| 四大GNSS广播星历精度评估与对比分析 |
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| 引用本文： | 张熙,刘长建,章繁,吴庆,胡小华.四大GNSS广播星历精度评估与对比分析[J].武汉大学学报(信息科学版),2022,47(2):208-218. |
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| 作者姓名： | 张熙 刘长建 章繁 吴庆 胡小华 |
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| 作者单位： | 1.61363 部队，陕西 西安，710000 |
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| 基金项目： | 国家自然科学基金41374041 |
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| 摘 要： | 分析了 目前广播星历精度评估中存在的问题,详细论述了广播星历精度评估过程中对精密星历进行天线相位中心改正的取值方法,提出了利用单颗星单日钟差均值作二次差对广播星历钟差的系统性偏差进行改正的方法.选取2019-09-01-2019-11-01 共计62天的多模 GNSS 实验(multi-GNSS experiment,...
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| 关 键 词： | 广播星历 精密星历 星历对比 精度评估 |
| 收稿时间： | 2020-12-27 |
Accuracy Evaluation and Comparative Analysis of Four Major GNSS Broadcast Ephemeris |
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| Institution: | 1.61363 Troops, Xi'an 710000, China2.College of Geospatial Information, Information Engineering University, Zhengzhou 450000, China |
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| Abstract: | Objectives The major global navigation satellite system (GNSS) includes global positioning system (GPS), global navigation satellite system (GLONASS), Galileo navigation satellite system (Galileo), and BeiDou navigation satellite system (BDS). The accuracy of broadcast ephemeris of the four major GNSS should be evaluated, and the evaluation results do not include systematic deviations. Methods We download the mixed broadcast ephemeris and precise ephemeris of the multi-GNSS experiment (MGEX) for a total of 62 days from 1st September to 1st November in 2019, and select healthy satellite data from broadcast ephemeris every 15 minutes. After this preparation, we calculate the satellite position and clock difference of each GNSS system, then compare root mean square (RMS) of orbital position deviation, RMS of clock difference, and RMS of signal-in-space range error (SISRE) of all kinds of satellites with precise ephemeris. To correct the position of antenna phase center, the correction value should be selected corresponding to the generation of broadcast ephemeris. To eliminate the systematic deviation of clock difference, we make a quadratic difference on the average value of daily clock difference of single satellite. Results The radial, along-track, cross-track position deviation and clock difference of the four major GNSS broadcast ephemeris fluctuate around 0 scale, indicating that the calculation results do not include systematic deviation, the methods of correcting the position of antenna phase center and eliminating systematic deviation of clock difference are correct and effective. Conclusions The order of accuracies of the four major GNSS broadcast ephemeris from high to low is Galileo, GPS, BDS, GLONASS. With the development of each navigation system, the accuracy of broadcas ephemeris can be further improved. |
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