| 一种新的北斗Klobuchar模型及其精度分析 |
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| 引用本文： | 徐李冰,蔡成林,陈光喜,李春华.一种新的北斗Klobuchar模型及其精度分析[J].大地测量与地球动力学,2015,35(5):788-792. |
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| 作者姓名： | 徐李冰 蔡成林 陈光喜 李春华 |
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| 摘 要： | 针对传统Klobuchar模型电离层延迟修正精度不高的问题,提出一种新的Klobuchar模型,以提高北斗导航系统的精度。利用欧洲定轨中心CODE的全球格网数据作为参考,使用松弛搜索法分别对覆盖中国区域的格网点和9个测站的观测数据进行算例分析。比较两种方法得出,新模型的修正精度相对于广播模型有大幅提高;新模型预报7d内的电离层时延值修正效果也比广播模型有明显改善;格网点上的平均修正精度从67.89%提高到78.44%,观测数据的平均修正精度从69.81%提升至82.34%。
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| 关 键 词： | 电离层延迟模型 新的Klobuchar模型 松弛搜索 北斗导航系统 |
A New Klobuchar Model and Its Precision Analysis for Beidou Navigation Satellite System |
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| XU Libing,CAI Chenglin,CHEN Guangxi,LI Chunhua.A New Klobuchar Model and Its Precision Analysis for Beidou Navigation Satellite System[J].Journal of Geodesy and Geodynamics,2015,35(5):788-792. |
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| Authors: | XU Libing CAI Chenglin CHEN Guangxi LI Chunhua |
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| Abstract: | 〗Ionospheric delay is the main error of satellite measurement. As the precision of the traditional Klobuchar model is not high, this paper presents a new Klobuchar model that is designed to improve the precision of Beidou satellite navigation systems. We use a GIM model for CODE as a reference and a relax iterative search method to 〖JP2〗conduct case analysis, including the China region’s grid pointsand the observed data from nine stations. By comparing the two models, we find that the new model has a higher correction rate with respect to the broadcast model. Moreover, using the new model to forecast ionospheric delay within one week also has a better correction effect than the broadcast model. Statistical data further shows that the average correction precision improvement on grid points is from 67.89% to 78.44%, and the observed data of different stations from 69.81% to 82.34%. |
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| Keywords: | ionosphere delay model new Klobuchar model relax iterative search Beidou satellite navigation system |
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