Accession Number : ADD014613

Title :   Adaptive Phase-Shifter Nulling Techniques for Large-Aperture Phased Arrays.

Descriptive Note : Patent, Filed 22 Dec 88, patented 26 Jun 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gabriel, William F ; Cheston, Theodore C

Report Date : 26 Jun 1990

Pagination or Media Count : 21

Abstract : A method of nulling out interference sources in a large aperture phased array radar system is described. The system has apriori knowledge of the interference sources and depends upon access of the array element phase shifters for injection of phase only or phase and amplitude perturbations, of a mainbeam aperture distribution, into said array element phase shifters. The phase or phase amplitude perturbations are derived from an aperture ripple modulation algorithm. The system does not require any auxiliary elements or correlators or beamformers. A method of nulling out interference sources in a monopulse large-aperture phased array radar system is also described wherein the phase and amplitude perturbations are injected into both the sum and difference beams. Patents. (rh)

Descriptors :   *APERTURES, *PATENTS, *PHASE SHIFT CIRCUITS, *PHASED ARRAYS, ADAPTIVE SYSTEMS, AMPLITUDE, ARRAYS, AUXILIARY, BEAM FORMING, CORRELATORS, INTERFERENCE, NULLS(AMPLITUDE), PERTURBATIONS, SOURCES

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE