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The Space Interferometry Mission (SIM) will perform astrometry to a resolution of a few micro arc seconds. The development of this mission is being led by the California Institute of Technology, JPL for the National Aeronautics and Space Administration. A recent trade study was performed to compare two significantly different architectures. This paper will describe the two configurations and contrast some of their differences and similarities.
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Kim M. Aaron, William H. Mateer II, Richard L. Baron, "SIM configuration trades," Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); https://doi.org/10.1117/12.317122