A guidance law with finite time convergence considering autopilot dynamics and uncertainties

TLDR: In this article, the authors proposed a finite time convergent guidance law for a homing missile to intercept a maneuvering target. And they proved that the line-of-sight (LOS) angular rate converges to zero in finite time under the proposed guidance law.

Abstract: Taking into consideration both the autopilot dynamics and uncertainties, this paper proposes a finite time convergent guidance law for homing missile to intercept a maneuvering target Firstly, an exact observer (differentiator) is employed to estimate the target maneuvers in finite time Then, a finite time convergent guidance law is designed based on the existing finite time sliding-mode control theory It is proved that the line-of-sight (LOS) angular rate converges to zero in finite time under the proposed guidance law Compared with the existing finite time guidance laws, this guidance law can compensate for the effects of the autopilot dynamics and uncertainties, and the information used for feedback control is much easier to obtain Finally, simulation results show that our scheme, as a finite time convergent algorithm, has strong robustness to bounded disturbances