Start Date
4-1981 8:00 AM
Description
This is an attempt to devise a model to explain the apparent anomalous dispersion in rain of gated MSBLS-GS data received by a NAVSET located at the end of the Orbiter landing runway at KSC. A tutorial presentation of current theory is given. This includes both the phenomenology of a falling water droplet and the classical electromagnetic solutions of Mie (for spheres) and Stevenson-Oguchi (for spheroids).
A simple model is synthesized to bridge the gap between the complex solutions of classical electromagnetic theory and the simple empirical findings e.g., A = kR of Atlas et al . It is shown that the model, while accounting for the A~2 dependence of extinction and the enhanced dispersion in rain, lacks rigor. It is further shown that more rigorous treatments, while also accounting for the X"2 dependence, do not account for enhanced dispersion. Other related propagation characteristics of 15 GHz propagation in rain, such as absorption, scattering, and multipath, are also treated to delineate their possible roles in explaining the apparent anomaly.
15 GHz Electromagnetic Propagation in Rain
This is an attempt to devise a model to explain the apparent anomalous dispersion in rain of gated MSBLS-GS data received by a NAVSET located at the end of the Orbiter landing runway at KSC. A tutorial presentation of current theory is given. This includes both the phenomenology of a falling water droplet and the classical electromagnetic solutions of Mie (for spheres) and Stevenson-Oguchi (for spheroids).
A simple model is synthesized to bridge the gap between the complex solutions of classical electromagnetic theory and the simple empirical findings e.g., A = kR of Atlas et al . It is shown that the model, while accounting for the A~2 dependence of extinction and the enhanced dispersion in rain, lacks rigor. It is further shown that more rigorous treatments, while also accounting for the X"2 dependence, do not account for enhanced dispersion. Other related propagation characteristics of 15 GHz propagation in rain, such as absorption, scattering, and multipath, are also treated to delineate their possible roles in explaining the apparent anomaly.
Comments
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