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BDS-3全球短报文2种低轨卫星几何法定轨

Kinematic orbit determination for LEO satellite based on BDS-3 global short message communication

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针对低轨卫星实时在线精密定轨难以获取实时改正数问题,提出基于北斗三号全球卫星导航系统(BDS-3)全球短报文播发距离改正数和状态空间表达(SSR)改正数的低轨卫星精密定轨方法.基于提出的距离改正数和SSR改正数编码播发方案,利用Swarm A卫星7 d星载全球卫星导航系统(GNSS)数据进行验证,从定轨精度以及处理效率2方面进行分析,结果表明:基于BDS-3全球短报文播发的改正数可以实现低轨卫星几何法定轨精度约为0.1 m,且基于SSR改正数的低轨卫星定轨精度优于距离改正数.非差非组合模型的定轨精度略优于无电离层(IF)组合定轨精度;当BDS-3全球短报文通信成功率为90％时,定轨精度下降约15％.在处理效率上,IF组合较非差非组合提升明显,2种方法在主频为1.6 GHz的个人笔记本上单历元处理时间均小于0.003 s.
Aiming at the problem about obtaining real-time corrections for real time online precise orbit determination for low Earth orbit satellites,a precise orbit determination method for low Earth orbit (LEO) satellites based on the distance correction and state space representation (SSR) correction broadcast by BeiDou-3 global navigation satellite system (BDS-3) global short message communication (GSMC) was proposed. The GNSS observation data (7 days) from Swarm A satellite was used for validation based on the distance correction and SSR correction encoding broadcast schemes proposed. The orbit determination accuracy and processing efficiency were analyzed. The results show that the accuracy of orbit determination is about 0.1m based on the correction broadcast by BDS-3 GSMC,and the orbit determination accuracy of LEO satellites based on the SSR correction is slightly better than that of the distance correction. The orbit determination accuracy of undifferenced and uncombined model is better than that of ionospheric-free (IF) combination model,and when the success rate of BDS-3 GSMC is 90％,the accuracy of orbit determination decreases by about 15％. In terms of processing efficiency,the IF combination has significantly improved compared to the undifferenced and uncombined model,and both methods take less than 0.003 s to process a single epoch on a personal computer with a main frequency of 1.6 GHz.

BeiDou-3 navigation satellite system (BDS-3)global short message communication (GSMC)low Earth orbit (LEO) satellitekinematic orbit determination

郭荣欣、辜声峰、龚晓鹏

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武汉大学 卫星导航定位技术研究中心,武汉 430079

北斗三号全球卫星导航系统(BDS-3) 全球短报文(GSMC) 低轨卫星 几何法精密定轨

国家自然科学基金中央高校基本科研业务费专项武汉市曙光计划

421740292042023kf01232023010201020275

2024

10.16547/j.cnki.10-1096.20240401

导航定位学报

导航定位学报

CSTPCD北大核心
影响因子：0.72
ISSN：
年,卷(期)：2024.12(4)