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
Method and apparatus for providing seamless call handoff between networks that use dissimilar transmission methods
Rewarding independent influencers
Fixture for camera attachments
Methods and systems for distributing broadcast messages on various networks
Reception circuit and signal reception method
Multi-carrier operation for wireless systems
Semiconductor device and method of manufacturing the same
  Randomly Featured Patents
Welding shielding gas flow rate-limiting apparatus
7-ethylene-.alpha.-(methoxymethylene)-1-naphthalene-acetic acid
Calibration of color reproduction apparatus for similar receivers from different coating events
Determining and disclosing the indentity of telephone caller
Interconnect line selectively isolated from an underlying contact plug
System and method for disk software publishers to control disk distribution
Computer system with digital micromirror device
Low power transmitter frequency stabilization
Cofinger and device