A Review of the History of Field Strength Models in Prophet,
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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Changes in the PROPHET field strength model are reviewed. Until recently, the model was based on that developed by the Deutsche Bundespost Damboldt, 1975. In this model the field strength depends on path distance, the transmitted power, a lower frequency limit fl, and a upper frequency limit fo. The different PROPHET version differ on how fl and fo were formulated. PROPHET implementations of fl and fo are reviewed. The most accurate PROPHET model using the Deutsche Bundespost model is a version called HFTDA. Recently, a new model was developed for paths less than 7000 km which was a significant departure from prior versions and calculates modes propagating via the E-layer as well as by the F-layer. The ionospheric absorption and over-the-MUF loss are estimated as in IONCAP. As this model made a significant improvement in the accuracy of the estimates of field strength, it was incorporated into HFTDA.
- Radiofrequency Wave Propagation
- Atmospheric Physics