Patents Represented by Attorney, Agent or Law Firm Glenn H. Lenzen, Jr.
  • Patent number: 6690696
    Abstract: A laser cooling apparatus and method. Generally, the inventive apparatus includes a mechanism for transporting sensible thermal energy from a solid state laser and for communicating waste fluorescent radiation therefrom as well. In the illustrative embodiment, the apparatus includes an optically transparent manifold with an inlet port, an exhaust port and a plurality of spray nozzles therebetween adapted to direct a cooling fluid on the laser medium of a laser. In addition, the optically transparent manifold is used to permit waste fluorescent radiation to escape the confines of the laser and cooling system means such that said fluorescent radiation may be optically directed to an external heat sink such as free space.
    Type: Grant
    Filed: June 14, 2002
    Date of Patent: February 10, 2004
    Assignee: Raytheon Company
    Inventors: Robert W. Byren, William S. Griffin, Alexander A. Betin
  • Patent number: 6680236
    Abstract: A method is provided for improving edge terminations in a semiconductor device while maintaining breakdown voltage of said semiconductor device at or near its theoretical limit. The method comprises: employing ion-implantation to create a compensated region around the semiconductor device, followed by wet chemical etching to form a mesa on the order of 0.2 to 0.3 &mgr;m. The method provides a simple but novel approach to fabricate edge terminations in semiconductor devices in general and in devices employing p-n junctions such as in a GaAs heterojunction bipolar transistor (HBT) to achieve near-ideal electrical characteristics at the device edge. Instead of traditional edge beveling techniques such as those involving grinding, sandblasting, or mesa-etching using masks, the technique disclosed herein utilizes ion-implantation to create a compensated region around the device and wet chemical etching to make a shallow mesa.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: January 20, 2004
    Assignee: Raytheon Company
    Inventors: Tahir Hussain, Mary C. Montes
  • Patent number: 6677899
    Abstract: A microelectromechanical system (MEMS) steerable electronically scanned lens array (ESA) antenna and method of frequency scanning are disclosed. The MEMS ESA antenna includes a MEMS E-plane steerable lens array and a MEMS H-plane steerable linear array. The MEMS E-plane steerable lens array includes first and second arrays of wide band radiating elements, and an array of MEMS E-plane phase shifter modules disposed between the first and second arrays of radiating elements. The MEMS H-plane steerable linear array includes a continuous transverse stub (CTS) feed array and an array of MEMS H-plane phase shifter modules at an input of the CTS feed array. The MEMS H-plane steerable linear array is disposed adjacent the first array of radiating elements of the MEMS E-plane steerable lens array for providing a planar wave front in the near field.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: January 13, 2004
    Assignee: Raytheon Company
    Inventors: Jar J. Lee, Clifton Quan, Brian M. Pierce
  • Patent number: 6677885
    Abstract: Signal processing methods useful in single-antenna multiple-pass interferometric synthetic aperture radars. The signal processing methods compute an initial elevation estimate from the phase difference between a pair of images (A0, A1) with a relatively small elevation angle difference (i.e., a short interferometric baseline) and uses it to initialize the elevation estimation process for pairs of images (A0, A2) with longer interferometric baselines. The method may be used to process images that are coherent, or not necessarily mutually coherent. The outputs of the methods comprise a terrain elevation map that mitigates for atmospheric error and a turbulence map.
    Type: Grant
    Filed: January 2, 2003
    Date of Patent: January 13, 2004
    Assignee: Raytheon Company
    Inventor: Robert T. Frankot
  • Patent number: 6677897
    Abstract: A microwave transmitter circuit including a divider series feed signal line, collector series feed signal line, a plurality of parallel solid state amplifier coupler circuits connected between the divider series feed line and the collector series feed line, and phase shifting circuitry distributed along the collector series feed line for compensating phase tracking error between the divider series feed line and the collector series feed line.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: January 13, 2004
    Assignee: Raytheon Company
    Inventor: Stan W. Livingston
  • Patent number: 6677588
    Abstract: An improved detector assembly 10 having decreased sensitivity both to Narcissism and to stray light ghosting is disclosed herein. The improved detector assembly 10 of the present invention includes a housing 70 having an input aperture 142 in communication with a chamber within said housing. A detector 130 for sensing electromagnetic energy passing through the input aperture 142 within a first field of view is mounted within the chamber. Also mounted within the chamber is a detector mirror 100 for reflecting energy passing through the input aperture 142 within a second field of view outside of the first field of view. The improved assembly 10 of the present invention further includes a second mirror 110 mounted within the chamber for reflecting energy reflected by the first mirror 100 through the input aperture 142.
    Type: Grant
    Filed: December 13, 1988
    Date of Patent: January 13, 2004
    Assignee: Raytheon Company
    Inventor: Russell D. Granneman
  • Patent number: 6674340
    Abstract: A switched loop RF radiator circuit, comprising a radiator element, a RF input/output (I/O) port, and a balun coupled between the radiator element and the (I/O) port. The balun includes a 180° switched loop circuit having transmission line legs coupled to a balun transition to provide a selectable phase shift, and a microelectromechanically machined (MEM) switch Many radiator circuits can be deployed in an electronically scanned antenna array.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: January 6, 2004
    Assignee: Raytheon Company
    Inventors: Clifton Quan, Brian M. Pierce
  • Patent number: 6674380
    Abstract: Differential heating is avoided by a digital to analog converter for generating analog cyclical waveforms having a period. The cyclical waveforms are generated by conversion of a sequence of step wise linearly incrementing digital phase words presented during the period for conversion. The digital to analog converter has a clock for operating conversion timing within the digital to analog converter. The clock generates a clock pulse for conversion of each of the digital phase words by said digital to analog converter while generating the cyclical waveform. A lookup read only memory for converting each of the incrementing digital phase words within the period into a plurality of ON commands to be used by a plurality of current sources. The plurality of ON commands are timed to generate the cyclical waveforms and have nearly equal time duration approximating a 50 percent duty cycle. The cyclical waveform has one or more non-linear portions reflected in the content of the read only memory.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: January 6, 2004
    Assignee: Raytheon Company
    Inventor: Kenneth Alan Essenwanger
  • Patent number: 6670907
    Abstract: A system and method for efficient phase error correction in range migration algorithm (RMA) for synthetic aperture radar (SAR) systems implemented by making proper shifts for each position dependent phase history so that phase correction can readily be performed using the aligned phase history data during batch processing. In its simplest form, the invention (44) is comprised of two main parts. First (60), alignment of the phase error profile is achieved by proper phase adjustment in the spatial (or image) domain using a quadratic phase function. Second (62), the common phase error can be corrected using autofocus algorithms. Two alternative embodiments of the invention are described. The first embodiment (44a) adds padded zeros to the range compressed data in order to avoid the wrap around effect introduced by the FFT (Fast Fourier Transform). This embodiment requires a third step (64): the target dependent signal support needs to be shifted back to the initial position after phase correction.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: December 30, 2003
    Assignee: Raytheon Company
    Inventor: Kwang M. Cho
  • Patent number: 6670596
    Abstract: A system (100) and method for focal plane array calibration using an internal non-uniform calibration source (30). In the illustrative embodiment, the system (100) includes a first mechanism (16) for calculating a relative gain of each detector element in the focal plane array (20) relative to at least one reference element, a second mechanism (17) for obtaining the absolute gain of the reference element, and a third mechanism (18) for calculating the absolute gains for all other detector elements using the relative gains in conjunction with the absolute gain of the reference element. The relative response of each pixel is calculated from measurements of the response of each pixel using an internal calibration source (30) at two or more different source positions, and two illumination intensities at each position. Measurements using a pair of source positions separated by k pixels establishes the relative response of the ith pixel with respect to the (i+k)th pixel.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: December 30, 2003
    Assignee: Raytheon Company
    Inventors: Cheng-Chih Tsai, Chungte W. Chen
  • Patent number: 6671754
    Abstract: Techniques for converting input data from a multiplicity of sources that are mutually asynchronous, to a single, common synchronous format for local processing by an information processor. Logical operations are described which control first-in-first-out (“FIFO”) buffers to align all inputs to a predetermined point in the data flow or processing sequence, and which maintain clock-by-clock alignment of the input data sequences for an indefinite period of time thereafter.
    Type: Grant
    Filed: August 10, 2000
    Date of Patent: December 30, 2003
    Assignee: Raytheon Company
    Inventor: William D. Farwell
  • Patent number: 6667479
    Abstract: A microbolometer unit cell (10) includes a substantially planar upper-level incident radiation absorption and detection structure (24), a substantially planar middle-level radiation reflection structure (26) spaced apart from the upper-level incident radiation absorption and detection structure for defining an optical resonant cavity (36) there between, and a substantially planar lower-level thermal isolation leg structure (20) spaced apart from the middle-level radiation reflection structure and electrically coupled to the upper-level incident radiation absorption and detection structure and to an underlying readout circuit. The lower-level thermal isolation leg structure is electrically coupled to the upper-level incident radiation absorption and detection structure through a leg (44) that passes through an aperture (48) within the middle-level radiation reflection structure, the leg also functioning as a structural support member.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: December 23, 2003
    Assignee: Raytheon Company
    Inventor: Michael Ray
  • Patent number: 6667519
    Abstract: A mixed technology microcircuit including a first circuit fabricated on a first layer with a first technology and a second circuit fabricated on a second layer with a second technology. In the illustrative embodiment, the first circuit is fabricated with silicon germanium (SiGe) technology and the second circuit is fabricated with complementary metal-oxide semiconductor (CMOS) technology. In an illustrative application, the first circuit includes a high-speed data receiver and a high-speed data transmitter. In the illustrative implementation, the data receiver includes a line receiver, a data and clock recovery circuit, and a demultiplexer and the data transmitter includes a multiplexer, a data and clock encoding circuit, and a line driver.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: December 23, 2003
    Assignee: Raytheon Company
    Inventors: William D. Farwell, Lloyd F. Linder, Clifford W. Meyers, Michael D. Vahey
  • Patent number: 6666351
    Abstract: A dispenser structure for chaff countermeasures includes at least one chaff dispenser having a dispenser tube with a tube sidewall, a dispensing opening, and a female thread structure in an inner surface of the tube sidewall, and a male worm gear engaged to the female thread structure of the dispenser tube. A drive structure has a motor mount upon which the worm gear is rotatably supported, with the motor mount being mechanically reacted to prevent the motor mount from turning, and a drive motor affixed to the motor mount and having a motor output connected to the worm gear to controllably turn the worm gear. Chaff countermeasures are disposed within the dispenser tube between the worm gear and the dispensing opening, so that they may be pushed out the dispensing opening as the motor turns the worm gear.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: December 23, 2003
    Assignee: Raytheon Company
    Inventors: Andrew D. Hartz, Charles M. Poi, Jr., Robert A. Bailey
  • Patent number: 6666123
    Abstract: Energy (110) and mission data (108) for a guided projectile are transferred from a projectile setter (102) over an inductive interface (118). The projectile may include energy storage element (114) to store the energy and a data storage element (112) to store the mission data. Precision GPS clock circuitry (316) of the projectile may receive power from a capacitive energy storage (304) element during projectile loading until a flight battery (320) is activated. In one embodiment, the capacitive energy storage element (304) includes at least one super capacitor (322) and a gun-hardened capacitor (324). The clock circuitry (316) may receive power from the gun-hardened capacitor (324) if the super capacitor (322) fails during the launching operation. The capacitive energy storage element (304) may include one-way energy transfer elements (326) coupled between the super capacitor (322) and the gun-hardened capacitor (324).
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: December 23, 2003
    Assignee: Raytheon Company
    Inventors: Tovan L. Adams, Eric C. Maugans, W. Norman Lange, Jr.
  • Patent number: 6662700
    Abstract: A method for protecting an aircraft against a threat that utilizes an infrared sensor includes providing a plurality of dispensable infrared sources transported in an infrared-source dispenser with the aircraft. A set of infrared-emitting properties of the infrared sources is selected responsive to a set of infrared detecting characteristics of the infrared sensor. A modulated pattern of the infrared sources is dispensed from the infrared-source dispenser responsive to at least one of the set of infrared detecting characteristics of the infrared sensor, and a geometric engagement scenario of the aircraft and the threat.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: December 16, 2003
    Assignee: Raytheon Company
    Inventor: Mary Dominique O'Neill
  • Patent number: 6664920
    Abstract: A cancellation technique embodied in a system and a radar signal processing method that is employed to detect near-range targets. The present invention uses a frequency-modulation continuous-wave (FMCW) or stepped frequency waveform and is capable of detecting near-range targets that would normally be obscured by transmitter leakage and internal reflections. This cancellation technique works by transmitting one or more reference ramp signals and then subtracting the coherent average of the transmitted reference ramp signals from a group of succeeding transmitted and received ramp return -signals. The resulting group of FM ramp return signals is noncoherently integrated to achieve more stable target detection statistics. More particularly, the present technique implements the following processing steps. Generating a predetermined number of reference ramp signals. Coherently averaging target return signals corresponding to transmitted reference ramp signals to produce a reference average signal.
    Type: Grant
    Filed: November 18, 1993
    Date of Patent: December 16, 2003
    Assignee: Raytheon Company
    Inventors: Charles J. Mott, Trung T. Nguyen, Edmond E. Griffin, II
  • Patent number: 6664124
    Abstract: A number of optical devices are fabricated by forming a pattern of channels on a first side of a substrate to define a plurality of mesas on the first side of the substrate. A thin-film optical structure is deposited onto each of the mesas. An excess thickness of the substrate is removed from each thin-film optical device, preferably by temporarily affixing a temporary support to the tops of each thin-film optical structure, removing an excess amount of the substrate from a second side of the substrate so that the thin-film optical devices are isolated from each other but affixed to the temporary support, and separating the tops of the thin-film optical structures from the temporary support.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: December 16, 2003
    Assignee: Raytheon Company
    Inventors: Conrad Stenton, Lothar Scheld, Margarete Neumann
  • Patent number: 6663395
    Abstract: An electrical joint that couples electric signals and current between objects that move relative to one another. A conductive slurry is disposed upon a first object and a conductor extends from a second object to engage the conductive slurry. The slurry comprises conductive particle suspended in a fluid carrying agent, such as oil. A non-conductive gel may be disposed upon the exposed surface of the conductive slurry to retain and protect it. The conductive slurry and non-conductive gel may be disposed within a channel on the object's surface so as to define their position and retain them in the desired area. The position of the conductive slurry is oriented and aligned to maintain continuous contact with the conductor as movement occurs. Linear, planar, circular and other movements are contemplated. The electrical joint can be readily adapted to printed circuit and printed wire technology.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: December 16, 2003
    Assignee: Raytheon Company
    Inventor: Mohi Sobhani
  • Patent number: 6661369
    Abstract: A system and method (44) for focusing an image oriented in an arbitrary direction when the collected synthetic aperture radar (SAR) data is processed using range migration algorithm (RMA). In accordance with the teachings of the present invention, first (60) the data is skewed so that the direction of smearing in the image is aligned with one of the spatial frequency axes of the image. In the illustrative embodiment, the smearing is aligned in the vertical direction. This is done through a phase adjustment that was derived from the requirements for proper shift in the spatial frequency domain. Next (62), the signal support areas from all targets are aligned by proper phase adjustment in the spatial (or image) domain. Finally (64), the common phase error can be corrected using autofocus algorithms.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: December 9, 2003
    Assignee: Raytheon Company
    Inventor: Kwang M. Cho