| LEO星载GPS PPP定位周期误差分析及处理策略 |
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| 引用本文： | 侯福荣,涂锐,冯祎,张睿,韩军强,洪菊.LEO星载GPS PPP定位周期误差分析及处理策略[J].全球定位系统,2020,45(5):6-13. |
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| 作者姓名： | 侯福荣 涂锐 冯祎 张睿 韩军强 洪菊 |
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| 作者单位： | 中国科学院国家授时中心 ,陕西西安 710600;中国科学院大学 ,北京 100049;中国科学院国家授时中心 ,陕西西安 710600;中国科学院大学 ,北京 100049;中国科学院精密导航定位与定时技术重点实验室 ,陕西西安710600;中国科学院国家授时中心 ,陕西西安 710600;中国科学院精密导航定位与定时技术重点实验室 ,陕西西安710600 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;青年人才项目 |
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| 摘 要： | 采用GRACE卫星的星载GPS观测数据进行动态精密单点定位解算,发现定位误差存在明显的周期特性,第一个特性为每间隔四天的定位误差序列的波形基本重合,第二个特性为相邻两天定位误差序列有横坐标平移的趋势.基于此,提出了两种消除周期性误差的方法,分别为基于中位数建模的周期项误差剔除方法和基于平移预报的周期项误差剔除方法.前者对一组数据序列中的中间序列的精度提升较为明显,后者对精度的提升在整体上较为稳定,对两种方法的改善效果进行综合分析,最终可以将定位精度从5 dm提高到2 dm,三个方向的均方根（RMS）值得到显著降低.
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| 关 键 词： | 低轨卫星 星载接收机定位 周期性误差 误差剔除 定位精度 |
Analysis of PPP period error of LEO satellite spaceborne GPS |
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| Affiliation: | 1.1. Nation Time Service Center, Chinese Academy of Sciences, Xi′an 710600,China2.University of Chinese Academy of Sciences, Beijing 100049,China3.Key laboratory of precision navigation and timing technology, Chinese Academy of Sciences, Xi′an 710600,China |
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| Abstract: | Using space-borne GPS observation data of GRACE for kinematic precise point positioning, it is found that the positioning error has obvious periodic characteristics. The first characteristic is that the waveforms of the positioning error sequences at intervals of four days basically coincide, and the second characteristic is that the positioning error sequences of two adjacent days have a tendency to shift along the abscissa. Based on the above two characteristics, two methods for eliminating periodic errors are proposed, which are the periodic item error elimination method based on median modeling and the periodic error elimination method based on translation prediction. The former improves the accuracy of the intermediate sequence in a group of data series obviously, while the latter is more stable on the whole. A comprehensive analysis of the improvement effect of the two methods is carried out. Finally, the positioning accuracy is improved from 5 dm to 2 dm. The RMS values in the three directions are obtained significantly reduced. |
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