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REX (Radiation Experiment)





United States Air Force satellites designed to study scintillation effects of Earth's atmosphere on radio transmissions. REX 2 was also the first spacecraft to successfully employ GPS (Global Positioning System) navigation for full closed-loop attitude control.


spacecraft launch date launch vehicle launch site orbit mass (kg) size (m)
REX 1 Jun. 29, 1991 Scout G Vandenberg 766 × 869 km × 89.6° 85 0.6 × 0.8
REX 2 Mar. 9, 1996 Pegasus XL Vandenberg 799 × 835 km × 90.0°   0.6 × 0.8


Related category

   • SATELLITES AND SPACE PROBES