| 我国西部罗兰台站定位性能分析 |
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| 引用本文： | 燕保荣,李云,郭伟,华宇.我国西部罗兰台站定位性能分析[J].天文学报,2021,62(3):26. |
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| 作者姓名： | 燕保荣 李云 郭伟 华宇 |
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| 作者单位： | 中国科学院国家授时中心 西安 710600;中国科学院精密导航定位与定时技术重点实验室 西安 710600 |
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| 基金项目： | 国家自然科学基金项目(11803040), 中国科学院前沿科学重点研究项目(QYZDJ-SSW-JSC034)\lk 资助 |
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| 摘 要： | 罗兰导航系统(Long range navigation)是全球卫星导航系统的有效备份和补充.罗兰信号以地波形式沿地球表面传播,随着传播距离的增加,地波信号受到地面电参数的影响会出现一定程度的传播延时,信号的场强也会逐渐减弱.为分析我国西部罗兰台站的定位性能,从理论角度分析了不同介质类型中二次时延随距离的变化关系,并结合电磁波传播规律计算了场强随距离的变化.根据罗兰接收机最低性能标准,分析了西部台站的覆盖区域以及定位范围,计算了定位区域内的几何精度因子,结果显示定位范围内大部分区域的几何精度因子小于6.在计算区域内仿真西部台站定位误差,分析结果表明:就定位而言,西部台站几何布局较为合理,但是由于二次时延的影响,纬度和经度方向定位误差较大,必须采用差分等抑制观测误差的方法提高定位精度.为扩大西部罗兰台站的定位覆盖区域,接收机的接收能力有待提升.
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| 关 键 词： | 罗兰系统 二次时延 几何精度因子 定位误差 |
| 收稿时间： | 2020/8/24 0:00:00 |
Positioning Performance Analysis of Loran Stations in Western China |
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| YAN Bao-rong,LI Yun,GUO Wei,HUA Yu.Positioning Performance Analysis of Loran Stations in Western China[J].Acta Astronomica Sinica,2021,62(3):26. |
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| Authors: | YAN Bao-rong LI Yun GUO Wei HUA Yu |
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| Affiliation: | National Time Service Center, Chinese Academy of Sciences, Xián 710600;Key Laboratory of Precise Positioning and Timing Technology, Chinese Academy of Sciences, Xián 710600 |
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| Abstract: | Long range navigation (Loran) system is an effective backup and supplement of the Global Navigation Satellite System (GNSS). Loran signal propagates along the earth surface in the form of ground wave. With the increase of propagation distance, the ground wave signal will be affected by the ground electrical parameters, causing a certain additional propagation delay. The signal field strength will gradually weaken via distance. In order to analyze the positioning performance of Loran stations in western China, the relationship between secondary factor and distance in different media types is analyzed theoretically, and the variation of field strength with distance is calculated based on the propagation law of electromagnetic wave. According to the minimum performance standard of Loran receiver, the coverage area and positioning range of the western station are analyzed, and the Geometric Dilution of Precision (GDOP) in the positioning area are calculated. The results show that GDOP of most areas in the positioning range are less than 6. In the calculation area, the positioning error of western stations is simulated. The analysis results show that the geometric layout of western stations is reasonable. However, due to the influence of secondary factor, the positioning errors in latitude and longitude directions are relatively large. Therefore, it is necessary to adopt differential methods to suppress the observation errors to improve the positioning accuracy. In order to expand the positioning area of Loran station, the receiving ability of the receiver needs to be improved. |
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| Keywords: | Loran system secondary factor Geometric Dilution of Precision (GDOP) position bias |
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