面向结构健康监测的改进FTSP算法设计

针对无线传感器网络桥梁结构健康监测同步精度低的问题,采用迭代加权最小二乘法估计及补偿时钟漂移,设计了一种基于帧首定界符(SFD)硬件捕获机制的改进泛洪时间同步算法(FTSP),并与经典FTSP算法进行对比研究。根据桥梁结构,选用线性链状网络拓扑结构,在CC2530硬件平台上测得单跳网络平均同步误差为3. 148μs,3跳网络平均同步误差为9. 167μs。试验结果表明,改进FTSP算法有效地解决了发送延迟、访问延迟、接收延迟,以及异常数据对时间同步精度及稳定性影响的问题,是一种满足桥梁结构健康监测应用的高精度、高稳定性时间同步算法。

Design of Improved FTSP Algorithm for Structural Health Monitoring

In order to solve the problem of low synchronization accuracy of bridge structure health monitoring in wireless sensor networks, an improved flooding time synchronization protocol( FTSP) based on the hardware capture mechanism of start of frame delimiter(SFD) was designed by using the iteratively reweighted least squares method estimated and compensated clock drift, and it was compared with the classical FTSP algorithm.According to the bridge structure, the linear chain network topology was selected. On the CC2530 hardware platform, the average synchronization error of the single-hop network was 3. 148 μs, and the average synchronization error of the 3-hop network was 9. 167 μs. The experimental results show that the improved FTSP algorithm can effectively solve the problems of transmission delay, access delay, reception delay and the effect of abnormal data on time synchronization accuracy and stability. It is a high-precision and high-stability time synchronization algorithm that satisfies the application of bridge structure health monitoring.