One of the most promising mission concepts for imaging and characterizing Earth-like planets about other stars is a telescope/starshade system. But, in order to maximize the number of targets accessible for a given mission formation-keeping strategies are required. This paper details the design and implementation of a formation ying hardware-in-the-loop simulation in the existing Princeton Starshade Testbed to validate formation sensing and control algorithms while maintaining high contrast with a ight-like starshade. We present initial experimental results to help advance the starshade technology gap of formation sensing and control.
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