Resilient Secure Tracking Control for Attitude-Orbit Integrated Spacecraft With Aperiodic DoS Attacks: A Fully Actuated System Approach

This paper studies the output feedback resilient secure tracking control strategy for a class of spacecraft attitude-orbit integrated systems with aperiodic denial-of-service (DoS) attacks on the sensor based on the fully actuated system approach. The attitude-orbit integrated system is defined as a six-degree-of-freedom nonlinear system with strong attitude-orbit coupling characteristics. Due to the limitations of measurement accuracy and physical conditions, the states of practical systems are not fully measurable. The data interactions between spacecraft sensors and controllers are based on the communication networks, which exhibit vulnerability to DoS attacks. Some existing works fail to consider unmeasurable states and secure communication burdens. The spacecraft attitude-orbit integrated model is given based on dual quaternions, and the fully actuated system subject to aperiodic DoS attacks is constructed based on twistor, variable elimination, and order elevation techniques. A resilient secure observer is designed based on the system output, and a secure control law is formed using the estimated states. A Lyapunov function is selected for the estimation error and the tracking error, and the system stability in different attack stages is quantitatively analyzed. Finally, the simulation results verify the effectiveness of the proposed output feedback secure control method. Note to Practitioners - The execution of on-orbit missions highly depends on the reliability and security of spacecraft attitude and orbit control systems. In practical scenarios, the systems are described as six-degree-of-freedom nonlinear models with strong attitude-orbit coupling characteristics and unmeasurable states. Meanwhile, the data interaction between spacecraft sensors and controllers is vulnerable to DoS attacks, which consume communication resources and block feedback signal transmission. This paper is motivated by the urgent engineering demand for practical secure output feedback control schemes to address the above problems. We first construct a spacecraft attitude-orbit integrated model with aperiodic DoS attacks based on the twistor technique and fully actuated system approach. To tackle the unmeasurable states and DoS attack threats, we design a secure observer with resilient switchable structure, and further develop an output feedback secure tracking control law.