Robust extended state observer-based three dimensional integrated guidance and control design for interceptors with...

Area of Science:

• Aerospace Engineering
• Control Systems
• Robotics

Background:

• Interceptor guidance and control (IGC) systems face challenges with impact angle constraints and actuator saturation.
• Existing methods struggle with model uncertainties, external disturbances, and the computational complexity of control signal derivatives.
• Skid-to-turn (STT) interceptors require sophisticated control strategies for accurate targeting.

Purpose of the Study:

• To develop a novel three-dimensional integrated guidance and control (IGC) scheme for skid-to-turn interceptors.
• To incorporate impact angle and actuator saturation constraints into the IGC design.
• To enhance robustness against model uncertainties, external disturbances, and target maneuvers.

Main Methods:

• A six-degrees-of-freedom (6-DOF) realistic model of the interceptor was developed.
• The IGC scheme integrates backstepping, command filtering, sliding mode control (SMC), and super-twisting extended state observer (STESO).
• Command filters address the complexity of virtual control signal derivatives and actuator saturation.
• Finite-time STESO combined with SMC ensures robustness against disturbances and target accelerations.

Main Results:

• The proposed IGC scheme effectively handles impact angle and actuator saturation constraints.
• The integrated approach demonstrates strong robustness against lumped disturbances and target accelerations.
• Lyapunov stability theory confirms system stability and uniformly ultimately boundedness of all states.
• Extensive numerical simulations validate the effectiveness of the developed IGC method.

Conclusions:

• The novel IGC scheme provides a robust and effective solution for skid-to-turn interceptors.
• The method successfully manages complex constraints and uncertainties inherent in missile guidance.
• The findings contribute to the advancement of high-performance guidance and control systems for interceptors.