Accession Number:

ADA170537

Title:

A Simple Adaptive Nulling Technique Using Phase-Only Control

Descriptive Note:

Corporate Author:

ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY

Report Date:

1985-03-01

Pagination or Media Count:

27.0

Abstract:

This report describes a simple adaptive method to form nulls in the radiation pattern of large phased array antennas using phase-only control. The beam-steering phase shifters are perturbed in a manner that forms cancellation beams in the desired null directions. Each cancellation beam is shown to have a complex amplitude coefficient that can be determined from a series of five measurements of the total array output power one reference measurement with no phase perturbation and four measurements with a cancellation beam formed in the desired null direction. These beams have the same amplitude and the phase is varied in 90 deg increments. The results presented are from a numerical simulation of an 80-element array.

Subject Categories:

  • Electrical and Electronic Equipment
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE