Accession Number : ADP002740

Title :   A Long Range Propagation Experiment to Investigate the Incidence of Anomalous Propagation in the North Atlantic,


Personal Author(s) : Rider,G. C. ; Clarke,J.

Report Date : AUG 1983

Pagination or Media Count : 12

Abstract : The significance of enhanced range on air to ground paths is reviewed and the paper describes an experiment to collect maximum range data on an oversea path. A Secondary Surveillance Radar sited in the Hebrides was used to observe civil air traffic crossing the North Atlantic, and a cumulative distribution of range extending to 0.1% of the year is presented as a result of 14 months of observation. The modifications made to the radar antenna and display in order to provide sufficient system sensitivity, are described. About 99% of the observations are shown to be satisfactorily modelled by employing an exponential atmosphere with linear N profiles as measured by a suitably sited radio-sonde station, Ocean Weather Ship 'L', to model the first 1 Km. of height.

Descriptors :   *Search radar, *Propagation, *Marine meteorology, North Atlantic Ocean, Stations, Air to surface, Civil aviation, Radar antennas, Sensitivity, Ground level, Radar targets, Radiosondes, Ships, Air traffic, Profiles, Paths, Secondary, Crossings

Distribution Statement : APPROVED FOR PUBLIC RELEASE