TSMU: A Time Synchronization Scheme for Mobile Underwater Sensor Networks

2011 ◽  
Author(s):  
Jun Liu ◽  
Zhaohui Wang ◽  
Zheng Peng ◽  
M. Zuba ◽  
Jun-Hong Cui ◽  
...  
Keyword(s):  
Sensor Networks ◽  
Time Synchronization ◽  
Underwater Sensor Networks ◽  
Synchronization Scheme

DA-Sync: A Doppler-Assisted Time-Synchronization Scheme for Mobile Underwater Sensor Networks

2014 ◽  
Vol 13 (3) ◽  
pp. 582-595 ◽  
Author(s):  
Jun Liu ◽  
Zhaohui Wang ◽  
Michael Zuba ◽  
Zheng Peng ◽  
Jun-Hong Cui ◽  
...  
Keyword(s):  
Sensor Networks ◽  
Time Synchronization ◽  
Underwater Sensor Networks ◽  
Synchronization Scheme

Collision Based Time Synchronization for Underwater Sensor Networks

2012 ◽  
Vol 246-247 ◽  
pp. 806-810 ◽  
Author(s):  
Ying Guo ◽  
Yu Tao Liu
Keyword(s):  
Sensor Networks ◽  
Energy Cost ◽  
Time Synchronization ◽  
Underwater Sensor Networks ◽  
Underwater Acoustic ◽  
Acoustic Environment ◽  
Simulation Results ◽  
Synchronization Scheme ◽  
First Time ◽  
Current Systems

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.

Mobi-Sync: Efficient Time Synchronization for Mobile Underwater Sensor Networks

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

scholarly journals Two-Phase Time Synchronization-Free Localization Algorithm for Underwater Sensor Networks

2017 ◽  
Author(s):  
Junhai Luo ◽  
Liying Fan
Keyword(s):  
Sensor Networks ◽  
Time Synchronization ◽  
Sensor Nodes ◽  
Second Phase ◽  
Underwater Sensor Networks ◽  
Localization Algorithm ◽  
Two Phase ◽  
Phase Time ◽  
Anchor Nodes ◽  
Range Free

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.

scholarly journals APE-Sync: An Adaptive Power Efficient Time Synchronization for Mobile Underwater Sensor Networks

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 52379-52389 ◽  
Author(s):  
Feng Zhou ◽  
Qi Wang ◽  
Guangjie Han ◽  
Gang Qiao ◽  
Zongxin Sun ◽  
...  
Keyword(s):  
Sensor Networks ◽  
Time Synchronization ◽  
Underwater Sensor Networks ◽  
Power Efficient ◽  
Adaptive Power
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