基于稳健回归的TTE时钟补偿算法  

Clock compensation scheme based on robust regression in TTE

作　　者：张英静[1] 何锋[1] 卢广山[1] 熊华钢[1] 

机构地区：[1]北京航空航天大学电子与信息工程学院,北京100191

出　　处：《系统工程与电子技术》2017年第10期2165-2170,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61301086);国家留学基金资助课题

摘　　要：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。Via accurate time scheduling, time-triggered ethernet （TTE） ensures real-time data communica tion and satisfies the transmission requirements of some critical safety systems in the fields of avionics technology, transportation, industrial automation and so on. However, existing standards just discuss the clock synchronization procedure and does not give a solution to the clock compensation problem. Considering the feature of clock synchronization in TTE, a clock compensation algorithm based on the robust regression method is pro- posed. The proposed algorithm robustly evaluates the clock skews of local clocks and compensates it, which eliminates the clock jump problem of traditional direct compensation and impacts from outliers in the network. The simulation results show that clock synchronization precision of the algorithm in this paper outperforms di- rect compensation and non-robust least square compensation as long as the ratio of outliers in the network is no more than 50%.

关 键 词：时间触发以太网 时钟补偿 稳健回归 时钟同步精度 

分 类 号：V21[航空宇航科学与技术—航空宇航推进理论与工程]