Statistics of Anomalous Topospheric Propagation at UHF frequencies
Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany
Proceedings: EuCAP 2009
Pages: 3Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Rudd, Richard (Aegis Systems Ltd, 30 Anyards Road, Cobham, Surrey, KT11 2LA, UK)
This paper presents results from a study concerned with the impact of short-term interference due to tropospheric enhancements on UHF services. While annual and monthly path loss statistics have been gathered for long-distance paths over many years, there has been little information available regarding the short-term variability of such interference, or of its correlation between different UHF frequencies. The present study is currently logging such information for a number of mixed paths across the English Channel and North Sea, and results from the first year of records are presented. The opportunity has also been taken to review a number of existing models, from the ITU-R and elsewhere, for the operational prediction of short-term signal enhancements due to tropospheric effects including ducting, and to examine the empirical bases of these models.