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7407131 |
Method for creating an aeronautic sound shield having gas distributors arranged on the engines, wings, and nose of an aircraft
The present invention blocks and/or attenuates the upstream travel of acoustic disturbances or sound waves from a flight vehicle or components of a flight vehicle traveling at subsonic speed using...
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7185857 |
Thrust vector actuation control system and method
A thrust vector actuation control system and method is configured to allow self-testing of the entire actuation system and/or its individual system components. The control system also provides...
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7118075 |
System and method for attitude control and station keeping
A system and method for supplying thrust to a structure, such as a satellite or spacecraft, for the purposes of station keeping and attitude control of the structure in low-gravity (orbital) and...
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7059571 |
Deployable spacecraft mount for electric propulsion
An apparatus and method including a deployable spacecraft mount for electric propulsion is disclosed. A typical apparatus includes a spacecraft body, a deployable element having at least two basic...
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6990396 |
Method and apparatus for reaction wheel dynamic compensation in long-duration deployment of a large reflector
A method and an apparatus for controlling the attitude and momentum of a spacecraft while deploying an appendage from the spacecraft. The method comprises the steps of predicting an environmental...
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6945500 |
Apparatus for a geosynchronous life extension spacecraft
A satellite life extension spacecraft, comprising a mechanical implement adapted for connection to a parent spacecraft, a first and second boom, a first thruster pod and a second thruster pod...
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6921049 |
System for counteracting a disturbance in a spacecraft
A system for counteracting a disturbance in a spacecraft includes a biasing apparatus that is coupled to the spacecraft and a spacecraft controller within the spacecraft. The disturbance has a...
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6908064 |
High-efficiency REA optimized stationkeeping
A velocity change (ΔV) thruster is operated on a spacecraft, which unavoidably causes attitude error. A reaction wheel (RWA) corrects the attitude. At the beginning of the thruster maneuver, the...
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6883757 |
System and method for increasing the roll offset operating range for a spacecraft
A method for increasing the roll offset operating range for a spacecraft using an earth sensor operating in single scan mode includes the steps of moving the spacecraft to a first roll position,...
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6820411 |
Compact, lightweight high-performance lift thruster incorporating swirl-augmented oxidizer/fuel injection, mixing and combustion
An apparatus for providing propulsive power that utilizes a novel swirl generator for rapidly and efficiently atomizing, vaporizing, as necessary, and mixing a fuel into an oxidant. The swirl...
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6695251 |
Method and system for synchronized forward and Aft thrust vector control
A system for controlling attitude about pitch, yaw, and roll axes and axial thrust of a body. The system comprises a main thrust generator located on an aft portion of the body and at least one...
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6637701 |
Gimbaled ion thruster arrangement for high efficiency stationkeeping
An attitude control system for a spacecraft that includes a north side, a south side, an east side, a west side, an earth facing side, and an anti-earth facing side. The attitude control system...
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6622969 |
Maneuver device for artificial satellite
The present invention provides a maneuver device for an artificial satellite, which causes small attitude error during maneuver and which requires a shorter period of setting time for obtaining a...
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6598385 |
Two stage gas pilot valve controlling gas flow to a reaction jet nozzle
A multi-stage pilot valve is disclosed for selectively supplying a working fluid to and venting from a reaction jet main stage actuation chamber. In a preferred embodiment of the invention, the...
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6585193 |
Spacecraft with integrated pulsed-plasma thrusters
Various ways of integrating pulsed plasma thrusters with a spacecraft. In one embodiment, pulsed plasma thrusters are mounted on inflatable struts/booms. In another embodiment, pulsed plasma...
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6581880 |
Energy managed electric propulsion methods and systems for stationkeeping satellites
An electric propulsion (EP) device is used to enable, a stationkeeping satellite to track a prescribed stationkeeping Earth orbit. EP propellant and electric power are throttled to vary the thrust...
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6577929 |
Miniature attitude sensing suite
The present invention provides methods of and apparatus for determining the inertial attitude of an aerospace vehicle. In one embodiment, the invention provides a rotational astronomical...
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6565043 |
Redundant system for satellite inclination control with electric thrusters
A thruster system for spacecraft includes a thruster, a thruster mounting boom, a gimbals mechanism connecting the thruster to the thruster mounting boom, and a pivot mechanism connected to the...
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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...
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6494402 |
Lateral exhaust microthruster
A microthruster having an inverted exhaust system traps burst diaphragm fragments providing a clean exhaust while an exhaust port provides increased back pressure for efficient combustion of a...
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6481672 |
Gimbaled thruster control system
A method for controlling spacecraft velocity. A thruster torque gimbal angle command is calculated to provide a desired thruster torque demand command including a desired momentum adjust torque and...
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6439507 |
Closed-loop spacecraft orbit control
A spacecraft orbit control system and method that provides orbit control of a spacecraft. The system comprises the spacecraft, one or more electric and/or chemical thrusters disposed on the...
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6439122 |
Separation system for missile payload fairings
In detail, the system includes at least one first pulley mounted on the first structural member and at least one-second pulley mounted on the second structural member. A cable is attached by one...
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6435457 |
Thruster systems for spacecraft station changing, station keeping and momentum dumping
Spacecraft thruster systems are provided that can realize station changing, station keeping and momentum dumping in spacecraft while minimizing loss of spacecraft service time. The systems are...
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6378292 |
MEMS microthruster array
A microelectrical mechanical system (MEMS) microthruster array is disclosed. The MEMS microthruster array of the present invention can be used for maintaining inter satellite distance in small...
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6341762 |
Service valve and use of same in reaction control system
Various types of valves are disclosed, as well as the use of the same in a reaction control system for space travel vehicle applications. Multiple functions are provided by one of these valve...
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6340138 |
Stationkeeping method utilizing open-loop thruster pulses and closed-loop authority limited momentum storage devices
A Stationkeeping Mode for a spacecraft having a gimballed momentum wheel for attitude control in which the stationkeeping is divided into short duration open-loop stationkeeping maneuvers to...
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6332592 |
Method for velocity precision pointing in spin-stabilized spacecraft or rockets
A method of velocity precision pointing of spin-stabilized spacecraft or rockets is disclosed. This method involves softening the ignition transient of the ramp up phase of thrust, which may be...
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6315239 |
Variable coupling arrangement for an integrated missile steering system
An integrated system for missile steering, which uses both jet reaction control (JRC) and aerofin control systems, is provided with a variable coupling mechanism for adjusting the relative...
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6311477 |
Reduced toxicity fuel satellite propulsion system including axial thruster and ACS thruster combination
A reduced toxicity fuel satellite propulsion system including a reduced toxicity propellant supply (10) for consumption in an axial class thruster (14) and an ACS class thruster (16). The system...
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6296207 |
Combined stationkeeping and momentum management
There is provided a method and system for simultaneous north-south stationkeeping and 3-axis momentum management for a geosynchronous orbiting spacecraft. The spacecraft has a first thruster, a...
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6260805 |
Method of controlling attitude of a momentum biased spacecraft during long-duration thruster firings
A method is provided for controlling the attitude of a momentum biased spacecraft about all three mutually orthogonal axes during a thruster firing maneuver without separately sensing angular...
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6208915 |
Method for low-fuel, computer-assisted control of any number of thrusters arranged on a spacecraft
A method for the on the whole minimum-fuel, computer-assisted control of an optionally determined number of thrusters, arranged as desired on a spacecraft, is to be specified, which method solves...
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6205378 |
Adaptive mass expulsion attitude control system
An attitude control system and method operative with a thruster controls the attitude of a vehicle carrying the thruster, wherein the thruster has a valve enabling the formation of pulses of...
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6173565 |
Three axis pulsed plasma thruster with angled cathode and anode strip lines
A spacecraft attitude and altitude control system utilizes sets of three pulsed plasma thrusters connected to a single controller. The single controller controls the operation of each thruster in...
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6154691 |
Orienting a satellite with controlled momentum gyros
Controlled momentum gyros are rotated to change the attitude of a satellite as rapidly as possible by rotating them along a great circle path on an imaginary spherical surface around the satellite....
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6142422 |
Method to reorient a spacecraft using only initial single axis attitude knowledge
A method for inertially aligning a spacecraft along an axis, comprising the steps of using quaternion feedback control to reorient the spacecraft, and during the step of reorienting, using rate...
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6138945 |
Neural network controller for a pulsed rocket motor tactical missile system
A neural network controller for a pulsed rocket motor tactical missile. The missile includes a fuselage or body, with a propulsion system. The pulsed propulsion system has a need for a logical...
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6135394 |
Practical method and apparatus for satellite stationkeeping
A practical stationkeeping method and apparatus wherein an electric propulsion system on a satellite is used to correct north-south drift and the majority of east-west drift which is caused by...
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6135393 |
Spacecraft attitude and velocity control thruster system
A rocket propulsion system for spacecraft achieves greater economy, reliability and efficiency rocket by incorporating monopropellant RCS thrusters (1a-1f) for attitude control and bipropellant...
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6131858 |
Compact single-propellant unitary propulsion system for a small satellite
A compact single-propellant unitary propulsion system for placing a satellite into an orbit and subsequently correcting the orbit so that the satellite is stabilized on three axes comprises a...
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6128556 |
CMG control based on angular momentum to control satellite attitude
Control moment gyros in an array are rotated to reorient a satellite. Gyro angle is selected from one of three values based upon whether the stored angular momentum for the desired angle is below a...
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6113035 |
Attitude control by modulating the rate of propellant depletion
A spacecraft according to the invention includes a pair of propellant tanks, with the nominal center of mass of the spacecraft located therebetween. Propellant is coupled from the tanks to a...
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6108593 |
Method and apparatus for estimating attitude sensor bias in a satellite
A method and apparatus for estimating attitude sensor bias in a satellite system uses attitude sensors and a spacecraft control processor. Attitude sensors provide output signals, which may contain...
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6102337 |
Spacecraft attitude control with gimbaled thrusters
A spacecraft control system having a spacecraft with a gimbaled thruster attached thereto. An actuator is operationally attached to the gimbaled thruster to control the angled position of the...
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6053455 |
Spacecraft attitude control system using low thrust thrusters
A spacecraft, such as a geosynchronous weather or communications satellite, is constructed to include a plurality of low thrust thrusters mounted at predetermined locations on at least one of a...
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6052630 |
Thruster optimized pair selection
A method for controlling the direction of a spacecraft of the type having a controller for calculating thrust forces comprises a plurality of thrusters disposed on said spacecraft in a spaced...
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6047927 |
Escaping singularities in a satellite attitude control
Control moment gyros in an array are rotated to reorient a satellite by an attitude signal. If the signal causes a gyro to have position that will produce a singularity in attitude control, a...
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6042058 |
Stationkeeping and momentum-dumping thruster systems and methods
Spacecraft stationkeeping and momentum-dumping methods are facilitated by the use of selected diagonal pairs of thrusters which are positioned adjacent to nadir or antinadir spacecraft faces. The...
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6036143 |
Solar array-mounted stationkeeping and maneuvering thrusters
A spacecraft includes a thruster coupled to an outward-facing portion of each solar array such that the thruster plume faces outward from the spacecraft. With the thruster located outboard of any...
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