基于数据拟合的信号锁定指示异常跳变检测方法

摘要

To solve the problem of abnormal signal lock indicator of satellite shift in space applications caused by the single-event effects, a satellite signal lock indicator abnormal shifting detection method based on data fitting is proposed. Through fault injection test on the designed case, the frequency distribu-tions of both normal signal lock indicator shift and abnormal signal lock indicator shift are analyzed,and then, the corresponding probability density function is acquired with Curve Fitting Toolbox of MATLAB software. Finally, in accordance with the criterion of maximum posterior probability estimationthe,the best decision threshold in given orbit is calculated. This method is preliminarily verified, and achieves satisfac-tory results in a LEO satellite.%为解决卫星在空间应用过程中由于单粒子效应而发生信号锁定指示异常跳变故障的问题，提出了一种基于数据拟合的卫星锁定指示异常跳变检测方法。通过对设计案例进行故障注入试验，分别统计了卫星信号锁定指示正常跳变和异常跳变的频率分布，并使用MATLAB软件的数据拟合工具得到了相应的概率密度函数，运用最大后验概率准则计算得到了给定轨道的最佳判定门限。该方法已经在某低轨卫星中得到了初步验证，取得了满意的效果。