摘要
结合定位卫星实际的应用背景,提出一种用三个性能相近的原子钟组成卫星时间系统的方法,用于自主检测主时钟的误差并实现时钟的备份。将原子钟的时差数据分为确定性部分和随机性部分,用修正的最小二乘法来监测确定性部分,用哈达玛方差来监测随机性部分。仿真结果验证方法能在较短时间内给出主时钟的误差与故障预报,当在轨卫星无法与地面参考时钟进行比对时,具有重要的应用价值。
Under the background of positioning satellite's practical application,this paper proposes a new method which uses three atomic clocks with approximate performance to build a timing system for the satellite to autonomously detect the deviation of the main clock and realize the clock backup.The time deviation of atomic clock can be modeled by a deterministic part and a random part.The modified least square method is used to detect the deterministic part and the Hadamard variance is adopted to detect the random part.Simulation results prove that this method can give the error prediction of the main clock in short time,which is significant when the satellite on orbit can't match up the time system on ground.
出处
《遥测遥控》
2013年第2期24-28,34,共6页
Journal of Telemetry,Tracking and Command
关键词
原子钟
误差检测
最小二乘
哈达玛方差
噪声模型
Atomic clock
Error detection
Least Square
Hadamard variance
Noise model
