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Article | REF: TRP4053 V1

Space Trajectories. Orbit Determination

Author: Max CERF

Publication date: December 10, 2020, Review date: September 21, 2021

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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 r→1,r→2,

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