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| Number | Title | Issue Date |
| 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 period between steps being equal to one-half of the period of ... | 06/27/1989 |
| 4837739 | Telemetry data processor A telemetry data processor for processing extremely high bandwidth data such as that associated with telemetry from spacecraft. A demultiplexer (1) distributes the data onto several channels (CHl through CHn), each comprising a (preferably split-cycle syn... | 06/06/1989 |
| 4833898 | Multi-detector dewar Consolidation of active and passive detectors (26, 28, 34) on a single coldfinger (20) in a dewar (10) is made possible by interposing between the detectors (26, 28, 34) an electromagnetic interference shield (64, 68) which acts as a waveguide filter bloc... | 05/30/1989 |
| 4829301 | Digital first order hold circuit There is provided a digitally controlled first order hold circuit and waveform synthesizer for digitally controlling the representation of a function over an approximation interval. In accordance with the operation of the invention, the first order hold c... | 05/09/1989 |
| 4828022 | Heat conducting sleeve The disclosed invention is a device and method for optimizing the weight and/or the heat transfer (conduction) capability of a heat transfer cylindrical sleeve. The sleeve is designed to fit around a cylindrical heat source. One particular application for... | 05/09/1989 |
| 4829459 | Programmable voltage offset circuit A programmable voltage offset circuit (PVOC) (1) comprises a temporary latch memory (7); a latch disable circuit (5) which selects that PVOC (1) among several such circuits which may be simultaneously present on the same semiconductor chip; a resistor arr... | 05/09/1989 |
| 4814719 | Unsymmetrical QPSK demodulator The present invention is a demodulator for demodulating an unsymmetrical QPSK signal (1), i.e., one in which the amplitudes of the I and Q channels are different, and the I and Q channels have been modulated by signals having differnt bit rates. Analog ve... | 03/21/1989 |
| 4810888 | Electrostatic shield for cryostat dewar Coolant gas pumped into the inner flask (3) of a cryostat dewar (2) causes an unwanted electrostatic charge on the inner surface (34) of the inner flask (3). This electrostatic charge can put an unwanted noise into the electrical output from an electromag... | 03/07/1989 |
| 4809203 | Hybrid analog-digital filter A filter which uses both an analog portion and a digital portion to optimize the filter performance. A simple analog filter provides a rough filtering of the input signal. The output of the analog filter is converted into digital form and supplied to a di... | 02/28/1989 |
| 4807529 | Hot gas control system A hot gas control system includes a pressure vessel defining a chamber in which is disposed a body of solid propellant material that has a leading portion and a trailing portion. A first layer of the body of solid propellant material extends between the l... | 02/28/1989 |
| 4806292 | System for stabilizing dimensional properties of cured composite structures Method and apparatus are disclosed for inducing dimensional stability in cured composite structures using acoustic emission analysis to identify the appropriate level and extent of coincident thermal conditioning. Temperature of the composite structure is... | 02/21/1989 |
| 4780691 | Dielectric resonator frequency discriminator for stabilizing oscillator frequency A frequency discriminator (1) stabilizes a voltage controlled oscillator (5), particularly one operating at microwave frequencies. A single dielectric resonator (2), typically positioned within a housing (8), is excited by an r.f. input (30). The dielectr... | 10/25/1988 |
| 4767084 | Autonomous stationkeeping for three-axis stabilized spacecraft Apparatus for autonomously performing stationkeeping maneuvers for three-axis stabilized spacecraft (1) such as geosynchronous satellites. For each of one or more spacecraft axes (y, z) the invention autonomously performs desaturation of a momentum/reacti... | 08/30/1988 |
| 4762989 | Image detection with image plane divider Apparatus for improving the resolution and/or field of view of an optical system without degrading the signal-to-noise ratio. An optical image of the object (1) in an image plane (8) is divided into n subimages, where n is any positive integer. Each of th... | 08/09/1988 |
| 4753354 | Self-adjusting rack adapter An adapter which comprises a pre-manufactured assembly capable of infinite vertical adjustment and self-adjusting width capability. To this end, the adapter of the present invention comprises a two-part unit in which the two parts thereof are relatively s... | 06/28/1988 |
| 4749244 | Frequency independent beam waveguide A frequency independent beam waveguide comprises a row of equispaced identical axisymmetric phase setting means (1), which may be lenses or reflectors, or a combination of both, spaced a distance D apart from each other. The focal length of each phase set... | 06/07/1988 |
| 4746976 | Star sightings by satellite for image navigation Stars are sensed by one or more instruments (1, 2) on board a three-axis stabilized satellite, for purposes of assisting in image navigation. A star acquistion computer (64), which may be located on the earth, commands the instrument mirror (33, 32) to sl... | 05/24/1988 |
| 4743310 | HGCDTE epitaxially grown on crystalline support A layer of HgCdTe (15) is epitaxially grown on a crystalline support (10). A single crystal CdTe substrate (5) is first epitaxially grown to a thickness of between 1 micron and 5 microns onto the support (10). Then a HgTe source (3) is spaced from the CdT... | 05/10/1988 |
| 4743278 | Passive propellant management system A passive propellant management system for a spacecraft liquid propellant tank (1) comprises several preferably V-shaped channels (2) which communicate liquid propellant from regions within the tank (1) to an outlet port (8), which expels liquid propellan... | 05/10/1988 |
| 4726242 | Method and apparatus for pre-loading a threadless linear actuator A threadless linear actuator apparatus comprising a sealed actuator unit with a sealed housing for a set of spool-shaped roller bearings. The roller bearing set includes at least one variable pitch loading roller and two fixed pitch rollers arranged in a ... | 02/23/1988 |
| 4725024 | Method for spinning up a three-axis controlled spacecraft A three-axis controlled spacecraft (1), typically a satellite, is spun up about its roll axis (20) prior to firing a motor (2), i.e., a perigee kick motor, to achieve the requisite degree of angular momentum stiffness. Thrusters (21) for imparting rotatio... | 02/16/1988 |
| 4710733 | r.f. Phase modulator An r.f. phase modulator operable at up to extremely high frequencies. A circulator (1) having input, output, and isolated ports (2, 3, 4, respectively), channels an r.f. carrier (15) in a prescribed direction. Fitting into an open end of the output port (... | 12/01/1987 |
| 4706047 | Frequency extended digitally generated FM A circuit for extending the frequency range of a digitally generated FM signal (f). A digital frequency generator (1) generates a precise FM waveform at a frequency up to about 50 MHz. Coupled to the FM signal (f) is a phase lock loop (53, 55, 57) compris... | 11/10/1987 |
| 4703179 | Sensor for hemispherical applications a ratating sensor responsive to infrared or electro-optic radiation has a nearly hemispherical field of view. The sensor comprises a rotating platform (3) supporting a planar multidetector focal plane array (1). The array (1) has three or four sides. Two ... | 10/27/1987 |
| 4698751 | Systolic array for solving cyclic loop dependent algorithms A systolic array (1) for reducing the time required to solve an algorithm having cyclic loop dependency, i.e., nested loops in which values calculated by inner loops depend upon indices of said inner loops and upon indices of outer loops. The array (1) co... | 10/06/1987 |
| 4695722 | Optical scanner error compensator An optical projection system, e.g., an imaging infrared system, is compensated for errors caused by scan-to-scan jitter, framing jitter, vibrational effects, and scan nonlinearities. One or two closed control loops compensate for errors associated with mi... | 09/22/1987 |
| 4692808 | Passively modulated push broom display Apparatus for producing a projected real-time visible display (9). A light source (2) and associated collimator (3,4) produces a collimated light beam (18) which is modulated by a linear array (6) of electronically controlled optical elements (16) with in... | 09/08/1987 |
| 4692723 | Narrow bandpass dielectric resonator filter with mode suppression pins An extremely narrow-band bandpass electromagnetic filter comprises a waveguide (1) dimensioned below cutoff and having two or more active sections (30) each containing a dielectric resonator (6). The number of resonators (6) corresponds to the number of p... | 09/08/1987 |
| 4691293 | High frequency, wide range FIR filter The operating speed and dynamic input range of a digital FIR filter are markedly improved by encoding the signal by powers of two and using the thus encoded signal to shift (rather than multiply) the coefficient at each tap of the filter. A multiplexed sh... | 09/01/1987 |
| 4688259 | Reconfigurable multiplexer A dynamically reconfigurable multiplexer (7) has applicability in a space diversity communications system or a polarization reuse communications system. Multiplexer (7) may be situated on board a communications satellite or at the control nexus of a terre... | 08/18/1987 |
| 4688092 | Satellite camera image navigation Pixels within a satellite camera (1, 2) image are precisely located in terms of latitude and longitude on a celestial body, such as the earth, being imaged. A computer (60) on the earth generates models (40, 50) of the satellite's orbit and attitude, resp... | 08/18/1987 |
| 4687161 | Pointing compensation system for spacecraft instruments A closed loop system reduces pointing errors in one or more spacecraft instruments. Associated with each instrument is a electronics package (3) for commanding motion in that instrument and a pointing control system (5) for imparting motion in that instru... | 08/18/1987 |
| 4688091 | Spacecraft camera image registration A system for achieving spacecraft camera (1, 2) image registration comprises a portion external to the spacecraft and an image motion compensation system (IMCS) portion onboard the spacecraft. Within the IMCS, a computer (38) calculates an image registrat... | 08/18/1987 |
| 4682235 | Ortho-linear imaging device A two-dimensional image (1) is converted into an electronic signal (7). Image line segments (11) into which the image (1) has been divided are selectively projected onto a cylindrical image lens (4) and focused onto a linear array (5) of N photodetectors ... | 07/21/1987 |
| 4675558 | Lock detector for bit synchronizer A lock detector (12) used in conjunction with a bit synchronizer (14) for determining when a random binary input signal (2) is in lock with a clock (7) generated by the bit synchronizer (14). A window comparator (3, 5; or 23, 25, 27) determines whether th... | 06/23/1987 |
| 4668955 | Plural reflector antenna with relatively moveable reflectors A method and apparatus are provided for transmitting a microwave signal as a beam having a wavelength small as compared to the size of the reflecting surfaces, wherein a main reflector is stationary with respect to a sub-reflector and the main reflector i... | 05/26/1987 |
| 4662722 | Polarization insensitive mirror A polarization insensitive mirror (3) comprises a single homogeneous coating (1) coated onto a typically metallic reflective surface (2). The mirror (3) is substantially insensitive to polarization of incident radiation (4) over a wide range of angles of ... | 05/05/1987 |
| 4655848 | HgCdTe epitaxially grown on crystalline support A layer of HgCdTe (15) epitaxially grown onto a crystalline support (10), e.g., of sapphire of GaAs. A CdTe substrate (5) is epitaxially grown to a thickness of between 1 micron and 5 microns on the support (10). A HgTe source (3) is spaced from the CdTe ... | 04/07/1987 |
| 4654671 | Self-aligning torque transmitting hinge A hinge (5) having a first, relatively stationary yoke (8) and a second, relatively rotating yoke (10). A torquing means (17) fixed with respect to the first yoke (8) transmits torque to the second yoke (10) via a block (18) retained within a cavity (20) ... | 03/31/1987 |
| 4653075 | BPSK synchronizer using computational analysis A bit synchronizer for a BPSK input signal having a sinusoidal carrier frequency f that is much greater than the modulating signal bit rate. The synchronizer comprises means (29, 31) for repetitively sampling the amplitude of the input signal over a prese... | 03/24/1987 |
