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4916622 |
Attitude control system
An attitude control system using magnetic torquing is enhanced using a momentum wheel which is pivoted if the sensed error signal about the roll axis exceeds a given threshold. The momentum wheel...
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4883244 |
Satellite attitude determination and control system with agile beam sensing
Agile (electronically steerable) beam sensing with associated on-board processing, previously used exclusively for positioning of antennas for beam formation and tracking in communications systems,...
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4807835 |
Spacecraft attitude stabilization system
The attitude of a spacecraft can be effectively controlled in three axes using the combination of a gravity gradient boom and three electromagnets. The electromagnets are controlled according to a...
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4746085 |
Method for determining the earth's magnetic field and a satellite's attitude for attitude control
A method for determining the earth's magnetic field and, selectively, additionally, for determining a satellite orientation as a premise for the attitude control of an earth satellite in a known...
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4661737 |
Electrical machines with multiple axes of rotation
Electrical machine including a base member, a rotor and a stator. The base member has a first magnetically permeable body with a first winding arrangement. The rotor has a second magnetically...
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4504912 |
Satellites and roll/yaw controls therefor
In the disclosed satellite and arrangement therefor, roll or yaw of a satite with pitch momentum bias and travelling on a substantially polar orbit with the aid of a coil interacting with the...
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4489383 |
Closed-loop magnetic roll/yaw control system for high inclination orbit satellites
A closed-loop magnetic roll/yaw control system for high inclination satellites where the predominant component of the geomagnetic field lies in the orbit plane of the satellite. The system includes...
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4483570 |
Magnetic bearing arrangement for an artificial satellite
A magnetic bearing arrangement for rotor for controlling the attitude of an artificial satellite wherein the rotor has a rotating speed and an axis of rotation which are adjusted in accordance with...
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4424948 |
Magnetically torqued nutation damping
A system for actively damping nutation of a satellite and/or aligning the pitch axis of a momentum bias satellite with some external reference includes a magnetic torquing means which is energized...
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4325586 |
Electromagnetic process for controlling orientation of a platform and platform for carrying out said process
Electromagnetic method and apparatus to accurately control the orientation of a platform according to two axes wherein pivoting of the platform about two orthogonal axes passing through its center...
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4170904 |
Single-axis disturbance compensation system
The invention relates generally to an improved system for sensing and compensating for external disturbance forces acting on a satellite while in orbit. A proof mass member is housed within an...
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4168048 |
Eddy current nutation damper with progressive damping factor
A nutation damper apparatus capable of damping small nutation angles in a satellite. A permanent magnet mounted on the free end of a pendulum arm oscillates back and forth parallel to an adjacent...
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4164018 |
Method and apparatus for steering a spacecraft and regulating its onboard supply voltage
The invention relates generally to a method of regulating the onboard voltage of a spacecraft and of steering the same by at least two contrarotating motor-generator dynamoelectrical machines....
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4114841 |
Magnetic torquing system for changing the spin rate of an orbiting satellite
The angular momentum of a tumbling orbiting satellite is changed to reduce the spinning of the spacecraft such that the spacecraft can operate in an essentially stabilized condition. The change in...
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4084773 |
Magnetic control of spacecraft roll disturbance torques
For a spacecraft in an equatorial or low inclination orbit predictable roll disturbance torques due principally to solar radiation pressure are minimized by interacting a magnetic dipole oriented...
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4084772 |
Roll/yaw body steering for momentum biased spacecraft
Roll and yaw attitude errors introduced by orbit inclination deviations from the nominal orbit plane are minimized by sinusoidally varying the momentum produced by a transverse wheel mounted on the...
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4071211 |
Momentum biased active three-axis satellite attitude control system
Control of an active three-axis multiple-wheel attitude control system is provided with a bias momentum to achieve stiffness about the pitch axis. With this stiffness, the system overcomes the...
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4065189 |
Magnetically suspended angular momentum wheel
A momentum wheel wherein friction has been substantially eliminated by replacing mechanical bearings with a magnetic suspension. The rotor of the momentum wheel, in the form of a circular disk...
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4062509 |
Closed loop roll/yaw control system for satellites
Attitude of a pitch momentum biased satellite in a low inclination orbit is controlled by a closed loop magnetic torquing control system. A magnetic dipole oriented perpendicular to the satellite's...
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4034941 |
Magnetic orientation and damping device for space vehicles
A bar magnet is suspended by torsion wires and a ring inside a spherical frame rigidly attached to the space vehicle. The frame is filled with a damping fluid and damping domes are attached to each...
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RE29177 |
Solar torque compensation for a satellite
A satellite is compensated for torques caused by solar pressure on a solar panel extending from the satellite by an air core coil energized to develop a magnetic torque in opposition to the solar...
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4010921 |
Spacecraft closed loop three-axis momentum unloading system
A system for autonomously unloading accumulated angular momentum on space craft reaction wheels in the attitude control systems with external torques generated by the interaction of spacecraft...
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3955858 |
Satellite momentum wheel
The invention provides a satellite momentum wheel with passive magnetic centering means, between a stator and a rotor comprising at least one passive radial magnetic centering device, at least one...
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3838834 |
SOLAR TORQUE COMPENSATION FOR A SATELLITE
A satellite is compensated for torques caused by solar pressure on a solar panel extending from the satellite by an air core coil energized to develop a magnetic torque in opposition to the solar...
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3834653 |
CLOSED LOOP ROLL AND YAW CONTROL FOR SATELLITES
A magnetic torquing control system for the attitude control of pitch momentum biased satellites utilizing a closed loop for roll-axis control by interacting the satellite's magnetic dipole with the...
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3785595 |
SYSTEM FOR SENSING AND COMPENSATING FOR THE DISTURBANCE FORCES ON A SPACECRAFT
An improved system for sensing the disturbance forces on a spacecraft. An supported mass is shielded by the spacecraft from external non-gravitational forces, allowing the mass to travel in a...
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3765621 |
SYSTEM OF CONTROLLING THE ATTITUDE OF A SPINNING SATELLITE IN EARTH ORBITS
A system of controlling the attitude of a spinning satellite by controlling a satellite-borne magnetic control element according to a switching function S defined by S = E . (k B × B) where E =...
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3698661 |
CONTROLLABLE HYSTERESIS DAMPING
The invention relates generally to spacecraft attitude stabilization in wh magnetic hysteresis damping rods are employed to damp rapid or relatively large oscillations of a spacecraft. In...
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3681583 |
DEVICE FOR CONTROLLING THE ATTITUDE OF A SPACE SATELLITE UTILIZING GEOMAGNETIC FIELD
The present invention enables the attitude of a spinning satellite to be effectively controlled by introducing current through an attitude control coil wound around the spin axis so as to allow the...
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3652033 |
MAGNETIC HYSTERESIS-LOSS DAMPING RODS
An improved damping rod structure, for dissipating undesired satellite mon by magnetic hysteresis and shorted coil damping, which provides increased damping capability for a given weight of...
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3534925 |
CARTWHEEL SATELLITE SYNCHRONIZATION SYSTEM
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3533577 |
SPACECRAFT STABILIZATION AND ROTATION SYSTEM
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3510705 |
VARIABLE FORCE MAGNETIC HYSTERESIS DEVICE
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3497160 |
HYSTERESIS DAMPER
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3493798 |
HYSTERETIC DAMPER
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3489372 |
SATELLITE SPIN CONTROL SYSTEM
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3456900 |
ENHANCED MAGNETIC DAMPING SYSTEM
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3429524 |
ATTITUDE CONTROL SYSTEM
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3428789 |
CONTROL APPARATUS
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3423614 |
INSIDE-OUT MOTION DAMPER
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3421715 |
SPACE NAVIGATION SYSTEM
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3416749 |
Magnetic hysteresis apparatus
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3399317 |
Motion damper
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3392941 |
Magnetohydrodynamic rudder for reentry device
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3390847 |
Earth's orientation of satellite antenna
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3390848 |
Magnetic torquing of spin axis stabilization
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3369770 |
Drag free spacecraft
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3370205 |
Magnetic suspension system
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3367605 |
Radiation-operated attitude control
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3358945 |
Attitude stabilizing means
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