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

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Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History

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