Abstract
A complementary experimental and computational study was undertaken to assess the variability due to model sensitivities when predicting propagation in realistic outdoor environments by using a Green’s Function Parabolic Equation (GFPE) method and including realistic weather and terrain profiles. In order to test the validity of the basic and enhanced model including real terrain and weather data, field measurements were conducted at Hogan’s Mountain, North Carolina. By incorporating USGS terrain and measured weather profiles, this project further developed a Hogan’s Mountain specific GFPE to include a stair-step terrain mapping capability and linearly interpolated sound speed profiles. This Hogan’s Mountain GFPE uses matching conditions for comparison to the measured received levels from the field test data. Due to the vast data set acquired, which allows for comparison of the model to measurement in a multitude of propagation situations, several comments are made regarding the choice of calculation parameters as well as the validity of the basic and altered Hogan’s Mountain GFPE for different propagation prediction settings. Sample results will illustrate the agreement based on frequency, specific terrain and weather measured along the propagation path for individual source-receiver pairs of interest. [Work supported by Spawar Systems Center Pacific.]
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