[2] WANG D, ZONG Q, TIAN B, et al.Neural network disturbance observer-based distributed finite-time formation tracking control for multiple unmanned helicopters［J］.ISA Transactions, 2018, 73:208-226.

[4] WANG Y C, CHEN W S, ZHANG S X, et al.Command-filtered incremental backstepping controller for small unmanned aerial vehicles［J］.Journal of Guidance, Control & Dynamics, 2018, 41(4):1-14.

[5] WANG D, LIU D, LI H, et al.Neural-network-based robust optimal control design for a class of uncertain nonlinear systems via adaptive dynamic programming［J］.Information Sciences, 2014, 282:167-179.

[7] TANG X, TAO G, JOSHI S M.Adaptive actuator failure compensation for nonlinear MIMO systems with an aircraft control application［J］.Automatica, 2007, 43(11):1869-1883.

[8] SUN L H, WANG W D, YI R, et al.A novel guidance law using fast terminal sliding mode control with impact angle constraints［J］.ISA Transactions, 2016, 64:12-23.

[10] WU X W, XIAO B, QU Y H.Modeling and sliding mode-based attitude tracking control of a quadrotor UAV with time-varying mass［J］.ISA Transactions, 2019, 93:578-597.

[11] POLK Y, YURI S, CHRISTOPHER E.Continuous higher order sliding mode control with adaptation of air breathing hypersonic missile［J］.International Journal of Adaptive Control and Signal Processing, 2016, 30:1099-1117.

[12] WERBOS P.Beyond regression: new tools for prediction and analysis in the behavioral sciences［D］.Cambridge:Harvard University, 1974.

[14] SUN J L, LIU C S.Distributed fuzzy adaptive backstepping optimal control for nonlinear multimissile guidance systems with input saturation［J］.IEEE Transactions on Fuzzy Systems, 2018, 27(3):447-461.

[15] MU C X, NI Z, SUN C Y, et al.Air-breathing hypersonic vehicle tracking control based on adaptive dynamic programming［J］.IEEE Transactions on Neural Networks and Learning Systems, 2017, 28:584-598.

[16] FAN Q Y, YANG G H.Adaptive actor-critic design-based integral sliding-mode control for partially unknown nonlinear systems with input disturbances［J］.IEEE Transactions on Neural Network and Learning Systems, 2016, 27:165-177.

[17] ZHANG H G, QU Q X, XIAO G Y, et al.Optimal guaranteed cost sliding mode control for constrained-input nonlinear systems with matched and unmatched disturbances［J］.IEEE Transactions on Neural Networks and Learning Systems, 2018, 29:2112-2126.

[18] CHEN W H.Disturbance observer based control for nonlinear systems［J］.IEEE/ASME Transactions on Mechatronics, 2004, 9(4):706-710.

[19] UTKIN V, GULDNER J, SHI J X.Sliding mode control in electro-mechanical systems［M］.Boca Raton:CRC Press, 1999.

[20] YANG J, CHEN W H, LI S.Non-linear disturbance observer-based robust control for systems with mismatched disturbances/uncertainties［J］.IET Control Theory & Applications, 2011, 5(18):2053-2062.