Accession Number:

AD0752249

Title:

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

Descriptive Note:

Technical note

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

Report Date:

1972-09-01

Pagination or Media Count:

149.0

Abstract:

C-0002AF-649LESDTR-72-216microwave 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.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE