A NEW APPROACH TO THE EVALUATION OF HF AIRCRAFT ANTENNAS
Abstract
A method is described for obtaining a factor of merit for an airborne HF transmitting system, taking into account the transmitter power and the variations in antenna gain with respect to azimuth, elevation, and frequency, in cases where the principal mode of propagation is the one involving reflections from the F-layer of the ionosphere. A set of special numerical tables is employed, based on calculations of elevation angle, optimum frequency, propagation loss, and receiver-site noise for more than 50,000 postulated communication events having various path lengths, directions, locations, and times of occurrence. For a given value of transmitter power and a given antenna-gain pattern, the tables indicate the number of successful communication events expected for each of many combinations of azimuth, elevation, and frequency. The factor of merit is defined as the ratio of the total number of successful events to the total number of events postulated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1961
- Accession Number
- AD0257079
Entities
People
- J.f. Cline
Organizations
- SRI International