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| Number | Title | Issue Date |
| 6380601 | Multilayer semiconductor structure with phosphide-passivated germanium substrate A multilayer semiconductor structure includes a germanium substrate having a first surface. The germanium substrate has two regions, a bulk p-type germanium region, and a phosphorus-doped n-type germanium region adjacent to the first surface. A layer of a... | 04/30/2002 |
| 6336318 | Ion thruster having a hollow cathode assembly with an encapsulated heater, and its fabrication An ion thruster has a hollow cathode assembly including a heater with an inner ceramic sleeve and an outer ceramic sleeve. The outer ceramic sleeve overlies the inner ceramic sleeve with a filament volume between the two sleeves. A wound filament has wind... | 01/08/2002 |
| 6329587 | Semiconductor power generator based on a source of heavy ions and alpha particles A power generator includes a current-generating cell having a layer of a fission source of heavy ions and alpha particles, and two semiconductor structures, one on each side of the layer of the fission source. The layer of the fission source is preferably... | 12/11/2001 |
| 6318069 | Ion thruster having grids made of oriented pyrolytic graphite An ion thruster includes a source of a plasma of ions and electrons, and an ion-optics system located in sufficient proximity to the source of the plasma to extract ions therefrom. The ion-optics system has at least two domed grids arranged in a facing-bu... | 11/20/2001 |
| 6317548 | Temperature and optical length control of optical fibers and optical waveguide devices An optical fiber has a concentration of dopant ions residing within its core region. The dopant ions absorb optical energy at an excitation wavelength, converting that optical energy to heat and/or a change in the index of refraction and optical length of... | 11/13/2001 |
| 6304822 | Spacecraft attitude control systems with dynamic methods and structures for processing star tracker signals Methods are provided for dynamically processing successively-generated star tracker data frames and associated valid flags to generate processed star tracker signals that have reduced noise and a probability greater than a selected probability Pslctd... | 10/16/2001 |
| 6293502 | System and method for enhanced solar array pointing in sun-nadir steering A satellite (30) programmed for sun-nadir steering and having a solar wing (36) mounted to the satellite body (35) and being selectively moveable about two mutually orthogonal axes (A, B). The solar wing (36) is mounted to the satellite body (35) by a pai... | 09/25/2001 |
| 6288671 | Beacon-assisted spacecraft attitude control systems and methods Control systems and methods are provided which enhance acquisition range, transient response and offset pointing accuracy in beacon-assisted orientation of a spacecraft to a desired spacecraft attitude Adsrd. The methods receive a beacon signal... | 09/11/2001 |
| 6288670 | Combined roll-yaw spacecraft steering method for low earth orbit target trajectory compensation For an antenna on a satellite in an inclined orbit about the Earth, cross-track motion resulting from the rotation of the Earth can be reduced in antenna coordinates by yawing and/or rolling the antenna (preferably by yawing and/or rolling the entire sate... | 09/11/2001 |
| 6285395 | Earth sensor for satellite An earth sensor for a communication satellite is provided which utilizes a camera for viewing the earth from the satellite and an optical correlator which optically processes the video data from the camera to provide attitude information to a satellite at... | 09/04/2001 |
| 6283415 | Simplified yaw steering method for satellite antenna beam control For an antenna on a satellite in an inclined orbit about the Earth, cross-track motion resulting from the rotation of the Earth can be reduced in antenna coordinates by yawing the antenna (preferably by yawing the entire satellite, for example, by using a... | 09/04/2001 |
| 6275005 | Low-voltage-drop bypass of failed battery cell A battery system includes an electrical storage cell having a positive terminal and a negative terminal. The electrical storage cell is provided with a normally open bypass circuit path that is closed in the event of an open-circuit failure of the electri... | 08/14/2001 |
| 6272679 | Dynamic interference optimization method for satellites transmitting multiple beams with common frequencies A dynamic method for optimizing interference levels between multiple downlink beams transmitted from a satellite with a common frequency spectrum causes the power level of at least one of the interfering beams to be adjusted so as to produce desired inter... | 08/07/2001 |
| 6272432 | System and method for correcting star tracker low spatial frequency error in stellar-inertial attitude determination systems A system and method of estimating the attitude of a spacecraft compares a three-axis inertial-based estimate of spacecraft attitude to a stellar-based estimate of the spacecraft attitude. A Kalman filter having some states associated with low spatial freq... | 08/07/2001 |
| 6270616 | Metal-filled, plateable structural adhesives for cyanate ester composites A family of adhesives is provided for bonding cyanate ester composite articles together which is also plateable with metal once chemically etched. The adhesives comprise a polymeric matrix and a filler of metal powder or metal flakes. The polymeric matrix... | 08/07/2001 |
| 6269630 | Rocket engine with internal chamber step structure A rocket engine includes a generally cylindrical annular combustion chamber, an injector attached to an injector end of the combustion chamber, a generally cylindrical annular step collar fitting within the combustion chamber at the injector end thereof, ... | 08/07/2001 |
| 6266024 | Rotatable and scannable reconfigurable shaped reflector with a movable feed system An antenna system having a rotatable and scannable reconfigurable shaped reflector with a movable feed system. The antenna system allows beam shapes to be rotated about an optimum axis and defocused while a spacecraft is in orbit in order to change a part... | 07/24/2001 |
| 6264373 | Optical transition device An optical transition device provides a connection between two fiber structures. The device comprises a first transition body having a first transition body bore therethrough, a first fiber connector connected to the first transition body and having a fir... | 07/24/2001 |
| 6261680 | Electronic assembly with charge-dissipating transparent conformal coating A coated electronic assembly comprises an electronic assembly, and a single-layer conformal coating overlying at least a portion of the electronic assembly. The conformal coating has a volume electrical resistivity of from about 108 to about 10... | 07/17/2001 |
| 6260806 | Method and apparatus for using a momentum bias to provide spacecraft attitude stabilization during an eclipse The attitude of a spacecraft is controlled during an eclipse without the dependence on auxiliary power by configuring the spacecraft so that it will receive solar power after solar eclipse is passed. The spacecraft is then oriented with respect to a sun l... | 07/17/2001 |
| 6259899 | System and method for analysis of intermodulation dispersion A system and method for determining dispersion of intermodulation power in a satellite communication system or any other system which can be mathematically modeled as a matrix multiplication followed by an instantaneous nonlinearity and another matrix mul... | 07/10/2001 |
| 6257067 | Vertical direction spacecraft vibration test system with pseudo-free boundary conditions A method, apparatus, for subjecting a test object to vibrational energy testing is disclosed. The apparatus comprises a rotatable joint such as a hydrostatic ball joint for transmitting energy from a force generator to the test object, and a support struc... | 07/10/2001 |
| 6254036 | Method and apparatus for spacecraft wheel desaturation A method and apparatus are provided that effect spacecraft wheel desaturation by controlling the magnetic torquers aboard the spacecraft. An attitude control system energizes a magnetic torquer coil or set of magnetic torquer coils using a power source ha... | 07/03/2001 |
| 6252691 | Intrasatellite wireless communication A wireless intrasatellite communication system is disclosed. Satellite telemetry signals are multiplexed, converted into a digital data stream, and processed by an ASIC to form a multiplexed telemetry data stream. An infrared transceiver transmits the mul... | 06/26/2001 |
| 6252473 | Polyhedral-shaped redundant coaxial switch A three dimensional microwave switch having a plurality of waveguide transmission lines configured in an octahedral shape having microwave I/O ports at the corners. Individual actuators selectively move respective reeds within the waveguide transmission l... | 06/26/2001 |
| 6250070 | Ion thruster with ion-extraction grids having compound contour shapes An ion thruster has a source of a plasma, and an ion-optics system located in sufficient proximity to the source of the plasma to extract ions therefrom. The ion-optics system includes at least two grids arranged in a facing-but-spaced-apart relationship ... | 06/26/2001 |
| 6249967 | Fabrication of a rocket engine with a transition structure between the combustion chamber and the injector A rocket engine is fabricated by a multistep brazing and welding technique. An annular step collar is fns brazed to a trnnsition joint. This first subassembly is second brazed to the combustion chamber. This second subassembly is third brezed to an annula... | 06/26/2001 |
| 6243243 | Solar array with ESD protection A solar array having protection from electrostatic discharge (ESD) has a load coupled to the array. The load has a ground terminal that is also coupled to the solar array. A high impedance device is coupled between the array and ground terminal to prevent... | 06/05/2001 |
| 6236939 | Method and apparatus for controlling spacecraft attitude with rotational star trackers High precision spacecraft attitude determination is produced by specially positioning the spacecraft's star trackers and then filtering out measurement errors produced from star tracker electronics. In addition to the conventional azimuth and elevation co... | 05/22/2001 |
| 6232624 | InPSb channel HEMT on InP for RF application A high electron mobility transistor (HEMT) includes a substrate comprising indium phosphide and an optional buffer layer immediately adjacent the substrate. A channel layer immediately is adjacent the buffer layer, with the channel layer comprising indium... | 05/15/2001 |
| 6229725 | Full bridge converter current sense approach using virtual current summing and cancellation The present invention discloses a method and system for sensing currents in a power converter. The system having two current sensing transformers each having two primary windings, a main transformer, and a plurality of switching elements. Each current sen... | 05/08/2001 |
| 6229482 | Method and apparatus for interference mitigation for phased-array beam pointing A method and apparatus for determining interference from a beam generated by a satellite includes the steps of determining a desired beam having a desired center location, a desired shape, a beam angle, and a predetermined frequency bandwidth comprising a... | 05/08/2001 |
| 6229282 | Low-voltage-drop, spring-activated bypass of failed battery cell A battery system includes an electrical storage cell having a positive terminal and a negative terminal. The electrical storage cell is provided with a normally open bypass circuit path that is closed in the event of an open-circuit failure of the electri... | 05/08/2001 |
| 6229262 | Electronic power conditioner anode voltage control An anode control circuit for at least two traveling wave tubes powered by a common electronic power conditioner. The anode control circuit has separate anode drive circuits for the traveling wave tubes that are referenced to a voltage that is higher than ... | 05/08/2001 |
| 6229189 | Multi-function optoelectronic device structure An optoelectronic device has an epitaxial layer structure that has a substrate and a first layer formed adjacent to the substrate. The first layer may, for example, form a contact layer. A second layer is formed adjacent to the first layer. The second lay... | 05/08/2001 |
| 6228673 | Method of fabricating a surface coupled InGaAs photodetector A photodetector is fabricated in a multilayer structure having a semi-insulating InP substrate, an n+ InP contact layer overlying the InP substrate, an undoped InGaAs absorbing layer overlying the n+ InP contact layer, and a p+ doped InGaAs layer overlyin... | 05/08/2001 |
| 6228536 | Lithium-ion battery cell having an oxidized/reduced negative current collector A lithium-ion battery cell assembly includes a negative electrode having a negative current collector contacting a negative electrode active material. The negative current collector is prepared by providing a piece of a negative current collector metal, t... | 05/08/2001 |
| 6225964 | Dual gridded reflector antenna system An antenna system comprising a first reflector and a second reflector is disclosed. The first reflector reflects an incident signal from a signal source. The incident signal comprises a first signal having a first polarization and a second signal having a... | 05/01/2001 |
| 6225875 | Dual sidewall coupled orthomode transducer having septum offset from the transducer axis A waveguide for guiding an arbitrarily polarized electrical field includes an elongated housing having a sidewall and a pair of feed ports located on the housing sidewall. One of the feed ports guides the horizontal component of the electrical field, whil... | 05/01/2001 |
| 6225640 | Method for electrical shunt detection and removal on semiconductors An improved method of detecting and removing a shunt from a photoelectric semiconductor device comprises the steps of characterizing the device by generated data or performance graph; forward biasing the device; producing electromagnetic radiation from th... | 05/01/2001 |
