摘要
目前光纤扰动监测系统的定位算法以互相关为主,存在定位精度低、实时性差和稳定性不够的问题。基于上述现象,研究并运用最小均方(LMS)算法和线性插值原理,设计出一种精度高、实时定位的光纤扰动定位系统。检测光路采用双马赫-曾德尔分布式干涉结构,定位算法以两段式步长调整的LMS时延估计为主,对LMS估计结果的差分进行线性插值能额外提高定位精度,定位算法的实现和数据处理在FPGA内进行。多次光纤敲击实验表明:系统响应时间在0.45s左右;在采样率为10MHz的条件下,系统定位精度达到±6m,且较为稳定可靠。
At present, the positioning algorithm of optical fiber disturbance monitoring system is mainly cross-correlation, which has the problems of low positioning accuracy, poor real-time performance and insufficient stability. Based on the above phenomena, an optical fiber disturbance positioning system with high accuracy and real-time location is designed by studying and applying least mean square(LMS) algorithm and linear interpolation principle. Double Mach-Zendel distributed interference architecture is used in the detection optical path. The location algorithm is mainly based on LMS time delay estimation with two-stage step adjustment. Linear interpolation of the difference between LMS estimation results can improve positioning accuracy. The implementation of localization algorithm and data processing are carried out in the FPGA. Multiple fiber tapping experiments show that the system response time is around 0.45s. Under the condition of sampling rate of 10MHz, the system positioning accuracy reaches ±6m, which is relatively stable and reliable.
作者
刘仁华
罗义军
LIU Renhua;LUO Yijun(Electronic Information School,Wuhan University,Wuhan 430072,China)
出处
《光通信技术》
北大核心
2019年第4期58-62,共5页
Optical Communication Technology
关键词
变步长LMS
线性插值
FPGA
光纤扰动定位
variable step size LMS
linear interpolation
FPGA
optical fiber disturbance location
