The geostationary Gorizont satellites are part of the Russian YeSSS Unified Satellite Communication System. These satellites provided civilian and military telephone, telegraph, and facsimile communications services, in addition to relaying TV and radio broadcasts. Gorizont also supported maritime and international communications from 1988 as an element of the Okean system operating at 1.5 to 1.6 GHz. The Gorizont system occupies 10 position on the geostationary orbit.
Geostationary OrbitMSTI 2 (Miniature Sensor Technology Integration 2) was a US Department of Defense spacecraft launched from the Vandenberg AFB by a Scout-G1 rocket. It was the last of the now discontinued Scout series. The primary mission of MSTI 2 was to demonstrate theater ballistic missile (TBM) tracking and was intended to last for six months. It successfully spotted and locked onto a test Minuteman-3 launched from Vandenberg AFB. More than three million short wavelength infrared (SWIR) and medium wavelength infrared (MWIR) image frames were obtained during the mission.
Low Earth OrbitTrumpet signal intelligence satellites were launched by Titan-4(01)A Centaur-T into highly elliptic Molniya-type orbits. In their elliptical orbits they would move very slowly over the northern hemisphere for most of their orbital period, allowing interception of microwave line-of-sight communications beams. Since they would move slowly through the beams during their orbit, a constellation of such satellites was required to monitor Soviet communications throughout the day.
Elliptical Orbit