RF Propagation Models

December 10, 2015

SoftWright’s Terrain Analysis Package (TAP) provides RF propagation models, such as Longley-Rice, Bullington, Okumura and Hata-Davidson to measure field strength data. However, these models calculate RF propagation losses over terrain and the accuracy does depend on the quality of the topographical and land use data included in the study. SoftWright now has 1 arcsecond (30 meters) resolution topo data for most of the world. This will replace the 3 arcsecond resolution data that it has been offering outside of North America, which is approximately 90 meters in data step size. Site elevation values are calculated based on interpolating between points on a grid having step size of 90 meters.

For the new data set, the measurements are at 1 arcsecond or 30-meter grid step size. This is nine times greater point density in the topo elevation grid. Whether working in path studies or area coverage studies in steep to undulating terrain, this higher resolution data set will improve the accuracy of study results. www.softwright.com