| 锚固站对BDS自主导航精度的影响分析 |
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| 引用本文： | 龚晓颖,蔡诗响.锚固站对BDS自主导航精度的影响分析[J].测绘通报,2020,0(4):68-75. |
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| 作者姓名： | 龚晓颖 蔡诗响 |
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| 作者单位： | 1. 西南交通大学, 四川 成都 611756;2. 中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室, 湖北 武汉 430077;3. 四川大学, 四川 成都 610065 |
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| 基金项目： | 国家重点研发计划（2016YFB0501900）；国家自然科学基金（41504021；41374032）；大地测量与地球动力学国家重点实验室开放基金（SKLGED2018-3-4-E） |
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| 摘 要： | 介绍了自主导航的轨道确定及时间同步观测方程。以北斗仿真全星座为对象，通过采用仿真星间及卫星与地面锚固站间观测值，进行了60 d自主导航解算，分别探讨了锚固站数量及锚固站观测连续性对北斗卫星导航系统（BDS）3类卫星自主导航精度的影响。结果表明：锚固站数量及观测连续性对RERR及CERR无影响；加入1个锚固站即可显著改进URE结果精度，继续增加锚固站数量虽然可进一步提高URE精度但其改进效果有限；锚固站观测中断时间越长，其对应自主导航精度越低。因此，在BDS自主导航运行模式下应保持较高的锚固站观测频次以保证自主导航精度；另外，锚固站数量及观测连续性对北斗系统3类卫星自主导航精度的影响无显著差异。
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| 关 键 词： | 北斗卫星导航系统 自主导航 锚固站 星间链路 参数分解滤波模型 |
| 收稿时间： | 2019-06-20 |
Influence of anchors on the precision of autonomous navigation for BDS |
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| GONG Xiaoying,CAI Shixiang.Influence of anchors on the precision of autonomous navigation for BDS[J].Bulletin of Surveying and Mapping,2020,0(4):68-75. |
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| Authors: | GONG Xiaoying CAI Shixiang |
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| Institution: | 1. Southwest Jiaotong University, Chengdu 611756, China;2. State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;3. Sichuan Univerisity, Chengdu 610065, China |
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| Abstract: | This paper has introduced the orbit determination and time synchronization observation equations. Aiming at the simulated constellation of BDS, AutoNav for 60 days has been implemented adopting the simulated inter-satellite and satellite-anchor observations. The influence of the number of anchors and the continuity of anchor observations on the precision of AutoNav has been discussed, considering the three different types of satellites for BDS. Results indicate that the number of anchors and the continuity of anchor observations have no affect on the result of RERR and CERR, but the precision of URE can be improved distinctly by adding one anchor into the constellation, and which can be further improved when increasing the number of anchors with a limited effect. On the other hand, for the continuity of anchor observations, the longer the interruption time of anchor observations, the lower the precision of AutoNav. Therefore, the high observation frequency to satellites from anchors should be ensured to keep the high precision of AutoNav. Besides, the influences of the number of anchors and the continuity of anchor observations on the three types of satellites have no difference. |
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| Keywords: | BDS AutoNav anchor inter-satellite cross-link parameter decomposition filter model |
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