Warren B Guthrie, 52Aurora, IL

5959584, Sep 28, 1999

Apr 18, 1997

8/844426

Kenneth Duane Gorham - Palatine IL
Warren E. Guthrie - Wheaton IL
Roger Brunner Williams - Lake Zurich IL

Northrop Grumman Corporation - Los Angeles CA

H01Q 132

343711

A vehicle having a plurality of antennas each in association with a communications transmitter device disposed within the vehicle to thereby provide multiple signal transmission sites. At least one antenna is disposed substantially at a top site of the vehicle and at least one antenna is disposed substantially at a bottom site of the vehicle, thus providing antenna coverage irrespective of the spatial orientation of the vehicle. The invention includes a communications system employing a multiplicity of antenna sites as well as methodology for providing a communication link from a vehicle to a receiving site by incorporating the communications system. In this manner, vehicle occupants are provided with a communications link from the vehicle, irrespective of the position of the vehicle. Thus, if one antenna is shielded from transmission because it is situated at a top site of a vehicle and the vehicle is upside down because of a mishap, another antenna which is situated to be operable from a non-shielded site (e. g. a bottom site of the vehicle) will provide effective signal transmission.

5910956, Jun 8, 1999

Nov 5, 1996

8/743943

Warren E. Guthrie - Glen Ellyn IL
Michael J. Trainor - Palatine IL

Northrop Gruman Corporation - Los Angeles CA

H04L 2413

370445

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.

5844942, Dec 1, 1998

Feb 27, 1997

8/807299

Randall G. Hicks - Elmhurst IL
Warren E. Guthrie - Wheaton IL
James T. Wesley - Hoffman Estates IL

Northrop Grumman Corporation - Los Angeles CA

H03K 704
H03K 904

375239

A method for modulating a radio signal has the steps of: predetermining a first time interval so as to define a data word; generating a synchronization pulse, the synchronization pulse initiating a single data word having a length of the predetermined first time interval; and generating a single data pulse within the data word after a second time interval with respect to the synchronization pulse, the length of the second time interval defining at least one character. Defining at least one character by a single data pulse after a second time interval with respect to the synchronization pulse enhances an energy efficiency of the transmitted radio signal while mitigating a duty cycle thereof.

5451910, Sep 19, 1995

Aug 12, 1993

8/106154

Warren E. Guthrie - Glen Ellyn IL

Northrop Grumman Corporation - Los Angeles CA

H03L 7081

331 16

A frequency synthesizer has the configuration of a phase locked loop (PLL) having a voltage controlled oscillator (VCO) generating an output signal, a phase detector for outputting a control signal to the VCO, and circuitry coupled to an output port the VCO for offsetting the frequency of a sample of the output signal. The synthesizer includes a sampling mixer operative with a source of reference signal and interconnecting the offset circuitry with the phase detector. The sampling mixer mixes the offset sample with the reference signal to output a comb frequency spectrum of signals differing in frequency from each other by multiples of the reference frequency. A filter selects a signal outputted by the sampling mixer at one of the comb frequencies for application to the phase detector. The phase detector is operative with a source of input signal having an input signal frequency for phase locking with the signal selected by the filter. The PLL includes a stabilizing loop filter circuit preceding the VCO and having means for adjusting a value of the control signal to tune the frequency of the output signal.

5729235, Mar 17, 1998

Dec 13, 1995

8/571815

Warren E. Guthrie - Glen Ellyn IL
Robert Rozak - Evanston IL
Thomas E. Szmurlo - Palatine IL

Northrop Grumman Corporation - Los Angeles CA

G01S 502

342357

A translator for translating GPS signals received at one location to a different frequency for ground transmission to another location uses a spread spectrum pilot tone for phase-locking the local oscillator of the ground transmitter to that of the ground receiver, thereby increasing security, enabling use of otherwise unavailable frequency spectra, allowing coherence of pilot tone and GPS signal with small coherence bandwidths, and allowing interference-free transmission of the translated GPS signal and pilot tone with the same center frequency.

5193210, Mar 9, 1993

Jul 29, 1991

7/737256

Michael G. Nicholas - Hawthorn Woods IL
Warren Guthrie - Glen Ellyn IL

ABC Auto Alarms, Inc. - Elk Grove Village IL

H04B 700

455 381

A low powered RF receiver for receiving a modulated carrier having a coded transmission so as to remotely control a number of vehicular devices includes an antenna, a preamp stage, mixer, local oscillator, first and second IF bandpass filters, first and second IF amplifiers, a received signal strength indicator/detector circuit, and an adaptive threshold/filter circuitry. The signal strength indicator/detector circuit is interconnected between the first and second IF amplifiers and generates a strength indicator signal which is proportional to the strength of the modulated carrier signal received. The adaptive threshold/filter circuitry is responsive to the strength indicator signal and has a varied threshold reference level for eliminating noise and for converting the strength indicator signal to a logical level. A microcontroller is provided for further signal processing, decoding, and executing the function corresponding to the vehicular device to be controlled.

5872455, Feb 16, 1999

May 16, 1997

8/857606

Walter Jerry Pohribnij - Palatine IL
Warren E. Guthrie - Wheaton IL
Michael J. Trainor - Palatine IL

Northrop Grumman Corporation - Los Angeles CA

G01R 3102
G08B 2100
H05F 302

324509

Improved electronic circuitry incorporated into a tag attached to a user worn wrist strap of a static electrical discharge dissipation system. The electronic circuitry monitors the electrical connection of the wrist strap from the user to ground and tests the functionality of the tag. The electronic circuitry comprises an oscillator, a signal transmitter, a discharge resistor and a discharge resistor check circuit for monitoring the accuracy of the discharge resistor. The electronic circuitry also comprises a skin resistance check circuit for monitoring the electrical connection of the wrist strap to the user, and a ground fault detect circuit for monitoring the electrical connection of the wrist strap to ground. The electronic circuitry further comprises a testing circuit for checking the frequency of the oscillator, monitoring the spectrum of a signal transmitted by the signal transmitter, checking the functionality of the ground fault detect circuit, checking low and high limits of the discharge resistor, and checking the functionality of the skin resistance check circuit.

5748047, May 5, 1998

Aug 15, 1996

8/689874

Warren E. Guthrie - Wheaton IL
Gary S. Garbe - Schaumburg IL

Northrop Grumman Corporation - Los Angeles CA

H03L 102
H03L 700
H03L 716
H04B 126

331 19

A microwave frequency generator and method of generating a predetermined microwave signal. The invention comprises oscillator means to generate a determinable frequency signal and means responsive to the frequency signal received from the oscillator means to generate a predetermined Intermediate Frequency (IF) signal. The invention further includes means to generate a determinable ultrahigh frequency (UHF) signal, along with means responsive to the IF signal and to a UHF signal to generate a resultant frequency signal. Means responsive to the resultant frequency and to the predetermined frequency signal generated by the oscillator means are further provided to generate the desired predetermined microwave frequency signal.