Abstract
Future missions to asteroids and comets will likely encounter bodies which are tumbling (i.e., not in principal axis rotation), and which have poor or non-existent prior shape models. In this work, simulated images of a tumbling comet are processed by a sequential Extended Kalman Filter (EKF) Simultaneous Localization and Map** (SLAM) method and a novel approach is employed to generate initial landmark positions without a detailed shape model. The a priori landmark position method uses a subset of manually identified surface landmarks, and the full set of landmark observations are then employed by the EKF SLAM to estimate the small body spin state and scaled moments of inertia; the spacecraft position and velocity (the spacecraft attitude is provided by an independent attitude determination system); and the final surface landmark locations. An interpolation method for the provided spacecraft attitude values is also provided. The initial landmark generation and SLAM method is successful in estimating the spin state of the simulated body, with final smoothed error magnitudes lower than 1 degree for the small body orientation and 2 degrees per day for the small body angular velocity.
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Acknowledgements
The work described in this paper was funded by NASA’s Chief Technology Office through a NASA Space Technology Research Fellowship. The authors would like to acknowledge the Rosetta Flight Dynamics team at ESOC for providing the simulated images and scenario used for our analysis. The authors also thank the organizers of the 1st Annual RPI Workshop on Image-Based Modeling and Navigation for Space Applications. On behalf of all authors, the corresponding author states that there is no conflict of interest.
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Olson, C., Russell, R.P. & Bhaskaran, S. Tumbling Small Body Spin State Estimation Using Independently Simulated Images. J Astronaut Sci 69, 51–76 (2022). https://doi.org/10.1007/s40295-022-00312-4
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DOI: https://doi.org/10.1007/s40295-022-00312-4