Jerry Thomas Holmes

US Patent:

61413712, Oct 31, 2000

Filed:

Dec 4, 1997

Appl. No.:

8/985345

Inventors:

Jerry D. Holmes - Plano TX
Kenneth S. Barron - Plano TX
Anthony Reid - Plano TX

Assignee:

Raytheon Company - Lexington MA

International Classification:

H04B 1500

US Classification:

375130

Abstract:

A jamming suppression system which includes a plurality of receivers for receiving electromagnetic radiations and a separate notch filter coupled to each receiver for filtering selected frequencies from electromagnetic radiations received by each of the receivers. In accordance with one embodiment of the invention, a spatial combiner responsive to the outputs of each of the notch filters extracts essentially jam-free information from the electromagnetic radiations. In accordance with a second embodiment of the invention, a plurality of spatial combiners, each responsive to the outputs of each of the notch filters, extracts essentially jam-free information from the electromagnetic radiations. The notch filters are adaptive notch filters for on-line selection of their filtering action. One of the notch filters is a master filter and the remainder of the notch filters are slave filters controlled by the master filter.

US Patent:

59866055, Nov 16, 1999

Filed:

Apr 6, 1998

Appl. No.:

9/056070

Inventors:

Leslie A. Priebe - Plano TX
Jerry D. Holmes - Plano TX

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01S 502

US Classification:

342427

Abstract:

A system and method for estimating azimuth angle, elevation angle and signal detection and which includes an antenna system having a plurality of elements, each element receiving a different concurrent portion of an incoming analog signal having a real and an imaginary portion. A converter is provided for each antenna element for converting each analog signal to digital form. A processor is provide for multiplying the sum of the real parts of the signals from a first group of the elements with the conjugate of the sum of the remainder of the elements to provided an estimated azimuth, elevation of signal detection measurement. In the case of a four element antenna, AzEst=Angle((A+B)*(C+D)Conjugate))=(x. sub. A +iy. sub. A +x. sub. B +iy. sub. B)*(x. sub. C -iy. sub. C +x. sub. D -iy. sub. D), ElEst=Angle((A+D)*(B+C)Conjugate))=(x. sub. A +iy. sub. A +x. sub. D +iy. sub. D)*(x. sub. B -iy. sub. B +x. sub. C -iy. sub. C) and Magnitude ((A+B*(C+D)Conjugate)) or Magnitude ((A+D*(B+C)Conjugate)).

US Patent:

58183710, Oct 6, 1998

Filed:

Dec 12, 1996

Appl. No.:

8/764828

Inventors:

Chyi Haw Lu - Plano TX
Jerry D. Holmes - Plano TX
Hugh L. Scott - Breckenridge CO

Assignee:

Raytheon TI Systems Inc. - Lewisville TX

International Classification:

G01S 1300

US Classification:

341122

Abstract:

A method and system for synchronization of pulse groups without a synchronization signal which comprises selecting a plurality of equal time length coherent processing intervals from a stream of data in the time domain, generally analog data. The data in each of the coherent processing intervals is sampled during each of N equal pulse repetition intervals to provide samples of data, each sampling taking place for an equal portion of the pulse repetition interval. Each of the samples of data is identified according to the position thereof in the associated coherent processing interval. The time domain data is converted to frequency domain data on the basis of the position of the time domain data in the coherent processing interval, all of the samples with the same position in a different coherent processing interval being separately collectively converted. The frequency domain data is then compensated for phase rotation by determining the length of the coherent processing interval, the length of the pulse repetition interval and the duration of the sampling and altering the phase of the frequency domain data in response thereto. An FFT is provided of selected ones of the frequency domain data.