Henry Youchee Lee

US Patent:

7071866, Jul 4, 2006

Filed:

Mar 26, 2004

Appl. No.:

10/809369

Inventors:

David R. Iny - Baltimore MD, US
Mark D. Stenoien - Columbia MD, US
Henry E. Lee - Ellicott City MD, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

G01S 13/74

US Classification:

342 42, 375130

Abstract:

An airborne radar interrogates tags on friendly ground vehicles, which when interrogated by a downlink signal from the radar, sends back a very low level uplink message signal that appears noise-like so as to avoid enemy detection and exploitation. This is achieved by retransmitting a time delayed and phase shifted version of the transmitted pulse from the radar. The digital RF tag captures every other pulse from the radar and transmits a digitally coded spread spectrum pulse back to the radar during every other intervening pulse which includes a pseudo random delay (range hop) and a pseudo random phase (direction).

US Patent:

43131166, Jan 26, 1982

Filed:

Jan 30, 1980

Appl. No.:

6/116681

Inventors:

Norman F. Powell - Ilchester MD
Henry E. Lee - Columbia MD
Francisco J. Guillen - Ellicott City MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H04B 700

US Classification:

343100LE

Abstract:

A system for adjusting the sidelobe response of a main antenna is disclosed. This iterative process results permits the sidelobe canceling in sequential step reduction in interference thereby greatly reducing the time required to respond to changes in the characteristics of the interference. The response of the phased array is adjusted by combining the composite signal from the main antenna with signals from auxiliary channels which have an adjustable phase and amplitude. The desired amplitude and phase of the auxiliary channels is determined using an iterative mathematical process which emphasizes the most recent data. Emphasizing the most recent data permits the system to be used in the scanning mode or to reduce interference from moving sources.

US Patent:

43621066, Dec 7, 1982

Filed:

Apr 21, 1980

Appl. No.:

6/142548

Inventors:

Carl J. Campagnuolo - Potomac MD
Henry C. Lee - Annapolis MD

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

F42C 1100

US Classification:

102207

Abstract:

An air deflector is provided for the air inlet means of a fuze ogive. The flector comprises a stationary deflecting surface which is configured so as to substantially reduce the amount of air entering the ogive during high velocity flight, while not substantially reducing the air inflow during relatively low velocity flight.

US Patent:

52949338, Mar 15, 1994

Filed:

Jan 29, 1993

Appl. No.:

8/010938

Inventors:

Henry E. Lee - Ellicott City MD
James H. Mims - Millersville MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 13536

US Classification:

342159

Abstract:

A wideband radar apparatus is provided having improved interference suppression characteristics. The known time versus bandwidth characteristic of the transmitted pulse is utilized to effect intermediate frequency bandwidth reduction in received swath echo signals. During the interpulse period, basebanded swath echo signals are then subjected to a series of adaptive interference suppressing updates. The adaptive weight vector produced during each of these updates is then applied to the same data used to generate the weights. Preferably, adaptive weight generation is performed in a systolic array according to a QR decomposition algorithm.

US Patent:

42989426, Nov 3, 1981

Filed:

Dec 19, 1979

Appl. No.:

6/105363

Inventors:

Henry E. Lee - Columbia MD

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

G06F 1520
G06F 7552

US Classification:

364483

Abstract:

A nonlinear amplitude detector generates signal amplitude from the signal's inphase and quadrature components based on a Binomial series expansion. The amplitude detector significantly reduces the processing requirement from an ideal square root operation and yet provides much improved error performance over a conventionally used linear amplitude detector. In operation, the inphase and quadrature signal components are compared for relative magnitude and the smaller magnitude signal component is squared and divided by the large magnitude signal component. The quotient from this operation is multiplied by a coefficient that is selected to provide desired amplitude error deviation characteristics. Signal amplitude is then determined by summing this product with the larger magnitude signal component.

US Patent:

51929562, Mar 9, 1993

Filed:

Nov 13, 1991

Appl. No.:

7/790909

Inventors:

Henry E. Lee - Ellicott City MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 7288
G01S 1330

US Classification:

342204

Abstract:

The present invention is a system that performs code compression in stages where each stage includes two processing paths 36 and 38. The two paths allow bidirectional crossover cascade complementary code compression reducing the number processing stages to log. sub. 2 N and reducing the number of processing by a factor of N/(2 log. sub. 2 N) where N is the length of the code. Each path includes a delay provided by a delay unit 44 and each path arithmetically combines the data from its own path with data from the other path. The upper path 36 uses an adder 40 while the lower path uses an adder/substracter unit 42 which adds or subtracts depending on the phase of the transmitted complementary phase code. The delay provided in each stage increases in a binary progression with the delay of the last stage being N/2. A systolic processor 68 is the preferred embodiment although the invention could be implemented in a programmable digital signal processor.

US Patent:

46268537, Dec 2, 1986

Filed:

Jul 20, 1984

Appl. No.:

6/632979

Inventors:

Henry E. Lee - Columbia MD
Michael B. Seldes - Rockville MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 728
G01S 1328

US Classification:

342132

Abstract:

A pulse compression signal processor suitable for use in a phase-coded, pulse compression radar for decoding the phase coded radar return pulses to enhance the resolvability of objects in range is disclosed. The pulse compression signal processor includes a conventional correlation processor operative in accordance with an initial filter function to convert a signal representative of the phase-code of the transmittal RF pulse to effect the range correlation response thereof. The resulting range correlation response is modified in accordance with a desired range correlation response. Both the phase code representative signal and the desired range correlation response signal are converted by fast Fourier transformations into their corresponding frequency domain signals which are divided to effect a desired filter function signal for use in decoding the phase-coded radar return pulses to effect substantially the desired range correlation response thereof. The pulse compression signal processor further includes an interative process to truncate the desired filter function signal in time in accordance with pre-established criteria.

US Patent:

45819998, Apr 15, 1986

Filed:

Apr 12, 1984

Appl. No.:

6/599379

Inventors:

Carl J. Campagnuolo - Potomac MD
Henry C. Lee - Menlo Park CA

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

F42C 2100

US Classification:

102293

Abstract:

Apparatus to simulate supersonic high altitude flight for air driven eleccal generators. First and second air-tight chambers are provided, as are means for evacuating the chambers to a preselected pressure. The air driven generator has both air inlet means and air outlet means. The air inlet means of the air driven generator is in fluid communication with the second air-tight chamber, and the air outlet means of the air driven generator is in fluid communication with the first air-tight chamber. Adjustable orifice means are provided. Valve controlled air inlet means for allowing air to enter the second air-tight chamber through the adjustable orifice means are also provided.

Address:

17721 Georgia Ave, Olney, MD 20832

VIN:

1G1ZT57F27F240396

Make:

CHEVROLET

Model:

MALIBU

Year:

2007