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Time synchronization and ranging under unknown positions and velocities

Science China(Technological Sciences) 2017年第2期60卷 271-281页

作者： GU XiaoBo CHANG Qing XU Yong WANG Dun School of Electronic & Information Engineering Beihang University Space Star Technology Co. Ltd

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.

关键词： time synchronization two-way ranging relative motion clock model joint estimation

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On new measurement and communication techniques of GNSS inter-satellite links

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Science China(Technological Sciences) 2012年第1期55卷 285-294页

作者： XU Yong CHANG Qing YU ZhiJian School of Electronic ＆ Information Beihang University Beijing 100191 China Taiyuan Satellite Launch Center Taiyuan 030027 China

This paper studies the key techniques of the measurement and communication system for inter-satellite links(ISLs) of global navigation satellite system.A fixed link topology is designed based on the analysis of inter-satellite geometric properties and spatial parameters of the standard Walker24/3/2 *** design can achieve full network coverage with small num-ber of hops,significantly reduce the number of ISLs,and enhance the feasibility and reliability of the system.A new time-division duplex mode,as well as an integrated measurement and communication scheme,is proposed based on the de-signed ***,mathematical formulas,error models,and modification methods regarding two-way ranging and time synchronization algorithms using spread spectrum non-coherent data frame for this new system are comprehensively *** analysis and simulation studies demonstrate that our design,compared with current GPS systems,has higher ranging and time synchronization precision,improved measurement efficiency,and higher channel utilization ratio and data transmission *** has no restrictions of constellation configuration,making it suitable for both MEO and the future MEO/GEO hybrid *** results in this paper can serve as strong technical support for the next generation of GNSS ISL.

关键词： GNSS ISL STDD two-way ranging time synchronization

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