上海航天
上海航天
상해항천
AEROSPACE SHANGHAI
2012年
2期
61-64,72
,共5页
卫星导航%时间同步%Shewhart控制图%CUSUM控制图%平均运行长度%Markov链
衛星導航%時間同步%Shewhart控製圖%CUSUM控製圖%平均運行長度%Markov鏈
위성도항%시간동보%Shewhart공제도%CUSUM공제도%평균운행장도%Markov련
Satellite navigation%Time synchronization%Shewhart control chart%CUSUM control chart%Average run length%Markov chain
为更好地对卫星导航系统时间同步进行监测,基于Shewhart算法和CUSUM算法的特点,提出了一种Shewhart-CUSUM组合算法。改变状态转移概率,获得小于CUSUM算法的平均运行长度（ARL）。三种算法的关键性能指标ARL比较和实测数据的验证结果表明：在选择合适的参数后,组合算法能有效检测时间同步数据异常。
為更好地對衛星導航繫統時間同步進行鑑測,基于Shewhart算法和CUSUM算法的特點,提齣瞭一種Shewhart-CUSUM組閤算法。改變狀態轉移概率,穫得小于CUSUM算法的平均運行長度（ARL）。三種算法的關鍵性能指標ARL比較和實測數據的驗證結果錶明：在選擇閤適的參數後,組閤算法能有效檢測時間同步數據異常。
위경호지대위성도항계통시간동보진행감측,기우Shewhart산법화CUSUM산법적특점,제출료일충Shewhart-CUSUM조합산법。개변상태전이개솔,획득소우CUSUM산법적평균운행장도（ARL）。삼충산법적관건성능지표ARL비교화실측수거적험증결과표명：재선택합괄적삼수후,조합산법능유효검측시간동보수거이상。
To monitor the time synchronization data for the satellite navigation better,a novel Shewhart-CUSUM combined algorithm was put forward based on the characteristics of Shewhart control chart and CUSUM control chart in this paper.The average run length（ARL） gained by the combined algorithm through changing the state transition probabilities was shorter than that of CUSUM algorithm.The ARL comparison of the three algorithms and the veritification results of the real data showed that the both burst and continuous shifts could be detected by the combined algorithm effectively after the parameters selected properly.
