Patents Assigned to Northrop Grumman Corp.
  • Patent number: 5619206
    Abstract: A secondary radar uses monopulse reception techniques to improve the estimate of the aircraft position and to improve the reliability of the reply decoding process. Digital signal processing techniques are utilized to replace the analog circuit used in the prior implementations. The secondary radar implements monopulse processing using a half angle phase method wherein the sum and difference signals are encoded in a complete phasor. The detection of the signal and extraction of the azimuth angle data is implemented using a digital receiver concept. The complex phasor is sampled at an intermediate frequency, down converted to baseband and detected. The azimuth angle is computed using arithmetic methods implemented by digital signal processing circuitry.
    Type: Grant
    Filed: November 20, 1995
    Date of Patent: April 8, 1997
    Assignee: Northrop Grumman Corp.
    Inventors: Elbert L. Cole, Jr., Richard A. Enstrom, Terence E. Olver
  • Patent number: 5611955
    Abstract: A substrate for use in semiconductor devices, fabricated of silicon carbide and having a resistivity of greater than 1500 Ohm-cm. The substrate being characterized as having deep level impurities incorporated therein, wherein the deep level elemental impurity comprises one of a selected heavy metal, hydrogen, chlorine and fluorine. The selected heavy metal being a metal found in periodic groups IIIB, IVB, VB, VIB, VIIB, VIIIB, IB and IIB.
    Type: Grant
    Filed: October 18, 1993
    Date of Patent: March 18, 1997
    Assignee: Northrop Grumman Corp.
    Inventors: Donovan L. Barrett, Hudson M. Hobgood, James P. McHugh, Richard H. Hopkins
  • Patent number: 5590536
    Abstract: A cryogenic bypass current lead to bypass quenched magnets in a string of magnets in a superconducting super collider comprises a HTSC section interposed between a lower conductive body terminal and the conductive of the lead is described.
    Type: Grant
    Filed: April 13, 1995
    Date of Patent: January 7, 1997
    Assignee: Northrop Grumman Corp.
    Inventor: Jiing-Liang Wu
  • Patent number: 5532485
    Abstract: An array of superconductive quantum detectors (SQD) with current biased SQUID flowing in one direction from fifty percent of the detectors and flowing in the opposite direction for the other fifty percent. The SQD in one embodiment has a serpentine pattern loop and minimal cross-sectional area to increase kinetic induction. A directly connected SQUID is within the loop of one embodiment and exterior of the loop in another embodiment. Methods of optimizing the signal of the array and different types of Josephson Junctions are also disclosed.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: July 2, 1996
    Assignee: Northrop Grumman Corp.
    Inventors: Nathan Bluzer, Martin G. Forrester