77 research outputs found
Composite finiteātime convergent guidance law for maneuvering targets with secondāorder autopilot lag
This paper aims to develop a new finiteātime convergent guidance law for intercepting maneuvering targets accounting for secondāorder autopilot lag. The guidance law is applied to guarantee that the line of sight (LOS) angular rate converges to zero in finite time and results in a direct interception. The effect of autopilot dynamics can be compensated based on the finiteātime backstepping control method. The time derivative of the virtual input is avoided, taking advantage of integralātype Lyapunov functions. A finiteātime disturbance observer (FTDOB) is used to estimate the lumped uncertainties and highāorder derivatives to improve the robustness and accuracy of the guidance system. Finiteātime stability for the closedāloop guidance system is analyzed using the Lyapunov function. Simulation results and comparisons are presented to illustrate the effectiveness of the guidance strategy
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