| Klobuchar模型的实用分析与改进 |
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| 引用本文： | 赵威,张成义.Klobuchar模型的实用分析与改进[J].空间科学学报,2013,33(6):624-628. |
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| 作者姓名： | 赵威 张成义 |
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| 作者单位： | 南京信息工程大学数理学院 南京 210044 |
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| 基金项目： | 南京信息工程大学基金课题项目资助(10jy004) |
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| 摘 要： | 电离层延迟误差是无线电信号传播中不可忽视的误差源.GPS特许用户利用双频接收机的双频观测值直接对电离层延迟进行实时测定,其所得结果精度很高.多数普通用户所使用的单频接收机依靠电离层模型对其进行误差修正,效果不很理想.本文通过WUHN观测站双频接收机10天的实测数据对GPS广播星历采用的Klobuchar模型进行了验证,其结果与前人论述相一致.此外,经由反映太阳活动强度的太阳相对黑子数对Klobuchar模型提出了新的改进方法.实验数据结果表明,该方法对此模型修正效果有大幅提升,对原模型修正效果>50%的修正率由60%左右提升至85%以上,>80%的修正率由10%左右提升至40%以上.在实际应用中单频接收机用户可以参考本文改进方法对Klobuchar模型进行修正.
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| 关 键 词： | Klobuchar VTEC 电离层延迟 相对太阳黑子数 |
| 收稿时间： | 2012-09-13 |
Practical Analysis and Improvement of Klobuchar Model |
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| Affiliation: | College of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing 210044 |
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| Abstract: | Ionosphere delay error is an unneglectable error source in the propagation of radio signal. The GPS authorized users utilize dual-frequency observations of dual-frequency receivers to determine the ionosphere delay in real time, so the measured results have a high precision. Compared to authorized users, most general users use the ionosphere model to correct the delay error when they utilize single-frequency receivers. Relative to dual-frequency observations, the correction effect by ionosphere model is not ideal. In this paper, dual-frequency observations are used to verify the Klobuchar model which chosen by GPS broadcast ephemeris has a widespread application in single-frequency receivers. Ten days' data of WUHN Observation Station has been picked up to analyze Klobuchar model, and the obtained results were consistent with previous researching results. Also, a new improvement method is proposed based on previous analysis. Since the variability of ionosphere has a close relationship with the Sun's activity intensity, and the sunspot relative number is a symbol reflecting the Sun's activity intensity, the new improvement method is realized by means of sunspot relative number to modify Klobuchar model. This improved method has been proved with a large scale promotion in the correction effect through experimental data. Relative to original model, the correction rate greater than 50% has upgraded from about 60% to 85% above, and that greater than 80% upgraded from 10% to 40% above. In practical application, users of single-frequency receivers can refer to this improvement method to correct Klobuchar model. |
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