Chaofan Wang
Chu Luo
Vassilis Kostakos
ABSTRACT
A major challenge in human activity recognition over long periods with multiple sensors is clock synchronization of independent data streams. Poor clock synchronization can lead to poor data and classifiers. In this paper, we propose a hybrid synchronization approach that combines NTP (Network Time Protocol) and context markers. Our evaluation shows that our approach significantly reduces synchronization error (20 ms) when compared to approaches that rely solely on NTP or sensor events. Our proposed approach can be applied to any wearable sensor where an independent sensor stream requires synchronization.
- David Bannach, Oliver Amft, and Paul Lukowicz. 2009. Automatic Event-Based Synchronization of Multimodal Data Streams from Wearable and Ambient Sensors. In Smart Sensing and Context, Payam Barnaghi, Klaus Moessner, Mirko Presser, and Stefan Meissner (Eds.). Springer Berlin Heidelberg, Berlin, Heidelberg, 135--148. Google Scholar
Digital Library
- John Eidson and Kang Lee. 2002. IEEE 1588 standard for a precision clock synchronization protocol for networked measurement and control systems. In Sensors for Industry Conference, 2002. 2nd ISA/IEEE. IEEE, 98--105.Google ScholarCross Ref
- Elliott Kaplan and Christopher Hegarty. 2005. Understanding GPS: principles and applications. Artech house. Google ScholarDigital Library
- CA Latha and HL Shashidhara. 2010. Clock synchronization in distributed systems. In 2010 5th International Conference on Industrial and Information Systems. IEEE, 475--480.Google ScholarCross Ref
- Dong Li and Prasun Sinha. 2012. Rbtp: Low-power mobile discovery protocol through recursive binary time partitioning. IEEE Transactions on Mobile Computing 13, 2 (2012), 263--273. Google ScholarDigital Library
- Chu Luo, Henri Koski, Mikko Korhonen, Jorge Goncalves, Theodoros Anagnostopoulos, Shin'Ichi Konomi, Simon Klakegg, and Vassilis Kostakos. 2017. Rapid clock synchronisation for ubiquitous sensing services involving multiple smartphones. In Proceedings of the 2017 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2017 ACM International Symposium on Wearable Computers. ACM, 476--481. Google ScholarDigital Library
- D. L. Mills. 1991. Internet time synchronization: the network time protocol. IEEE Transactions on Communications 39, 10 (Oct 1991), 1482--1493.Google ScholarCross Ref
- David L Mills. 2012. Executive summary: computer network time synchronization. University of Delaware, Newark, DE, USA, Tech. Rep (2012).Google Scholar
- Michael Mock, Reiner Frings, Edgar Nett, and Spiro Trikaliotis. 2000. Continuous clock synchronization in wireless real-time applications. In Proceedings 19th IEEE symposium on reliable distributed systems SRDS-2000. IEEE, 125--132. Google ScholarDigital Library
- Prakash Ranganathan and Kendall Nygard. 2010. Time synchronization in wireless sensor networks: a survey. International journal of ubicomp 1, 2 (2010), 92--102.Google ScholarCross Ref
- Pranab Kumar Sen. 1968. Estimates of the regression coefficient based on Kendall's tau. Journal of the American statistical association 63, 324 (1968), 1379--1389.Google ScholarCross Ref
- Bharath Sundararaman, Ugo Buy, and Ajay D. Kshemkalyani. 2005. Clock synchronization for wireless sensor networks: a survey. Ad Hoc Networks 3, 3 (2005), 281 -- 323.Google ScholarCross Ref
- Henri Theil. 1992. A rank-invariant method of linear and polynomial regression analysis. In Henri Theil's contributions to economics and econometrics. Springer, 345--381.Google Scholar
Index Terms
- Improving wearable sensor data quality using context markers
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