Adaptive CMAC Control and Stability Analysis of Intelligent Automatic Landing System

• Main Authors: Teng-Chieh Yang, 楊登傑
• Other Authors: Jih-Gau Juang
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/16891242439216753225

碩士 === 國立臺灣海洋大學 === 通訊與導航工程系 === 97 === According to flight records, most aircraft accidents occurred during final approach. According to a survey of the National Transportation Safety Board, 12 % of aircraft accidents in the years of 1950 to 2008 were weather related. Among these accidents, some causes are attributed to weather and human factors. When aircraft approaches landing phase the altitude is low and the speed is slow. If the aircraft encountered wind shear or turbulence while landing it could cause altitude loss, heading variation and even crash. Nowadays, most aircraft have installed the Automatic Landing System (ALS) which relies on the Instrument Landing System (ILS) to help aircraft landing safely and reduces pilot’s work loading greatly. But control schemes of the conventional ALS usually use gain-scheduling and conventional adaptive control techniques. If the flight conditions are beyond the preset envelope, the ALS is disabled and the pilot takes over. In order to improve the performance of the ALS, this paper presents several hybrid CMACs to replace conventional controller and guide the aircraft to a safe landing. Moreover, stability of the proposed automatic landing control system is guaranteed by Lyapunov theorem. Optimal learning rates are derived by convergence theorem. Finally, from theory analysis and simulation results, the proposed intelligent controllers can enable the aircraft to adapt to wide range of wind disturbances and guide the aircraft to a safe landing.