中国空间科学技术

中国空间科学技术 ›› 2024, Vol. 44 ›› Issue (1): 106-113.doi: 10.16708/j.cnki.1000-758X.2024.0012

• 论文 • 上一篇    下一篇

一种适用于北斗三号星间扩展用户的定轨算法

邵瑞强，常家超，林夏，谭双杰，龚文斌，林宝军   

  1. 1.上海微小卫星工程中心 导航卫星研究所，上海201210
    2.中国科学院 微小卫星创新研究院，上海201210
    3.中国科学院 空天信息创新研究院，北京100094
    4.中国科学院大学 计算机科学与技术学院，北京100094
    5.上海科技大学 信息科学与技术学院，上海201210
  • 发布日期:2024-02-01 出版日期:2024-02-25

An autonomous orbit determination algorithm for spacecraft using extended service of BDS inter-satellite-link

SHAO Ruiqiang，CHANG Jiachao，LIN Xia，TAN Shuangjie，GONG Wenbin，LIN Baojun   

  1. 1.Navigation Satellite Research Institute，Shanghai Engineering Center for Microsatellites，Shanghai 201210，China
    2.Innovation Academy for Microsatellites of Chinese Academy of Sciences，Shanghai 201210，China
    3.Aerospace Information Research Institute，Chinese Academy of Sciences，Beijing 100094，China
    4.School of Computer Science and Technology， University of Chinese Academy of Sciences，Beijing 100094，China
    5.School of Information Science and Technology， ShanghaiTech University，Shanghai 201210，China
  • Online:2024-02-01 Published:2024-02-25

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摘要： 针对北斗卫星导航系统星间链路网络扩展服务航天器的精密轨道确定及时间同步需求，提出了基于多项式轨道拟合方法的轨道确定与时间同步算法，克服了传统算法中使用北斗星间链路双向测量数据必须具备初始轨道和钟差等先验信息的约束，可有效拓宽北斗星间链路使用场景。该算法以多项式表达航天器一段时间的轨道和钟差，并使用星间双向测量数据基于最小二乘算法迭代估计多项式系数，从而完成航天器轨道和钟差解算。利用北斗三号星间链路在轨实测数据的试验表明定轨和时间同步精度均在0.12m以内，有效验证了该算法的正确性。

关键词: 星间链路, 自主定轨, 时间同步, 最小二乘算法, 多项式拟合

Abstract:  The autonomous orbit determination and time synchronization algorithm of spacecraft that uses the extended service of BeiDou Navigation Satellite System(BDS)  inter-satellite-link（ISL） was focused on.An orbit determination and time synchronization algorithm based on polynomial fitting was put forward，aiming at avoiding the constraint in traditional algorithm that the initial orbit and clock parameters are necessary for using ISL two-way ranging measurements.The algorithm will expand the application scenarios of BDS ISL effectively.In the proposed algorithm，the spacecraft’ s orbit and clock bias were described by polynomial and its coefficients were estimated based on least squares algorithm and ISL two-way ranging measurements.Thus，the spacecraft’ s orbit and clock parameters could be calculated.The test results based on onboard ISL two-way ranging measurements show that the orbit determination and time synchronization accuracy of the proposed algorithm can achieve less than 0.12m，which proves its feasibility.

Key words:  inter-satellite-link, autonomous orbit determination, time synchronization, least squares algorithm, polynomial fitting