| Citation: | TIAN Lei, ZHAO Qilun, DONG Xiwang, et al. Escort strategy based on loyal wingman in denial environment[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(5): 1058-1067. doi: 10.13700/j.bh.1001-5965.2020.0090(in Chinese)
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Escort strategy has always been one of the important studies of the major military powers and the denial environment with characteristics of strong electromagnetic interference and strong confrontation game puts forward higher requirements for escort strategy. This paper presents an escort strategy based on the distributed time-varying formation tracking control method. In this strategy, the high-cost lead aircraft detects the enemy missiles and releases several low-cost wingmen as loyal wingmen while moving for evasion. The time-varying formation tracking control methods are adopted to keep the wingmen on the line of sight axis associated with the lead aircraft and the enemy missiles, and then if necessary, the wingmen are sacrificed to protect the lead aircraft. As a result of the fact that the azimuth angles of enemy missiles are global information, the distributed observers are designed to estimate them. In the denial environment, the complex electromagnetic interference leads to the intermittent communication so that the communication topologies of systems composed by lead aircraft and wingmen are switched frequently. In order to deal with the damage of the communication topology caused by the electromagnetic interference and improve the ability of electromagnetic interference resistance, based on the observer theory, adaptive control theory and sliding mode control theory, a distributed control protocol with switching topologies is constructed under external disturbance of wingmen and the lead aircraft evasion. It is proven that the wingmen under the protocol can realize the escort strategy based on loyal wingman by Lyapunov theory in the denial environment. Finally, the effectiveness of the escort strategy is verified by simulating the attack scenario of the missiles.
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