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为了提高基于双Mach-Zehnder干涉(DMZI)原理的分布式光纤传感系统的性能,提出一种基于零电平处信号导数分析的快速定位算法。利用信号在零电平处的导数大小,提取信号中最高频率附近的一段进行时延估计,进而获得扰动发生位置。由于提取信号的频率和带宽相对较大,因此系统的定位误差较小。与离散小波提取起始点信号相比,本文算法能够适应更多的扰动事件类型,且由于离散信号导数计算的复杂度远低于离散小波的傅里叶变换,运算时间大幅降低,提高了系统的实时性。实验结果表明,本文算法在10M/s采样率下,最大定位误差为20m,而且计算时间少于0.13s。
In order to improve the performance of distributed optical fiber sensing system based on the double Mach-Zehnder interference (DMZI) principle, a fast location algorithm based on signal derivative analysis at zero level is proposed. Using the derivative of the signal at zero level, the delay estimation is extracted from a section near the highest frequency in the signal to obtain the location of the disturbance. Due to the extracted signal frequency and bandwidth is relatively large, so the system positioning error is small. Compared with discrete wavelet extraction of the initial point signal, the proposed algorithm can adapt to more types of perturbation events. Since the computational complexity of discrete signal derivatives is much lower than that of discrete wavelet transform, the computational time is greatly reduced, real-time. The experimental results show that the maximum error of this algorithm is 20m at the sampling rate of 10M / s, and the calculation time is less than 0.13s.