[5] [5] LU Chengye,WU Sheng,JIANG Chunxiao,et al.Weak harmonic signal detection method in chaotic interference based on extended Kalman filter ［J］.Digital Communications and Networks,2019,5(1):51-55.

[6] [6] HUANGN E,SHEN Z,LONG S R,et al.The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis［J］.Proceedings of the Royal Society A:Mathematical,Physical and Engineering Sciences,1998(454): 903-995.

[10] [10] JIA H,LOU S,LIANG S,et al.Event identification by FELM model for Φ-OTDR fiber-optic distributed disturbance sensor［J］.IEEE Sensors Journal,2019,20(3):1297-1305.

[12] [12] LYU C,HUO Z,LIU Y,et al.Robust intrusion events recognition methodology for distributed optical fiber sensing perimeter security system［J］.IEEE Transactions on Instrumentation and Measurement,2020(99):1.

[13] [13] KHILAR P M,DASH T.Multifault diagnosis in WSN using a hybrid metaheuristic trained neural network［J］.Digital Communications and Networks,2020，6(1):86-100.