One of the preferred embodiments of the present invention is a telecommunications system that includes twelve satellites (S) which are equally deployed in four polar low Earth orbits (OR). A preferred embodiment provides a system for transmitting a message between two terminals (G) on the ground through...http://www.google.es/patents/US5666648?utm_source=gb-gplus-sharePatente US5666648 - Polar relay system for satellite communication
