Development of a New Field Strength Model for PROPHET
Abstract
A new field strength model was developed for PROPHET which was a significant departure from prior versions. Until recently, the model was based on that developed by the Deutsche Bundespost(Damboldt, T., NATO AGARD Conference Proc.- No. 173,1975). In the new model, the Duetsche Bundespost model was replaced for paths shorter than 7000 km by a model relying on propagation via the regular E-layer and the F2-layer. The routine finds a lower order mode for the E-layer, F2-layer, and a mixed E-layer and F2-layer. Only one E-layer hop is considered in the mixed mode. The MUF model used is the MINIMUF-85 model(Sailors et al., NOSC TR 1121, July 1986). The E-layer MUF is calculated as in IONOCAP. The ionospheric absorption equation is the one used in IONOCAP with the near specular reflection losses calculated for E-layer modes at low frequencies. The over-the-MUF losses are calculated using the Phillips (Wheeler, J.L., Radio Sci. ,1,1303-1308,1966) method for values of frequency/MUF ratio up to about 1.5 MHz depending on ground distance and with values greater being considered in the 'scatter' region. Reprints.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1990
- Accession Number
- ADA217321
Entities
People
- D. B. Sailors
- D. L. Lucas
- J. R. Gnessin