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9038958 Method and apparatus for contingency guidance of a CMG-actuated spacecraft  
Methods and apparatus are presented for spacecraft operation using non-Eigen axis attitude transitions via control momentum gyroscopes (CMGs) to avoid or mitigate singularities by providing a...
8998146 Spacecraft momentum unload and station-keeping techniques  
Spacecraft momentum management techniques are coordinated with station-keeping maneuvers or other delta-V maneuvers. A body stabilized spacecraft attitude is controlled, the spacecraft including...
8876060 Split flywheel assembly with attitude jitter minimization  
Various embodiments of the present invention include assemblies and methods for minimizing the amplitude of attitude jitter. In one embodiment, a split flywheel assembly includes a plurality of...
8880246 Method and apparatus for determining spacecraft maneuvers  
Methods and apparatus are presented for spacecraft operation in which a control problem is formulated using a control law or steering law as a path constraint or as a dynamic constraint, and the...
8798816 Method and system for unloading the inertia wheels of a spacecraft  
The method for unloading the inertia wheels of a spacecraft comprising three references axes X, Y, Z, the axis Z corresponding to a pointing direction, consists in inverting the direction of...
8688296 Method for maximum data collection with a control moment gyroscope controlled satellite  
The present invention relates to a method for maneuvering an imaging satellite, and more particularly a method for commanding control moment gyroscopes on an imaging satellite to change 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...
8413931 System and method for reducing attitude errors for exoatmospheric devices  
An exoatmospheric device comprises an inertial measurement unit comprising a spin axis gyroscope adapted to obtain data regarding angular rotation of the exoatmospheric device about a spin axis,...
8412391 Proximity spacecraft maneuvering  
Provided is a method and system for maneuvering a first spacecraft relative to a nearby second spacecraft that occupies a finite volume of space including obstacles in the vicinity of the second...
8380370 Spacecraft acquisition maneuvers using position-based gyroless control  
A system and a method for commanding a spacecraft to perform a three-axis maneuver purely based on “position” (i.e., attitude) measurements. Using an “inertial gimbal concept”, a set of formulae...
8346410 Method for improving maneuverability and controllability by simultaneously applying both reaction wheel-based attitude controller and thruster-based attitude controller  
Provided are an attitude control system and method of a spacecraft of an artificial satellite that may enhance a maneuverability and a controllability by simultaneously applying a reaction wheel...
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...
8315749 Innovative optimal spacecraft safing methodology  
A system and method are disclosed for an innovative spacecraft (S/C) safing methodology. The system and method use wheel momentum to perform a rotisserie rotation so that the spacecraft can slew...
8282044 Actuator device for varying the attitude of a spacecraft  
An actuator device for varying the attitude of a spacecraft includes a reversible conversion chain of electrical energy to mechanical rotation energy of a flywheel. The electrical energy is stored...
8209070 Methods and systems for efficiently orienting an agile vehicle using a gyroscope array  
Methods and systems are provided for orienting an agile vehicle using a control moment gyroscope array. A method comprises obtaining initial vehicle parameters for the vehicle and obtaining target...
8209065 Steering logic for spacecraft slew maneuvers  
Spacecraft control modules can steer a spacecraft during a slew maneuver. The spacecraft control modules can receive a target attitude for the spacecraft slew maneuver. An angle between a current...
8205838 Electrostatic spacecraft reorbiter  
Spacecraft vehicles and methods for providing reorbiters capable of moving target objects are provided. More particularly, a reorbiter utilizing electrostatic or Coulomb force for acting on target...
8155819 System and method for effecting vehicle maneuver to compensate for IMU error  
The effects of IMU gyro and accelerometer bias errors are significantly reduced in accordance with the present teachings by a system or method for commanding an IMU or vehicle through a series of...
8113468 Precision attitude control system for gimbaled thruster  
A system for providing attitude control with respect to a spacecraft is provided. The system includes a reaction wheel control module configured to control a number of reaction wheel assemblies...
8066226 Inertial propulsion device to move an object up and down  
Disclosed herein are two separate processes that do not require a propellant and do not produce an equal and opposite reaction against any external form of matter in the Local Inertial Reference...
8056863 Unified attitude control for spacecraft transfer orbit operations  
A method of controlling attitude of a spacecraft during a transfer orbit operation is provided. The method includes providing a slow spin rate, determining the attitude of the spacecraft using a...
8052093 Control moment gyro and device for assembly thereof  
The gyrodyne includes an inertial wheel mounted, via a wheel support, on the moving part or rotor of a cardan assembly. The cardan assembly is provided with a stator and the rotor is rotatable...
8038101 Attitude change control method, attitude change control system, attitude change control program and program recording medium  
Disclosed is an attitude change control system that is designed to efficiently output a torque for attitude change of a space craft using CMGs and realizes a real time CMG driving rule. A CMG...
8020809 Direct torque actuator control for control moment gyroscope  
A control moment gyroscope system for delivering a target torque to a spacecraft including a rotor assembly having a rotor and a motor to spin the rotor about a rotor axis. A gimbal assembly has a...
8014911 Methods and systems for imposing a momentum boundary while reorienting an agile vehicle with control moment gyroscopes  
Methods and systems are provided for reorienting an agile vehicle, such as a satellite or spacecraft, using a control moment gyroscope (CMG) array. The CMG array comprises a plurality of CMGs...
7988097 Precision attitude control system for gimbaled thruster  
A system for providing attitude control with respect to a spacecraft is provided. The system includes a reaction wheel control module configured to control a number of reaction wheel assemblies...
7974746 Singularity escape and avoidance using a virtual array rotation  
Techniques for providing singularity escape and avoidance are disclosed. In one embodiment, a method for providing control moment gyroscope (CMG) attitude control singularity escape includes...
7904214 Singularity escape and avoidance using a virtual array rotation  
Techniques for providing singularity escape and avoidance are disclosed. In one embodiment, a method for providing control moment gyroscope (CMG) attitude control singularity escape includes...
7805226 Hierarchical strategy for singularity avoidance in arrays of control moment gyroscopes  
A control system for adjusting the attitude of a spacecraft comprises a set of control moment gyroscopes (CMGs) configured to allow null space maneuvering. The control system further comprises a...
7800334 Drive system  
The invention relates to a drive system comprising a control unit (1), which is connected to drive units (3a, 3b, 3c, 3d, 3e, 3f, 3g) via a data bus (2) for the exchange of data. According to the...
7721998 Self-powered spacecraft attitude control system and method  
A system and method are provided for operating a control moment gyro (CMG) in a spacecraft. The CMG includes a spin motor, and a CMG rotor that is coupled to the spin motor and is configured to...
7693619 Method and system for controlling sets of collinear control moment gyroscopes with offset determination without attitude trajectory of spacecraft  
A control system of a spacecraft for controlling two or more sets of collinear control moment gyroscopes (CMGs) comprises an attitude control system. The attitude control system is configured to...
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...
7661627 Method of controlling the attitude of satellites, particularly agile satellites with a reduced number of gyrodynes  
A method of controlling the attitude of a satellite (1) including two gyrodynes (3,4) and a third main actuator (2) which delivers torques at least along the Z axis. The method includes: fixing...
7654490 Precision attitude control system for gimbaled thruster  
A system for providing attitude control with respect to a spacecraft is provided. The system includes a reaction wheel control module configured to control a number of reaction wheel assemblies...
7627404 Singularity escape and avoidance using a virtual array rotation  
Techniques for providing singularity escape and avoidance are disclosed. In one embodiment, a method for providing control moment gyroscope (CMG) attitude control singularity escape includes...
7561947 Dynamic CMG array and method  
Methods and apparatus are provided for reorienting control moment gyros (CMGs) to compensate for CMG failure or change in spacecraft (S/C) mass properties or mission. An improved CMG comprises a...
7554237 Centrifugal-effect vibration generator having coaxial contrarotating rotors  
A device for generating forces that are variable and controllable in amplitude, in direction, and in frequency, the device includes two unbalanced rotors (18, 20, 35 to 38) mounted coaxially in a...
7512466 High-torque, low power reaction wheel array and method  
Methods and apparatus are provided for reaction wheel (RW) assemblies for spacecraft. The apparatus comprises a M/G coupled to an inertia wheel and a controller coupled to the M/G that, in...
7464899 Method and system for determining a singularity free momentum path  
A method for avoiding singularities in the movement of CMGs in an array of CMGs in a spacecraft includes a first step where a maneuver command to rotate a spacecraft orientation is received. Then,...
7407137 Dual voltage integrated power and attitude control system and method  
An integrated power and attitude control system and method for a vehicle efficiently supplies electrical power to both low voltage and high voltage loads, and does not rely on relatively heavy...
7370833 Method and system for determining a singularity free momentum path  
A method for avoiding singularities in the movement of a set of collinear CMGs in an array of CMGs in a spacecraft is provided. First, a command to adjust an orientation of the spacecraft is...
7367529 Momentum tube for distributed actuation  
An spacecraft control system is provided that includes a tube and a plurality of microwheels. The plurality of microwheels is disposed within the tube. Each microwheel has a first stator wafer, a...
7364120 Quantized control-moment gyroscope array  
A momentum actuator for steering a spacecraft is disclosed. The momentum actuator comprises a rotor, a gimbal upon which the rotor is mounted, and a stepper motor coupled to the gimbal and...
7290737 Nonsurvivable momentum exchange system  
A demiseable momentum exchange system includes a base and a flywheel rotatably supported on the base. The flywheel includes a web portion defining a plurality of web openings and a rim portion....
7273196 System for vehicle attitude and/or momentum control  
A vehicle control system is provided that includes a slat having an axis, a plurality of microwheels disposed on the slat, each microwheel having a first stator wafer, a second stator wafer, and a...
7246776 Method and system for CMG array singularity avoidance  
The present method provides a method for avoiding singularities in the movement of CMGs in an array of CMGs in a spacecraft. In a first step, a torque command representing a desired torque to...
7248967 Autonomous velocity estimation and navigation  
Measurement of a spatial velocity vector in order to make determination of a geographical position possible. A spatial velocity meter includes an inertial measurement unit, a direction-sensing...
7216036 Integrated inertial stellar attitude sensor  
An integrated inertial stellar attitude sensor for an aerospace vehicle includes a star camera system, a gyroscope system, a controller system for synchronously integrating an output of said star...
7198232 Optimal speed management for reaction wheel control system and method  
A spacecraft attitude control system and method in which an attitude controller is configured for sensing three-dimensional attitude of the spacecraft, and producing torque signals for stabilizing...

Matches 1 - 50 out of 311 1 2 3 4 5 6 7 >