摘要
针对电力电网高精度的实时定位导航和授时的相关应用对卫星导航系统原子钟钟差连续性的依赖,提出了卡尔曼新息外推的原子钟钟差实时异常检测算法。该方法将之前的状态预测值递推到当前时刻,避免了异常值的影响,可更有效地检测微小的原子钟钟差异常。仿真结果表明,相较于卡尔曼新息检测法,所提出的方法提高了原子钟钟差异常的检测概率,缩短了检测时间。当铯原子钟钟差跳变0.5 ns时,恒虚警概率P_(fa)=10^(-5)下,检测时间仅需5 s,检测概率为0.9998,相较于新息检测法提高了66.3%,实现了实时且高性能的原子钟钟差异常检测。
Aiming at the dependence of high precision real-time positioning navigation and timing application on the continuity of atomic clock difference in satellite navigation system,a real-time anomaly detection algorithm of atomic clock difference based on Kalman innovation extrapolation is proposed.In this method,the predicted value of the previous state is extrapolated to the current time,avoiding the influence of outliers and more effectively detecting the tiny anomaly in atomic clocks.The simulation results show that compared with Kalman innovation method,the detection probability is improved and the detection time is shortened.When the clock difference of cesium atomic clock is changed by 0.5 ns,with a constant false alarm probability of 10-5,the detection time is only 5 s with the detection probability of 0.9998,which is 66.3%higher than that of the Kalman innovation method,realizing the real-time and high-performance anomaly detection of atomic clock difference.
作者
鄢然
田永和
许文
YAN Ran;TIAN Yonghe;XU Wen(Zhejiang Saisi Electronic Technology Co.,Ltd.,Jiaxing 314006,China)
出处
《测控技术》
2023年第8期44-49,55,共7页
Measurement & Control Technology
基金
国家自然科学基金面上项目(12073033)。
关键词
钟差异常
原子钟
卡尔曼
新息外推
anomaly of clock difference
atomic clock
Kalman
innovation extrapolation
