天象一号低轨导航增强系统研究与在轨试验验证

如何实现GNSS全球瞬时高精度服务一直是GNSS领域的迫切需求和研究热点。采用低轨导航增强技术体制,利用低轨卫星运动几何变化快的特点,解决GNSS精密单点定位快速收敛问题和性能提升问题,是GNSS高精度定位服务未来发展的重要方向。从全球瞬时高精度服务内涵出发,阐述了天象一号低轨导航增强试验系统的技术体制,包括系统工作模式、兼容互操作与通导一体化信号体制,以及实时自主定轨、快速高精度定位、完好性监测服务等。仿真试验和在轨试验表明基于低轨增强可在1min左右实现厘米级的高精度定位性能。

Research and In-orbit Experimental Validation of LEO-based Navigation Augmentation System of Tianxiang-1 Mission

To realize GNSS global instantaneous high-precision service has always been an urgent demand and research hotspot in the GNSS field. The LEO navigation augmentation technology is adopted to solve the problem of rapid convergence and performance improvement of GNSS precise point positioning by taking advantage of the characteristics of fast geometric changes of LEO satellites. This will be an important direction for the future development of GNSS high-precision positioning service. Based on the concept of global instantaneous high-precision service, this paper introduces the technical system, system working modes, compatible interoperation and communication & navigation integrated signal design, real-time autonomous orbit determination, fast and high-precision positioning, and integrity monitoring service of the Tianxiang-1 LEO navigation augmentation experimental system. Simulation test and in-orbit experimental validation results show that centimeter level precision positioning performance can be achieved within 1 minute based on the LEO navigation augmentation system.