To meet the special requirements of time synchronization for structural health monitoring based on wireless sensor networks, this paper proposed an improved FTSP time synchronization algorithm to exclude the disturbance of the outliers. The algorithm determines the weight values according to the regression residuals. Using those weights, an ordinary least square method based on iteratively re-weighted is applied to estimate the regression coefficients, which can reduce outliers' negative impact on the parameter estimates. Compared with the original FTSP protocol, the results show that the proposed algorithm can effectively eliminate the interference of outliers and improve the accuracy of time synchronization. Meanwhile, the time synchronization error is controlled in microsecond, which can meet time synchronization requirements in structural health monitoring.
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 email@example.com
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 firstname.lastname@example.org