Optimal maneuvering strategy of spacecraft evasion based on angles-only measurement and observability analysis

Spacecraft orbit evasion is an effective method to ensure space safety. In the spacecraft's orbital plane, non-cooperate target with autonomous approaching spacecraft may have a dangerous rendezvous. To deal this problem, optimal maneuvering strategy based on relative navigation observability degree proposed angles-only measurements. A maneuver model in plane constructed and measurement criteria process noise are defined posterior Cramer-Rao lower bound. Further, proposed. The provides new idea for evade safety threats autonomously. Compared problem absolute navigation, more accurate results can be obtained. simulation indicates that weaken system's reduce state estimation accuracy of non-cooperative target, making it impossible accurately approach spacecraft.