TAILIEUCHUNG - 3D path following control for UAV-MiG-21

This paper presents the method of 3D path following control for UAV-MiG-21 based on the notion of virtual target point (VTP) by solving problem using the geometric method. In addition, the article provides a virtual target distance selection method to reduce static errors. | Nghiên cứu khoa học công nghệ 3D PATH FOLLOWING CONTROL FOR UAV-MiG-21 Le Ngoc Lan1 Nguyen Vu2 Hoang Minh Dac1 Vu Hoang Nam Anh1 Nguyen Huu Dat3 Abstract This paper presents the method of 3D path following control for UAV-MiG-21 based on the notion of virtual target point VTP by solving problem using the geometric method. In addition the article provides a virtual target distance selection method to reduce static errors. The results of this research will facilitate the realization of the MiG-21 automatic flight control system which contributes to the performance of modification the MiG-21 into a UCAVfor automatic fighting missions. Keywords 3D Path following Virtual target point UAV-MiG-21. 1. INTRODUCTION The path following control problem is being considered in UAV flight control. Previous articles often focused on path following in 2D 1 2 5 . In recent years there have been much of interest in 3D path following 3 4 . Although there are a lot of path following methods 1 the path following methods were based on the use of commercial APs as shown in 1 4 . The idea of using a MiG-21 as a UAV for performing combat missions in our current conditions is essential. However the MiG-21 could not use commercial APs. Therefore the question of developing path following for MiG-21 a specific object available to perform automated flight is a practical issue. In this article basing on the idea of using a virtual target point the aircraft will follow a virtual target point running on desired paths we develop 3D path following for UAV-MiG-21 by solving geometric problem. In addition we provide a method to determine the distance from projection of aircraft on the path to the virtual target point for reducing the static error shown clearly in follow the Loiter path . The distance from projection of aircraft on the path to the VTP is not fixed it is variable that depends on the cross-track error. In the second section the problems of path following are investigated this part .

• Tự động hoá
• 3D Path following
• Virtual target point
• UAV MiG 21
• Geometric method
• Automatic fighting missions