Controls for a nonlinear system arising in vision‐based landing of airliners

Abstract

We use a novel backstepping method to solve a stabilization problem for a nonlinear system with delayed sampled outputs that are not accurately measured. We provide an application to a system arising in vision‐based landing of airliners that includes coupling between the lateral and longitudinal dynamics, for which we provide performance guarantees in the presence of the delay, nonlinearity, and sampling. Our major contributions are (a) designs of lateral and longitudinal controls for our nonlinear model of an aircraft landing on an unequipped runway, (b) mathematical proofs that our controls ensure that the aircraft being modeled achieves desired alignment with the runway during its align phase, under sampling and delays that arise from image processing of visual information, and (c) comparative simulations exhibiting considerable improvement in control performance compared with previous methods that did not take the coupling of the dynamics or imprecise delayed sampled measurements into account.

Adaptive fixed‐time dynamic surface fault‐tolerant control of nonlinear systems with sensor faults

“…Strictly speaking, all the systems have different degrees of nonlinear characteristics, which are always poorly known and reduce system performance. Analysis and design of nonlinear systems has become important research topic in the control field, see References 1‐3. With the increasing scale and complexity of the nonlinear systems, the requirements for high precision, rapidity, reliability and safety of the systems has become a remarkable issue.…”