TSMU: A Time Synchronization Scheme for Mobile Underwater Sensor Networks

Author(s):  
Jun Liu ◽  
Zhaohui Wang ◽  
Zheng Peng ◽  
M. Zuba ◽  
Jun-Hong Cui ◽  
...  
2014 ◽  
Vol 13 (3) ◽  
pp. 582-595 ◽  
Author(s):  
Jun Liu ◽  
Zhaohui Wang ◽  
Michael Zuba ◽  
Zheng Peng ◽  
Jun-Hong Cui ◽  
...  

2012 ◽  
Vol 246-247 ◽  
pp. 806-810 ◽  
Author(s):  
Ying Guo ◽  
Yu Tao Liu

To synchronize nodes’ time in mobile underwater sensor networks, a collision based time synchronization scheme called “Coll-Sync” is proposed, which is a novel time synchronization approach for underwater acoustic environment. Collision has been identified as a major challenge to communication, and current systems implement sophisticated solutions to detect and avoid it. Coll-Sync shows that collision contains highly useful information that can be leveraged to improve time synchronization greatly. It is the first time synchronization algorithm that does not suffer but benefit from collision in underwater acoustic channel. Simulation results show that Coll-Sync has high precision and low energy cost. It significantly outperforms existing time synchronization schemes.


2013 ◽  
Vol 24 (2) ◽  
pp. 406-416 ◽  
Author(s):  
Jun Liu ◽  
Zhong Zhou ◽  
Zheng Peng ◽  
Jun-Hong Cui ◽  
Michael Zuba ◽  
...  

Author(s):  
Junhai Luo ◽  
Liying Fan

Underwater Sensor Networks (UWSNs) can enable a broad range of applications such as resource monitoring, disaster prevention, and navigation-assisted. It is especially relevant for sensor nodes location in UWSNs. Global Positioning System (GPS) is not suitable for using in UWSNs because of the underwater propagation problems. Hence some localization algorithms based on the precise time synchronization between sensor nodes have been proposed which are not feasible for UWSNs. In this paper, we propose a localization algorithm called Two-Phase Time Synchronization-Free Localization Algorithm (TP-TSFLA). TP-TSFLA contains two phases, namely, range-based estimation phase and range-free evaluation phase. In the first phase, we address a time synchronization-free localization scheme base on the Particle Swarm Optimization (PSO) algorithm to decrease the localization error. In the second phase, we propose a Circle-based Range-Free Localization Algorithm (CRFLA) to locate the unlocalized sensor nodes which cannot obtain the location information through the first phase. In the second phase, sensor nodes which are localized in the first phase act as the new anchor nodes to help realize localization. Hence in this algorithm, we use a small number of mobile beacons to help achieve location without any other anchor nodes. Besides, to improve the precision of the range-free method, an extension of CRFLA by designing a coordinate adjustment scheme is updated. The simulation results show that TP-TSFLA can achieve a relative high localization ratio without time synchronization.


IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 52379-52389 ◽  
Author(s):  
Feng Zhou ◽  
Qi Wang ◽  
Guangjie Han ◽  
Gang Qiao ◽  
Zongxin Sun ◽  
...  

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