2. Preliminary orbit
Three observations are enough to define a Keplerian orbit. This preliminary orbit is used to predict the target's trajectory for re-observation. In this section, we present methods of determination based on positions or directions.
2.1 Position measurement
Once the sensor-target distance has been measured, the target's position relative to the attractor center is known (16) . Three coplanar positions
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Preliminary orbit
Orbit estimation
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