International Space Network interoperability results and status

In 1986, NASA, ESA, and NASDA instituted the Space Network Interoperability Panel (SNIP) to coordinate the activities of these three national agencies during the exploratory phase of new space communications systems' development. To date, the deliberations of SNIP have led to (1) ESA's changing of its European Data Relay Satellite's S-band center frequency from fixed to tunable, (2) NASDA's changing of two comsats' Ka-band return link frequency from 32 GHz to the 26 GHz standard adopted by ESA, and (3) NASA's adoption of the Ka-band, in addition to the Ku-band, as the high data rate interorbital link of the ATDRS. A tabulation of interoperability considerations for the three space agencies is presented.