Decentralized system identification using stochastic subspace identification for wireless sensor networks

Soojin Cho, Jong Woong Park, Sung Han Sim

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Wireless sensor networks (WSNs) facilitate a new paradigm to structural identification and monitoring for civil infrastructure. Conventional structural monitoring systems based on wired sensors and centralized data acquisition systems are costly for installation as well as maintenance. WSNs have emerged as a technology that can overcome such difficulties, making deployment of a dense array of sensors on large civil structures both feasible and economical. However, as opposed to wired sensor networks in which centralized data acquisition and processing is common practice, WSNs require decentralized computing algorithms to reduce data transmission due to the limitation associated with wireless communication. In this paper, the stochastic subspace identification (SSI) technique is selected for system identification, and SSI-based decentralized system identification (SDSI) is proposed to be implemented in a WSN composed of Imote2 wireless sensors that measure acceleration. The SDSI is tightly scheduled in the hierarchical WSN, and its performance is experimentally verified in a laboratory test using a 5-story shear building model.

Original languageEnglish
Pages (from-to)8131-8145
Number of pages15
Issue number4
StatePublished - 8 Apr 2015


  • Decentralized processing
  • Stochastic subspace identification
  • Structural health monitoring
  • System identification
  • Wireless sensor


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