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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.
A time synchronization (CCS-Sync) algorithm based on chirp signal is proposed to improve the time synchronization performance of underwater sensor networks. At the physical layer, a preamble structure combined with chirp signals is used to estimate the Doppler scale factor. Furthermore, a new information exchange mechanism consisting of two phases is proposed.In the coarse synchronization phase, beacon nodes synchronize common nodes by broadcasting.On the basis of this, the synchronization mechanism estimates the phase and frequency of the clock by 2-linear regression By this algorithm, the Doppler effect of the mobile node can be used to reduce the synchronization error, and the simulation experiment proves the good performance of the CCS-Sync algorithm.