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This paper introduces and demonstrates a combination scheme for the combination of Wi-Fi based and camera based localization technologies to increase the applicability in indoor environments. The scheme is developed on the basis of an analytical approach by looking for maximizing the probability of appearance and the reliability of the location results provided by underlying technologies. The proposed...
The visually servoed trajectory tracking of quadrotors has attracted many academic researchers over the past decade, and numerous controllers are proposed for this challenging problem. The trajectory tracking controller proposed in this paper follows the Position Based Visual Servoing (PBVS) paradigm. Most of the PBVS controllers, if not all, are implemented assuming that the position of the quadrotor...
Chattering effect is often associated negatively with the application of the robust nonlinear sliding mode control. This paper compares the tracking responses of system controlled with different controllers and demonstrates the ability of super twisting sliding mode control in chattering suppression and enhancement of tracking performance against classical controller and traditional sliding mode control...
Relative localization is a core problem for swarm robotics since each swarm node must determine where neighboring robots are located to accomplish cooperative tasks such as formation control. In this paper we present a system that performs relative localization between a stationary marker and a flying robot in real-time. Relative distances are obtained using ultra-wide band radio, while a low-cost...
A nonlinear output feedback control method is presented, which achieves asymptotic altitude and attitude trajectory tracking of a quadrotor system in the presence of model uncertainty and unknown external disturbances. To address a practical scenario where velocity measurements are not available, a bank of dynamic filters is utilized, which acts as a velocity observer in the closed-loop system. A...
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