Weather Satellite and Computer Modeling Approaches to Assessing Propagation Over Marine Environments,
PACIFIC MISSILE TEST CENTER POINT MUGU CA
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Exploiting electromagnetic propagation in the Navys marine environment requires an ability to assess and predict atmospheric refractive structure over the ocean. Efforts have been underway to develop such capabilities by correlating duct existence, height and intensity to synoptic and mesoscale weather features. In addition to the latter conventional parameters, meteorological satellite data, through pattern recognition has been valuable in inferring important aspects of ducting conditions. More recently, a technique was developed to derive duct height information directly from computer-processed infrared IR satellite data over ocean regions capped by stratified low clouds. This approach, still in development, also provides a means of measuring the horizontal variability of duct height which is crucial to determining the appropriateness and useability of various propagation models for predicting systems performance. Inferring the impact of horizontal variability over the ocean has been facilitated by use of range-dependent raytrace techniques which allow inputs from such diverse sources as local radiosonde observations predicted marine layer depth from a mixed-layer mesoscale model and duct heights derived from the satellite-IR duct technique.
- Radiofrequency Wave Propagation