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Cooperative positioning is an emerging topic in wireless sensor networks and navigation. It can improve the positioning accuracy and coverage in GPS-challenged conditions such as inside tunnels, in urban canyons, and indoors. Different algorithms have been proposed relying on iteratively exchanging and updating positional information. For the purpose of computational complexity, network traffic, and...
Current state of the art localization scheme is able to locate mobile device in multipath environment by using both Line of Sight (LOS) and Non Line of Sight (NLOS) Time-Of-Arrival (TOA) and Angle-Of-Arrival (AOA) information at both the mobile device and reference device side. Each set of measured TOA and AOA can be manipulated to form a line on which mobile device are most likely located, this line...
The basic K-means is sensitive to the initial centre and easy to get stuck at local optimal value. To solve such problems, a new clustering algorithm is proposed based on simulated annealing. The algorithm views the clustering as optimization problem, the bisecting K-means splits the dataset into k clusters at first, and then run simulated annealing algorithm using the sum of distances between each...
An electronic current transformer (ECT) calibration system based on virtual instrument technology is introduced in this paper. The system uses the fourth-order convolution window algorithm for error calculation method. Compared with Fast Fourier Transform, which is recommended by standard IEC-60044-8 (Electronic current transformers), it has higher accuracy. The relative measuring errors caused by...
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