Implementation of orbit constellations for Satellite Distress and Safety Systems (SDSS) of Cospas-Sarsat network

In this paper is described implementation of different orbit constellation, such as Polar Earth Orbits (PEO), Medium Earth Orbit (MEO) and Geostationary Earth Orbit (GEO) in function of the Satellite Distress and Safety Systems (SDSS) of Cospas-Sarsat networks for all mobile applications. The panel of International Maritime Organization (IMO) together with Inmarsat mobile satellite operator provided technical and economical studies regarding the extension of the GEO satellite system and to cover Polar Regions. This initiative was performed by international Cospas-Sarsat in designing LEO-polar constellation for full Earth coverage. Some important features of a constellation are introduced such as type of polar and other satellites orbits needed for continues coverage in function of combined distress and safety communication solutions for all Mobile Earth Stations (MES) at sea, on the ground and in the air.