面向航天器测试的时序数据模式表示方法研究

摘要

通过计算某一点与其左右两相邻点斜率的比值确定出变化点,连接这些变化点,就得到一种基于斜率变化阈值的时间序列分段线性STC表示算法.来自航天器不同分系统的真实数据集实验表明,使用STC算法作为航天器测试时间序列的模式表示方法,与其他分段线性表示算法相比,该方法具有算法简单、拟合程度高和适应能力强的特点.%This paper proposed a method of piecewise linear representation of time series based on slope change threshold (SCT). The algorithm calculated the two segments' slope ratio of the certain point connecting with the two adjacent points and then it combined the points with the line orderly. Detailed experiments on real datasets from various subsystems of spacecraft show that STC ,as the selected method ,is simpler, has a higher degree of fitting and stronger adaptability than other methods of piecewise linear representation.