Garret E Murdza

US Patent:

7548187, Jun 16, 2009

Filed:

Nov 8, 2006

Appl. No.:

11/594419

Inventors:

Gregory S. Laste - Hudson NH, US
Garret E. Murdza - Nashua NH, US

Assignee:

BAE Systems Information and Electronic Systems Integration Inc. - Nashua NH

International Classification:

G01S 13/00
G01S 13/50

US Classification:

342159, 342104, 342109, 342195

Abstract:

In an aircraft-mounted Doppler radar clutter rejection system, a flexible, sharp band pass filter uses Taylor weighting, an FFT and a module for selecting which of the Doppler cells are to be activated, thus to control the band pass characteristic and set the clutter line to the speed of the aircraft.

US Patent:

51032325, Apr 7, 1992

Filed:

Apr 18, 1991

Appl. No.:

7/687267

Inventors:

Kaichiang Chang - Northborough MA
Garret E. Murdza - Boxborough MA
Fernando Beltran - Framingham MA
Robert D. Foltz - Wayland MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01Q 322

US Classification:

342372

Abstract:

An improved means of decorrelating phase quantization errors in a phased array radar antenna using digital randomization at each of the array elements to reduce peak steering erorrs and to reduce peak sidelobe levels of the antenna. A random phase adjust term is provided to each of the array's antenna elements which comprises a distributed controller (DC) co-located with a digital phase shifter. The distributed controllers are each programmed with a random phase adjust term which represents a phase shift adjustment statistically independent from element to element. The random phase adjust term is stored in a memory located in each disbtributed controller. The distributed controller drives each element's digitally controlled phase shifter in response to a beam steering command received over a serial line. The performance improvement achieved with this decorrelation method is equivalent to that obtained by using more expensive phase shifters and adding costly randomized cables in the path to each element.