Fixed-time convergent guidance law considering autopilot dynamics

ZHANG Kuanqiao; YANG Suochang; LI Baochen; LIU Chang

doi:10.7527/S1000-6893.2019.23227

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 11: 323227 - 323227

DOI: https://doi.org/10.7527/S1000-6893.2019.23227

Electronics and Electrical Engineering and Control

Fixed-time convergent guidance law considering autopilot dynamics

ZHANG Kuanqiao ,
YANG Suochang ,
LI Baochen ,
LIU Chang

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1. Department of Missile Engineering, Shijiazhuang Campus of Army Engineering University, Shijiazhuang 050003, China;
2. Department of Scientific Research, Army Engineering University, Nanjing 210000, China

Received date: 2019-06-19

Revised date: 2019-07-15

Online published: 2019-09-02

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Abstract

A new guidance law considering the impact angle constraint, autopilot dynamic characteristics, and fixed-time convergence is designed for the guidance problem of attacking maneuvering targets. First, based on nonsingular terminal sliding mode control and fixed-time stability theory, the backstepping method is used to design the guidance law. In the process of the design, a nonsingular terminal sliding mode surface with fixed-time convergence is designed. Based on fixed-time control and sliding mode control, the virtual control law is designed and a nonlinear first-order filter is constructed to solve the problem of "differential expansion" in the traditional backstepping design. Based on the super-twisting algorithm and fixed-time stability theory, a fixed-time convergence sliding mode disturbance observer is designed to estimate the target maneuvering and other interferences. Then, based on the Lyapunov stability theory, the fixed-time stability of the guidance law is proved, and the expression for convergence time is given. Finally, the effectiveness of the proposed guidance law is verified by simulation analysis. Compared with the existing guidance laws, the proposed guidance law has higher guidance precision and angle constraint accuracy, faster system convergence speed, and less energy consumption.

Key words： guidance law; impact angle constraint; disturbance observer; fixed-time convergence; backstepping control; terminal sliding mode control; autopilot dynamics

Cite this article

ZHANG Kuanqiao , YANG Suochang , LI Baochen , LIU Chang . Fixed-time convergent guidance law considering autopilot dynamics[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(11) : 323227 -323227 . DOI: 10.7527/S1000-6893.2019.23227

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