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| Number | Title | Issue Date |
| 5119042 | Solid state power amplifier with dynamically adjusted operating point RF power is sampled and measured at the input and output of a solid state power amplifier using directional couplers and matched square law detectors. Outputs from the detectors are applied to differential inputs of a DC operational amplifier. Outputs fro... | 06/02/1992 |
| 5080307 | Spacecraft earth-pointing attitude acquisition method A method for acquiring Earth-pointing attitude of a three-axis, body-stabilized spacecraft orbiting the Earth in a prescribed orbit plane, e.g. a geosynchronous communications satellite, including the steps of aligning the roll axis of the spacecraft with... | 01/14/1992 |
| 5072226 | Radiometer system incorporating a cylindrical parabolic reflector and minimum redundancy array feed A radiometer system is disclosed, the system incorporating a cylindrical parabolic reflector and a plurality of radiation sensors disposed along the focal line of the reflector in a minimum redundancy array. Digital processing circuitry is connected to th... | 12/10/1991 |
| 5067673 | Essentially passive method for inverting the orientation of a dual spin spacecraft An essentially passive and "fuel-less" method for inverting the orientation of a preferably nutationally stable, dual spin spacecraft disposed in an inclined orbit, includes the steps of increasing the rotational speed of (i.e., "spinning up") the spacecr... | 11/26/1991 |
| 5061037 | Dual septum polarization rotator A dual septum polarization rotator which, in the presently preferred embodiment thereof, includes a square waveguide and a pair of stepped septums disposed in spaced, orthogonal relation to each other within opposite end portions of the square waveguide. ... | 10/29/1991 |
| 5055798 | Hybrid matrix amplifier systems, and methods for making thermally-balanced hybrid matrix amplifier systems A hybrid matrix amplifier system that yields balanced thermal loads with minimal input signal constraints includes an input multiport hybrid coupler system having outputs joined to a plurality of amplifiers, and an output multiport hybrid coupler system j... | 10/08/1991 |
| 5053294 | Planar sodium-sulfur electrical storage cell A sodium-sulfur electrical storage cell (10) has a planar solid electrolyte (16) that is permeable to sodium ions, a planar permeable porous cathode (24) filled with sulfur, a planar permeable porous anode (28) filled with sodium, and an electrically nonc... | 10/01/1991 |
| 5052640 | Spacecraft design enabling the flat packing of multiple spacecraft in the launch vehicle A spacecraft (100) such as a satellite, is shaped roughly in the form of a disk with a uniform height (104) such that a plurality of such spacecraft may be stowed for launch in a stack (204), thereby enabling a greater number of satellites to be launched ... | 10/01/1991 |
| 5048086 | Encryption system based on chaos theory An encryption system and method based on the mathematics of Chaos theory, which provides protection of data from unauthorized modification and use during its storage and transmission. At its core are nonlinear equations which exhibits random, noise-like p... | 09/10/1991 |
| 5047738 | Ridged waveguide hybrid A waveguide hybrid includes a generally rectangular superstructure defined by first and second conductive broad walls and first and second conductive narrow walls, and an intermediate, conductive narrow wall bifurcating the superstructure into first and s... | 09/10/1991 |
| 5038152 | Broad band omnidirectional monocone antenna A broad band omnidirectional monocone antenna 10 having a wide operative frequency spectrum and a large elevation angle A is disclosed herein. The antenna 10 of the present invention includes an input circular waveguide network 12 and 18 for providing ele... | 08/06/1991 |
| 5038150 | Feed network for a dual circular and dual linear polarization antenna A feed network for an antenna system, e.g., a phased array antenna system, which is operatively associated with a signal source, e.g., satellite-based transponders, which generates first and second R.F. signals of circular polarization, and third and four... | 08/06/1991 |
| 5038341 | Relay communication system The invention is a relay communications system which uses a single reference frequency signal generator to produce a plurality of precisely frequency synchronized code division multiple access radio frequency signals. A transmitter transmits the synchroni... | 08/06/1991 |
| 5034711 | Dielectric resonator support system for a waveguide A system for supporting a dielectric resonator in a circular waveguide. A dielectric resonator is held in its optimum position using support posts or rods. The support rods are made from a suitable dielectric material, and slip fitted in holes provided at... | 07/23/1991 |
| 5025119 | One-time-close relay useful in spacecraft power systems A relay (30) has one or both current carrying relay contacts (12, 14) made of a soft, deformable, readily fusible metal, preferably indium, lead, cadmium, bismuth, or tin. When the relay (30) closes, the contacts (12, 14) deform or fuse together, ensuring... | 06/18/1991 |
| 5019793 | Digitally implemented variable phase shifter and amplitude weighting device A variable phase shifter and amplitude weighting (VPSAW) device capable of selectively varying the phase and amplitude of an incoming RF signal (RFIN) in such a manner as to produce an output RF signal (RFOUT) having a selected phase... | 05/28/1991 |
| 5012992 | Spin stabilization via momentum wheels or similar devices A spacecraft incorporating momentum sources such as spinning momentum wheels having momentum vectors or components thereof oriented along the desired axis of rotation of the spacecraft. The rotation axis of the spacecraft is nominally any one of the three... | 05/07/1991 |
| 5010351 | Slot radiator assembly with vane tuning An array antenna (20) that avoids the generation of grating lobes or second order beams is formed of a two-dimensional array of radiating elements (40) disposed in parallel rows (22) and parallel columns (24), each of the radiating elements being formed a... | 04/23/1991 |
| 5006859 | Patch antenna with polarization uniformity control A patch antenna is formed of one or more flat disc-shaped radiators disposed parallel to and spaced apart from a common ground-plane element. At each radiator, there is a feed assembly of two feeds positioned to one side of a center of the radiator in spa... | 04/09/1991 |
| 5001493 | Multiband gridded focal plane array antenna A multiband gridded focal plane array antenna 10 is disclosed which provides simultaneous beams of multiple frequencies. The antenna 10 includes a metallization pattern 11 providing a first set of conductive edges 18 having a first length L1 an... | 03/19/1991 |
| 5001492 | Plural layer co-planar waveguide coupling system for feeding a patch radiator array An antenna system for an array antenna includes an array of radiators formed as patch antenna elements on a dielectric substrate, there being a shielding metallic sheet on a side of the substrate opposite the radiators. A further dielectric substrate and ... | 03/19/1991 |
| 4999262 | Multilayer cathode current collector/container for a battery A cathode current collector/container for use in an electrochemical battery cell, e.g., a Na/S battery cell, which includes an advantageously porous graphite first layer and a molybdenum second layer securely bonded to the graphite first layer, preferably... | 03/12/1991 |
| 4994809 | Polystatic correlating radar The polystatic correlating radar includes a plurality of radar receivers which receive a signal reflected from an object from one or more radar signal transmitters. Signals received from the plurality of receivers are cross correlated to provide high reso... | 02/19/1991 |
| 4995055 | Time shared very small aperture satellite terminals A time shared power amplifier for amplifying first and second modulated carrier signals for transmission. The carrier signals are modulated by first and second data signals, respectively. The first and second signals are characterized by bursts of data se... | 02/19/1991 |
| 4987775 | Propellant measurement system A propellant measurement system 10 capable of accurate propellant measurement within a low gravity environment is disclosed herein. The propellant measurement system 10 of the present invention includes a pressurization tank 20 of a first volume Vp | 01/29/1991 |
| 4980693 | Focal plane array antenna A microstrip focal plane array antenna is disclosed which includes a planar dielectric board 18 having a first surface 22 and second surface 28. A second radiating element 30 is located on the second surface 28 of the dielectric board 18 and a first radia... | 12/25/1990 |
| 4972199 | Low cross-polarization radiator of circularly polarized radiation An antenna is constructed of an array of contiguous circular cylindrical radiators each of which extends forwardly of a radiator assembly producing two circularly polarized waves of opposite direction of rotation of their respective electric fields. The r... | 11/20/1990 |
| 4968957 | Transmit and receive diplexer for circular polarization A diplexer for processing polarized energy at separate transmit and receive frequencies. The nature of the polarization may be circular, linear or elliptical depending upon the phasing associated therewith. The diplexer comprises a waveguide having first ... | 11/06/1990 |
| 4967174 | Rotating coaxial switch The rotating coaxial switch first lifts the switching circuitry, including portions of the ground plane, rotates it to a new position, and then lowers the switching circuitry in the new position to make new connections. Rotation is by a stepper motor. Lif... | 10/30/1990 |
| 4965605 | Lightweight, low profile phased array antenna with electromagnetically coupled integrated subarrays A lightweight, low profile phased array antenna 10 is disclosed which includes an electromagnetically coupled integrated subarray in a multilayer structure with no vertical electrical connections and no phase shifters. The integrated subarray includes a f... | 10/23/1990 |
| 4956643 | Transponder with selective antenna beam using shared antenna feed elements A transponder that selectively provides both global and spot beam antenna coverage. The transponder comprises a channel amplifier and an antenna feed network that includes coupler means for coupling energy into a plurality of power distribution networks t... | 09/11/1990 |
