The signal processing methods related to Ф-OTDR fiber monitoring system are unable to analyze the signal characteristics in terms of signal generation and propagation. These models lack the correspondence between the disturbance event parameters and the fiber structure parameters and cannot quantify the characteristics. Moreover, the signal processing methods are not targeted, and the accuracy of pattern recognition is low. In this work, we establish a complete theoretical model for the intrusion signal propagation process of the buried pipeline Ф-OTDR optical fiber monitoring system. The proposed model takes the signal generation, propagation in the medium to the optical fiber, and the entire process of the variations in light intensity in the optical fiber into consideration. The accuracy of the proposed model is verified by comparing the acquired field vibrations with simulation results. The results presented in this work provide a complete theoretical framework for the signal analysis and processing methods of the Ф-OTDR optical fiber monitoring system. Moreover, it also provides ideas for the study of pattern recognition algorithms.

Ф-OTDR光纤监测系统相关的信号处理方法无法从信号产生和传播方面分析信号特征。这些模型缺乏扰动事件参数与纤维结构参数之间的对应关系，无法量化特征。而且，信号处理方法没有针对性，模式识别准确率低。在这项工作中，我们为埋地管道Ф-OTDR光纤监测系统的入侵信号传播过程建立了完整的理论模型。所提出的模型考虑了信号的产生、介质中到光纤的传播以及光纤中光强变化的整个过程。通过将获得的场振动与仿真结果进行比较，验证了所提出模型的准确性。研究结果为Ф-OTDR光纤监测系统的信号分析和处理方法提供了完整的理论框架。此外，它还为模式识别算法的研究提供了思路。