Automatic Null Steering/Surveillance Array System (ANSAS) for Global Positioning System (GPS) Application

Abstract

Global Positioning System Receivers can be affected by interference from unfriendly jammers. The ANSAS Automatic Null Steering/Surveillance array System for Global Positioning System (GPS) application is an ECM addition for GPS application which reduces GPS performance degradation by generating a spatial null in the antenna pattern in the direction of the interference source. Both automatic and manual modes of operation are available to the operator. ANSAS operates by sensing the interference environment and optimizes S/J ratio via spatial null formation under the guidance of a microprocessor controller. Control signals originating in the microprocessor drive Phase-Amplitude adjustments (Complex Weights) at the antenna elements such that a reduction in interference occurs after the summation of the antenna outputs. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1978
Accession Number
ADA063160

Entities

People

  • Charles M. Desantis
  • Jack Gray
  • Thomas J. Brown

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors
  • Space

DTIC Thesaurus Topics

  • Antenna Arrays
  • Antennas
  • Arrays
  • Beam Steering
  • Circuit Boards
  • Computer Programs
  • Computers
  • Control Systems
  • Detectors
  • Global Positioning Systems
  • Microwave Receivers
  • Phase Shift
  • Phased Arrays
  • Printed Circuit Boards
  • Printed Circuits
  • Radiation
  • Radiation Patterns

Readers

  • Positioning, Navigation, and Timing (PNT) Technology.
  • Radar Systems Engineering.
  • Robotics and Automation.

Technology Areas

  • Space
  • Space - Spacecraft Maneuvers