Systems Engineering and Electronics ›› 2023, Vol. 45 ›› Issue (1): 175-183.doi: 10.12305/j.issn.1001-506X.2023.01.21

• Guidance, Navigation and Control • Previous Articles    

Fractional order sliding mode guidance law based on robust exact differentiator

Haoran LU1,2,*, Wei ZHENG1, Xiaohua CHANG2   

  1. 1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
    2. Beijing Institute of Space System Engineering, Beijing 100076, China
  • Received:2021-08-07 Online:2023-01-01 Published:2023-01-03
  • Contact: Haoran LU

Abstract:

A fractional order terminal sliding mode guidance law with finite time convergence is proposed for maneuvering target interception with impact angle constraint. Firstly, the relative motion model of missile and target in two-dimensional plane is established. Secondly, the fractional order sliding surface and fractional order reaching law are selected respectively to design the fractional order terminal sliding mode guidance law, and the finite time stability of the guidance system is proved. At the same time, for the target maneuvering information acquisition, a target maneuvering acceleration estimation method based on robust precise differentiator is proposed to compensate the guidance law. Finally, the simulation results are compared with relevant guidance laws, the simulation results show that the proposed fractional order terminal sliding mode guidance law has a higher guidance accuracy and can effectively suppress sliding mode chattering.

Key words: differentiator, fractional calculus, sliding mode control, guidance law, finite time

CLC Number: 

[an error occurred while processing this directive]