[1] [1] WANG Li. Research on intelligent technology of environment perception based on distributed optical fiber sensor［D］. Tianjin: Nankai University,2008.

[2] [2] HOFFMAN P R, KUZYK M G. Position determination of an acoustic burst along a sagnac interferometer［J］. Journal of Lightwave Technology, 2004, 22(2): 494-498.

[3] [3] LIU Bo, YANG Yi-fei, ZHANG Jian, et al. A fiber fence system based on M-Z interferometer［J］. Acta Photonica Sinica, 2007, 36(6): 1013-1017.

[4] [4] ZHANG Ying, CHEN Jia-mei, LI Gang, et al. Location method of distributed fiber-optic perimeter security system based on Mach-Zehnder interferometer［J］.Chinese Journal of Lasers, 2012, 39(06): 112-115.

[5] [5] MA Chun-yu, LIU Tie-gen, LIU Kun, et al. Long-range distributed fiber vibration sensor using an asymmetric dual Mach-Zehnder interferometers ［J］. Journal of Lightwave Technology, 2016, 34(9): 2235-2239.

[6] [6] MA Chun-yu, LIU Tie-gen, LIU Kun, et al. A continuous wavelet transform based time delay estimation method for long range fiber interferometric vibration sensor［J］. Journal of Lightwave Technology, 2016, 34(16): 3785-3789.

[7] [7] ZHONG Xiang, ZHANG Chun-xi, LIN Wen-tai, et al. Fiber-optic perimeter location system based on wavelet transformation［J］.Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(3): 396-400.

[8] [8] CHEN Qin-nan, LIU Tie-gen, LIU Kun. An improved positioning algorithm with high precision for dual Mach- Zehnder interferometry disturbance sensing system［J］. Journal of Lightwave Technology, 2015, 33(10): 1954-1960.

[9] [9] TANG Juan, XING Hong-yan. Time delay estimation based on second correlation［J］. Computer Engineering, 2007, 33(21): 265-267.

[10] [10] CHEN Jun. Research on an interferometric optical fiber fence alarm system［D］. Chengdu: University of Electronic Science and Technology of China,2012.

[11] [11] YANG De-sen, SHI Jie, LIU Bo-sheng. Research of time-delay estimation algorithm for passive localization based on cepstrum analysis［J］. Journal of System Simulation, 2009, 21(2): 610-612.

[12] [12] XIE Shang-ran, ZOU Qi-lin, WANG Li-wei, et al. Positioning error prediction theory for dual Mach-Zehnder interferometric vibration sensor［J］. Journal of Lightwave Technology, 2011, 29(3): 362-368.

[13] [13] CESPEDES I, OPHIR J, ALAM S K. The combined effect of signal decorrelation and random noise on the variance of time delay estimation［J］. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 1997, 44(1): 220-225.

[14] [14] COHEN L. Generalizatioof the wiener-khinchin theorem［J］. IEEE Signal Processing Letters, 1998, 5(11): 292-294.