Proceedings ArticleDOI
Multi-hop time synchronization for Underwater Acoustic Networks
Chuan Sun,Feng Yang,Lianghui Ding,Liang Qian,Cheng Zhi +4 more
- pp 1-7
TLDR
This paper proposes a multi-hop time synchronization scheme for Underwater Acoustic Networks (MSUAN), and uses OPNET to simulate MSUAN, and the simulation result under pyramid topology shows that even the hop accumulates to 8, for MS UAN, the average offset error is maintained at about 58us and the average skew error is below 2ppm.Abstract:
Time synchronization plays an important role in UANs, which need fine-grained coordination among nodes. Precise time synchronization is also needed for a variety of other coordinate tasks in UANs such as data fusion, TDMA scheduling, localization, power-saving and so on. Recently, time synchronization protocol for point-to-point with high propagation delay has been proposed, while time synchronization for multi-hop UANs is still an open issue. In this paper, we propose a multi-hop time synchronization scheme for Underwater Acoustic Networks (MSUAN). MSUAN includes three stages. In the first stage, we assign each node a level by establishing a path to the reference node. During the second phase, nodes realize synchronization by receiving synchronization packets both from it's parent node and neighboring nodes. The third stage re-synchronizes nodes because the clock may drift away without synchronization for long time. Mathematical analysis of MSUAN's synchronization error shows that the more time-stamps we get, the more accurate skew we will get. At the end, we use OPNET to simulate MSUAN, and the simulation result under pyramid topology shows that even the hop accumulates to 8, for MSUAN, the average offset error is maintained at about 58us and the average skew error is below 2ppm.read more
Citations
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Proceedings ArticleDOI
Reverse Flooding: Exploiting Radio Interference for Efficient Propagation Delay Compensation in WSN Clock Synchronization
TL;DR: In this paper, the authors proposed a method to estimate and compensate for the propagation delays in WSNs. But the propagation delay estimator does not require maintaining a spanning tree of the network, and exploits constructive interference even to transmit packets whose content are slightly different.
Proceedings ArticleDOI
Reverse Flooding: exploiting radio interference for efficient propagation delay compensation in WSN clock synchronization
TL;DR: Experimental results prove the feasibility of measuring propagation delays using off-the-shelf microcontrollers and radio transceivers, and show how the proposed solution allows to achieve sub-microsecond clock synchronization even for networks where propagation delays are significant.
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Simulation and Performance Analysis of the IEEE1588 PTP with Kalman Filtering in Multi-hop Wireless Sensor Networks
TL;DR: Simulation results show that the proposed Kalman filtering improves the performance of time synchronization in multi-hop WSNs in terms of offset and skew estimation.
Proceedings ArticleDOI
Implementation of multi-hop time synchronization on miniature test-bed setup of underwater acoustic sensor network
TL;DR: A very simple extension and implementation of Tri-message time synchronization protocol for multi-hop Underwater Acoustic Sensor Network (UASN) on the miniature test-bed setup is described.
Journal ArticleDOI
Joint Algorithm for Multi-Hop Localization and Time Synchronization in Underwater Sensors Networks Using Single Anchor
TL;DR: In this paper, an effort to synchronize and localize the underwater sensors simultaneously in a multi-hop environment is considered, where the authors have established a connection between sensors point to point directed links and then analytically constructed the model for the synchronization as a function of range, delay, and timestamps.
References
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