DE-Sync: A Doppler-Enhanced Time Synchronization for Mobile Underwater Sensor Networks.
DE-Sync: A Doppler-Enhanced Time Synchronization for Mobile Underwater Sensor Networks.
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DE-Sync：移动水下传感器网络的多普勒增强时间同步
DOI：
10.3390/s18061710
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发表时间：
2018-05-25
期刊：
影响因子：
--
通讯作者：
Qiao G
中科院分区：
文献类型：
--
作者：
Zhou F;Wang Q;Nie D;Qiao G
时间同步是水下传感器网络节点协同工作的基础，在水下传感器网络的研究和应用中起着至关重要的作用。虽然已经提出了许多陆地无线传感器网络的时间同步协议，他们不能直接应用于水下传感器网络。这是因为它们中的大多数通常假设传感器节点之间的传播延迟可以忽略不计，而在水下传感器网络中并非如此。由于声信号的传播速度较低，传感器节点之间的传播延迟较长，这是影响时间同步的主要因素。此外，由于风或洋流，水下传感器节点往往会经历一定程度的移动性，或者一些其他节点位于自推进车辆上，例如自主水下航行器（AUV）。本文提出了一种基于多普勒增强的移动的水下传感器网络时间同步方案，称为DE-Sync。新方案在估计多普勒比例因子的过程中考虑了时钟偏差的影响，直接将多普勒比例因子代入线性回归中，实现了对时钟偏差和偏移的估计。仿真结果表明，DE-Sync在准确性和能量效率方面优于现有的时间同步协议。
Time synchronization is the foundation of cooperative work among nodes of underwater sensor networks; it takes a critical role in the research and application of underwater sensor networks. Although numerous time synchronization protocols have been proposed for terrestrial wireless sensor networks, they cannot be directly applied to underwater sensor networks. This is because most of them typically assume that the propagation delay among sensor nodes is negligible, which is not the case in underwater sensor networks. Time synchronization is mainly affected by a long propagation delay among sensor nodes due to the low propagation speed of acoustic signals. Furthermore, sensor nodes in underwater tend to experience some degree of mobility due to wind or ocean current, or some other nodes are on self-propelled vehicles, such as autonomous underwater vehicles (AUVs). In this paper, we propose a Doppler-enhanced time synchronization scheme for mobile underwater sensor networks, called DE-Sync. Our new scheme considers the effect of the clock skew during the process of estimating the Doppler scale factor and directly substitutes the Doppler scale factor into linear regression to achieve the estimation of the clock skew and offset. Simulation results show that DE-Sync outperforms existing time synchronization protocols in both accuracy and energy efficiency.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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通讯作者：
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DOI：
10.3390/s17010141
发表时间：
2017-01-13
期刊：
Sensors (Basel, Switzerland)
影响因子：
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作者：
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DOI：
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发表时间：
2015-08-06
期刊：
Sensors (Basel, Switzerland)
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