Patents Assigned to Northrop Gruman Corporation
  • Patent number: 7633852
    Abstract: A wireless control system for ground-mobile robotic systems in which communication between the operator control unit and the unmanned ground vehicle is transmitted via a plurality of spectrally efficient simplex communication links.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: December 15, 2009
    Assignee: Northrop Gruman Corporation
    Inventors: Steven C. Brummette, Christopher True
  • Patent number: 7361978
    Abstract: A laser diode package includes a heat sink, a laser diode, and an electrically nonconductive (i.e. insulative) substrate. The laser diode has an emitting surface and a reflective surface opposing the emitting surface. The laser diode further has first and second side surfaces between the emitting and reflective surfaces. The heat sink has an upper surface and a lower surface. The first side surface of the laser diode is attached to the heat sink adjacent to the upper surface. The substrate is attached to the lower surface of the heat sink. The heat sink is made of heat conducting metal such as copper and the substrate is preferably made from gallium arsenide. The substrate is soldered to the heat sink as is the laser diode bar. Due to the presence of the substrate at the lower end of the heat sink, each individual laser diode package has its own electrical isolation. Several packages can be easily attached together to form a laser diode array.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: April 22, 2008
    Assignee: Northrop Gruman Corporation
    Inventor: Edward F. Stephens
  • Patent number: 7119942
    Abstract: A micro-electrical mechanical system (MEMS) mirror assembly including an array of micro-mirrors formed on a substrate and having springs on one side and which angularly tilt between ON and OFF states in response to an electrostatic force generated by a voltage applied to an electrode located on the substrate. At least one, but preferably two springs in the form of two thin strips of metal attach to post(s) at the side edge of the mirror and act as springs which provide a restoring force when the mirror is tilted between an OFF state which occurs when the mirror is flat relative to the substrate with no voltage applied, and in the ON state when the mirror is tilted when a voltage is applied.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: October 10, 2006
    Assignee: Northrop Gruman Corporation
    Inventors: Harvey C. Nathanson, Robert S. Howell, Garrett A. Storaska, John B. Goodell, Stephen D. Vancampen
  • Patent number: 7068745
    Abstract: A multi-carrier receiver system and method for receiving a transmission frequency multi-carrier signal include a feedforward cancellation loop. A frequency conversion circuit generates an intermediate frequency (IF) multi-carrier signal based on the transmission frequency multi-carrier signal. The feedforward cancellation loop generates an amplitude corrected multi-carrier signal based on the IF multi-carrier signal such that the amplitude corrected multi-carrier signal has a reduced dynamic range with respect to the IF multi-carrier signal. A primary A/D converter having a significantly lower dynamic range requirements can therefore generate a digital multi-carrier signal based on the amplitude corrected multi-carrier signal. The feedforward cancellation loop therefore enables the primary A/D converter to process multi-carrier signals without the need for large dynamic range requirements.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: June 27, 2006
    Assignee: Northrop Gruman Corporation
    Inventors: Mark Kintis, Robert R. Harnden, Kenneth B. Weber, Mark V. Keller, Donald L. Lochhead, Donald R. Martin
  • Patent number: 5910956
    Abstract: A method for generating a random time interval suited for use in defining re-transmission time intervals so as to avoid communication contention utilizes at least one external seed and a plurality of linear maximal sequences. According to one embodiment, a first seed is provided and a first linear maximal sequence is initialized therewith. A second seed is generated via cooperation of the first linear maximal sequence and the external signal. At least one second linear maximal sequence is initialized with the second seed. A new time interval is started when the second linear maximal sequence sequences to a predetermined value.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: June 8, 1999
    Assignee: Northrop Gruman Corporation
    Inventors: Warren E. Guthrie, Michael J. Trainor
  • Patent number: 5667587
    Abstract: A silicon carbide growth container for placement into a crystal growing furnace. The growth container has a liner of pyrolytic graphite which seals the inside of the container and allows for easy removal of the grown silicon carbide crystal.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: September 16, 1997
    Assignee: Northrop Gruman Corporation
    Inventors: Robert C. Glass, Walter E. Gaida, Ronald R. Ronallo, Hudson McDonald Hobgood