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| Number | Title | Issue Date |
| 5311183 | Windshear radar system with upper and lower elevation radar scans The present invention is an airborne radar system which scans the flight path of an aircraft with two radar scans, an upper elevation pointing above local level and a lower elevation scan pointing below the glide slope. The radar returns from the upper el... | 05/10/1994 |
| 5309160 | Radar system and method having variable tracking range A segmented stretch waveform for wide band high duty cycle tracking application. The waveform is divided into multiples of two spaced segments as the tracking range closes. Target returns received during spaced segments are combined to correspond to the c... | 05/03/1994 |
| 5274241 | Optical and electromagnetic field A vanadium oxide compound having the formula VO2 is disclosed for the purpose of selectively shielding an electromagnetic transmitter or receiver. Vanadium oxide exhibits a marked and rapid transition from dielectric and transparent to electrom... | 12/28/1993 |
| 5250871 | Low vibration sensitivity crystal resonator arrangement An arrangement of crystal resonators that provides significantly reduced net resonator vibration sensitivity by arranging the crystallographic axes of some of the resonators to have antiparallel relationship, without regard to the acceleration sensitivity... | 10/05/1993 |
| 5244869 | Superconducting microwave frequency selective filter system A superconducting microwave selective filter system having a superconducting filter connected to receive RF signals and perform filtering before the RF signals are applied to nonlinear circuitry such as receiver protectors and low noise amplifiers. A sing... | 09/14/1993 |
| 5214438 | Millimeter wave and infrared sensor in a common receiving aperture The present invention is an integrated millimeter wave (MMW) and an infrared (IR) common aperture sensor employing a common primary reflector for infrared and millimeter wave energy. An active transmitter/receiver millimeter wave horn assembly located at ... | 05/25/1993 |
| 5198822 | Method and apparatus for determining the angle of arrival of a radar signal at a spinning interferometer Method and apparatus for quickly determining the angle of arrival of a signal at a spinning interferometer based on the phase rate of changes and the cone angles between respective pulses received at the spinning interferometer.... | 03/30/1993 |
| 5196854 | Inflight weather and ground mapping radar The present invention is a radar system that corrects for changes in apparent reflectivity and two-way precipitation attenuation using a correction curve that includes a segment for low rain rates, a segment for high rain rates and, if desired, a transiti... | 03/23/1993 |
| 5194875 | Notch radiator elements A radiator has a planar dielectric substrate which supports a stripline conductor therein. A conductive housing receives and encloses the dielectric and isolates the stripline from adjacent structures. The housing has a radiator with a high impedance term... | 03/16/1993 |
| 5189429 | Method and apparatus for ambiguity resolution in rotating interferometer A precision azimuth angle and &#b1; elevation angle of an emitter are determined by measuring the frequency and differential phase .psi.j of a received signal at each of a number of interferometer rotational positions. Each measured differentia... | 02/23/1993 |
| 5185527 | Multispectral superconductive quantum detector A multispectral superconductive quantum radiant energy detector and related method utilizing a closed loop of superconductive material having spaced legs, one of which is disposed to ambient. The superconductivity current is divided in the first and secon... | 02/09/1993 |
| 5182563 | Enhanced performance mode S interrogator An enhanced performance Mode S interrogator that includes a matched channel receiver. The receiver includes equiripple-phase response filters with finite peaks of attenuation. This new class of filters provides a faster rise of attenuation than all-pole f... | 01/26/1993 |
| 5181036 | False return signal apparatus An optical acoustic charge transport (ACT) device provides a variable and continuous delay for RF signals. Received RF signals are converted to light and focused onto an optical ACT device. The continous delay is utilized to generate a false radar return.... | 01/19/1993 |
| 5179072 | Multispectral superconductive quantum detector A multispectural superconductive quantum radiant energy detector and related method utilizing a closed loop of superconductive material having spaced legs, one of which is disposed to ambient. The superconductivity current is divided in the first and seco... | 01/12/1993 |
| 5177487 | Sea velocity evaluator Sea clutter can be removed from radar signals by accurately determining sea velocity in a coverage area of a radar scan, updating a median value for the coverage area, and selecting a clutter rejection filter for the coverage area biased on the median val... | 01/05/1993 |
| 5175397 | Integrated circuit chip package A hermetically sealed package for one or more integrated circuit chips that is made of three metal, thick-film layers, and one dielectric, thick-film layer to form a mounting surface for the chip. The first applied metal layer includes the power plane, an... | 12/29/1992 |
| 5166629 | Direct frequency synthesizer A direct frequency synthesizer is provided with a single stage or multiple cascaded stages. Each stage includes a fixed frequency input channel and a selectable frequency input channel which are coupled respectively to the I and L ports of a mixer. The in... | 11/24/1992 |
| 5155492 | Dual mode active aperture A dual mode active aperture phased array system for pulsed radar and continuous wave applications. The system may be switched between the two modes without appreciable loss of average effective radiated power. Both the voltage and current of the biasing p... | 10/13/1992 |
| 5155542 | Doublet pulse phase conjugate atmospheric energy transfer system A coherent energy transfer system is disclosed which utilizes a doublet pulse laser transmitter in combination with a phase conjugate mirror (PCM) assembly. In one embodiment of the present invention, the first pulse of the doublet pulse signal illuminate... | 10/13/1992 |
| 5146299 | Ferroelectric thin film material, method of deposition, and devices using same A ferroelectric device that comprises a polarizing thin film of BaMF4 deposited on a substrate. Ba is barium, M is one of the metals of the group consisting of iron (FE), manganese (Mn), cobolt (Co), nickel (Ni), magnesium (Mg), and zinc (Zn). ... | 09/08/1992 |
| 5140338 | Frequency selective radome A freqency selective surface for passing electromagnetic wave energy and the selected frequency band is described. The device includes a conductive apertured substrate having apertures formed therein which are sized and arranged in a predetermined patern.... | 08/18/1992 |
| 5136300 | Modular solid state radar transmitter A solid state radar transmitter for use in airborne applications has a modular design which extends into the transmitter. The transmitter is formed of a plurality of power modules the number of which is selected based on the power required for a particula... | 08/04/1992 |
| 5134685 | Neural node, a netowrk and a chaotic annealing optimization method for the network The present invention is a node for a network that combines a Hopfield and Tank type neuron, having a sigmoid type transfer function, with a nonmonotonic neuron, having a transfer function such as a parabolic transfer function, to produce a neural node wi... | 07/28/1992 |
| 5132690 | Low power polystatic radar method and system Polystatic radar system and method for operating at relatively low power for a given coverage. The illumination power density of the transmit pattern is continuously varied as a function of the range to the receiver from each point within the receive beam... | 07/21/1992 |
| 5128506 | Method and apparatus for selective infrared soldering using shielding fixtures An apparatus and method is disclosed for making additional solder joints on a printed wiring assembly which includes a printed wiring board and components soldered previously thereto. Additional components, along with additional solder to be reflowed to f... | 07/07/1992 |
| 5128684 | Method and apparatus for correlating sensor detections in space and time Sensor detections received over time are analyzed to find relationships therebetween. For example, radar echoes, outputs from an infrared sensor, etc., may be analyzed to find target tracks. First, gross similarities are detected by mapping, e.g., angular... | 07/07/1992 |
| 5111084 | Low loss drain pulser circuit for solid state microwave power amplifiers A drain pulsing circuit for intermittently applying electric power to the drain of a solid state amplifier uses a N-channel MOSFET as the drain switch, but does not require an external bias voltage to drive the drain switch gate. The pulsing circuit gener... | 05/05/1992 |
| 5111038 | Acousto-optic tunable filter apparatus and method for detecting and identifying an optical radiation source. A source of broad-band and/or narrow band optical radiation is detected and identified by apparatus including a pair of acousto-optical tunable filters which diffract from orthogonally polarized components of the optical radiation, a diffracted ordinary p... | 05/05/1992 |
| 5111382 | High power, high frequency resonant inverter using MOS controlled thyristors A high power, high frequency inverter has series/parallel resonant inverter elements and employs MOS controlled thyristors (MCTs) in the switching circuit. The resonant inverter elements include a split inductor for reducing peak voltage across the switch... | 05/05/1992 |
| 5103103 | Microwave shield A switchable shield which precludes transmission or receipt of radio frequency or microwave energy. The shield comprises a substrate of highly transmissive material with an active film layer disposed on the substrate. This active film layer is switchable ... | 04/07/1992 |
| 5084687 | Surface acoustic wave encoder/decoder A unitary surface acoustic wave device for continuous quadraphase coding of a high amplitude video impulse with provisions for controlling the rise and fall times of such impulse.... | 01/28/1992 |
| 5081590 | Computer aided technique for post production tuning of microwave modules A method and apparatus which incorporates an optimization gradient algorithm for post production tuning of a microstrip microwave amplifier. The tuning technique replaces conventional time consuming manual post production tuning techniques and comprises a... | 01/14/1992 |
| 5079557 | Phased array antenna architecture and related method A phased array antenna having a first plurality of phase shifters each connected to a solid state transmit module power amplifier. Equal split power combiners, each having a pair of inputs and a pair of outputs, are connected to the power amplifiers and t... | 01/07/1992 |
| 5077239 | Chalcogenide glass, associated method and apparatus A crystal of a composition of silver, thallium, and sulfur is useful in non-linear optical devices, acousto-optical devices, piezo electric devices and other types of optical and acoustic devices. The chalcogenide glass composition of the invention displa... | 12/31/1991 |
| 5077677 | Probabilistic inference gate The present system performs linear transformations on input probabilities and produces outputs which indicate the likelihood of one or more events. The transformation performed is a product of linear transforms such as Po =[Aj P... | 12/31/1991 |
| 5074673 | Laser-based target discriminator A laser-based target discriminator system for discriminating desired objects from other objects and clutter in an image scene is disclosed. The system is operative to scan a pulsed laser beam a plurality of times across an image area, the scans covering d... | 12/24/1991 |
| 5075646 | Compensated mixed dielectric overlay coupler A loaded overlay coupler with capacitive stubs slows down the even mode velocity more than odd mode velocity. The quarter wavelength of the coupler cancels impedance caused by the stubs so that directivity is enhanced and impedance mismatch is minimized.... | 12/24/1991 |
| 5073761 | Non-contacting radio frequency coupler connector A radio frequency coupler connector includes a housing having first and second housing portions. The first housing portion includes a first open-ended launcher operatively connected to a first connection terminal, and the second housing portion includes a... | 12/17/1991 |
| 5066956 | Azimuth-stacked radar method and apparatus An azimuth-stacked radar method and apparatus of the type typically used for surveillance employs a mechanically-rotating antenna comprising horizontal end-fed rows of antenna radiating elements with phase shifter control on each row together with a monop... | 11/19/1991 |
| 5066925 | Multi push-pull MMIC power amplifier In a particular embodiment, the invention is directed to a composite MMIC amplifier comprising a plurality of active devices (e.g., FET, HBT, HEMT) arranged on a semiconductor substrate and having inputs and outputs. A pair of input and output transmissio... | 11/19/1991 |
