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Mathematical Problems in Engineering
Volume 2014, Article ID 637034, 9 pages
http://dx.doi.org/10.1155/2014/637034
Research Article

The Quadrotor Dynamic Modeling and Indoor Target Tracking Control Method

College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China

Received 9 December 2013; Accepted 13 February 2014; Published 20 March 2014

Academic Editor: Xiaojie Su

Copyright © 2014 Dewei Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A reliable nonlinear dynamic model of the quadrotor is presented. The nonlinear dynamic model includes actuator dynamic and aerodynamic effect. Since the rotors run near a constant hovering speed, the dynamic model is simplified at hovering operating point. Based on the simplified nonlinear dynamic model, the PID controllers with feedback linearization and feedforward control are proposed using the backstepping method. These controllers are used to control both the attitude and position of the quadrotor. A fully custom quadrotor is developed to verify the correctness of the dynamic model and control algorithms. The attitude of the quadrotor is measured by inertia measurement unit (IMU). The position of the quadrotor in a GPS-denied environment, especially indoor environment, is estimated from the downward camera and ultrasonic sensor measurements. The validity and effectiveness of the proposed dynamic model and control algorithms are demonstrated by experimental results. It is shown that the vehicle achieves robust vision-based hovering and moving target tracking control.