蔡洪亮, 孟轶男, 耿涛, 谢新. 北斗三号卫星星地星间联合精密定轨初步结果[J]. 武汉大学学报 ( 信息科学版), 2020, 45(10): 1493-1500. DOI: 10.13203/j.whugis20180499
引用本文: 蔡洪亮, 孟轶男, 耿涛, 谢新. 北斗三号卫星星地星间联合精密定轨初步结果[J]. 武汉大学学报 ( 信息科学版), 2020, 45(10): 1493-1500. DOI: 10.13203/j.whugis20180499
CAI Hongliang, MENG Yinan, GENG Tao, XIE Xin. Initial Results of Precise Orbit Determination Using Satellite-Ground and Inter-Satellite Link Observations for BDS-3 Satellites[J]. Geomatics and Information Science of Wuhan University, 2020, 45(10): 1493-1500. DOI: 10.13203/j.whugis20180499
Citation: CAI Hongliang, MENG Yinan, GENG Tao, XIE Xin. Initial Results of Precise Orbit Determination Using Satellite-Ground and Inter-Satellite Link Observations for BDS-3 Satellites[J]. Geomatics and Information Science of Wuhan University, 2020, 45(10): 1493-1500. DOI: 10.13203/j.whugis20180499

北斗三号卫星星地星间联合精密定轨初步结果

Initial Results of Precise Orbit Determination Using Satellite-Ground and Inter-Satellite Link Observations for BDS-3 Satellites

  • 摘要: 截至2018年底中国已有19颗北斗三号卫星成功发射入轨,北斗三号卫星上都搭载了高精度星间链路载荷并成功实现了星间双向测距。介绍了北斗三号卫星星间链路观测模型,并利用L波段星地和Ka波段星间链路观测数据对8颗北斗三号卫星进行了星地星间联合精密定轨实验,L波段数据来自全球连续监测评估系统分布于中国境内的6个跟踪站。实验结果表明:星间链路观测值定轨残差RMS值优于6 cm,设备时延在±0.15 ns以内变化。在地面跟踪站限制在境内的情况下,增加星间链路能显著提高定轨精度。通过重叠弧段比较,联合定轨得到的卫星轨道在三维位置上的误差约为12 cm,径向误差约为3 cm,与仅国内6个站星地定轨相比提高85%。

     

    Abstract: By the end of 2018, China has successfully launched 19 BDS-3 satellites into orbit. These BDS-3 satellites are equipped with high-precision inter-satellite link (ISL) payloads and have successfully realized inter-satellite two-way pseudorange measurements. We introduce the ISL observation model and carry out precise orbit determination (POD) for eight BDS-3 satellites using L-band satellite-ground and Ka-band ISL observations. The L-band satellite-ground data is collected from six international GNSS monitoring and assessment system (iGMAS) stations located in China's territory. The results show that the root mean square (RMS) value of POD residual for the ISL observations is better than 6 cm, and the estimations of ISL equipment time delays vary within ±0.15 ns for these BDS-3 satellites. When the ground L-band tracking station is confined to the territory, the addition of ISL observations can significantly improve the orbit determination accuracy. By the orbit overlap comparison, the errors of satellite orbits obtained by combined POD are about 13 cm in 3D and about 3 cm in radial direction, yielding an improvement of 85% compared to ground-only POD using 6 stations in China.

     

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