为了解决分布式光纤振动传感系统中多点同时扰动情况下扰动点定位和扰动时间难以判断的问题, 采用信号处理方法, 应用聚类分析技术, 对系统生成的热点图先做阈值处理, 提取目标对象, 依聚类分析的结果, 对扰动点进行定位和扰动时间加以确认。结果表明, 该方法在排除噪声干扰的同时, 较为准确、合理地对扰动行为的位置和扰动持续时间做出了判断。这属于事件等级划分的一个步骤, 该研究为最终系统报警策略的规划提供了依据。

To solve the problem that it is difficult to position the perturbation point and judge the perturbation time under multiple simultaneous perturbations in a distributed optical fiber vibration sensing system, signal processing method was carried out and clustering analysis technology was applied. Firstly, hotspot map gathered by the system was processed above a threshold, and then the target objects were extracted. According to the results of clustering analysis, perturbation points are positioned and perturbation time is confirmed. The results show that the method makes an accurate and reasonable judgment for positioning the perturbation behavior and perturbation duration and the noise interference is eliminated at the same time. This is one step of event classification. The study provides the basis for the final system alarm strategy.