Prescribed performance control strategies for halo orbit spacecraft rendezvous

This paper studies finite-time libration point orbit autonomous rendezvous for spacecraft with external disturbances and velocity-free during the terminal phase. The proposed method is essentially a compound control method, which consists of a novel prescribed performance control (NPPC) and integral-chain differentiator observer (ICDO) methodology. The ICDO s used to estimate the unknown relative velocity information between two neighboring spacecraft, while theoretical analysis and rigorous proof show that the relative position and its rate can reach a small compacted region around zero within predefined time. Simulation results of a final closing rendezvous example are provided to demonstrate the effectiveness and robustness of the proposed composite ICDO-NPPC guidance approach.