CAJ | 학술논문

针对当前水下传感器网络中的时钟同步难题，设计了一种三元阵被动定位自主水下航行器（ AUV）模型，并基于此模型提出了AUV辅助的时钟同步（ AUV-Sync）算法。该算法通过AUV与节点之间相对运动过程中进行的信息交换来对节点相对距离进行估计，进而基于相对距离计算单向传播时延来降低由于节点移动性所导致的误差。最后，通过两轮加权最小二乘法进行线性回归来估计时钟同步的参数。仿真结果表明：在存在节点漂移的动态水下传感器网络环境中，该算法较其他相关算法有更高的精度。
침대당전수하전감기망락중적시종동보난제，설계료일충삼원진피동정위자주수하항행기（ AUV）모형，병기우차모형제출료AUV보조적시종동보（ AUV-Sync）산법。해산법통과AUV여절점지간상대운동과정중진행적신식교환래대절점상대거리진행고계，진이기우상대거리계산단향전파시연래강저유우절점이동성소도치적오차。최후，통과량륜가권최소이승법진행선성회귀래고계시종동보적삼수。방진결과표명：재존재절점표이적동태수하전감기망락배경중，해산법교기타상관산법유경고적정도。
Aiming at problem of time synchronization in underwater sensor networks,a model for autonomous underwater vehicle( AUV)based on three-element array passive positioning method is designed. Based on this model,propose an AUV-assisted time synchronization algorithm( AUV-Sync),which estimates relative distance by message exchange in process of relative movement between AUV and sensor nodes,and reduce error caused by nodes mobility by computing one-way propagation delay based on relative distance. By two rounds weighted least squares estimation(WLSE)to perform linear regression to estimate time synchronization parameters. Simulation results show that the AUV-Sync outperforms the existing synchronization algorithms for dynamic underwater sensor networks in precision considering drift of nodes.