title: Continuous composite finite-time convergent guidance laws with autopilot dynamics compensation.
abstract: This paper has proposed two continuous composite finite-time convergent guidance laws to intercept maneuvering targets in the presence of autopilot lag: one is for hit-to-kill and the other is for zeroing the line-of-sight (LOS) angular rate. More specifically, the nonlinear disturbance observer (NDOB) is used to estimate the lumped uncertainty online while the finite-time control technique is used to fulfill the design goal in finite time. The key feature in derivation of the proposed guidance law is that two integral-type Lyapunov functions are used to avoid analytic differentiation of virtual control law encountered with traditional backstepping. The finite-time stability of the closed-loop nonlinear observer-controller system is established using finite-time bounded (FTB) function and Lyapunov function methods. Numerical simulations with some comparisons are carried out to demonstrate the superiority of the proposed method.
authors.affiliation: School of Aerospace Engineering, Beijing Institute of Technology, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, PR China. Electronic address: shaoming.he.cn@gmail.com.
authors.forename: Shaoming
authors.initials: S
authors.lastname: He
authors.affiliation: School of Aerospace Engineering, Beijing Institute of Technology, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, PR China. Electronic address: lindf@bit.edu.cn.
authors.forename: Defu
authors.initials: D
authors.lastname: Lin
keywords: Autopilot lag; Finite-time convergence; Maneuvering target; Missile guidance; Nonlinear disturbance observer