摘要
基于低轨导航增强星座建立空基时间基准时,需要指定不同于地面时间基准所建立的频率驾驭策略;围绕频率驾驭策略的选取,分别介绍了阻尼系数、反馈钟差或调频信息和模型预测控制(MPC)3种频率驾驭算法,利用仿真试验分析了它们的优缺点.结果表明:阻尼系数法调节频次低,适用于地面注参数的调节模式;反馈钟差或调频信息法调节频次高,适用于星载设备自主调节;模型预测控制法因其可调参数多,可以得到相对更高的频率稳定度,但操作方法相对复杂.几种算法均可通过适当调节流程以满足当前低轨卫星频率驾驭的精度要求.
Time reference established by navigation system needs to synchronize with ground time,which requires the use of frequency steering algorithm.Several frequency steering algorithms are examined in this paper,advantages and disadvantages of damping coefficient method,feedback clock difference measurement or frequency adjustment information method,and model predictive control(MPC)method are analyzed.The damping coefficient method has a low frequency of adjustment and is suitable for ground injection operation.Adjustment frequency of feedback clock difference or frequency adjustment information method is high,which is suitable for autonomous adjustment of space-borne equipment.The model predictive control algorithm has many adjustable parameters and can obtain higher frequency stability,but operation method is complicated.These algorithms can meet the requirement of frequency control accuracy of low orbit satellites by proper adjustments.
作者
陈广耀
邢楠
CHEN Guangyao;XING Nan(Department of Astronomy,Beijing Normal University,100875,Beijing,China;Shanghai Key Laboratory of Space Navigation and Positioning Techniques,200030,Shanghai,China)
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第3期370-376,共7页
Journal of Beijing Normal University(Natural Science)
基金
国家自然科学基金资助项目(12021003)
关键词
卫星导航系统
频率驾驭算法
低轨增强
模型预测控制算法
navigation satellite system
frequency steering algorithm
low earth orbit constellation augmentation
model predictive control algorithm
