对天然气管道清管作业存在的跟踪定位偏差问题进行分析，发现清管器运行时与管壁产生明显的摩擦振动,尤其是管道接头、焊缝和拐点处。振动作用会传导至管道同沟敷设的光纤上,当光纤某处收到振动时,该处折射率发生变化,导致该处相位改变,将两个时刻的后向瑞利散射曲线相减即可检测和定位振动信号,基于相位敏感光时域反射原理,提出了采用分布式光纤振动传感实时跟踪定位的方法。经宣宁线齐河至长清至泰安段管道清管作业实测,定位性能良好,验证了方法的有效性。分布式光纤振动传感实时跟踪定位方法可实现清管器实时跟踪定位，降低清管器丢失卡堵造成管线停输的事故风险，对清管作业顺利完成具有一定借鉴意义。

To address the issue of deviation in tracking and positioning of the pig during pigging of natural gas pipeline, an analysis was done on the obvious frictional vibration between the pig and the pipe wall, especially at the pipe joints, welds and inflection points. Such vibration will be detected by the optical fiber in the same pipe trench. When vibration is detected at a certain location of the optical fiber, the refractive index changes, resulting in a phase change at that location. The location of that external vibration can be detected by calculating the difference between the two Backward Rayleigh Scattering Curves from that two moments. Based on the principle of phase-sensitive optical time-domain reflection, a method of real-time tracking and positioning using distributed optical fiber vibration sensing is proposed. The pigging operation at Qihe-Changqing-Taian section of Xuanning line using this technology shows that the pig positioning performance is good, and hence verifies the effectiveness of the method. This method enables the real-time tracking and positioning of the pig, thereby reduce the risk of pipeline shut-down due to blockage by or loss of the pig. This is a good reference for executing successful pigging operations.