Two satellite communications systems can use the same frequency or frequencies in geographically overlapping footprints, without creating undue interference in a given system that is caused by the same frequency signal(s) that is/are used by the other system. In particular, an aggregate Effective Isotropic...http://www.google.com/patents/US7113743?utm_source=gb-gplus-sharePatent US7113743 - Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint
