Patents Examined by Malcolm F. Hubler
  • Patent number: 4347511
    Abstract: In the disclosed apparatus, a reference image sensor continuously scans a lmed atlas of images representing terrain being overflown while a second sensor simultaneously scans the terrain. A correlator compares the signal and the reference image sensor describes a course, corresponding to that of the flying body, over the film, in response to control signals based upon the correlation results. The reference image sensor reads only the area of the film around the course.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: August 31, 1982
    Assignee: Messerschmitt-Bolkow-Blohm Gesellschaft mit beschrankter Haftung
    Inventors: Otto Hofmann, Walter Kroy, Peter Nave
  • Patent number: 4347512
    Abstract: A communications system is described which utilizes an antenna having means for selectively controlling the amount of incident electromagnetic energy directionally reflected therefrom. The antenna is comprised of a spherically configured array of conductors which focus incident energy on a reflector whose electrical conductivity characteristics and thus reflectivity characteristics can be controllably varied. The reflector can comprise a gas tube whose conductivity and thus reflectivity characteristics are a function of the number of ionized gas molecules therein. Modulation of the reflector reflectivity characteristics permits identification information, for example, to be impressed on the energy reflected therefrom.
    Type: Grant
    Filed: April 18, 1968
    Date of Patent: August 31, 1982
    Assignee: Allied Corporation
    Inventor: Edmund F. Sweeney
  • Patent number: 4347513
    Abstract: A netted, search radar system to defeat monopulse anti-radiation missiles utilizing a plurality of search radars scanning asynchronously with differently coded signals. The coded pulse trains from each radar precisely timed and frequency locked to one another in order that all radar units simultaneously emit pulses on or at substantially the same r.f. carrier frequency.
    Type: Grant
    Filed: September 9, 1980
    Date of Patent: August 31, 1982
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: John K. Schindler
  • Patent number: 4346333
    Abstract: A digital oscilloscope is provided with a position control circuit which permits positioning of a signal both before and after digitizing. A track and hold circuit is coupled to the position control potentiometer to generate a reference voltage which tracks the position voltage in a waveform acquisition mode, and which is held at a fixed level in a display mode while the position voltage, which is applied to the acquisition preamp, is variable adjustable. A summation circuit subtracts the reference voltage from the position voltage to provide an altered positioning voltage for the display amplifier which is zero in the acquisition mode and variable in the display mode.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: August 24, 1982
    Assignee: Tektronix, Inc.
    Inventor: Thomas P. Dagostino
  • Patent number: 4345252
    Abstract: To improve the accuracy of angular measurements in a radar or sonar system by suppressing noise due to target glint, an angular-deviation signal .epsilon. derived from the output signals .SIGMA. and .DELTA. of a sum channel and a difference channel is multiplied with a gain-control signal K(t) before being subjected to recursive filtering. Signal K(t) is obtained, also by recursive filtering, from a weighting function P(t) which goes to zero during periods when the measurement of the angular deviation is unreliable as determined from a low value of sum signal .SIGMA. and from a peaking of a quadrature deviation signal .epsilon.q, function P(t) being proportional to the product .SIGMA..sup.n .multidot.(S-.vertline..epsilon.q.vertline.) where the exponent n is at least equal to 1 and S is a predetermined threshold. The recursive filter processing the deviation signal .epsilon. has two cross-connected stages, both controlled by signal K(t), respectively emitting a corrected deviation measurement .epsilon.
    Type: Grant
    Filed: February 7, 1980
    Date of Patent: August 17, 1982
    Assignee: Thomson-CSF
    Inventors: Roland Carre, Georges Doriath
  • Patent number: 4344021
    Abstract: The minimum output level of an electron gun driven at discrete voltage levels is precisely established. A target value slightly above the minimum voltage level is compared with the actual value. The result of the comparison is used to uniformily establish the minimum electron gun drive voltage and thus compensates for electron gun transfer characteristic differences and variations within the gun drive circuitry. An additional circuit utilizing a target value slightly below the maximum voltage can be used to establish the maximum output level of the electron gun.
    Type: Grant
    Filed: July 21, 1980
    Date of Patent: August 10, 1982
    Assignee: RCA Corporation
    Inventor: Loren B. Johnston
  • Patent number: 4342032
    Abstract: A device for the detection of and defense against low-flying helicopters which are masked or hidden by ground cover has a heat-sensitive sensor and an optical filter to detect heat radiation which is modulated at a frequency corresponding to the frequency of rotation of the helicopter blades. The helicopter motor and drive train provide a heat source, and the detector is positioned above the helicopter so that heat radiation reaching the detector from the helicopter is modulated by the rotating blades so that the detector can distinguish the helicopter heat source from other ground heat sources. The detector can be positioned by deployment from a tank and suspended above an area by a parachute, or may be contained in a remote piloted vehicle. The detector may relay a position signal to ground artillery for combat of the helicopter, or may be equipped with an explosive device which may be deployed after detection of a helicopter.
    Type: Grant
    Filed: February 21, 1980
    Date of Patent: July 27, 1982
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hansjoerg Roesch, Helmut Eberle
  • Patent number: 4339755
    Abstract: A pair of scanning, directional receiving antennas mounted in spaced relation on a monitoring aircraft are synchronously driven at a given scan rate .omega..sub.s and at the same phase angle with respect to the broadside of the antenna pair so that the receiving beams of the antennas are always parallel. A non-scanning source of RF radiation, located at an unknown range from the monitoring aircraft, emits radiation that is received by the scanning antennas at a slight time differential t.sub.21. The received source radiation is converted by separate receiving channels into early and late arriving signals, from which a time interval signal representing t.sub.21 is produced. Concurrently therewith, an angle of arrival .phi. of the source radiation is detected and a signal representative thereof is produced. Also, signals are generated that represent the scan rate .omega..sub.s of the receiving antennas and a distance d equal to the separation between the antennas.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: July 13, 1982
    Assignee: The Boeing Company
    Inventor: James M. Wright
  • Patent number: 4339752
    Abstract: A synthetic array processor wherein radar data, received from an area to be mapped during a plurality of subarray flight path segments, is electronically focused in parallel processing channels to form a series of approximately rectangularly shaped low azimuth resolution maps; and signals associated with corresponding portions of each low resolution map are further processed by means of digital filtering techniques to provide, in a format readily adapted for display, a high azimuth resolution map.
    Type: Grant
    Filed: June 15, 1971
    Date of Patent: July 13, 1982
    Assignee: Hughes Aircraft Company
    Inventors: Frederick C. Williams, William W. Clements
  • Patent number: 4338603
    Abstract: A coherent radar system for using the effects of doppler shift on the disbuted spectrum of a pulse modulated carrier to produce a harmonic relationship between doppler side bands at the frequency of the transmitted pulse repetition frequency. Correlation between adjacent side bands are used to generate a second order doppler signal which has a wavelength equal to the pulse repetition frequency instead of the carrier frequency.
    Type: Grant
    Filed: May 25, 1967
    Date of Patent: July 6, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: William R. Magorian
  • Patent number: 4338550
    Abstract: A line output stage for providing a saw-tooth current in a deflection coil contains a switching circuit between the terminals of the supply source and the terminals of the deflection circuit. The switching circuit acts to reduce the voltage at terminals during the part of the cycle when the transistor is conducting, and so as to increase the voltage during the part of the cycle when the transistor is not conducting. As a result, the voltage at the terminals of the trace capacitor is reduced.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: July 6, 1982
    Assignee: Indesit Industria Elettrodomestici Italiana, S.p.A.
    Inventor: Francesco Marino
  • Patent number: 4337419
    Abstract: A vertical-rate sawtooth waveform amplitude modulates a train of horizontal-rate pulses. Positive and negative pulse clippers receive the pulse train. One generates a clipped waveform during the last half and a zero output for the first half, of a television field. The other generates a clipped waveform during the first half and a zero output the last half of the field. A pair of AC coupled integrators, driven by respective clipped waveforms, generate horizontal-rate sawtooths which are linearly modulated, one from a maximum at the beginning of the field to zero at the center thereof, and one from zero at the center to a maximum at the end of the field. Two pairs of clippers separate the two sawtooths into four half-sawtooths, wherein each is active in a time interval corresponding to respective quadrants of the picture raster. Potentiometers are used to vary the respective waveforms to allow independent correction of the scan in any corner.
    Type: Grant
    Filed: April 1, 1980
    Date of Patent: June 29, 1982
    Assignee: Ampex Corporation
    Inventor: James R. Holzgrafe
  • Patent number: 4336539
    Abstract: A method and apparatus for converting a plan position indicating (PPI) radar image signal into a raster-type video signal and for broadcasting the radar image over an area scanned by the radar beam, where it can be received by a craft traveling within said area. Means are also provided on board each craft for indicating the position of the craft on said image. The PPI radar image signal is first converted to a digital form and stored in a memory unit; then extracted from the memory unit in a format compatible with the television raster display system. The radar image is broadcasted in its PPI form and converted on-board the craft. Means are provided on the crafts for synchronizing the radar image signal with an enhancing signal generated every time the radar beam sweeps over the corresponding crafts.
    Type: Grant
    Filed: February 11, 1980
    Date of Patent: June 22, 1982
    Inventor: Alvin E. Hendrickson
  • Patent number: 4334866
    Abstract: An apparatus which simulates signals received by a radar antenna and which is used for teating radar equipment and for training purposes, Two stores are provided to hold the horizontal and vertical polar diagram characteristics of an antenna, respectively. The appropriate values are read out of these stores by signals representing the azimuth and elevation angles of an imaginary target and the antenna, which may be real or imaginary. The outputs from the stores are combined to give a realistic simulated signal. Since the polar diagram characteristics of an antenna may be different for transmission and reception, each store may be provided in duplicate and the outputs from all four stores combined to produce the simulated signal.
    Type: Grant
    Filed: February 11, 1980
    Date of Patent: June 15, 1982
    Assignee: The Marconi Company Limited
    Inventor: Michael J. Burrows
  • Patent number: 4335335
    Abstract: A television receiver high voltage generator includes a high voltage transformer for developing an ultor accelerating potential at an ultor output terminal. A high voltage protection circuit comprises a comparator and a disabling circuit coupled to an output terminal of the comparator. An ultor accelerating potential representative signal is applied to an input terminal of the comparator to disable normal television receiver operation when the ultor accelerating potential exceeds predetermined values. To avoid nuisance tripping or energization of the disabling circuit at lower beam current levels, beam current information is applied to an input terminal of the comparator such that at low beam current operating levels, a greater ultor accelerating potential must be exceeded before the disabling circuit is energized, than at high beam current operating levels.
    Type: Grant
    Filed: February 11, 1980
    Date of Patent: June 15, 1982
    Assignee: RCA Corporation
    Inventor: Donald H. Willis
  • Patent number: 4335333
    Abstract: A raster scan color display system for a CRT includes a vertical sweep system wherein a parabolic signal repeating at the horizontal sweep rate is multiplied with a vertical sweep signal corresponding to a linear ramp repeating at a vertical deflection rate. The output is differentiated and capacitively coupled to a wideband voltage drive vertical deflection amplifier to provide pin-cushion non-linearity correction.
    Type: Grant
    Filed: January 29, 1980
    Date of Patent: June 15, 1982
    Assignee: Hewlett-Packard Company
    Inventors: Michael Ramsay, Warren Pratt
  • Patent number: 4334173
    Abstract: A horizontal width control circuit for use with an image display apparatus includes first and second variable inductors connected in series and shunt relationship respectively with a horizontal deflection coil. The inductance of the inductors are variable in opposite directions for controlling the extent of horizontal deflection through a relatively large range of values without detuning the horizontal deflection circuits.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: June 8, 1982
    Assignee: Zenith Radio Corporation
    Inventors: Melvin E. Gabriel, Joseph M. Van Baalen
  • Patent number: 4333078
    Abstract: An apparatus for synchronized signal reception wherein a first signal of frequency f.sub.o is transmitted by a first unit and is reflected by a second unit, which thus transmits the reflected second signal. The reflected signal is modulated by information which is supplied by a coding device 27 in said second unit, which coding device generates a coded pulse train 27p in the form consisting of pulses, i.e. information symbols. A pulse generator 28 is controlled by the pulse train to emit a signal with one of two frequencies k.sub.1 and k.sub.2, respectively, in dependence upon the binary state of the pulse train. The signal is divided in a frequency divider 29 to provide frequencies k.sub.1 /n and k.sub.2 /n, respectively, which are supplied to the coding device 27, causing the coding device to emit said pulses with lengths which are related to the cycle lengths of frequencies k.sub.1 /n and k.sub.2 /n, respectively. The signal generated in the pulse generator 28 with the frequencies k.sub.1 and k.sub.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: June 1, 1982
    Assignee: Stiftelsen Institutet for Mikrovagsteknik vid Tekniska Hogskolan i Stockholm
    Inventors: Bengt Henoch, Eilert Berglind
  • Patent number: 4331907
    Abstract: To provide linearity correction to horizontal scanning current, a linearity coil is coupled to the horizontal deflection winding of a horizontal deflection circuit. The magnetic structure of the linearity coil includes a magnetizable material with generally rectangularly cross-sectioned center and end sections. The faces of the end sections are oriented generally perpendicular to an axis of the center section thereby forming an H-bar core. The H-bar core is located inside a plastic coilform cup, with the sides of the cup generally conforming to the shape of the core. Permanent magnets for biasing the H-bar core are located at opposite ends of the coilform cup adjacent the end sections of the core. The linearity coil conductor turns are wound around the coilform cup over the center section of the H-bar core.
    Type: Grant
    Filed: April 4, 1980
    Date of Patent: May 25, 1982
    Assignee: RCA Corporation
    Inventors: David E. Laux, Kenneth E. Meyer
  • Patent number: 4331959
    Abstract: A defective object such as a vehicle normally movable on a lane, assembly ne, or track is detected by a receiver on another object travelling behind the defective object, to avoid rear end collisions with the defective vehicle. For this purpose the vehicles are equipped with a signal receiver and with a signal damping member. The signal is transmitted in a transmission line extending along the lane, assembly line, or track. When a defect occurs, the damping member is moved into a position relative to the transmission line in which the damping member sufficiently dampens the signal so that the next following vehicle fails to receive the signal whereby a warning may be provided that the path ahead is not free or that it is blocked.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: May 25, 1982
    Assignee: Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung
    Inventors: Juergen Brauer, Wolf-Dieter Schuck