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

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 distr...

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Bibliographic Details
Main Authors: Rider,G. C, Clarke,J
Format: Report
Language:English
Subjects:
Air to surface
Air traffic
Anomalous propagation
Civil aviation
Component Reports
Crossings
Elevated layers
Ground level
Marine meteorology
North Atlantic Ocean
Oversea paths
Paths
Profiles
Propagation
Radar antennas
Radar targets
Radiosondes
Search radar
Secondary
Sensitivity
Ships
Stations
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Summary: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. This article is from 'Propagation Factors Affecting Remote Sensing by Radio Waves,' AD-A137 559, p29-1-29-12.