封闭环境下管网泄漏信号的多点同步采样系统

Multi-nodes synchronous sampling system for pipeline-net leak signal in enclosed space

为了实现封闭环境下管网泄漏信号的多点同步采样，设计了一种基于无线传感网络的多节点同步采样系统。利用XBee无线通信模块构建数据传输网络，广播时间信息并实现数据的无线传输。STM32F407数据采集单元基于串行通信和内部DMA方式的数据采集功能，以接收信号强度指示值作为同步触发信号实现多节点同步采样与定时器校正。采用错时发送机制，避免多节点数据同时发送导致网络拥堵和数据丢包。实验结果表明：系统数据传输稳定可靠、授时精度高、定位准确，为封闭环境下管网泄漏信号的同步采集提供了一种有效的技术手段。

A multi-nodes synchronous sampling system work in enclosed space is design based on wireless sensor network. The wireless data transmission network is created by XBee to broadcast time information and wireless data transmission. The Received Signal Strength Indicator （RSSI） signal is used as synchronous trigger signal, combine with the STM32F407 serial communication and internal DMA data acquisition to realize the timer correction and multi- nodes synchronous sampling. Time-difference backoff is adopted to avoid network congestion and data loss. The analysis and experiments show that the system is stable and reliable, high precise time synchronization and leak positioning accuracy is high, it provides an effective technological means for synchronous sampling system in enclosed space.