On Rainfall and Space Diversity for Millimeter-Wave Earth-Satellite Communications Systems

E. E. Reber The Aerospace Corporation, Los Angeles, Calif. 90045

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D. V. McDonald Sixth Weather Wing, U.S. Air Force

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Abstract

Space diversity, i.e., the use of several widely spaced terminals, is examined as a means of reducing the probability of simultaneous rainfall in millimeter-wave earth-satellite communications systems. The concept of space diversity, both as a function of the distance between terminals and the number of terminals, is examined on the basis of hourly rainfall data for the 10-year period from 1 January 1961 through 31 December 1970. The probabilities of simultaneous rainfall occurring in a space diversity system are shown to be a systematic function of the spacing and number of terminals in the system.

Abstract

Space diversity, i.e., the use of several widely spaced terminals, is examined as a means of reducing the probability of simultaneous rainfall in millimeter-wave earth-satellite communications systems. The concept of space diversity, both as a function of the distance between terminals and the number of terminals, is examined on the basis of hourly rainfall data for the 10-year period from 1 January 1961 through 31 December 1970. The probabilities of simultaneous rainfall occurring in a space diversity system are shown to be a systematic function of the spacing and number of terminals in the system.

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