Accession Number : AD0654924

Title :   INTERFERENCE PREDICTIONS FOR VHF/UHF AIR NAVIGATION AIDS.

Descriptive Note : Technical rept.,

Corporate Author : INSTITUTES FOR ENVIRONMENTAL RESEARCH BOULDER COLO

Personal Author(s) : Gierhart,G. D. ; Johnson,M. E.

Report Date : MAR 1967

Pagination or Media Count : 145

Abstract : Desired-to-undesired signal ratio predictions for the VHF Omnirange (VOR), Tactical Air Navigation (TACAN) and Instrument Landing Systems (ILS) air navigation aids are presented in this report. The parameters involved in the various systems are given first. Next propagation mechanisms applicable to the VHF and UHF bands are discussed together with the calculation of transmission loss and its variability. Third, the statistical nature of the desired-to-undesired signal ratio predictions is explained. Finally, the results of the study are presented in graphical form. Aircraft altitudes from 500 to 100,000 feet along with station separations from 20 to 695 nautical miles are considered. Detailed procedures, mathematical formulas, and computer programs used are discussed in the Appendices. (Author)

Descriptors :   (*RADIO NAVIGATION, RADIOFREQUENCY INTERFERENCE), RADIO EQUIPMENT, COMPATIBILITY, PREDICTIONS, NAVIGATIONAL AIDS, VERY HIGH FREQUENCY, ULTRAHIGH FREQUENCY, RADIO TRANSMISSION, AIR, RELIABILITY, RADIO WAVES

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE