The IGS Radar 1 & Optical 1 (Intelligence Gathering Satellite) are Japanese radar and optical reconnaissance satellites. The satellites are operated by the Cabinet Satellite Information Center. The satellites serve both Japan's national defense and civil natural disaster monitoring.
Sun-Synchronous OrbitThe U.S. Air Force Space Command operates 10 Phase III DSCS satellites providing defense officials and battlefield commanders secure voice and high rate data communications. The DSCS III system also transmits space operations and early warning data to various systems and users.
Geostationary Transfer Orbit