Trung T Nguyen

6664920, Dec 16, 2003

Nov 18, 1993

08/154051

Charles J. Mott - El Segundo CA
Trung T. Nguyen - Huntington Beach CA

Raytheon Company - Lexington MA

G01S 1338

342129, 342 70, 342196

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.

6888490, May 3, 2005

Jul 20, 2004

10/894792

Oleg Brovko - Los Angeles CA, US
Eric Wayne Day - Lomita CA, US
Trung T. Nguyen - Huntington Beach CA, US
Jing Zhao - Moreno Valley CA, US
Mark S. Klemens - Los Angeles CA, US

Raytheon Company - Waltham MA

G01S013/90

342 25A, 342 25 R, 342 25 F

A synthetic aperture radar (SAR) image of a wide coverage area is acquired during a frame containing a first plurality of ambiguities induced in the SAR image from radar scatterers within the area. The area is illuminated with radar pulses and a segmented receive antenna oriented towards the area. The segmented receive antenna has a second plurality of sub-apertures, where the second plurality of sub-apertures is larger than the first plurality of ambiguities. Each sub-aperture has its own receiver. The digital stream from each receiver is stored in a computer for the duration of the frame to obtain frame data. A SAR image is extracted from the frame data. The first plurality of ambiguities are identified from analysis of the frame data, and a correction is computed to account for the first plurality of ambiguities contained within the synthetic aperture image. The correction is applied to reduce distortions caused by the ambiguities in the SAR image.

D535166, Jan 16, 2007

Apr 4, 2005

29/226900

Milo M. Kensrue - Dana Point CA, US
Trung Dinh Nguyen - Laguna Hills CA, US

M.K. Products, Inc. - Irvine CA

0805

D 8 30

7244909, Jul 17, 2007

Apr 4, 2005

11/098773

Milo M. Kensrue - Dana Point CA, US
Trung Dinh Nguyen - Laguna Hills CA, US

M.K. Products, Inc. - Irvine CA

B23K 9/00
B23K 9/12

21913731, 2191377

Several aspects of an in-line welding gun are disclosed. In one aspect, the welding gun has a variable profile insulating boot disposed over the torch barrel of the gun. The variable profile insulating boot may include a molded material having varying thickness to provide the desired insulating properties. In another aspect of the welding gun, a speed control mechanism for the motor driving the wire feed assembly is positioned in a recess in the housing such that it reduces the risk of being unintentionally adjusted during operation of the welding gun. In another aspect of the welding gun, the wire feed mechanism features a feeder roller and an idler roller that may be separated without opening the housing of the welding gun. To separate the rollers, the user may depress a portion on the exterior of the housing to press on a pivotable lever on which the idler roller is disposed.

57422524, Apr 21, 1998

Aug 26, 1996

8/703310

Trung T. Nguyen - Huntington Beach CA
Loan Taree Bui - Rosemead CA

Raytheon Company - Lexington MA

G01S 502

342156

An apparatus for reducing the computational requirements for resolving ambiguity in interferometer measurements where the interferometer elements are arranged arbitrarily. Each of a plurality of interferometer elements each measures the phase of the incoming electromagnetic signal. The interferometer elements are each separated by lengths defined as baselines, which are sorted and processed in ascending order. Following initialization, for each baseline (92, 108), the phase measurements of the next baseline (92, 108) to be processed are estimated. If the measured phases (94-100, 110-118) of the next baseline (92, 108) falls within a predetermined range (104, 106) of the estimated phases, the phase is retained for estimating the phases of the next baseline. After a sufficient number of baselines have been processed, the angle of the incoming electromagnetic signal may be determined in accordance with the retained phases.

51913372, Mar 2, 1993

Feb 25, 1992

7/841133

Oleg Brovko - Los Angeles CA
Trung T. Nguyen - Huntington Beach CA

Hughes Aircraft Company - Los Angeles CA

G01S 1353
G01S 13532

342200

A maximum likelihood estimator and range-only-initialization target detection method employed to detect and resolve targets in a multislope linear frequency modulated waveform radar. The method resolves a large number of target returns without a large amount of signal processing and without creating a significant number of false alarms, or ghosts. The method simultaneously estimates range and doppler for each target. The method rejects undesired long-range targets that fold into target regions, and processes target regions of interest around a nearest target to reduce signal processing throughput requirements. Using a K out of N detection rule, the method detects targets that compete with mainlobe rain clutter, mainlobe ground clutter, and receiver leakage. The method simultaneously estimates target parameters and optimally resolves any number of targets. The method is limited only by the number of frequency modulation ranging slopes, the slope values, and the doppler filter resolution set by the radar waveform design.

57013993, Dec 23, 1997

Dec 20, 1996

8/771311

S. Daniel Lee - San Gabriel CA
Trung D. Nguyen - Tomball TX
Mary P. Czerwinski - The Woodlands TX

Inference Corporation - El Segundo CA

G06F 1518

395 51

A system in which a case-based search engine is integrated into a "help" database. The help database may be organized in a predetermined manner and converted by a computer program into a case-based format. An operator of a "help" program (e. g. , a user who desires on-line help) may request a case-based search of the case-base using case-based methods. The case-based search provides a set of likely cases, i. e. , help topics, from among which the operator may select the next help topic to view. The system may also present matched objects in response to the query, may respond to iterative refinement of the query (in similar manner to known iterative case-based methods) and may order matched objects by quality of match.

20140232581, Aug 21, 2014

Feb 20, 2013

13/772217

- Waltham MA, US
Oleg Brovko - Los Angeles CA, US
Alison Kim - Palos Verdes Estates CA, US
Trung T. Nguyen - Huntington Beach CA, US

RAYTHEON COMPANY - Waltham MA

H03M 1/12

341155

System and method for converting a high bandwidth analog signal to a digital signal including: receiving the high bandwidth analog signal; splitting the high bandwidth analog signal to M parallel channels; delaying the split signal in each channel with N*T delays, respectively; sampling each M delayed signals by M relatively prime sampling rate, wherein the sampling rate for each M delayed signal is smaller than the Nyquist frequency of the high bandwidth analog signal; upsampling each M sampled signal, wherein the upsampling rate for each M sampled signal satisfies the Nyquist frequency of the high bandwidth analog signal; combining the M up sampled signals into a combined signal; and reconstructing the combined signal to generate a digital signal representing the high bandwidth analog signal.