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In this paper, we present a vision-based relative sensing system for UAVs to realize leader-follower formation flight without inter-vehicle communication. A monocular camera is mounted on the follower to detected the leader and measure the relative distance by using the geometry information of the leader without artificial markers. The measured relative distance is utilized to estimate the velocity...
Determining the motion of an unmanned aerial vehicle in GPS-denied environments is a challenging work. In this paper, we present a systematic design and implementation of a vision aided motion estimation approach for an unmanned helicopter in such a condition. A hierarchical vision scheme is proposed to detect a structured landmark, and find the correspondence between the 3D reference points and the...
This paper investigates the reconfiguration fault-tolerant control method of the on-orbit satellite attitude control system with recovered faults. A novel integrated approach is proposed includes a control effectiveness factor and a reconfigurable fault-tolerant controller. A two-stage Kalman filtering algorithm is developed to estimate the size of control effectiveness factor in the closed-loop attitude...
Delay-based TCP congestion avoidance methods such TCP Vegas, enhanced Vegas, and fast TCP all suffer from throughput degradation as illustrated by their inability to fully utilize the link bandwidth in a bidirectional bottleneck link topology. In this paper, we propose a Kalman filter implementation of a TCP congestion avoidance scheme that is derived by approximating the ideal window controller generated...
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