scholarly journals IEEE 802.11-Based Wireless Sensor System for Vibration Measurement

2010 ◽  
Vol 2010 ◽  
pp. 1-9 ◽  
Author(s):  
Yutaka Uchimura ◽  
Tadashi Nasu ◽  
Motoichi Takahashi
Keyword(s):  
Ieee 802.11 ◽  
Time Synchronization ◽  
Vibration Measurement ◽  
Wireless Sensor ◽  
Wireless Sensing ◽  
High Rise ◽  
Network Time ◽  
New Applications ◽  
Wireless Sensing System ◽  
Synchronization Accuracy

Network-based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires vibration measurement. For the vibration measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard-based TSF-counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on synchronization accuracy and evaluated the effect by taking beacon collisions into account. The scalability issue by numerical simulations is also studied. This paper also introduces a newly developed wireless sensing system and the hardware and software specifications are introduced. The experiments were conducted in a reinforced concrete building to evaluate synchronization accuracy. The developed system was also applied for a vibration measurement of a 22-story steel structured high rise building. The experimental results showed that the system performed more than sufficiently.

scholarly journals An Energy Efficient Synchronization Protocol for Target Tracking in Wireless Sensor Array Networks

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1367
Author(s):  
Jie Shen ◽  
Ming Yin ◽  
Ji-An Luo ◽  
Zhi-Bo Wang ◽  
Zhi Wang ◽  
...  
Keyword(s):  
Target Tracking ◽  
Energy Efficient ◽  
Sensor Array ◽  
Time Synchronization ◽  
Wireless Sensor ◽  
Guarantee System ◽  
Network Maintenance ◽  
Array Synchronization ◽  
Synchronization Accuracy ◽  
Synchronization Protocol

Time synchronization is an important middleware function that supports the Quality of Service (QoS) of systems in wireless sensor array networks. Instead of providing high synchronization accuracy for all application scenarios, we argue that synchronization protocols should be application specific. In this paper, we exploit the synchronization requirements of target-tracking systems in wireless sensor array networks and propose an energy-efficient Sensor Array Synchronization Protocol (SASP), which provides the required synchronization accuracy to guarantee the QoS. Specifically, when no target appears, to guarantee system lifetime, coarse synchronization is achieved with little overhead by piggybacking time information onto periodical network maintenance packets. Once targets appear, SASP achieves high inter-array and relatively higher intra-array synchronization accuracy rather than the traditional network-wide high accuracy on average. In this way, it guarantees reliable communication and accurate data fusion, while reducing energy consumption. Theoretical analysis and extensive evaluations show the effectiveness of the proposed protocol.

scholarly journals Energy Consumption Analysis of Consensus Time Synchronization Algorithms for Wireless Sensor Networks

2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Niranjan Panigrahi ◽  
Pabitra Mohan Khilar
Keyword(s):  
Wireless Sensor Networks ◽  
Energy Consumption ◽  
Sensor Networks ◽  
Time Synchronization ◽  
State Of The Art ◽  
Wireless Sensor ◽  
Broad Area ◽  
Energy Consumption Analysis ◽  
Consensus Time ◽  
Synchronization Accuracy

Wireless Sensor Networks (WSNs)  have received considerable attention in recent years because of its broad area of applications. In the same breadth, it also faces many challenges. Time synchronization is one of those fundamental challenges faced by WSN being a distributed system. Several approaches have been proposed in the last decade for time synchronization in WSNs. Recently, Consensus Time Synchronization (CTS) approaches are gaining popularity due its computational lightness, robustness and distributed nature. Though a rich set of CTS algorithms are proposed, their energy consumption has so far not been studied. Apart from synchronization precision, energy consumption should also be considered meticulously for time synchronization algorithms in energy-constraint WSNs. In this paper, a thorough energy consumption analysis is presented for some recent state-of-the-art CTS algorithms for WSN and tested by simulation. The simulation results will help in selecting an appropriate CTS algorithm that meets the requirements of synchronization accuracy and energy consumption for a specific WSN application.

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