Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Aeronautical vehicle
Reexamination Certificate
2006-06-15
2008-05-20
Hellner, Mark (Department: 3663)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Aeronautical vehicle
C244S164000
Reexamination Certificate
active
07376496
ABSTRACT:
Momentum control is maintained in a geosynchronous orbiting spacecraft that uses a plurality of reaction wheel assemblies and a plurality of magnetic torquers to control the spacecraft momentum, each orbit of the spacecraft being comprised of a set of time steps, by determining a current momentum error for a current time step of a current orbit by adding a system momentum change determined for an immediately preceding orbit to an average system momentum determined for the immediately preceding orbit, and then subtracting a magnetic control torque momentum change determined for the immediately preceding orbit, determining a current duty cycle for each of the magnetic torquers based on the current momentum error and on a torque value applied by each magnetic torquer at each time step of the immediately preceding orbit, and commanding each magnetic torquer to operate at the current time step in accordance with its respective determined current duty cycle, wherein the magnetic torquers apply a magnetic momentum control torque to the spacecraft to offset the current momentum error.
REFERENCES:
patent: 6517029 (2003-02-01), Holmes
patent: 7149610 (2006-12-01), Wang et al.
patent: 2005/0049764 (2005-03-01), Wang et al.
patent: 2007/0083345 (2007-04-01), Fowell
Goodzeit Neil E.
Ratan Santosh
Weigl Harald J.
Hellner Mark
Lockheed Martin Corporation
McDermott Will & Emery LLP
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