Time synchronization and ranging under unknown positions and velocities

The process to achieve time synchronization and ranging for a network of mobile nodes is raising a concern among researchers, and hence a variety of joint time synchronization and ranging algorithms have been proposed in recent years. However, few of them handle the case of all-node motion under unk...

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Veröffentlicht in:Science China. Technological sciences 2017-02, Vol.60 (2), p.271-281
Hauptverfasser: Gu, XiaoBo, Chang, Qing, Xu, Yong, Wang, Dun
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container_title Science China. Technological sciences
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creator Gu, XiaoBo
Chang, Qing
Xu, Yong
Wang, Dun
description The process to achieve time synchronization and ranging for a network of mobile nodes is raising a concern among researchers, and hence a variety of joint time synchronization and ranging algorithms have been proposed in recent years. However, few of them handle the case of all-node motion under unknown positions and velocities. This study addresses the problem of determining ranging and time synchronization for a group of nodes moving within a local area. First, we examined several models of clock discrepancy and synchronous two-way ranging. Based upon these models, we present a solution for time synchronization with known positions and velocities. Next, we propose a functional model that jointly estimates the clock skew, clock offset, and time of flight in the absence of a priori knowledge for a pair of mobile nodes. Then, we extend this model to a network-wide time synchronization scheme by way of a global least square estimator. We also discuss the advantages and disadvantages of our model compared to the existing algorithms, and we provide some applicable scenarios as well. Finally, we show that the simulation results verify the validity of our analysis.
doi_str_mv 10.1007/s11431-016-0273-3
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subjects Algorithms
Engineering
Nodes
Time synchronization
位置
功能模型
时钟偏差
时间同步
最小二乘估计
测距算法
移动节点
速度
title Time synchronization and ranging under unknown positions and velocities
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