The U.S. Navy began replacing and upgrading its ultra-high frequency (UHF) satellite communications network during the 1990s with a constellation of customized satellites built by Hughes Space and Communications Company. Known as the UFO (Ultra High Frequency Follow On) series, these HS-601 model satellites support the Navy's global communications network, serving ships at sea and a variety of other U.S. military fixed and mobile terminals.
Geostationary OrbitThe objective of the ASCA (Advanced Satellite for Cosmology and Astronomy) (or Astro D) mission was to perform spectroscopic X-Ray astronomy in the wavelength band 1--12 keV. with particular emphasis on spectroscopy of the iron K band.
Low Earth Orbit