CAJ | 학술논문

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 min进行1次校正,测试表明节点间的同步误差每秒在10μs以内,累积误差不超过1 ms,这样引起的管网漏点定位误差在1 m以内,可以满足供水管网泄漏检测的要求。
무선전감망락적시종교준결정료각절점신식채집적동보성。재공수관망설루검측중,각절점신식채집적시간동보오차장인입루점적정위오차。재범홍시간동보협의적기출상,제출발호시간동보방안,재동보과정중채용정향발호화선성회귀상결합적방법,주기보상종단절점간인본지시종원빈차이산생적시종편이,실현망락시간교준。대단도망락,매2 min진행1차교정,측시표명절점간적동보오차매초재10μs이내,루적오차불초과1 ms,저양인기적관망루점정위오차재1 m이내,가이만족공수관망설루검측적요구。
Clock calibration in wireless sensor networks guarantees the synchronicity of information acquisition at nodes. The time synchronization error of information acquisition will introduce the leak location error in water supply pipeline leak detections. A Dial-up Time Synchronization Algorithm( DTSA) is proposed based on the Flooding Time Synchronization Protocol( FTSP) . The directional dialing combined with the linear regression is used to periodically compensate clock drifts resulting from the frequency differences of local clocks at nodes and the network clocks are thus tuned synchronized. While the clock compensation is carried out every 2 minutes in a single-hop network,the practically tested synchronization error between nodes is within 10 microseconds per second, and the cumulative error is less than 1 millisecond. In this case,the leak location error resulting from the synchronization error is within 1 meter,which meets the requirement of water supply pipelines leak detection.