A Reliable Control Method for Cyber-Physical Systems Under Hybrid Attacks

Abstract

The invention relates to a reliable control method for an information physical system under hybrid attack, thereby solving an information physical system control problem of attacks on a perception execution layer and a data transmission layer. The method comprises the following steps: establishing a control-oriented dynamic model of an information physical system under a hybrid attack and carryingout mathematical representation on the attack on the information physical system; constructing an auxiliary state variable, expanding system measurement information into a system state variable, andconstructing an augmentation system; for the augmentation system, designing an attack observer to estimate the attack of the data transmission layer in real time, and calculating the gain of the attack observer; and finally, designing a composite controller according to the output value of the attack observer and completing the calculation of the gain of the controller to realize reliable controlof the information physical system under the hybrid attack. The method has characteristics of strong anti-attack capability and high reliability and is suitable for safety control of the information physical system under the condition that the perception execution layer and the data transmission layer are attacked at the same time.

Description

technical field [0001] The invention relates to a reliable control method for cyber-physical systems under hybrid attacks, which can simultaneously realize real-time estimation and offset of data transmission layer attacks and perception execution layer attacks, and can be used for highly reliable control of cyber-physical systems under hybrid attacks. Background technique [0002] With the development and integration of communication technology, computer technology and control technology, cyber-physical systems have emerged as the times require. At present, most cyber-physical systems, such as smart grids and aerospace fields, are important facilities related to national security and people's livelihood. The security and reliability of these systems are often threatened by attackers. A typical feature of the cyber-physical system is that the control layer and the perception execution layer need to communicate through the data transmission layer. Therefore, for attacks on th...

AI Technical Summary

Problems solved by technology

A typical feature of the cyber-physical system is that the control layer and the perception execution layer need to communicate through the data transmission layer. Therefore, for attacks on the cyber-physical system, the attacker acquires sensor information in the communication link and tampers with it, thereby Realize the purpose of deceiving the control layer, and eventually lead to system control performance degradation or even collapse

[0003] At present, in response to the problem of cyber-physical system anti-attack control, Chinese patent application No. 201810225313.5 proposes a spacecraft anti-jamming attitude control method in which the measurement and control link is attacked by playback. The patent is to superimpose the watermark signal on the control signal to detect Replay attack in the communication link, but the anti-attack control of the system is not performed, and the superimposed watermark signal will reduce the control performance of the system; Chinese patent application number 201810436189.7 proposes a spacecraft whose sensors are attacked in a space countermeasure environment The attitude control method, the patent combines the output filter and the learning observer to estimate the sensor attack, but on the one hand, this method cannot clarify the time-varying characteristics of the sensor attack; on the other hand, the estimation accuracy of the learning observer depends on the learning time interval

To sum up, there are currently few researches on the anti-attack control of the data transmission layer and perception execution layer of cyber-physical systems, so it is urgent to solve the problem of high-reliability control under mixed attacks in cyber-physical systems

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