Accession Number:

AD0463140

Title:

OPTIMIZATION OF FREQUENCIES FOR LOW-ALTITUDE SPACE COMMUNICATION,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1964-12-01

Pagination or Media Count:

24.0

Abstract:

A simple technique is presented for obtaining the optimum frequencies for communication with a low-altitude satellite, no higher than 800 nautical miles. The output signal-to-noise ratio at the receiving station is expressed in terms of as many parameters as possible with their respective frequency dependence. The optimum frequency is obtained by a maximization process. In cases where the exact frequency behavior of the process is too complex, an approximate analytical expression is used. The parameters considered in this investigation are the spatial electromagnetic path loss, the atmospheric absorption, the galactic noise temperature, the Faraday rotation effect, the antenna noise temperature, the receiver noise temperature, and the conversion efficiency of dc to rf power. The method yields optimum frequencies for the space-to-ground and the ground-to-space communication. For space-to-space communication the optimum frequency is selected from practical limitations. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE