Ning Lu

US Patent:

7944389, May 17, 2011

Filed:

Jul 9, 2009

Appl. No.:

12/500256

Inventors:

Ning H. Lu - Parsippany NJ, US
Peter D. Steensma - Green Pond NJ, US

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

G01S 7/36

US Classification:

342 13, 342 42, 342190, 342191, 702 5, 702127

Abstract:

Systems and methods for monitoring and classifying RF emissions in the field include storing an electronic signature map (ESM) of a selected geographic area, where the electronic signature map includes previously detected emitter closeness measures (ECMs) in the selected geographic area. The ECMs are representative of detected sources of radio frequency energy. A RF energy emission is detected, a new ECM for that RF energy emission is created, and that the new ECM is compared with the ECMs in the ESM. That comparison may help to determine whether the RF energy emission should be considered a threat.

US Patent:

20130182748, Jul 18, 2013

Filed:

Jan 13, 2012

Appl. No.:

13/349955

Inventors:

Qun Shi - Plainsboro NJ, US
Jonathan E. Rose - Fort Wayne IN, US
Ning Hsing Lu - Clifton NJ, US

Assignee:

EXELIS INC. - McLean VA

International Classification:

H04B 1/709
H04B 1/707

US Classification:

375150, 375E01002

Abstract:

Enhanced reception in a communication system is achieved by performing radio synchronization (SYNC) detection after multipath signal components are combined via a Rake combiner. In a communication system comprising a transmitter and a receiver, plural multipath signal components of a signal transmitted by the transmitter are received by the receiver. The plural multipath signal components are correlated with a known spreading code (e.g. a PN code). The correlated multipath signals are analyzed to identify plural correlation peaks and those correlation peaks that exceed a multipath threshold are selected. The selected correlation peaks are combined (i.e., coherently combined) to produce a combined signal. A synchronization event is declared when the combined signal exceeds an adjusted synchronization threshold and the combined signal is then decoded.

US Patent:

52587207, Nov 2, 1993

Filed:

Mar 2, 1984

Appl. No.:

6/585651

Inventors:

William J. Tanis - Wayne NJ
Ning H. Lu - Parsippany NJ
Alan N. Schenberg - Kinnelon NJ

Assignee:

ITT Corporation - New York NY

International Classification:

H03D 1300

US Classification:

328133

Abstract:

The digital sample and hold phase detector to compare the phase relationship between input pulses and a high frequency reference clock comprises a digital counter arrangement coupled to count the high frequency reference clock to produce a digital ramp signal and a digital sampling arrangement coupled to at least the input pulses and an output of the counter arrangement to enable the input pulses to sample the digital ramp signal and produce a digital phase difference signal.

US Patent:

46226494, Nov 11, 1986

Filed:

Jul 11, 1983

Appl. No.:

6/512811

Inventors:

Ning H. Lu - Parsippany NJ

Assignee:

International Telephone and Telegraph Corporation - New York NY

International Classification:

G06F 15336
H04B 1406

US Classification:

364728

Abstract:

The object of the present invention is to provide an improved convolution processor that requires no multiplication operations and can easily be implemented digitally. The convolution processor comprises a first delta analog to digital converter disposed in a first path for one of first and second input waveforms being operated on to provide a convolution function to convert signals in the first path to a digital version thereof having a delta modulation format; a second delta analog to digital converter disposed in a second path for the other of the first and second input waveforms to convert signals in this second path to a digital version thereof having the delta modulation format; a summer coupled to the output of the first and second paths and a pair of integrators coupled in any of the following manner in the above circuit; namely, in the first path, in the second path, in the first and second paths, in the output of the summer, in the first path and the output of the summer, and in the second path and the output of the summer. The convolution function is provided at the output of the summer when the pair of integrators is coupled in the first path, the second path and in the first and second paths while the convolution function output is provided at the output of at least one of the pair of integrators when the pair of integrators is coupled in the output of the summer, in the first path and the output of the summer and, in the second path and the output of the summer.

US Patent:

52587240, Nov 2, 1993

Filed:

Dec 30, 1983

Appl. No.:

6/566947

Inventors:

William J. Tanis - Wayne NJ
Ning H. Lu - Parsippany NJ
Alan N. Schenberg - Kinnelon NJ

Assignee:

ITT Corporation - New York NY

International Classification:

H03L 722
H03B 1900

US Classification:

331 1A

Abstract:

The fractional division frequency synthesizer comprises a digital ramp generator producing a digital correction ramp controlled by a frequency control programmer; a divide by N divider coupled to an output of a voltage controlled oscillator with the divider being controlled by the program, where N is a selected one of an integer and a fraction one or greater; a digital phase detector coupled to a reference clock and the output of the divider to provide a digital phase error signal; a digital adder coupled to an output of the ramp generator and the phase detector to produce a ramp corrected digital phase error signal; and circuit arrangement coupled to an output of the adder and a control input of the controlled oscillator to convert the ramp corrected digital phase error signal to a ramp corrected analog phase error signal to control the controlled oscillator and thereby provide a controlled frequency signal at the output thereof.

US Patent:

45596069, Dec 17, 1985

Filed:

Jul 11, 1983

Appl. No.:

6/512280

Inventors:

Maurice L. Jezo - Cedar Grove NJ
Ning H. Lu - Parsippany NJ

Assignee:

International Telephone and Telegraph Corporation - New York NY

International Classification:

G06F 15336

US Classification:

364728

Abstract:

The arrangement comprises a plurality of correlation means coupled to the received signal with the received signal being clocked into each of the plurality of correlation means by a different one of a plurality of different phased clocks with the different phased clocks occurring at a predetermined different time uniformly spaced over a given time interval and integration means coupled to each of the plurality of correlation means to provide the indication of the time of arrival of the received signals. The plurality of correlation means includes a plurality of shift registers into which the received signals are shifted by a different one of the plurality of phased clocks, a reference signal register and a plurality of comparison means each coupled to each stage of a different one of the plurality of shift registers and each stage of the common reference signal shift register to compare the contents of the associated stages of the plurality of signal shift registers and the single common reference signal shift register and to produce an output signal indicative of the results of each of the comparisons.

US Patent:

45596077, Dec 17, 1985

Filed:

Jul 11, 1983

Appl. No.:

6/512810

Inventors:

Ning H. Lu - Parsippany NJ

Assignee:

International Telephone and Telegraph Corporation - New York NY

International Classification:

G06F 15336

US Classification:

364728

Abstract:

The arrangement comprises N signal channels each responsive to a different one of N signals where N is an integer greater than one. Each of the N signal channels includes a sampling circuit to sample the associated one of the N signals by a different one of N phase clocks with each of the N phase clocks sampling a different one of the N signals at a predetermined different time uniformly spaced over a given time interval. A delay means is coupled to each of the sampling circuits to time align the outputs of each of the sampling circuits so that all sampled signal pulses are time shifted consistent with the associated sampling clock phases. A correlator is coupled to the output of each of the delay means to correlate the samples of the N signals with a reference signal. The output of the correlators are integrated to provide the indication of the time of arrival of the N signals.

US Patent:

47363908, Apr 5, 1988

Filed:

Oct 15, 1986

Appl. No.:

6/919106

Inventors:

Charles R. Ward - Wayne NJ
Ning H. Lu - Parsippany NJ

Assignee:

ITT Avionics, a division of ITT Corporation - Nutley NJ

International Classification:

H03K 902

US Classification:

375 75

Abstract:

There is described a zero IF receiver which affords to reduce offsets normally associated with quadrature mixers employed in such receivers. In order to reduce the effect of such offsets the local oscillator signal is modulated with a balanced pseudo-random phase code signal. This signal is then stripped off by means of additional mixers, one for each of the quadrature channels. The effect of the pseudo-random phase code signal is to spread the spectrum which is associated with the offsets so that the receiver can now respond to desired signals with a minimum of interference.