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时间触发以太网(time-triggered ethernet,TTE)通过精确的时间调度,保证了通信数据的实时性传输,满足了航空电子、运输及工业自动化等众多领域中关键安全系统的传输要求。然而,现有的TTE标准虽然规定了时间触发以太网的时钟同步流程,但未对时钟补偿问题给予具体解决方法。针对TTE的时钟同步特点,提出了一种基于稳健回归的时钟同步补偿方法。通过稳健回归算法对时钟误差进行估计,再根据估计误差对各节点的本地时钟进行补偿,所提出的算法成功解决了传统时钟补偿方法导致的时钟跳变和野值影响的问题。仿真结果也证实了,在野值比例不大于50%的情况下,所提算法在时钟同步精度方面明显优于传统的直接补偿算法和无稳健性的最小二乘补偿算法。
Time-triggered ethernet (TTE) ensures the real-time transmission of communication data through accurate time scheduling and meets the transmission requirements of key security systems in many fields such as avionics, transportation and industrial automation. However, although the existing TTE standard specifies the clock synchronization process of time-triggered Ethernet, no specific solution is given to the problem of clock compensation. Aiming at the characteristics of TTE clock synchronization, a clock synchronization compensation method based on robust regression is proposed. The robust regression algorithm is used to estimate the clock error, then the local clock of each node is compensated according to the estimation error. The proposed algorithm successfully solves the problem of clock transition and outliers caused by the traditional clock compensation method. The simulation results also confirm that the proposed algorithm outperforms the traditional direct compensation algorithm and unsteady least-squares compensation algorithm in terms of clock synchronization accuracy when the ratio of outliers is not more than 50%.