Apr 4 1983
From The Space Library
For the first time in the U.S. space program, one satellite used signals from another satellite to navigate. The Air Force System Command said that Landsat D (Landsat 4), a NASA remote-sensing craft built by General Electric, was getting signals from the U.S. Air Force Space Division's NavStar global-positioning system (GPS) satellite to compute position, velocity., and time. Landsat 4, first satellite to carry a GPS receiver, could record its precise position as it acquired Earth-imaging data. The receiver also eliminated transmission of navigation signals between space and Earth; direct signal reception ensured efficient and economic spacecraft operation. (AFSC Newsreview, Apr 4/83, 5)
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