Jennifer King, Matthew Ruschmann, George Davis, Emergent Space Technologies, Inc.

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To prepare for various upcoming flight demonstrations of autonomous multi-satellite systems technology, Emergent Space Technologies performed a validation of its multi-satellite navigation filter, NAV, using real GPS data and precise post-processed orbits. NAV estimated positions and velocities were compared to precise orbit ephemerides (POEs) from NASA missions Ice, Cloud, Land, and Elevation Satellite (ICESat) and Gravitational Recovery and Climate Experiment (GRACE). This paper summarizes the methods used to validate NAV’s extended Kalman Filter (EKF) using real GPS data and high precision POEs to improve filter performance. Using this validation method, absolute NAV position errors are determined to have an RMS of less than 10 meters (1sigma) and velocity errors to less than 2.0 cm/s (1sigma) for the analyzed data sets.