Patents Examined by T. H. Tubbesing
  • Patent number: 5268690
    Abstract: Herein disclosed is a radar system having a function for setting a watch alarm region, which function has been improved in operability. A region displayed in a display part surrounding the radar system is divided by two border lines. One region, for example, a region having a smaller angle contained by the two border lines, is controlled to be set as the watch alarm region in accordance with the first setting instruction from a user, the other region is next controlled to be reset as the watch alarm region when receiving the second instruction from the user within a predetermined time period. Thus, the user may select one between the divided regions as desired, through easy operations. If a wrong region has been selected as the watch alarm region, differently from the user's will, the mistake may be readily corrected.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: December 7, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kenichi Shibata
  • Patent number: 5266954
    Abstract: The present invention provides a microwave vehicle detector which includes a transceiver for transmitting microwave energy into a desired target area and for receiving reflections of this microwave energy from vehicle movement in this target area. The transceiver includes first and second diodes for enabling the microwave vehicle detector to determine the direction of vehicle movement relative to the position of the microwave vehicle detector. In this regard, these diodes are balanced, such that a predetermined phase difference will be produced between the doppler shift signals generated by these diodes. This phase difference is analyzed by a microprocessor to determine the speed and direction of the vehicle being detected.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: November 30, 1993
    Assignee: Microwave Sensors
    Inventors: David P. Orlowski, William R. Lang, Jr.
  • Patent number: 5264856
    Abstract: A method and system for detecting wire in a terrain avoidance, terrain following, or a terrain obstacle system. Radiant energy pulses orthogonally polarized are alternately transmitted. Selected dimensions of a full scattering matrix of adjacent reflected pulses for a particular range are collected and combined to form a null matrix. A null matrix with the two reflected pulses being within a predetermined distance from one another is detected as a wire.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: November 23, 1993
    Assignee: Westinghouse Electric Corp.
    Inventor: Norman E. Thurlow
  • Patent number: 5262785
    Abstract: A small target phased array Doppler detection system receives signals from remote moving targets and determines Doppler frequency shift and the respective powers of coherent electromagnetic signals for the purpose of detection and identification of relatively small, slow moving targets in the presence of scattering echoes due to clutter. The system employs covariance analysis of the received signals followed by eigenanalysis to produce eigenvectors and eigenvalues. A superresolution algorithm creates dwell manifold vectors which indicate velocities of targets from the eigenvectors. The relative power of radar echoes contribute information relevant to the identification of real moving targets as opposed to false alarms.
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: November 16, 1993
    Assignee: General Electric Co.
    Inventors: Seth D. Silverstein, Robert L. Nevin
  • Patent number: 5262783
    Abstract: A unit for detecting a moving person or object by means of doppler frequency shift. The unit comprises a microwave circuit board (1) accommodating an oscillator and a mixer, and an antenna board (2) carrying transmit (8) and receive (9) patch arrays. In the assembled unit the two boards (1,2) are disposed adjacent one another. Coupling between the microwave circuit and the antenna arrays is achieved by two slots (6,11) resonant at the oscillator fundamental frequency and formed in a ground plane (5) on the microwave board (1). Feed striplines (7,10,12) on the two boards (1,2) lie orthogonal to the slots (6,11) and are terminated in T-sections (15,14). The stripline/slot arrangement suppresses emission at the oscillator second harmonic frequency. The antenna board (2) has no electrical connection to the microwave circuit, enabling the radiated beam shape to be changed by simply replacing the antenna board with one having a different patch array pattern.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: November 16, 1993
    Assignee: GEC-Marconi Limited
    Inventors: Andrew G. Philpott, Ian R. Aldred, Robert T. J. Dodd, Reginald F. Humphryes
  • Patent number: 5260708
    Abstract: Synthetic aperture radar data is used to produce a terrain map. Two synthetic radar antennas are placed on an aircraft, which moves in a set of substantially parallel flight paths. At least one antenna repeatedly transmits radar signals whose return echoes are received by both the antennas. The echo signals are processed conventionally to yield slant range and Doppler frequency data for plural resolution cells. The measured phase difference for each resolution cell provides an ambiguous measure of slant range difference to the two antennas needed to determine terrain elevation and correct ground range. As in the prior art, the radar transmissions employ an extended bandwidth of wavelengths. The received echo data is reprocessed using less than the entire bandwidth of the radar transmission to achieve additional center wavelengths. This produces a differing ambiguity interval and permits unambiguous determination of the slant range difference.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: November 9, 1993
    Assignee: Environmental Research Institute of Michigan
    Inventor: James L. Auterman
  • Patent number: 5258720
    Abstract: The digital sample and hold phase detector to compare the phase relationship between input pulses and a high frequency reference clock comprises a digital counter arrangement coupled to count the high frequency reference clock to produce a digital ramp signal and a digital sampling arrangement coupled to at least the input pulses and an output of the counter arrangement to enable the input pulses to sample the digital ramp signal and produce a digital phase difference signal.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: November 2, 1993
    Assignee: ITT Corporation
    Inventors: William J. Tanis, Ning H. Lu, Alan N. Schenberg
  • Patent number: 5258762
    Abstract: Identification system constituted by an interrogation station or interrogator 1 itself formed by a radio frequency wave transceiver and preferably on an ultra frequency wave length 5, and, on the other hand, by a responder unit 2 adapted to receive the wave and to re-emit (echo) it following the given coded modulation to the responder unit. The interrogator is adapted to receive this echoing wave 11 and to demodulate it in order to derive the identification code therefrom. The interrogator has an emission antenna adapted to emit an inquiry signal constituted by a radio wave emitted in plane polarization. The responder unit has two adjacent antennas, respectively, for the reception of the inquiry wave and for its re-emission (echo) after modulation. The two antennas are of the circular polarization type and each functioning in a direction of rotation of the polarization opposite with respect to each other.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: November 2, 1993
    Inventors: Philippe Cabon, Jean-Francois Habigand
  • Patent number: 5252978
    Abstract: A collision warning signal for at least one vehicle is provided by transmitting from the surface of the earth a radio signal, receiving at the surface of the earth, a radio signal returned by a vehicle in response to the transmitted radio signal, determining an elapsed time between the transmitting of the radio signal and the receiving of the corresponding returned radio signal, determining the position of the vehicle at least in part in dependence upon the determined elapsed time, comparing the determined position of the vehicle with terrain data stored in a data base, and generating a warning signal based on the comparison if predetermined parameters are satisfied.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: October 12, 1993
    Assignee: GEC Ferranti Defence Systems Limited
    Inventor: Roger N. Priestley
  • Patent number: 5252981
    Abstract: It has been proposed in accordance with the invention to determine the linearity of the modulated oscillator frequency of an FMCW radar by means of the Hilbert transformation and to supply a control voltage, corresponding to the deviation, to the controllable oscillator via a digital/analog converter. A control and computing unit is used to determine the linearity of the modulated oscillator frequency.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: October 12, 1993
    Assignee: Robert Bosch GmbH
    Inventors: Nicolas Grein, Hermann Winner
  • Patent number: 5250950
    Abstract: A vehicle in free space or air, with external surfaces primarily fashioned from planar facets. The planar facets or panels are angularly positioned to reduce scattered energy in the direction of the receiver. In particular, radar signals which strike the vehicle are primarily reflected at an angle away from the search radar or are returned to the receiver with large variations of amplitude over small vehicle attitude changes.
    Type: Grant
    Filed: February 13, 1979
    Date of Patent: October 5, 1993
    Assignee: Lockheed Corporation
    Inventors: Richard Scherrer, Denys D. Overholser, Kenneth E. Watson
  • Patent number: 5248979
    Abstract: The present invention discloses a dual function satellite imaging and communication system (10, 40, 50, 60) using a solid state mass data storage device (30) which generates and stores image data at a relatively low data rate and subsequently transmits the data at a significantly higher data rate. The dual function imaging and communication system (10, 40, 50, 60), which may be incorporated as a body mounted payload of an imaging satellite, provides a single antenna or aperture (28, 54, 62) to perform both the imaging and communication functions and simplify the imaging and communication systems of the imaging satellite by eliminating the requirement for a separately gimballed antenna and/or aperture for each system. Further, the present invention is designed to operate in a low duty cycle mode to minimize its power supply requirements.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: September 28, 1993
    Assignee: TRW Inc.
    Inventors: Gordon R. Orme, Thomas J. Gritzmacher, Timothy A. Yokote
  • Patent number: 5248976
    Abstract: A method and autofocus processor that is adapted to automatically correct focus phase errors associated with synthetic array radar signals. The method comprises processing the synthetic array radar signals to produce a SAR image; identifying and locating potential targets contained in the SAR image; storing the range bin and azimuth location of the target in a target list; bandpass filtering the SAR signals associated with the target scatterer to remove the interference therefrom; forming the pulse pair product of the phase history samples from each reference target to produce a differential phase function; integrating the differential phase function over all reference targets to provide the averaged differential phase history associated therewith; interpolating the averaged differential phase function to restore the original time scale and number of samples; and computing the focus error from interpolated differential phase history.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: September 28, 1993
    Assignee: Hughes Aircraft Company
    Inventors: Yoji G. Niho, Ralph E. Hudson, Tammy L. Flanders
  • Patent number: 5247305
    Abstract: A movable-object identification system includes an interrogator for transmitting an interrogation signal, and a responder mounted on a movable object for transmitting a reply signal in response to the interrogation signal. The reply signal contains identification information. The responder includes an antenna for receiving the interrogation signal from the interrogator and for radiating the reply signal; and an input device connected to the antenna for receiving an electric power of the interrogation signal received by the antenna. The input device includes a receiving element for dividing the received electric power into a first separation electric power and a second separation electric power corresponding to a traveling and reflected wave of the interrogation signal, respectively. The receiving element has an impedance.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: September 21, 1993
    Assignee: Nippondenso Co., Ltd.
    Inventors: Tatsuya Hirata, Yoshiyuki Kago
  • Patent number: 5247304
    Abstract: Where a signal is to be sent to a transponder passing by an interrogation station, and a signal is to be received back from the device, the station should include one antenna for sending, one or more separate antennas for receiving, and a circuit including a transmit portion, one or more receive portions, and a transmit-receive switch portion.
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: September 21, 1993
    Assignee: Texas Instruments Incorporated
    Inventor: Loek D'Hont
  • Patent number: 5245347
    Abstract: 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 and clutter. The SAR consists, in effect, of four frequency-agile radars sharing quadrants of a single array antenna mounted within a radome on a "four axis" gimbal with a sidelobe cancelling subarray mounted at the phase center of each quadrant. Motion sensors are also mounted on the single array antenna to provide signals for compensating for vibration and stored compensating signals are used to compensate for radomeinduced errors. In addition, a signal processor is shown which is selectively operable to generate radar maps of any one of a number of desired degrees of resolution, such processor being adapted to operate in the presence of clutter or jamming signals.
    Type: Grant
    Filed: December 29, 1980
    Date of Patent: September 14, 1993
    Assignee: Raytheon Company
    Inventors: Gerald A. Bonta, George W. Ogar, Theodore J. Peregrim, Rosario Mangiapane
  • Patent number: 5243349
    Abstract: A method and apparatus for providing a constant scale factor in azimuth and synchronism of data blocks for a second stage fast Fourier transform in a synthetic aperture radar having two stages of FFT by varying the sampling rate at the output of the first stage FFT as an inverse function of range.
    Type: Grant
    Filed: March 17, 1981
    Date of Patent: September 7, 1993
    Assignee: Westinghouse Electric Corp.
    Inventor: James H. Mims
  • Patent number: 5241313
    Abstract: To allow measurement of the angle-of-arrival (AOA) of the radar pulses from an uncooperative ground-based emitter, the method exploits the time doppler shift resulting from the velocity of a high performance aircraft and the high maneuver ability available to such aircraft to form initial angle calculations. These initial angle calculations along with inherent radar stability are then used for subsequent AOA measurements. The aircraft is flown at a constant velocity V.sub.B along successive legs with an angle .phi..sub.K between successive legs, and the velocity V.sub.B and the angles .phi..sub.K are found using a navigation system such as GPS or inertial navigation. The time difference T.sub.n '-T.sub.1 ' is measured between the arrival of the first and last of n pulses for each sample. A general approximation equation of T.sub.n '-T.sub.1 ' is normalized such that for any K samples the following equation applies,e.sub.K =R(1-s cos .phi..sub.K)1wherein .theta..sub.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: August 31, 1993
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Rudy L. Shaw, Nicholas A. Pequignot
  • Patent number: 5239309
    Abstract: An impulse radar that forms a predetermined radar pulse train in space by transmitting individual spectral components thereof. Thus, a train of extremely short pulses is obtained without switching a radio frequency signal on and off at a high rate. An oscillator is coupled to a harmonic generator, and a power divider distributes the output of the harmonic generator to a multiplicity of amplifiers. Each amplifier has a phase-locked VCO circuit that provides frequency accuracy, spectral purity, low noise and frequency stability. Thus, each amplifier provides one of the spectral components of the predetermined radar pulse train. The amplifiers are coupled to a multiplexing feed that illuminates a reflector. On receive, the multiplexing feed separates the spectral components of the incoming pulse train. Each spectral component is coupled to its own narrow band receiver, and one receiver is used to amplify and detect each spectral component.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: August 24, 1993
    Assignee: Hughes Aircraft Company
    Inventors: Raymond Tang, James G. Small
  • Patent number: 5237330
    Abstract: Intrusion detection apparatus including a microwave transmitter comprising a generally unshielded dielectric resonating oscillator, whose parasitic field is radiated within a volume and Doppler detection apparatus for sensing received Doppler signals reflected by a moving object within the volume.
    Type: Grant
    Filed: May 14, 1992
    Date of Patent: August 17, 1993
    Assignee: Visonic Ltd.
    Inventors: Kotlicki Yaacov, Moshe Kotlicki, Alexander Baber