应用和准确性分析BDS-3完全操作星座的原始单向卫星间链路观测结果
Jie Li1, Jun Zhu2, Rengui Ruan3
1State Key Laboratory of Astronautic Dynamics, Xi'an, Shanxi, China.
Scientific reports
|April 25, 2025
概括
卡频段卫星间连接 (ISL) 能够为北斗导航卫星系统 (BDS-3) 准确地确定轨道和时间同步. 这项研究验证了ISL的准确性,并确定了影响性能的因素,改进了卫星导航系统.
科学领域:
- 卫星导航系统 卫星导航系统
- 轨道的确定 轨道的确定
- 时间同步 时间同步
背景情况:
- 北斗导航卫星系统 (BDS-3) 使用Ka频段卫星间连接 (ISL) 作为一种创新的测量技术.
- ISL补充了传统的L频段地面卫星跟踪,用于轨道确定 (OD) 和时间同步 (TS).
- 本研究使用原始单向ISL数据为整个BDS-3星座提供了第一个OD和TS.
研究的目的:
- 通过使用Ka频段卫星间连接 (ISL) 对整个BDS-3星座进行轨道确定和时间同步.
- 估计ISL硬件延迟 (Ka-bias) 等关键参数,并得出长期平均解决方案.
- 验证OD和TS能力,特别是对于像GEO C61.1.这样的专业卫星.
主要方法:
- 采用正常方程 (NEQ) 积累技术进行参数估计.
- 为异质的ISL数据开发了一个扩展的观测模型,包括专门的GEO卫星C61.
- 通过使用单向ISL数据对GEO C61进行验证的OD和TS.
主要成果:
- 在ISL支持下实现了8.0厘米 (MEOs),11.6厘米 (IGSOs) 和24.0厘米 (GEO) 的轨道精度.
- 对于GEO C61的验证OD精度是:~3.7厘米 (辐射),~7.9厘米 (正常),~27.7厘米 (触角),~29.0厘米 (3D).
- 实现TS精度~0.1 ns;Ka-bias精度~0.2 ns,观察到的跳跃归因于L频段延迟,而不是原子钟.
结论:
- 卡频段ISL为BDS-3轨道确定和时间同步提供了高精度.
- 区分L频段和ISL硬件延迟跳跃,澄清卫星时钟的行为.
- 确定了与天线/接收器变化相关的单向ISL中的周期性残留物,对观测建模有价值.
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