Patents Examined by Malcolm F. Hubler
  • Patent number: 4309641
    Abstract: A line scanning or horizontal deflection circuit for a television receiver including a first scanning thyristor controlled by means of a commutating circuit comprising a second thyristor an inductance and a capacitive circuit, fed from a source which is connected to the scanning circuit by means of a further inductance. According to the invention, the gating signal of the first thyristor is derived from the signal available between the inductance and the capacitive network being taken at an output of the line.
    Type: Grant
    Filed: December 27, 1979
    Date of Patent: January 5, 1982
    Assignee: Thomson-Brandt
    Inventor: John Shepherd
  • Patent number: 4308538
    Abstract: A receiver in a radar system has two feed horns which supply a hybrid. The ybrid sums the amplitude of the signals from the feed horns at its first output and subtracts the signals at its second output. The outputs are each converted to I.F. by mixers, de-chirped, and then are coherently integrated. The integrated output of the difference is fed to a servo for tracking. The integrated output of the sum is fed through a control unit to control the beat signal of the mixers.
    Type: Grant
    Filed: March 22, 1966
    Date of Patent: December 29, 1981
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Walter J. Albersheim
  • Patent number: 4308535
    Abstract: In a moving-target indicator in which the pulse-repetition period of an associated Doppler radar is subject to variation, incoming echo pulses appearing in the output of an i-f stage of the radar receiver are demodulated with the aid of two coherent reference signals in relative quadrature and the results are digitized for transmission over two parallel channels. In each channel, digitized signals corresponding to two consecutive echoes in a given range cell are subtracted from each other to provide a pair of difference signals which are passed through a weighting device for multiplication by factors which are trigonometric functions of a selected Doppler frequency and of the difference between the actual repetition period and a theoretical constant value of that period. The weighted signals are subjected to further filtering before being utilized for further processing or display.
    Type: Grant
    Filed: October 19, 1979
    Date of Patent: December 29, 1981
    Assignee: Thomson-CSF
    Inventors: Jean-Claude Guillerot, Michel Delauney
  • Patent number: 4308537
    Abstract: The present invention discloses an automatic range containment system for e in an electric/optical or electromagnetic active "radar" type sensor to discriminate against background obstructions within a sensor field of view. The system comprises an intrusion timer initiated by a signal received from a target sensor; a containment interval timer initiated by a turn-on pulse; a transmitter oscillator in combination with a clock generating pulses; a range containment timer initiated by the pulses; a range set-back timer in combination with a range gate and a gate; a range counter for counting and totalling a signal passed through the gate; and a digital-to-analog converter converting the signal from the range counter to the range containment timer providing a range control causing the system to reduce operational range if the background obstructions appear within the sensor's field of view.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: December 29, 1981
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Clyde R. Berry, Richard A. Dye
  • Patent number: 4307665
    Abstract: This disclosure relates to countermeasure systems, particularly to systems for providing a protective cover against homing and/or fire control devices operating upon infrared, sonar, or microwave reflected energy or for confusing search and tracking devices, and more particularly to decoy rounds and their method of fabrication. The decoy rounds include at least one load of energy generating material, means for propelling the load, a burst charge for shattering the load, the burst charge being constructed so as to cause a line type explosion, and means for igniting the burst charge.
    Type: Grant
    Filed: June 15, 1967
    Date of Patent: December 29, 1981
    Assignee: General Dynamics Corporation
    Inventors: Kenneth A. Block, William M. Carter, George H. Schillreff
  • Patent number: 4307399
    Abstract: An apparatus for providing increased homing capabilities in a guided miss seeker against a continuous wave radar signal by compressing the received signal which effectively increases the received signal level by more than twenty decibels.
    Type: Grant
    Filed: April 3, 1967
    Date of Patent: December 22, 1981
    Assignee: The United State of America as represented by the Secretary of the Navy
    Inventors: Phillip A. Love, Gabriel S. Borunda
  • Patent number: 4307400
    Abstract: A method and apparatus for "masking" an aircraft or other vehicle so as to revent it from being located by an enemy radar. The vehicle is provided with means for generating and radiating a CW signal which is gated off during the reception of a radar pulse, such that a narrow gap or slot is produced in the CW signal. The reflected radar pulse in effect "falls into" this slot and hence is indistinguishable from the remainder of the CW signal as seen by the operator of the enemy radar.
    Type: Grant
    Filed: September 29, 1968
    Date of Patent: December 22, 1981
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Frank P. Miley
  • Patent number: 4306235
    Abstract: A microwave antenna for use at a limited number of non-harmonically related frequencies, particularly two, includes a pair of reflectors, a detector diode, and a modulator diode mounted on a waveguide in operative spatial relationships which are compromises of closely occurring multiples of half or quarter wavelengths of the frequencies of interest. More particularly, the reflectors are spaced apart such a compromise distance which results in a low voltage standing wave ratio. The antenna includes a coaxial detector diode holder or sidearm positioned on the waveguide and in communication therewith at a position to provide sharp tuning at one of the frequencies while the detector diode is positioned in a coaxial diode holder at a location operative to sharply tune the other frequency. The modulator diode is positioned in the waveguide a distance from the detector diode holder which is a compromise distance based on in-guide half wavelengths at each of the frequencies.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: December 15, 1981
    Assignee: CBC Corporation
    Inventor: Richard M. Christmann
  • Patent number: 4305075
    Abstract: An antenna system of the Cassegrain type, used with a tracking radar and adapted to conically scan incoming waves reflected by outlying targets, comprises a paraboloidal main reflector and two hyperboloidal auxiliary reflectors confronting same. One of the auxiliary reflectors is semitransparent and coaxial as well as cofocal with the main reflector whereas the other is solid with an axis inclined to that of the main reflector about which it rotates while keeping its foci in the focal planes of the semitransparent reflector.
    Type: Grant
    Filed: December 15, 1978
    Date of Patent: December 8, 1981
    Assignee: Thomson-CSF
    Inventors: Francois Salvat, Jean Bouko
  • Patent number: 4305022
    Abstract: A horizontal scanning rate correction apparatus for a cathode-ray tube, particularly of the beam index color cathode-ray tube type, includes a memory for storing correction values representing deviations of the horizontal scanning rate of the electron beam from a desired scanning rate at each of a plurality of horizontal sampling positions along each of a plurality of predetermined horizontal sampling lines which are substantially fewer in number than the horizontal lines along which scanning occurs. During display of a video signal, a selected one of the stored correction values is read out of the memory for each scanning position of the beam along a scanned one of the horizontal lines, with each read correction value, and a corresponding sampling line correction signal produced therefrom, representing the deviation at a corresponding horizontal sampling position on one of the sampling lines.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: December 8, 1981
    Assignee: Sony Corporation
    Inventors: Ichiro Mitamura, Katsuo Isono
  • Patent number: 4302708
    Abstract: An efficient cathode ray deflection amplifier is provided having a selectable scan rate capability, providing sweep rate linearity through the use of a feed back arrangement that also cooperates in a self-adaptive manner with respect to commanding changes in the raster scan rate or display size.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: November 24, 1981
    Assignee: Sperry Corporation
    Inventor: Thomas W. Spilsbury
  • Patent number: 4301393
    Abstract: An automatic Y-axis offset system for a cathode ray tube, which performs automatic positioning of a trace to a predetermined position on the cathode ray tube face such that the trace becomes visible, by applying a Y-axis offset voltage to the input signal voltage. The automatic positioning is performed when commanded by an operator through switch actuation. The offset voltage is produced by a feedback circuit which includes an amplifier receiving the input signal, a comparator for comparing an output voltage from the amplifier with a predetermined level, a counter which is enabled to count a clock signal so long as the level of output signal from the amplifier is different from the predetermined level, and a digital-to-analog converter which converts the count in the counter to an analog signal constituting the Y-axis offset voltage.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: November 17, 1981
    Assignee: Anritsu Electric Company Limited
    Inventors: Koji Shoji, Yoshinobu Hamamoto
  • Patent number: 4301453
    Abstract: In the radar device, the received signal is down-converted with three different signals prior to speed evaluation, so that three signals having different amplitudes are available for speed evaluation. Only the signal having the greatest amplitude is then evaluated, and this amplitude is always sufficiently great.
    Type: Grant
    Filed: December 31, 1979
    Date of Patent: November 17, 1981
    Assignee: International Standard Electric Corporation
    Inventors: Gunter Neininger, Bernard Hahn
  • Patent number: 4298830
    Abstract: A horizontal deflection generator includes the series arrangement of a horizontal deflection winding and a trace capacitor, a retrace capacitor, and a horizontal trace switch. The trace switch comprises a damper diode and a horizontal output transistor. Base drive for the horizonal output transistor is provided by a horizontal driver stage through a driver transformer. A secondary winding of a flyback transformer is coupled to a high impedance cascade rectifier arrangement to form a DC supply which provides collector supply voltage for the driver stage. The DC supply has a relatively large source impedance to changes in the load current being drawn from the supply by the driver stage. Such a large impedance is desirable in order to limit the base driver to the horizontal output transistor during picture tube arc-over and to allow for duty cycle tolerances in the horizontal oscillator output.
    Type: Grant
    Filed: November 30, 1979
    Date of Patent: November 3, 1981
    Assignee: RCA Corporation
    Inventor: Peter R. Knight
  • Patent number: 4298829
    Abstract: A deflection generator periodically applies a trace voltage to a deflection winding to produce scanning current and periodically generates a retrace pulse voltage across the deflection winding. A supply voltage source develops the trace voltage and also provides energy to circuits, such as a high voltage circuit, coupled to windings of a flyback transformer. The high voltage circuit develops an ultor accelerating potential from the retrace pulse voltage developed across the high voltage winding of the flyback transformer. A controllable switch such as an SCR is coupled to the source and to a secondary winding of the flyback transformer. The trace voltage and energy transfer is regulated by controlling the conduction time of the SCR. The high voltage and other load circuits draw load current from the source through the flyback transformer secondary winding during retrace, resulting in high voltage retrace pulse duration and amplitude variation with variations in load current.
    Type: Grant
    Filed: February 8, 1980
    Date of Patent: November 3, 1981
    Assignee: RCA Corporation
    Inventor: David W. Luz
  • Patent number: 4297700
    Abstract: Measurement of distance is carried out by transmitting a VHF wave train crising a sinusoidal signal modulated by phase inversion in accordance with a pseudo-random sequence, at a receiver shifting a like second sequence until it coincides with the received sequence, re-transmitting a signal modulated by the second sequence, receiving the second sequence and shifting a like third sequence until it coincides with the received second sequence, and measuring the phase shift between the third sequence and a like reference sequence.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: October 27, 1981
    Assignee: Societe d'Etudes, Recherches et Constructions Electroniques Sercel
    Inventors: Georges Nard, Jean Rabian, Michel Rouaud
  • Patent number: 4297702
    Abstract: A radar fuzing system for a guided missile is shown to include means for impressing a polyphase coded modulation on a transmitted signal and delayed replicas of such modulation on a bank of correlator/mixers, each one of the latter including dual gate field effect transistors as the active elements.
    Type: Grant
    Filed: May 24, 1978
    Date of Patent: October 27, 1981
    Assignee: Raytheon Company
    Inventor: Irven S. Carnes
  • Patent number: 4296414
    Abstract: A P-I-N type diode high frequency switch in a secondary radar interrogation device working with ISLS and RSLS and consisting of a transmitter, two receivers and two antennas. So as to reduce the high cost for P-I-N type diodes, including driver stages for the transmission and reception separation and to eliminate the necessity of an antenna switching unit, the terminals 19 and 20 of a pair of antennas are directly connected through single lines 23 and 24 to band pass filters 5 and 6 connected to respective receivers 7 and 8 with the band pass filters 5 and 6 blocking the transmission signal and allowing reception of received signals and wherein the electrical lengths of the line and the band pass filter is such that the input impedance corresponding to no-load operation occurs at the corresponding antenna terminal for the transmission frequency.
    Type: Grant
    Filed: November 29, 1979
    Date of Patent: October 20, 1981
    Assignee: Siemens Aktiengesellschaft
    Inventors: Franz Beyer, Siegfried Sedlmair
  • Patent number: 4293803
    Abstract: A resonant retrace vertical deflection circuit comprises a retrace capacitor which forms a resonant circuit with the yoke vertical deflection windings during retrace of the electron beams. One or more diodes isolate the yoke from the circuit power supply to allow the yoke voltage to increase beyond the level of the supply to provide faster retrace. A second power supply is provided to precharge the retrace capacitor prior to retrace, resulting in a further decrease in retrace time.
    Type: Grant
    Filed: February 4, 1980
    Date of Patent: October 6, 1981
    Assignee: RCA Corporation
    Inventor: William V. Fitzgerald
  • Patent number: 4293802
    Abstract: An electromagnetic deflection yoke for a cathode ray tube (CRT) stroke display system is operated above its resonant frequency to allow faster writing speeds and the use of a single pair of XY deflection yokes for both position and write deflection. Operation above resonant frequency is accomplished by the inclusion of a second-order feedback network tuned to the frequency characteristics of the deflection yoke and associated shunt capacitance. Differing from prior art systems, the current applied as a feedback signal to an input of the yoke driver amplifier in a closed loop system is directly proportional to actual, instantaneous inductive component of the yoke current and to this component only.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: October 6, 1981
    Assignee: International Business Machines Corporation
    Inventor: Trung Le