Accession Number:

AD0747022

Title:

On the Reduction of Rainfall Outages by Space Diversity for Millimeter-Wave Earth-Satellite Communications Systems.

Descriptive Note:

Rept. for Jul 71-Jan 72,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s):

Report Date:

1972-04-15

Pagination or Media Count:

34.0

Abstract:

Space diversity, i.e., judicious placement of several ground terminals within a predetermined area, is examined as a means of avoiding rainfall-induced blackouts of millimeter-wave earth-satellite communications systems. The concept of space diversity implemented by a primary station and four secondary stations within an 80-km radius is examined on the basis of hourly rainfall data for the 10-yr period from 1 January 1961 to 31 December 1970. The hours of selected categories of rainfall occurring simultaneously at each station are determined for three climatologically different regions of the United States. The hours of simultaneous rainfall occurring at the three widely separated primary stations are also determined. Results show that a spacediversity system with five stations in an 80-km radius will have at least one station free of rainfall at rates of 5 mmhr 99.99 of the time. Author

Subject Categories:

  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE