Abstract
Abstract : LONG TERM GOALS: Develop electromagnetic propagation models, that perform equally well over land and sea and in the presence of anomalous propagation conditions for both surface and airborne emitters, for use in operational or engineering propagation assessment systems. OBJECTIVES: Develop an advanced unified hybrid radio propagation model based on parabolic equation and ray-optics methods for both surface-based and airborne applications. This model is named the Advanced Propagation Model (APM) and is the model used in the Advanced Refractive Effects Prediction System (AREPS). Other objectives are to develop a propagation model for earth-satellite geometries suitable for inclusion into the Advanced Propagation Model (APM) or alternately, suitable for transition to the Advanced Refractive Effects Prediction System (AREPS) and the Naval Integrated Tactical Environmental Subsystem (NITES) II. As part of this development effort, an enhanced absorption model will be updated and rain attenuation models will be included within APM and the earth-to-satellite model (ESPM). We will also perform a sensitivity study of the structure parameter using the Rough Evaporation Duct (RED) measurements. As a result of this study we will develop a suitable algorithm within APM accounting for turbulent effects in the marine boundary layer, providing a variance of the predicted instantaneous field strength.
Published Version
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