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9004469 Space shuttle damping and isolating device  
A device used for providing dynamic isolation and damping of dynamic vibrations, in a passive way, originated in the launch vehicle of a space shuttle and reaching the payload or satellite. The...
8620496 Systems and method of controlling a spacecraft using attitude sensors  
A system for damping nutation and removing wobble of a spacecraft spinning about a given axis is provided. The system includes a sensor configured to determine three dimensional attitude...
8401717 Actuator control reducing the level of vibration of an associated flexible structure  
The aim of the method of controlling at least one mechanical system exhibiting at least one flexible structure element and at least one actuator or group of actuators is to reduce the level of...
8321076 On-line inertia estimation for use in controlling an aerospace vehicle  
A system for controlling an aerospace vehicle using on-line inertia estimation may include an attitude sensor to measure an attitude of the aerospace vehicle. The system may also include a...
7690602 Satellite active motion damping  
Methods and apparatus are provided for active motion damping of a spacecraft whose attitude control system (SACS) has experienced a partial failure. In a preferred embodiment, the apparatus...
7076341 Autonomous manoeuvring for spinning spacecraft  
An inventive autonomous active manoeuvring method and system 1 for spinning spacecraft is provided having a capability to enhance the AOCMS performance of passive spinning satellites and to fulfil...
6705573 Survivability and mission flexibility enhancements for reconnaissance aircraft  
A pod (34) containing sensors and/or targeting systems such as laser designators or range finders are hung on a cable (30) below an aircraft (12). The line (30) can be reeled in or out similar to...
6672543 Compact mechanism for retrieval of a towed body from moving vehicles  
Recovery of a towed body, in one embodiment in the form of a decoy which is initially stowed in a receptacle or canister and which is allowed to pay out behind an aircraft on a towing cable...
6634861 Power plant for propeller aircraft  
A power plant for propeller aircraft has two propulsion devices, each having a propeller, an engine for powering the propeller, and a gear transmission interposed between the engine and the...
6499699 Satellite attitude control system and method  
A satellite attitude control system includes a programmed processor system which includes a gyroscopic actuator first control stage for changing the attitude of the satellite and a reaction wheel...
6439509 Pre-bias scheme for roll momentum unloads on pitch momentum bias/yaw reaction wheel spacecraft  
An automatic, on-board system for orbiting spacecraft that controls and reduces short-term transients caused by roll momentum unloads by manipulating the states of the nutation damper through...
6341750 Spacecraft motion estimation using a gimballed momentum wheel  
A method for estimating motion of a dual-spin spacecraft having a gimballed momentum wheel. The method disengages the gimbal from its drive train in anticipation of a short disturbance. Then, the...
6290183 Three-axis, six degree-of-freedom, whole-spacecraft passive vibration isolation system  
The excitations from the engines of launch vehicles and the aerodynamics of flight produce large vibrations which are highly detrimental to spacecraft during launch. Significant dynamic loads...
6289268 Attitude determination system and method  
A star tracker coupled to the spacecraft having a star catalog associated therewith. A sun sensor is coupled to the spacecraft. A control processor is coupled to the star tracker and the sun...
6199801 Whole-spacecraft passive isolation devices  
Excitations from engines of the launch vehicles and the aerodynamics of flight produce large vibrations which are very detrimental to spacecraft during launch. Whole-spacecraft vibration isolation...
6138061 Onboard orbit propagation using quaternions  
A method for controlling orbiting spacecraft uploads a plurality of parameters to an onboard processor, the parameters including a plurality of quaternion elements describing an inertial to orbit...
6062512 Wobble and nutation control, and spin stabilization for a spacecraft using momentum conserving devices  
A method of damping nutation and removing wobble of a spacecraft provided with first and second momentum sources having linearly independent momentum components in the plane transverse to the...
6003817 Actively controlled thermal panel and method therefor  
One or more deployable thermal panels (24, 28, 70) are actively controlled throughout the orbit of a satellite (20) to provide thermal dissipation. Adjusting the incident angle between the panel...
6000661 Autonomous spacecraft payload base motion estimation and correction  
A feedback motion compensation (FMC) component for use in a spacecraft having a payload. The FMC component includes a controller having sensor data inputs and an open loop dynamics model that is...
5957410 Earth oriented satellite and process for controlling the position, nutation and spin  
A low earth orbiting satellite control arrangement according to the invention has an earth sensor for measuring roll and pitch of the satellite relative to an earth oriented moving reference...
5906339 Multiple axis solar sailing  
In a satellite (20), two-axis solar panel drives (56, 58) allow two degrees of rotational freedom of movement for solar panels (22, 24). Regulation of electrical current loops (46, 48) within the...
5884869 Satellite spin vector control with sun sensor  
A method for simultaneously controlling satellite nutation, sun angle and attitude walk using a dual-slit sun sensor and thrusters. The sun angle and nutation angles are computed from sun sensor...
5826828 Sun/earth acquisition without thrusters  
Methods for performing attitude maneuvers of a spinning satellite without the use of thrusters, or with a minimal number of thrusters, are disclosed. The attitude maneuvers are primarily achieved...
5816538 Dynamic decoupler for improved attitude control  
The invention provides a method for controlling the precession of a spinning spacecraft (20) which allows the spacecraft body to respond to an input torque without the nutation normally attendant...
5794892 Critical nutation dampling on spinning bodies via momentum wheels or similar devices  
A method and system of damping nutation of a spacecraft (20) having a desired spin axis along a first principal inertia axis utilizes a momentum source (28) oriented along a second principal...
5752675 Thruster control of yaw without yaw measurements  
An automatic, on-board system for orbiting spacecraft that controls yaw excursions caused by solar torques and thruster firings, which system combines inputs indicative of roll and yaw momentum...
5702067 Method and apparatus for determining the angular momentum vector of a satellite  
The invention relates to a method for determining the angular momentum vector of a satellite, located in an external magnetic field, relative to a satellite-integral orthogonal system of...
5597143 Process and a device for controlling the attitude of a three-axis stabilized spinning spacecraft  
The invention provides an improved process and apparatus for controlling the attitude of a three-axis stabilized spacecraft. Separate dead zone elements are used to define threshold values for...
5597141 Efficient mass translation device  
A dynamic balance mechanism for balance control of a gyro stabilized (spinning) satellite is disclosed. An elongated gear rack is attached to the spacecraft. A movable mass is mounted by guide...
5582369 Method of minimizing, damping or compensating disturbances to a spin-stabilized satellite  
For using, on a spin-stabilized satellite, an actuator having an active axis substantially parallel to the spin axis wherein the actuator is activated in a predetermined mode and the resulting...
5395076 Spacecraft velocity change maneuvers by variable arcjets  
A spacecraft uses monopropellant arcjets for velocity change such as for north-south stationkeeping. It has been discovered that, while an arcjet cannot be modulated by pulsing the fuel supply,...
5308025 Spacecraft spin axis capture system and method  
A control system and method for causing a spacecraft (10) initially spinning about a principal axis of inertia (H) to transition to spin about an arbitrary command axis (3) is presented in which...
5222023 Compensated transition for spacecraft attitude control  
An improved method for transitioning a spacecraft from a thruster (5) controlled, station keeping mode to an operational, on-orbit mode, in which attitude control is maintained using internal...
5201833 Attitude control system with reaction wheel friction compensation  
A spacecraft attitude control system uses one or more momentum or reaction wheels. Wheel bearing viscous (velocity-dependent) friction reduces the actual torque imparted to the spacecraft in...
5139217 Passive damper for spin stabilized projectiles  
A stabilizer comprised of a pair of toroidal fluid passages filled with a viscous fluid orthogonally mounted with respect to one another on a spin stabilized projectile. One torus is rigidly...
5062593 Solid-propellant-powered maneuvering system for spacecraft  
An improvement to a variable-pressure solid-propellant-powered maneuvering ystem for spacecraft, enabling the system to operate for longer than one propellant burn time. At least two solid...
5042752 Apparatus for controlling the attitude of and stabilizing an elastic body  
A device is disclosed for regulating a set value and/or for stabilizing elastic objects subject to spin and free to move around their axis of rotation, in particular aircraft and spacecraft. For...
4947067 Vibrator/dampener having magnetic suspension and servo-control along three axes  
A combination vibration generator and dampener having magnetic suspension and servo-control along three axes includes a hollow outer body fixed to a structure whose vibration is to be controlled,...
4931942 Transition control system for spacecraft attitude control  
A method for controlling transition from thruster control to momentum wheel control to minimize nutation angle and transition time in a three-axis stabilized spacecraft employing an internal body...
4927101 Method for tilting the moment of inertia of a rotating free body in space into any given direction  
In order to shift the moment of inertia Hi of a body in rotation initially in rotation approximately about its principal axis of inertia Z into any given orientation HF one applies transversely to...
4922159 Linear precision actuator with accelerometer feedback  
A high precision linear actuator for compensating short stroke, high frequency vibrations in a space deployed structure comprises a set of cylindrical magnetic pole pieces affixed to respective...
4897582 Linear dc motor vibration controller  
A linear force actuator system for stabilizing a support structure employs a linear dc motor whose primary winding is driven by a pulse width modulation control signal representative of a force...
4843294 Solar array stepping to minimize array excitation  
Mechanical oscillations of a mechanism containing a stepper motor, such as a solar-array powered spacecraft, are reduced and minimized by the execution of step movements in pairs of steps, the...
4824052 Nutation sensor and nutation control system for a dual-spin stabilized satellite  
A nutation sensor and nutation control system using a relative spin phase sensor in a dual-spin stabilized satellite is disclosed. The relative spin phase sensor provides index pulses indicative...
4776540 Method of orienting a synchronous satellite  
The invention is a method of orienting a satellite in a geosynchronous orbit so as to direct a beam from an antenna mounted on the satellite to cover a desired target site, and pointing the beam...
4732354 Active damping of satellite nutation  
For controlling nutation of a three-axis stabilized satellite, the angular speed of a solar panel carried by the satellite is selectively and temporarily varied about an average value for...
4728062 Pivot actuated nutation damping for a dual-spin spacecraft  
A nutation damping control for a dual-spin satellite is provided by tilting the axis of the rotor relative to the normal spin axis of the satellite and back a half nutation period later. The...
4591117 Spacecraft nutation damping  
An active nutation damping system for a spacecraft may comprise a nutation sensor controlling an actuator, a thruster say, via a control system so as to produce nutation opposing torques....
4516746 Nutation damper system comprising a control member for varying a natural frequency of a pendulum  
In a nutation damper system which includes a pendulum (30, 33, 34, 38) swingable at a natural frequency and a block element (35) which cooperates with the pendulum to damp nutations having a...
4504032 Control of nutation in a spacecraft  
A method and apparatus for damping nutation in a spacecraft to essentially zero in less than one nutation period which has a spin axis, first and second transverse axes and a characteristic...

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