西安电子科技大学学报（自然科学版）2024，Vol.51Issue(3)：19-29,11.DOI:10.19665/j.issn1001-2400.20231207
无人机平台运动状态下节点间高精度时间同步
High precision time synchronization between nodes under motion scenario of UAV platforms
摘要
Abstract
Time synchronization is the foundation for transmission resource scheduling,cooperative localization and data fusion in UAV clusters.Two-way time synchronization is commonly used to synchronize time between nodes in scenarios with high synchronization accuracy requirements.However,the relative motion of the UAVs will cause the propagation delays of the two synchronization messages to be unequal,thereby causing time synchronization errors.To solve this problem,the causes of synchronization deviation are analyzed from the perspective of solving linear equations.A method is proposed to increase the number of equations by conducting two-way time synchronization twice,with the number of unknown quantities being reduced under the premise of the uniform motion of nodes.The solution formula for the clock deviation under uniform motion of nodes is derived,and the derivation results show that the clock deviation solution is independent of the speed of the nodes.Synchronization performance is compared with that of existing compensation methods under the additive Gaussian white noise channel.The effect of time stamp deviation and speed changing on the accuracy of the clock deviation solution is analyzed.Finally,the effectiveness of the dual-trigger two-way time synchronization is verified through field experiments.Simulation and experiment results show that,compared with conventional two-way time synchronization,the dual-trigger two-way time synchronization does not cause systematic deviations by the uniform motion of nodes.关键词
无人机/双向时间同步/非对称传输时延/线性方程组Key words
unmanned aerial vehicles/two-way time synchronization/asymmetric transmission delay/linear equations分类
信息技术与安全科学引用本文复制引用
陈聪,段柏宇,徐强,潘文生,马万治,邵士海..无人机平台运动状态下节点间高精度时间同步[J].西安电子科技大学学报（自然科学版）,2024,51(3):19-29,11.基金项目
国家自然科学基金(U19B2014,62071094,61901396) （U19B2014,62071094,61901396）
