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A new mixed location algorithm for WSN is proposed in this paper. The distance is calculated based on DV-Hop algorithm, and the initial position is estimated by Centroid algorithm, then the result is optimized by Mass-spring optimization. MATLAB simulation result shows that, compared with DV-Hop, the error of the mixed algorithm is reduced about 15%. It does not need additional hardware, and the positioning...
Severe received signal strength (RSS) fluctuation is one of the crucial problems in an indoor positioning system using fingerprint-based algorithms. Even at a fixed location, the RSSs received by a mobile device at different time have large discrepancy. Adopting these fluctuated signals for positioning may lead to inaccurate results. To mitigate this problem, in this paper, any of the existing fingerprint-based...
A Bayesian lower bound is proposed as a new baseline for the positioning accuracy provided by satellite radionavigation signals in the presence of Gaussian noise and interference. Positioning accuracy is typically investigated using the Crame??r-Rao Bound (CRB), but the CRB does not always constitute a tight benchmark. The proposed bound is used to obtain a threshold on signal energy that indicates...
In laser osteotomy bone is cut precisely with a laser. A robot is used to position an end-effector with a scanhead, which deflects the cutting laser. An optical tracking system (OTS) tracks the position of the bone, in our case a skull, and the end effector. The skull is registered to its model, based on a segmented CT data, as well as the robot to the OTS. With this a complete transformation chain...
A positioning system is presented, which is based on wireless transceivers capable of measuring time of flight. As raw measurements still suffer from distortion and environmentally caused noise, mathematical tools are employed to significantly improve the quality and accuracy of positioning in realtime. Implementation results and simulation of larger scale networks show a very promising bounded error...
A radio positioning system which uses a PHS terminal and a radio beacon is developed to achieve a low-cost and high accurate positioning system for logistics. Since the PHS positioning error is several hundred meters, it cannot be used to find lost transport objects. In this system, a radio beacon is attached to the PHS terminal and their position is searched by a Yagi antenna. The radio beacon can...
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