Timothy M Stephens

US Patent:

54123909, May 2, 1995

Filed:

Aug 24, 1993

Appl. No.:

8/110884

Inventors:

David L. Peavey - Fremont CA
Katherine A. Tieszen - Cupertino CA
Kristina Pagnini - Fremont CA
Fred E. Schader - San Jose CA
Timothy D. Stephens - Milpitas CA
Nicholas Cianos - Menlo Park CA
John R. Conkle - Los Gatos CA

Assignee:

Delfin Systems - Santa Clara CA

International Classification:

G01S 502

US Classification:

342417

Abstract:

A system for reducing co-channel interference includes a power spectrum analyzer which provides a spectral signal representative of an intermediate frequency signal from the receiver of a direction finding system. The system further includes threshold/window logic that, responsive to the comparison of threshold levels and spectral windows to the interfering signals, will provide stop and continue signals to an integrator. The integrator receives signals from the direction finding system and stops and starts integration of the output signal responsive to the threshold logic. In so doing, co-channel interference is substantially reduced.

US Patent:

54264383, Jun 20, 1995

Filed:

Dec 30, 1992

Appl. No.:

7/998391

Inventors:

David L. Peavey - Fremont CA
Katherine A. Tieszen - Cupertino CA
Timothy D. Stephens - Milpitas CA
Fred E. Schader - San Jose CA
Nicholas Cianos - Menlo Park CA
John R. Conkle - Los Gatos CA

Assignee:

Delfin Systems - Santa Clara CA

International Classification:

G01S 504

US Classification:

342433

Abstract:

A system and method for obtaining the bearing angle of radio frequency is utilized in a direction finding system to determine the signal of interest. The system utilized an adaptive interferometric processor to null out modulation occurring due to commutation between the antenna elements. Through this system the bearing angle can be determined accurately and efficiently.