Improved Adaptive Compensation of Variant Fighter With Multiple Faults via Extended Observer

This research is devoted to devising a fault-tolerant control system to resolve the challenge of multi-fault automatic repair in variable-structure flight conditions of fighters. In the classical fighter system, the increment of the state parameter is used to represent the variable structure parameter. To illustrate the broad applicability of the following technique, Rudder and Sensor Gain Loss and Bias Faults are constructed. The Extended Observer is designed to simultaneously gauge faults, states, and disturbances. Furthermore, the harmonic functions is designed to quickly adapt to fighter configuration changes, time-varying disturbances, and to estimate all failures. Similar harmonic functions also appear in the design of fault self-healing algorithms, i.e., adaptive fault-tolerant controllers with variable-structure harmonic functions, simultaneously repairing gain loss and bias faults of rudder and sensors. Verification of the method’s effectiveness is achieved through semi-physical simulations, while the Lyapunov function function demonstrates the system’s stability.