Resources Contact Us Home
Satellite harmonic torque estimator

Image Number 9 for United States Patent #6672544.

A spacecraft embedded in a reference frame rotating relative to inertial space. The spacecraft generally includes actuators for maneuvering the spacecraft with respect to the reference frame, an attitude measurement device that measures the pitch and roll attitude of the spacecraft with respect to the reference frame, a control device adapted to keep the roll and pitch angles of the spacecraft close to the commanded roll and pitch angles, and a harmonic torque estimator adapted to read the commanded angular velocity of the spacecraft relative to an inertial frame, read momentum wheel speeds, read known predicted external torques and combine angular velocity, measured wheel speed and known external torque to produce an estimated observable periodic torque.

  Recently Added Patents
Liquid crystal display device with a control mechanism for eliminating images
Audio processing in a multi-participant conference
Anti-proliferative and anti-inflammatory agent combination for treatment of vascular disorders with an implantable medical device
Methods and apparatus for low power out-of-band communications
Touch screen tablet
Defected ground plane inductor
Fast and compact circuit for bus inversion
  Randomly Featured Patents
Electronic device with dual slide actuator that extends and retracts a connector
Methods for reconstructing missing packets in TTY over voice over IP transmission
Process of preparation of racemic hydroxyarylglycolic acids and novel products resulting therefrom
Process of coloring french fry potatoes
High-speed controlling device
Communication methods using slotted replies
Electrostatic and electrolytic loudspeaker assembly
Ultrasonic characterization of single drops of liquids
Special effect apparatus
Process for the manufacture of a double-base propellent composition with low flame-glare emission