Diversity Techniques for Airborne Communications in the Presence of Ground Reflection Multipath

Abstract

C-0002AF-649LESDTR-72-216(*microwave communications, *diversity reception), multipath transmission, attenuation, l band, mathematical models, propagation, air-to-air, air-to-surface, airbornefrequencyThe signal power reduction due to multipath fading is an important design consideration in the development of air-air and ground-air communications links at L-band. A first order mathematical model of ground reflection multipath is used to predict the relationship between the depth of fading and environmental parameters such as surface roughness and the terminal positions relative to earth. The model is then used to investigate two techniques for reducing the loss in received signal power: frequency diversity and antenna height diversity. A measurement program to experimentally evaluate the applicability of antenna height diversity is outlined.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1972
Accession Number
AD0752249

Entities

People

  • Henry Berger
  • James E Evans

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Aircrafts
  • Confidence Limits
  • Diffuse Reflection
  • Doppler Effect
  • Electric Fields
  • Electromagnetic Radiation
  • Frequency
  • Frequency Bands
  • Frequency Diversity
  • Fresnel Zones
  • Geometry
  • L Band
  • Mathematical Models
  • Measurement
  • Models
  • Wave Propagation

Fields of Study

  • Engineering

Readers

  • Computational Modeling and Simulation
  • Radio communications and signal processing.