结合啁啾信号的水下传感器网络时间同步算法

A Combined Chirp Signal Time-Synchronization Scheme for Mobile Underwater Sensor Networks

提出了一种结合啁啾信号时间同步(CCS-Sync)算法,以提高水下传感器网络时间同步性能.在物理层,使用一种结合啁啾信号的序文结构来估计多普勒规模因子.更进一步,提出一个新的由2个阶段组成的信息交换机制.在粗同步阶段,信标节点通过广播去同步普通节点.在此基础上,同步机制通过2次线性回归来估计时钟相位和频率频移.通过这种算法,可以利用移动节点的多普勒效应来减少同步误差,而且仿真实验证明了CCS-Sync算法的良好性能.

This article puts forward a combined chirp signal time synchronization（ CCS-Sync） algorithm.In the physical layer,it uses a preamble structure combined with chirp signals to estimate the Doppler scaling factor. Furthermore,the author proposes a message exchange mechanism composed of two phases. In the phase of coarse synchronization,the reference node broadcasts messages to synchronize the ordinary nodes. Based on the first phase,it uses twice linear regression method to estimate the clock skew and offset. With this algorithm,it successfully uses the effect of Doppler between mobility nodes to reduce the synchronization error. The effectiveness of CCS-Sync is validated by the simulation.