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| Number | Title | Issue Date |
| 5349312 | Voltage variable attenuator A voltage variable attenuator is described including a quadrature hybrid coupler having an input port, an output port, a first reflective port and a second reflective port. The voltage variable attenuator further includes a first and a second impedance ne... | 09/20/1994 |
| 5340980 | Frequency discriminator with fiber optic delay line A microwave oscillator is shown to include an oscillator having an output and a control port and a feedback circuit disposed between the output and the control port of the oscillator. The feedback circuit includes a modulated laser, having an input and an... | 08/23/1994 |
| 5327089 | Portable assembly for supporting magnetic and electrical sensors A portable underwater mount for magnetic and electric field sensors. The mount has a gimbal-like structure comprising a ball member having a mounting flange for coupling to the magnetometer. The ball member is cast from polyurethane with Teflon powder sus... | 07/05/1994 |
| 5327141 | Clutter removal by polynomial compensation Apparatus and method for removing unwanted components of a signal received from a radar transmitter. The unwanted components lie in a clutter Doppler frequency band. Such components are removed by first sampling the received signal at a rate sufficient to... | 07/05/1994 |
| 5323064 | Radio frequency signal frequency converter A switchable, dual channel frequency converter is provided. The converter includes a semiconductor body having formed as a monolithic microwave integrated circuit: a pair of input signal channels; a pair of output signal channels; and, a mixer and multipl... | 06/21/1994 |
| 5321667 | Sonar systems A sonar system is provided for mapping the bottom of a body of water to identify a submerged foreign object. A sequence of the sonar pulses is transmitted and directed toward the bottom. The mapping is formed from a sequence of echo returns. Each one of t... | 06/14/1994 |
| 5317293 | Waveguide switch circuit with improved switching and tuning capability An RF switch circuit includes a waveguide transmission line having an input port, an output port, a first wall having a first cavity disposed therein and a second wall having a second cavity disposed therein with the first and second cavities being aligne... | 05/31/1994 |
| 5315561 | Radar system and components therefore for transmitting an electromagnetic signal underwater A radar system is shown to include a transmitter for transmitting a pulsed electromagnetic signal having a frequency less than 500 Hz and a receiver for receiving a (scattered) reflected signal provided from the pulsed electromagnetic signal (scattered) r... | 05/24/1994 |
| 5314144 | Thermally compensating insert fastener A fastener assembly is shown including a cylindrical support structure with a bore provided partially therein, the bore having a wall surface with a slot, and a bushing, disposed within the bore of the cylindrical support structure, having an end and an o... | 05/24/1994 |
| 5308984 | Method of operating a dual mode tracking system A method of processing IR signals from a repetitively scanned array of photovoltaic cells is shown to consist of the steps of: (a) subtracting IR signals received on successive scans to produce response signals corresponding only to IR signals from moving... | 05/03/1994 |
| 5309408 | Sonar system A system for providing advance warning of underwater navigation hazards that threaten safe ship passage is provided. The system includes a sonar transmitter/receiver adapted for mounting on the ship in a forward looking direction. A processor, in response... | 05/03/1994 |
| 5291461 | Elastomer structure for transducers An elastomer support for a sonar transducer includes a ceramic stack electromechanical driver, a pair of rigid support members, and a pair of elastomer layers disposed between the ceramic stack electromechanical driver and the support members. The elastom... | 03/01/1994 |
| 5289549 | B-adaptive adpcm image data compressor An apparatus for processing a stream of digital data to provide a set of linear prediction coefficients and prediction error sequence representing said block of data which, when used to reconstruct the block of data, will reconstruct the data with a minim... | 02/22/1994 |
| 5281973 | Local oscillator frequency control means for semiactive missile guidance and control system A target tracking radar receiver for use in a semiactive tracking system wherein elevation angle data, azimuth angle data and Doppler frequency shift data are processed in a manner which enables narrow band filtering of target angle tracking data in the f... | 01/25/1994 |
| 5274343 | Plural switch circuits having RF propagation networks and RF terminations A radio frequency circuit includes a first RF switch having a first common port coupled to an input port of the switch circuit and a first pair of branch ports and a second RF switch having a second common port coupled to an output port of the circuit and... | 12/28/1993 |
| 5268879 | Electro-acostic transducers A flexural transducer includes a hollow tube that is magnetically driven by a coil/magnet assembly. A magnetic field is provided by passing a current through the coil. The filed passes through an air gap between the coil and the magnet to attract and repe... | 12/07/1993 |
| 5268691 | Local oscillator frequency control means for semiactive missile guidance and control system A target tracking radar receiver for use in a semiactive tracking system wherein elevation angle data, azimuth angle data and Doppler frequency shift data are processed in a manner which enables narrow band filtering of target angle tracking data in the f... | 12/07/1993 |
| 5268680 | Combined infrared-radar detection system A combined infrared-radar detection system wherein a radar antenna also serves as the primary mirror in an infrared focusing arrangement.... | 12/07/1993 |
| 5267223 | Electroacoustic transducer seal A compliant cover for use with acoustic source transducers includes a rubber boot bonded to a shell of the transducer. The cover has a groove molded within a surface thereof to allow the shell to expand and contract with reduced resistance. Conventional t... | 11/30/1993 |
| 5266951 | Analog to digital converter calibration system and method of operation A calibration circuit includes a plurality of signal sources each of said signal sources having an output port and providing a signal having a known phase and a signal combiner circuit having a plurality of input ports and an output port with each of said... | 11/30/1993 |
| 5254878 | Voltage regulated power supply providing a constant output voltage A voltage regulator is provided for producing a predetermined output voltage level. The voltage regulator has a voltage source for providing a plurality of successively increasing voltage levels at a corresponding plurality of output terminals, or taps. A... | 10/19/1993 |
| 5251185 | Sonar signal processor and display An improved sonar signal processor and display combining the use of both coherent and incoherent signal processors. In addition to a conventionally used matched filter detection processor, an incoherent signal processor comprising a cross-range energy fil... | 10/05/1993 |
| 5249871 | High force ball bearings A ball bearing assembly with a spacer to prevent ball bearing failures. The spacer has a ring with a tongue that fits into a groove in a second spacer ring. One spacer ring is coupled to the outer ring of the ball bearing assembly and the other spacer rin... | 10/05/1993 |
| 5245347 | All weather tactical strike system (AWTSS) and method of operation An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic countermeasures... | 09/14/1993 |
| 5233351 | Local oscillator arrangement for a monopulse receiver in a semiactive missile guidance system An improved local oscillator arrangement for a monopulse receiver in a semiactive missile guidance system is shown. The monopulse receiver includes an improved reference local oscillator wherein a first local oscillator signal and a pair of reference sign... | 08/03/1993 |
| 5231278 | Bar code wand reader adapter A bar code wand reader adapted to read a bar code disposed on a narrow surface such as an edge of a printed wiring board is shown to include a bar code wand reader adapter (32) affixed to an end of a bar code wand reader (34). The adapter includes a fore ... | 07/27/1993 |
| 5229978 | Electro-acoustic transducers A composite split cylinder transducer comprises an electromechanical driver and a cylindrical shell having a longitudinal gap. The shell further has a portion, disposed opposite the gap, comprised of a high strength material having increased stiffness. Tr... | 07/20/1993 |
| 5225838 | All weather tactical strike system (AWTSS) and method of operation An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic countermeasures... | 07/06/1993 |
| 5223842 | All weather tactical strike system (AWTSS) and method of operation An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic countermeasures... | 06/29/1993 |
| 5219132 | Two-axis gimbal arrangement A gyroscopically stabilized optical seeker for use in a cannon-launched projectile is shown to include a gimbal arrangement wherein a two-axis rate gyroscope and associated torque motors are utilized to attain the requisite stabilization however such seek... | 06/15/1993 |
| 5220538 | Electro-acoustic transducer insulation structure A bonded insulator flexural transducer for use in sonar applications includes a hollow metal tube having an inner surface, a segmented ceramic electromechanical driver disposed along an inner surface of the tube and a bonded insulator disposed between the... | 06/15/1993 |
| 5220535 | Sonar baffles A split cylinder compliant tube baffle for absorbing and/or canceling noise signals generated within a submarine or surface ship is described. The split cylinder tube baffle includes an air-filled tube having a longitudinal gap extending the length of the... | 06/15/1993 |
| 5220292 | Microwave oscillator with noise degeneration feedback circuit A microwave oscillator is shown to include an oscillator having an output and a control port and a feedback circuit disposed between the output and the control port of the oscillator. The feedback circuit includes a modulated laser, having an input and an... | 06/15/1993 |
| 5208563 | Radio frequency circuit An RF circuit includes an RF power divider circuit having an input port and a plurality of output ports the RF power divider circuit providing in response to a signal fed to the input port an output signal at each output port each output signal having kno... | 05/04/1993 |
| 5201895 | Optically beam steered infrared seeker A seeker is disclosed including a Cassegrainian telescope, responsive to an optical signal having a signal path, for directing the optical signal toward an optical detector. The seeker also includes a first rotatable optical wedge, disposed in the signal ... | 04/13/1993 |
| 5198786 | Waveguide transition circuit A transition circuit includes a conductive pin; a first dielectric member disposed about a first portion of the conductive pin; and a second dielectric member disposed about a second, different portion of the conductive pin and having a first surface disp... | 03/30/1993 |
| 5187459 | Compact coupled line filter circuit A filter circuit includes a first pair of RF propagation networks disposed to provide a first coupled line section having a first electrical pathlength at a first frequency, means for providing a signal path between an input port of the filter and the fir... | 02/16/1993 |
| 5185608 | All weather tactical strike system (AWISS) and method of operation An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic countermeasures... | 02/09/1993 |
| 5184137 | All weather tactical strike system (AWTSS) and method of operation An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic counter-measure... | 02/02/1993 |
| 5184136 | Pulse radar and components therefor A pulse radar for operation at 94 GHz and higher frequencies is shown to include an antenna, a diplexer and first detector that are each optically fed so that radio frequency signals may be, when transmitting, passed through the diplexer to the antenna an... | 02/02/1993 |
