Purpose

This paper aims to devise a robust controller for the non-linear aircraft model using output feedback control topology in the presence of uncertain aerodynamic parameters.

Design/methodology/approach

Feedback linearization-based state feedback (SFB) controller is considered along with a robust outer loop control which is designed using Lyapunov’s second method. A high-gain observer (HGO) in accordance with the separation principle is used to implement the output feedback (OFB) control scheme. The robustness of the controller and observer is assessed by introducing uncertain aerodynamics coefficients in the dynamic model. The proposed scheme is validated using MATLAB/SIMULINK.

Findings

The efficacy of the proposed scheme is authenticated with the simulation results which show that HGO-based OFB control achieves the SFB control performance for a small value of the high-gain parameter in the presence of uncertain aerodynamic parameters.

Originality/value

A HGO for the non-linear model of aircraft with uncertain parameters is a novel contribution which could be further used for the unmanned aerial vehicles autopilot, flight trajectory tracking and path following.

中文翻译：

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固定翼飞机的鲁棒输出反馈控制

目的

本文旨在为存在不确定空气动力学参数的情况下使用输出反馈控制拓扑设计非线性飞机模型的鲁棒控制器。

设计/方法/方法

考虑了基于反馈线性化的状态反馈（SFB）控制器以及使用Lyapunov第二种方法设计的鲁棒外环控制。根据分离原理的高增益观察器（HGO）用于实现输出反馈（OFB）控制方案。通过在动态模型中引入不确定的空气动力学系数来评估控制器和观察者的鲁棒性。所提出的方案已使用MATLAB / SIMULINK进行了验证。

发现

仿真结果验证了该方案的有效性。仿真结果表明，在存在不确定的空气动力学参数的情况下，基于HGO的OFB控制可在小数值的高增益参数下实现SFB控制性能。

创意/价值

具有不确定参数的飞机非线性模型的HGO是一项新颖的贡献，可进一步用于无人机自动驾驶，飞行轨迹跟踪和路径跟踪。