeronautics and astronautics
Spacecraft
Attitude control
C244S158800
Reexamination Certificate
active
07918420
ABSTRACT:
The present system and methods enable simultaneous momentum dumping and orbit control of a spacecraft, such as a geostationary satellite. Control equations according to the present system and methods generate accurate station-keeping commands quickly and efficiently, reducing the number of maneuvers needed to maintain station and allowing station -keeping maneuvers to be performed with a single burn. Additional benefits include increased efficiency in propellant usage, and extension of the satellite's lifespan. The present system and methods also enable tighter orbit control, reduction in transients and number of station-keeping thrusters aboard the satellite. The present methods also eliminate the need for the thrusters to point through the center of mass of the satellite, which in turn reduces the need for dedicated station-keeping thrusters. The present methods also facilitate completely autonomous orbit control and control using Attitude Control Systems (ACS).
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Dinh Tien
Gumpel Charles S.
The Boeing Company
Yee & Associates P.C.
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