Precise autonomous satellite navigation for high alitude and scientific missions

随着未来10年将发射40多项由资金支持的月球任务，以及围绕地球轨道运行的卫星数量迅速增加，对精确可靠的自主导航的需求从未像现在这样强烈。目前的高海拔导航方法成本高昂，精度有限，而科学和载人飞行任务对导航和定时的要求越来越严格。NGI和其他机构的初步研究表明，全球导航卫星系统具有在月球高度使用的潜力，在许多情况下表现优于陆基跟踪技术。在月球轨道上增加导航源，在导航性能方面显示出巨大的改进，使许多新颖的科学任务和自主交会着陆成为可能。NGI开发了一个模拟软件，用于分析使用全球导航卫星系统和其他系统的航天器导航性能。这项研究将建立在NGI进行的初步研究的基础上，以确定不同的增强系统，以及增加传感器以提高性能和实现月球轨道自主导航的可能性。

With more than 40 funded Lunar missions due to launch in the next 10 years and the number of earth orbiting satellite increasing rapidly, the need for precise and reliable autonomous navigation has never been greater. Current methods of navigation at high altitudes are costly and have limited accuracy, while scientific and crewed missions have increasing more stringent navigation and timing requirements. Initial studies by NGI and others are showing the potential for GNSS to be used at Lunar altitudes, in many cases outperforming ground based tracking techniques. The addition of navigation sources in Lunar orbit are showing vast improvements in navigation performance enabling many novel scientific missions and autonomous rendezvous and landing. NGI have developed a simulation software for the analysis of spacecraft navigation performance with GNSS and other systems. This research will build on the initial studies performed at NGI to define different augmentation systems and the potential for additional sensors to improve performance and enable autonomous navigation for Lunar orbits.