Adaptive output-feedback dynamic fault-tolerant control-based integrated guidance and control

Abstract

In the terminal guidance, the design of the inner loop autopilot seriously affects the performance of guidance, which is still a challenging research issue. To enhance the matching relationship of guidance subsystem and control subsystem, this paper proposes an adaptive output-feedback dynamic fault-tolerant integrated guidance and control (IGC) design for the skid-to-turn (STT) interceptor to study the autopilot design in detail, taking the fault model of the actuator into account. First, we propose nonlinear IGC model, which fusion the modeling disturbances, autopilot lag dynamics model, fault model, saturation deflection angle, and other relevant factors. And transform it into a general form for simple control of the scheme design. Additionally, the proposed IGC scheme is derived by incorporating the virtual control variable and dynamic error surface into the backstepping control design. Then, the uncertainties of the IGC model and target maneuvering acceleration are integrated into the lumped disturbance. In the IGC scheme design, they introduce the parameter delay design method while proposing an enhanced adaptive control approach to accurately estimate the lumped disturbance. Furthermore, the theoretical proof of stability of the proposed IGC system employs the barrier Lyapunov function. Ultimately, numerical simulation results indicate that the proposed IGC strategy against non-maneuvering can guarantee the Euler angle's convergence to stability within 5 s, while keeping the final stability error within 0.2 deg.