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| Number | Title | Issue Date |
| 5394075 | Spacecraft bus regulation using solar panel position A spacecraft power bus regulation method and apparatus for a spacecraft. The spacecraft has solar arrays (10) and a battery (30) coupled to the spacecraft power bus (32) to drive electrical loads (34). A bus voltage limiter (38) controls the flow of curre... | 02/28/1995 |
| 5383359 | Determining liquid fill fraction on a spacecraft A method and apparatus of determining the fill fraction of a liquid in a spacecraft in weightless space is disclosed. A small motion is introduced about the center of mass of the spacecraft undergoing steady spin and/or thrust, and resulting spacecraft os... | 01/24/1995 |
| 5384575 | Bandpass frequency selective surface An improved bandpass frequency selective surface is disclosed which provides a wide pass band and reflection band with low loss at varying angles of incidence, low cost, low volume and light weight. The improved bandpass frequency selective surface of the... | 01/24/1995 |
| 5374911 | Tandem cavity thermal compensation A plural cavity structure (10), suitable for use as a microwave filter (34, 34A, 34B) , has plural cavities (24, 26, 28, 30) disposed within a cylindrical aluminum housing (12) and having a central planar transverse wall (18) including an iris (38) for co... | 12/20/1994 |
| 5363075 | Multiple layer microwave integrated circuit module connector assembly A connector assembly for interconnecting microwave integrated circuit modules where each module has at least one microwave interconnection pin and one DC power pin. A groundplane (28) supports the mounting surfaces (32) of the modules (10) and has a plura... | 11/08/1994 |
| 5347243 | Non-contacting waveguide "T" switch A non-contacting waveguide "T" switch (10) is provided including a stator (12), a rotor (14) mounted for rotation relative to the stator, and a coaxial conductor (64) located at the axis of the rotor for carrying a coaxial transmission. The stator (12) ha... | 09/13/1994 |
| 5343493 | Personal assistance system and method for use with a cellular communication system A personal assistance system and method for use with a cellular communication system operating over a cellular communication band and having a plurality of cell-sites. A transceiver transmits to the cell-sites a spread spectrum burst of pulses including a... | 08/30/1994 |
| 5343471 | Address filter for a transparent bridge interconnecting local area networks An address filter for a transparent bridge interconnecting two local area networks (LANs) is disclosed. The address filter is capable of determining from an address contained in a frame issued on one network if it should be transferred to a second network... | 08/30/1994 |
| 5337981 | Method and apparatus for compensating for solar torque transients on a satellite during a solar eclipse This invention discloses a method for determining when an orbiting satellite (10) is eclipsed from the sun in order to remove control torques to the satellite (10) which compensate for the disturbance of solar pressure on the satellite (10). A current mea... | 08/16/1994 |
| 5327150 | Phased array antenna for efficient radiation of microwave and thermal energy An active phased array is provided that includes a plurality of subarrays (20) having an upper RF radiating panel assembly (22) including a plurality of radiating waveguides (26) and a feed waveguide (24) all formed of aluminum. RF radiating slots (28) ar... | 07/05/1994 |
| 5310144 | Method and apparatus for satellite torque balancing A method and apparatus for balancing environmental disturbance torques acting upon a satellite (10) by tilting the satellite solar panels (14,16) toward or away from the sun to change the solar pressure acting upon the satellite (10) as well as the gravit... | 05/10/1994 |
| 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 the capture maneuver is performed in a way to preserve space... | 05/03/1994 |
| 5305001 | Horn radiator assembly with stepped septum polarizer A circularly polarized wave entering the horn is converted to a linearly polarized wave which appears in one of the ports depending on the sense of the polarization. The stepped configuration of the impedance matching section minimizes mutual coupling amo... | 04/19/1994 |
| 5285176 | Flat cavity RF power divider A flat cavity RF power divider wherein a flat cavity and an input waveguide share a common wall, coupling slots being disposed in the common wall offset from the centerline of the input waveguide for exciting a dominant TE4,0 mode in the flat c... | 02/08/1994 |
| 5285509 | Coupler for waveguides of differing cross section A waveguide coupler for coupling electromagnetic power between a first rectangular waveguide and a second rectangular waveguide includes a one-dimensional intermediate waveguide formed of two plates spaced apart by a distance equal to a common height of t... | 02/08/1994 |
| 5284309 | Propellant immobilizing system and method A propellant immobilizing system and method in which propellant motion in the propellant storage tanks (22) is reduced or eliminated during velocity change maneuvers to reduce disturbance torques acting upon the spacecraft (10) and improving the spacecraf... | 02/08/1994 |
| 5285174 | Temperature-compensated waveguide isolator A temperature-compensated junction isolator (28) is used with a waveguide junction (20) in a hollow microwave waveguide system (22). The junction isolator (28) includes a ferrite cylinder (34) within the waveguide walls (30 and 32) at the junction with it... | 02/08/1994 |
| 5283796 | Phase plate or spiral phase wheel driven linear frequency chirped laser Frequency modulated radar transmitters with a repetitive linear increase in frequency with time, referred to as "frequency chirps", are required for many radar applications. The present invention provides a simple way of obtaining such a chirped frequency... | 02/01/1994 |
| 5283795 | Diffraction grating driven linear frequency chirped laser The present invention provides various embodiments of laser systems for generating "chirp" signals. In the broadest sense, a diffraction grating is placed within a laser cavity on the face of a carrier and the motion of the carrier in its own plane causes... | 02/01/1994 |
| 5262889 | Optical frequency shifter A method and apparatus for frequency shifting an optical beam where the frequency shifted beam remains both spatially and temporally coherent with no spread in frequency and can be continually tuned in frequency shift over a wide range without any change ... | 11/16/1993 |
| 5257759 | Method and apparatus for controlling a solar wing of a satellite using a sun sensor This invention discloses a method for maintaining a desirable orientation of the solar wings of an orbiting satellite (10) relative to the sun. A dual array of sun sensors (26,28) is positioned on a body (12) of the satellite (10) in order to get a measur... | 11/02/1993 |
| 5257140 | Mirror for infrared and visible wavelength radiation High reflectance mirror 40 for multiple wavelengths has substrate 42 which carries first reflector stack 46 for reflection of the principal, longer wavelength and a stack 66 which reflects shorter wavelength in an alignment beam. Semiconductor layer 64 se... | 10/26/1993 |
| 5248982 | Method and apparatus for calibrating phased array receiving antennas Disclosed is a method and apparatus for calibrating phased array receiving antennas that includes circuitry for generating a pair of calibration signals separable one from the other. The signals are injected into the delay elements of the antenna from opp... | 09/28/1993 |
| 5233358 | Antenna beam forming system An improved antenna beam forming system 10 for generating a set of directed beams wherein each beam may include carrier signals of more than one frequency is disclosed herein. The improved beam forming system of the present invention includes a first beam... | 08/03/1993 |
| 5224165 | High speed word generator An improved high speed word generator (30) which includes a white noise generator (12) for providing first and second bits and exclusive or (XOR) means (32) for providing an output signal which is the exclusive or of said first and second bits. In an alte... | 06/29/1993 |
| 5221990 | Wide field of view automotive rear vision optical system The present optical system (20) provides an all-reflective vehicle rear vision optical system. A planar mirror (22), acting like a conventional vehicle rearview mirror, would be positioned to receive a beam. The beam would be provided by an image erecting... | 06/22/1993 |
| 5216345 | Mixed mode stepper motor controller and method A mixed mode controller (100) for use with a motor having a mechanism (110, 114) for generating a command signal to operate the motor and a first circuit (104) for adjusting the gain of the command signal to provide high speed operation. A second circuit ... | 06/01/1993 |
| 5212747 | Zero loss waveguide coupler A waveguide coupler comprises a curved end reflector mirror that images a waveguide exit back into the waveguide with an essentially exact reproduction of the waveguide output intensity distribution. The coupler also comprises a lens disposed near the wav... | 05/18/1993 |
| 5204637 | Power detection technique for automatic amplifier power control A controlled-output power amplifier (50) is provided having a wide dynamic range in a plurality of output power levels. The controlled-output amplifier (50) includes an amplifier (12) for receiving an input signal (14) and for providing an output signal (... | 04/20/1993 |
| 5175802 | Macro image processing system An image processing system (10) includes an array (12) of detectors (14), each of which is designed to produce a current proportional to incident radiation. This system provides image processing at a viable sampling rate even for very large arrays and per... | 12/29/1992 |
| 5123744 | System and method for detection and identification of laser wavelengths Each of three or more telescopic filters in pairs of filters and detectors therefor has very narrow passband lines centered about laser wavelengths and nearby guardbands. As defined, a passband is any wavelength region of the spectrum permitted by a syste... | 06/23/1992 |
| 5093563 | Electronically phased detector arrays for optical imaging An optical imaging system includes an array of small aperture subtelescopes each with heterodyne detectors. The array detects the amplitude and phase of light waves emanating from a scene under observation before they are combined into an image. The beam ... | 03/03/1992 |
| 5084123 | Temperature stable optical bonding method and apparatus Optical elements (52, 54) are bonded to supports (58) by a resilient bonding agent (68) and a rigid bonding agent (78). The resilient bonding agent has the property of shrinking upon curing and is placed within a bonding space (66) defined by rails (64) o... | 01/28/1992 |
| 5080483 | All-reflective boresight transfer optical system The present optical system provides an all-reflective boresight transfer system. A reflective mechanism receives and reflects energy from an incoming collimated beam to focus it upon a target surface. The target surface absorbs and subsequently re-emits a... | 01/14/1992 |
| 5081689 | Apparatus and method for extracting edges and lines An apparatus and method for processing image data to derive edges and line segments. Image intensity data is processed in one dimension along a series of scan lines to produce an intensity curve (10). Pairs of points along a scan line curve (10) represent... | 01/14/1992 |
| 5077593 | Dark current-free multiquantum well superlattice infrared detector A multiquantum well superlattice photodetector for detecting long wavelength infrared radiation in which dark current is reduced by a blocking layer. The tunneling component of the dark current in a multiquantum well photodetector is substantially elimina... | 12/31/1991 |
| 5075549 | Pyroelectric detector using electronic chopping A pyroelectric detector using electronic chopping of the detector bias signal to reset the detector. The detector is preferably operated slightly above or below its Curie temperature. Multiplexing of a plurality of electronically-reset detectors is also d... | 12/24/1991 |
| 5075776 | Method of electronically stabilizing a video image having vibration-induced jitter A method of electronically stabilizing an image in the presence of jitter. The jitter induced error is measured prior to the beginning of each active sampling window signal and the error is computed into a corresponding number of pixel clock signal period... | 12/24/1991 |
| 5073683 | Edge repair and reinforcement of flexible flat cables A previously fabricated flat flexible cable (10) includes tears and/or micro-fissures, micro-cuts or other defects or imperfections, depicted by jagged or wavy lines (16), in its edges (18). A multi-fiber tread (20), placed at the cable's edges, is enclos... | 12/17/1991 |
| 5068750 | Contaminant removal from telescope optical elements Illumination, heating and/or damage to baffles (114) and other structures (112) of a telescope (110) during cleaning of its mirrors (116, 118) by a laser beam (128) is avoided by directing the= laser beam from a source (130) outside of the telescope throu... | 11/26/1991 |
