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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (19): 228342-228342.doi: 10.7527/S1000-6893.2022.28342

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles    

Dynamic parameter identification without excitation for non-cooperative targets post soft capture

Sheng XU, Ming CHU(), Shaoqi LIN, Rui CHANG, Hanxu SUN   

  1. School of Modern Post (School of Automation),Beijing University of Posts and Telecommunications,Beijing  100876,China
  • Received:2022-12-01 Revised:2023-02-20 Accepted:2023-05-22 Online:2023-05-26 Published:2023-05-26
  • Contact: Ming CHU E-mail:chuming_bupt@bupt.edu.cn
  • Supported by:
    National Natural Science Foundation of China(51875046)

Abstract:

To address the problem of dynamic parameter identification on orbit for non-cooperative targets, a non-excitation identification method based on the state perception of soft-docking mechanism is proposed. When non-cooperative targets are captured, the compound system is in the phase of buffering and unloading collision impulse, and the soft-docking mechanism is in the state of non-excitation response. Firstly, the kinematics of the main spacecraft equipped with the soft-docking mechanism is analyzed, the momentum equation of the compound system with the dynamics parameters of the non-cooperative targets is established, and then an absolute momentum increment equation of the compound system is constructed. Secondly, aiming at the singularity problem in solving dynamic parameters, a method of continuous dimension increasing of matrix is designed to avoid singularity, and the measurement of the termination condition is completed through solving matrix condition number. Finally, based on the generalized coordinates and generalized velocities of the main spacecraft equipped with soft-docking mechanism through on-orbit perception, the dynamic parameters of the non-cooperative targets can be identified. Numerical simulation results show that the proposed method has the advantages of faster solution, short identification period, small impact on base attitude and high identification accuracy.

Key words: absolute momentum increment, soft capture, non-excitation, non-cooperative targets, singularity avoidance

CLC Number: