Airplane Ground Collision Avoidance System Design based on Optimal Tracking Control

Document Type : Original Article

Authors

1 Department of Aerospace engineering KNTU.ac.ir

2 Department of Aerospace Engineering. KNTU.ac.ir

3 Electrical Engineering Department ' Qazvin Islamic Azad University

4 Aerospace Department Malek-Ashtar university of Technology

10.22034/jast.2021.295181.1080

Abstract

The design of a ground collision avoidance system for an airplane based on optimal control theory is presented in this paper. A control system is designed by linear quadratic tracker to track desired Euler angles of airplane. Two different systems are designed here. 1- A system independent of 3 dimensional maps, called Digital Terrain Database(DTD), by
using a forward looking camera; 2- A system using DTD. Also the obstacle is analyses by digital image processing techniques. An optimal flight control system based on discrete-time linear quadratic tracker is designed, to fly over/ side of obstacles like mountains automatically. Two distinctive systems are designed. First system uses forward-looking camera (as a backup system, when three-dimensional maps are not available); and the second system as the main system, which uses digital terrain models of terrain. Therefore, by generating desired state variables in guidance system, and using these outputs of the guidance system as the inputs of the optimal controller (LQT), the airplane would hopefully no more crash into terrain. In addition, the optimal controls, the angle of attack, and load factor, are within the allowable ranges, and are acceptable. The angular velocities and Controls became zero at the end of the maneuvers.

Keywords

Main Subjects


Article Title [فارسی]

Airplane Ground Collision Avoidance System Design based on Optimal Tracking Control

Authors [فارسی]

  • Amirali Nikkhah 1
  • Hoseyn Mojarrab 2
  • Fatemeh Mojarrab 3
  • Reza Zardashti 4
1 Department of Aerospace engineering KNTU.ac.ir
2 Department of Aerospace Engineering. KNTU.ac.ir
3 Electrical Engineering Department ' Qazvin Islamic Azad University
4 Aerospace Department Malek-Ashtar university of Technology
Abstract [فارسی]

The design of a ground collision avoidance system for an airplane based on optimal control theory is presented in this paper. A control system is designed by linear quadratic tracker to track desired Euler angles of airplane. Two different systems are designed here. 1- A system independent of 3 dimensional maps, called Digital Terrain Database(DTD), by
using a forward looking camera; 2- A system using DTD. Also the obstacle is analyses by digital image processing techniques. An optimal flight control system based on discrete-time linear quadratic tracker is designed, to fly over/ side of obstacles like mountains automatically. Two distinctive systems are designed. First system uses forward-looking camera (as a backup system, when three-dimensional maps are not available); and the second system as the main system, which uses digital terrain models of terrain. Therefore, by generating desired state variables in guidance system, and using these outputs of the guidance system as the inputs of the optimal controller (LQT), the airplane would hopefully no more crash into terrain. In addition, the optimal controls, the angle of attack, and load factor, are within the allowable ranges, and are acceptable. The angular velocities and Controls became zero at the end of the maneuvers.

Keywords [فارسی]

  • Ground Collision Avoidance System
  • Linear quadratic tracker
  • Digital Image Processing
  • optimal control system
  • Digital Terrain Database