GBS data mapper: modeling worldwide availability of Ka-band links using ITU weather data

In support of SPAWAR PMW 176 (Navy SATCOM Program Office), we have developed GDM, the Global Broadcast Service (GBS) data mapper. GDM is comprised of a raster-based modeling core, a simple geographic display tool, a comprehensive set of ITU-based weather and RF propagation models, and a substantial set of weather and mapping databases. The model develops expected link margins for Ka-band GBS terminals worldwide, under annual or seasonal weather conditions including attenuation due to rain, clouds, and water vapor. The mapper renders these margins, as well as the supporting model data, affording rapid assessment of GBS availability in conditions and locations of interest to the Navy (or any other user of Ka-band SATCOM), as well as insight into the probabilistic nature of link availability in real-world conditions.