Designing and simulating aircraft decrab maneuver control law according to ICAO standards

To our knowledge, it is imperative for an automatic landing system in the Category III weather condition to have a decrab control unit. Therefore we design a decrab maneuver control law for the automatic landing of a certain civil airplane in accordance with the International Civil Aviation Organization (ICAO) standards under the Category III weather condition, taking into account its path precision tracking and robustness. The decrab maneuver control law is given in Eq. (2). We then establish the dynamic mathematical model of the designed automatic landing system and simulate the design with the MATLAB/Simulink to verify whether our design can satisfy the landing requirements under the Category III weather condition and analyze the stability and control accuracy of the landing control system. The simulation results, given in Figs. 6 through 9, and their analysis show preliminarily that with the decrab maneuver control law we designed, the crab angle, roll angle and sideslip angle of the airplane can meet the landing requirements under the CAT III weather condition.