The GEOSAT (GEOdetic SATellite) was a
U.S. Navy Earth observation satellite, launched on
March 12,
1985 into an 800 km, 108-deg inclination orbit, carrying a
radar altimeter capable of measuring the distance from the satellite to sea surface with a relative precision of about 5 cm.After a classified Geodetic Mission (GM) for the Navy, GEOSAT's scientific Exact Repeat Mission (ERM) began on
November 8,
1986 after being maneuvered into a 17.05 day repeat orbit. When the ERM ended in January
1990, due to failure of the two on-board tape recorders, more than three years of ERM data were collected and made available to the scientific community.
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