Publications / 2011 Proceedings of the 28th ISARC, Seoul, Korea

High Efficient Synchronization-On-Demand Protocol of IEEE802.15.4 Wireless Sesnor Network for Construction Monitoring

Ji-De Huang, Wen-Jong Wu, Jen-Yu Han, Hui-Ping Tserng, Chih-Ting Lin
Pages 1370-1375 (2011 Proceedings of the 28th ISARC, Seoul, Korea, ISBN 978-89-954572-4-5, ISSN 2413-5844)
Abstract:

The Wireless Sensor Network (WSN) technology has been employed in the field of civil engineering especially in structural monitoring and construction safety. To be used in construction safety, the time-synchronization within the sensor network is required to obtain important correlations between events, such as the prevention of equipment collisions. In this work, a high efficient time synchronization method is developed for the ultra-precise localization system to prevent collision accident in construction sites. Without interfering the operation of the whole sensor network, the developed protocol can locally synchronize several nodes within 10ms. By measuring the time uncertainty information through the time stamping, wireless sensor nodes can be synchronized with only two transmitted packages from the beacon or specific nodes. Based on this proposed approach, 0.8 micro-seconds synchronization error was experimentally achieved on an IEEE802.15.4 platform. By employing the developed method, the localization system is implemented and experimentally examined to have the accuracy within several cm in the range of 2m. This system can be used to prevent the collision between construction equipments. Therefore, this work demonstrated a simple and efficient approach to obtain good accuracy, low communication overhead, and robust synchronization for most wireless sensor network platforms to be used in automated monitoring in constructions.

Keywords: Wireless sensor network, synchronization, ultrasonic localization, Anti-collision system