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在LEO-PNT中精确地确定轨道的T-RAIM
Ciro Gioia1, Francesco Menzione1, Andrea Piccolo1
1European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy.
Sensors (Basel, Switzerland)
|December 11, 2025
概括
本研究介绍了定时接收器自主完整性监测 (T-RAIM) 以提高低地球轨道位置,导航和定时 (LEO-PNT) 系统. 通过减轻级联故障和在GNSS中断期间保持准确度,T-RAIM确保了可靠的PNT服务.
科学领域:
- 太空工程 太空工程
- 卫星导航系统 卫星导航系统
- 信号处理 信号处理
背景情况:
- 低地轨道位置,导航和定时 (LEO-PNT) 星座的快速发展为全球导航卫星系统 (GNSS) 提供了增强.
- 低极点和GNSS层之间的相互依赖性可能会导致级联故障,影响系统可靠性.
- 太空中接收器需要强大的完整性监控,以确保连续的PNT服务.
研究的目的:
- 通过将接收器自主完整性监控 (RAIM) 功能扩展到太空接收器来减轻与LEO-GNSS相互依赖相关的风险.
- 为了验证时间接收器自主完整性监测 (T-RAIM) 与精确实时机上轨道确定 (P2OD) 在LEO环境中的集成.
- 确保LEO-PNT解决方案的持续系统功能,并防止服务中断.
主要方法:
- 实施一个硬件在循环测试环境,用于LEO场景.
- 整合T-RAIM与用于太空接收器的先进P2OD技术.
- 在模拟的GNSS时钟故障和伪范围道错误下验证拟议的架构的性能.
主要成果:
- 尽管GNSS时钟出现故障,但T-RAIM集成架构仍然保持了名义定位和定时精度.
- 在不需要P2OD重启的情况下实现了连续的系统功能,防止了服务中断.
- T-RAIM有效地减轻了伪范围的坡道错误,保持了时钟偏差的完整性和轨道确定精度.
结论:
- 拟议的T-RAIM集成为LEO-PNT系统提供了可行的和强大的解决方案,处理空间接收器的计算需求.
- 这种方法提高了LEO-PNT解决方案的抗级联断层和GNSS信号退化的弹性.
- 该研究表明,T-RAIM在未来太空导航系统中确保可靠和连续的PNT服务方面发挥了关键作用.
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