Disturbance and Uncertainty Rejection-Based on Fixed-Time Sliding-Mode Control for the Secure Communication of Chaotic Systems

Nam Van Giap,Shyh-Chour Huang,Quang Dich Nguyen,Hong Son Vu

doi:10.1109/access.2021.3114030

Abstract

This study provides a new development regarding uncertainty and disturbance estimation (UDE) based on fixed-time sliding mode control (FTSMC) for the secure communication of electronic circuits in a chaos-based system. Takagi-Sugeno (T-S) fuzzy systems were used to remodel chaotic systems with the aim of softening the control design for the synchronization of the chaos-based system. The master and slave systems of the secure communication system were maintained in chaotic formats. The originality of the proposed uncertainty and disturbance estimator is a condition associated with the first derivative of these values being free. The stability of the system was proven by using the Lyapunov condition. The states of master and slave systems were used for encryption and decryption, respectively. Finally, the correction of the proposed control theories was verified by MATLAB simulations, the simulation of the electronic circuits in OrCAD capture software, and experiments involving electronic circuit communication.

Highlights

Disturbance observers are well-known as robust control techniques for the suppression of perturbations from outside and inside of a control system
Since secure communication based on chaotic systems first appeared, many practical papers have dealt with the problem of synchronization control design and disturbance and uncertainty compensation
AN ILLUSTRATIVE EXAMPLE This paper focuses on the theory of circuit analysis, which is used to verify that the finite and fixed time controls can with application in secure communication

Summary

INTRODUCTION

Disturbance observers are well-known as robust control techniques for the suppression of perturbations from outside and inside of a control system. This paper uses fixed-time sliding-mode control for synchronizing the master and slave systems. DISTURBANCE AND UNCERTAINTY REJECTION BASED ON FIXED-TIME SLIDING-MODE CONTROL FOR THE SECURE COMMUNICATION OF CHAOTIC SYSTEMS To delete the disturbance and perturbations of system parameters variations, an improvement of DOB is constructed for the slave system via the control input channel. The first derivative disturbance observer can be softened by a new observer in this paper Otherwise, to suppress these perturbations perfectly, the fixed-time slidingmode control was designed for the synchronization system. B. FIXED-TIME SLIDING-MODE CONTROL BASED ON THE DISTURBANCE OBSERVER FOR THE SYNCHRONIZATION SYSTEM. Remark 10: Take note that, if the disturbance and uncertainty can be completely suppressed, the switching control gains can be chosen as small values to reduce the chattering

STABILITY ANALYSIS

AN ILLUSTRATIVE EXAMPLE

MATLAB SIMULATION PERFORMANCE

CONCLUSION