A nonlinear disturbance observer-based adaptive integral sliding mode control for missile guidance system

Abstract

A novel composite three-dimensional (3D) guidance law based on an adaptive integral sliding mode (AISM) control utilizing a nonlinear disturbance observer (NDOB) technique is proposed for missiles. First, an integral sliding mode control is selected as the guidance law to get rid of the reaching phase of sliding mode control. Second, the switching gains are adjusted by designing an adaptive law. Finally, the NDOB is designed to estimate and compensate for the unknown target accelerations that are considered as the disturbance. Thus the NDOB and AISM law are combined into a novel composite guidance law to improve performance and to reduce the chattering phenomenon. Finally, to verify the effectiveness and robustness, numerical simulations are performed in different scenarios and these results are presented comparatively with the augmented proportional navigation (APN) and the AISM guidance law. Moreover, the proposed law outperforms the other schemes regarding the miss distance and interception time.

Keywords:

• Adaptive law
• guidance law
• integral sliding mode control
• missile
• nonlinear disturbance observer
• three-dimensional engagement geometry

Acknowledgments

Handan Gürsoy-Demir thanks The Scientific and Technological Research Council of Turkey (TÜBİTAK-BİDEB) for Ph.D. scholarship 2211-C (the encouragement scholarship for priority areas). This work is a part of Handan Gürsoy-Demir's Ph.D dissertation.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Türkiye Bilimsel ve Teknolojik Arastirma Kurumu.

Notes on contributors

Handan Gürsoy-Demir

Handan Gürsoy Demir received the B.Sc. degree in Computer Engineering from Cukurova University, Adana, Turkey, in 2012, and the M.Sc. degree in Computer Engineering from Hacettepe University, Ankara, Turkey, in 2016. She is currently working toward the Ph.D. degree in Computer Engineering at Hacettepe University, Ankara, Turkey.Her research interests include nonlinear, robust and adaptive control with applications to missile systems.

Mehmet Önder Efe

Mehmet Önder Efe received the B.Sc. degree in Electronics and Communications Engineering from Istanbul Technical University, Istanbul, Turkey, in 1993, the M.Sc. degree in Systems and Control Engineering from Boğaziçi University, Istanbul, Turkey, in 1996, and the Ph.D. degree in Electrical and Electronics Engineering from Boğaziçi University, in 2000.He is currently a professor with the Department of Computer Engineering, Hacettepe University, Ankara, Turkey.Dr. Efe serves and served as an associate editor of the IEEE Transactions on Industrial Electronics, IEEE Transactions on Industrial Informatics, IEEE/ASME Transactions on Mechatronics, and Editor of Transactions of the Institute of Measurement and Control and Measurement and Control.