[7] [7] YANG H JYE D.Time-varying formation tracking control for high-order nonlinear multi-agent systems in fixed-time framework［J］.Applied Mathematics and Computation 2020377(C).doi:10.1016/j.amc.2020.125119.

[8] [8] GHOMMAM JSAAD MWRIGHT Set al.Relay manoeuvre based fixed-time synchronized tracking control for UAV transport system［J］.Aerospace Science and Technology2020103.doi:10.1016/j.ast.2020.105887.

[9] [9] GAO Z YGUO G.Fixed-time sliding mode formation control of AUVs based on a disturbance observer［J］.IEEE/CAA Journal of Automatica Sinica20207(2):539-545.

[10] [10] LI Y JHOU M SLIANG Set al.Predefined-time adaptive fault-tolerant control of hypersonic flight vehicles without overparameterization［J］.Aerospace Science and Technology2020104:105987.

[13] [13] ZHAO YLIU Y FWEN G Ret al.Designing distributed fixed-time consensus protocols for linear multi-agent systems over directed graphs［J］.IEEE Transactions on Automatic Control201964(7).doi:10.1109/TAC.2018. 2872534.

[14] [14] WANG JLUO X YLI X Let al.Specified-time bearing-based formation control of multi-agent systems via a dynamic gain approach［J］.Journal of the Franklin Institute2018355(17):8619-8641.