Consideration of Near Field Effects in Microwave Landing System (MLS) Feasibility Evaluation,

Abstract

The near field MLS beam pattern may be troublesome if C-band flare guidance is used. One of the complications is introduced by defocusing or broadening of the beam received by an aircraft located in the near field of the antenna. With a C-band flare elevation subsystem, the antenna near field will extend a distance from the antenna sufficient to contain the aircraft during flare and touchdown, and so the precise characteristics of the near field signals must be understood. The effects of beam broadening on system accuracy and signal processing requirements are briefly examined, and experimental investigations are recommended. A short discussion of antenna aperture optimization is also presented, and parallels are drawn between Doppler MLS and synthetic aperture radar. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1974
Accession Number
AD0784854

Entities

People

  • H. S. Marsh

Organizations

  • MITRE Corporation

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Aircrafts
  • Antenna Apertures
  • Antennas
  • C Band
  • Elevation
  • Guidance
  • Microwave Landing Systems
  • Microwaves
  • Near Field
  • Optimization
  • Radar
  • Signal Processing
  • Synthetic Aperture Radar

Fields of Study

  • Physics

Readers

  • Cardiovascular Physiology
  • Phased Array Antenna Design.
  • Software Engineering