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无线传感网络的时钟校准决定了各节点信息采集的同步性。在供水管网泄漏检测中,各节点信息采集的时间同步误差将引入漏点的定位误差。在泛洪时间同步协议的基础上,提出拨号时间同步方案,在同步过程中采用定向拨号和线性回归相结合的方法,周期补偿终端节点间因本地时钟源频差而产生的时钟偏移,实现网络时间校准。对单跳网络,每2分钟进行1次校正,测试表明节点间的同步误差每秒在10微秒以内,累积误差不超过1毫秒,这样引起的管网漏点定位误差在1米以内,可以满足供水管网泄漏检测的要求。
Wireless sensor network clock calibration determines the synchronization of information collection nodes. In the water supply network leak detection, the time synchronization error of each node information acquisition will introduce the positioning error of the leak point. On the basis of flood time synchronization protocol, a dial-up time synchronization scheme is proposed. In the process of synchronization, a combination of directional dialing and linear regression is used to periodically compensate for the clock offset caused by the local clock source frequency offset between the end nodes Network time calibration. For single-hop networks, calibration is performed every 2 minutes. The test shows that the synchronization error between nodes is within 10 microseconds per second and the accumulated error is less than 1 millisecond. This causes the error of the network leakage location within 1 meter, Meet the water supply network leak detection requirements.