| 2013-2015年北斗空间信号测距误差的精度评估 |
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| 引用本文： | 刘万科.2013-2015年北斗空间信号测距误差的精度评估[J].国防科技大学学报,2016,38(3). |
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| 作者姓名： | 刘万科 |
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| 作者单位： | 武汉大学测绘学院 |
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| 基金项目： | 国家自然科学基金项目（41304005,41374034）；湖北省自然科学杰出青年基金（2015CFA039） |
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| 摘 要： | 基于武汉大学发布的精密星历，计算了2013年1月至2015年9月北斗广播星历的轨道、钟差和空间信号测距误差并对其进行了统计分析评估。结果表明：北斗卫星的径向精度总体上优于0.7m、法向优于1.4m，且无明显的长期变化趋势；在切向精度上，IGSO和MEO优于2.1m，GEO的切向精度已从14m左右提升至8m左右；北斗GEO、IGSO、MEO的钟差精度分别为6.3ns、4.7ns、4.3ns，所有卫星的钟差精度总体上优于6ns；所有卫星的空间信号误差SISRE精度总体上优于2m，从长期来看，MEO卫星的SISRE精度较为稳定；IGSO和GEO卫星的SISRE精度存在一定的波动。
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| 关 键 词： | 北斗 广播星历 空间信号测距误差 精度评估 |
Accuracy Assessment of BDS Signal-in-Space Range Errors for 2013-2015 |
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| Abstract: | Based on precise ephemeris provided by Wuhan University, BDS broadcast ephemeris errors are computed over the past three years from 2013 to 2015. The orbit errors, clock errors, and Signal-in-Space User Range Errors(SISREs) are presented and analyzed in different time periods for assessment. The results show that the radial accuracy of overall BDS satellites is less than 0.7m and normal accuracy of that is less than 1.4m. Additionally, no obviously long term trends are found in both radial and normal errors. In term of along-track errors, the accuracies of IGSO and MEO satellites are all less than 2.1m and the along-track accuracy of GEO is improved from 14m to 8m. The clock accuracies of GEO, IGSO and MEO are 6.3ns,4.7ns and 4.3ns,respectively,and the clock accuracies of all satellites are not more than 6ns. The SISREs of all satellites are generally less than 2m, and the SISREs of MEO satellites are relatively stable over the past 3 years. However, IGSO SISRES and GEO SISRES have some fluctuation in certain level. |
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