| Monitoring Seasonal Variations of Ionospheric TEC Using GPS Measurements |
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| 作者姓名： | CAI Changsheng |
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| 作者单位： | CAI ChangshengCAI Changsheng，School of Environment and Spatial Informatics，China University of Mining and Technology，Zhaishan，Quanshan District，Xuzhou 221008，China. |
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| 基金项目： | Supported by the 0pen Research Fund Program of the Geomatics and Applications Laboratory, Liaoning Technical University （No.2005010）, and the Science and Technology Fund of China University of Mining and Technology（No.2005B020）. |
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| 摘 要： | The regional ionospheric model is adopted to determine satellite-plus-receiver differential delay. The satellite-plus-receiver differential delay is estimated as constant values for each day. Dual-frequency GPS pseudo-ranges observables are used to compute vertical TEC (VTEC). All the monthly mean VTEC profiles are represented by graphs using GPS data of the Beijing IGS site between 2000 and 2004. The monthly averaged values and amplitudes of VTEC are also represented by graphs. The results indicate that the VTEC has seasonal dependency. The monthly averaged values and amplitudes of VTEC in 2000 are about 2 times larger than that in 2004. The maximum VTEC values are observed in March and April, while the minimum VTEC values are observed in December. The seasonal variations trend is found to be similar after polynomial fitting between 2000 and 2004.
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| 关 键 词： | 电离层 TEC 季节性变异 监测 GPS测量 |
| 文章编号： | 1009-5020（2007）02-096-04 |
| 收稿时间： | 15 March 2007 |
| 修稿时间： | 2007-03-15 |
Monitoring seasonal variations of ionospheric TEC using GPS measurements |
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| CAI Changsheng.Monitoring Seasonal Variations of Ionospheric TEC Using GPS Measurements[J].Geo-Spatial Information Science,2007,10(2):96-99. |
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| Authors: | Cai Changsheng |
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| Institution: | (1) School of Environment and Spatial Informatics, China University of Mining and Technology, Zhaishan, Quanshan District, Xuzhou, 221008, China |
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| Abstract: | The regional ionospheric model is adopted to determine satellite-plus-receiver differential delay. The satellite-plus-receiver differential delay is estimated as constant values for each day. Dual-frequency GPS pseudo-ranges observables are used to compute vertical TEC (VTEC). All the monthly mean VTEC profiles are represented by graphs using GPS data of the Beijing IGS site between 2000 and 2004. The monthly averaged values and amplitudes of VTEC are also represented by graphs. The results indicate that the VTEC has seasonal dependency. The monthly averaged values and amplitudes of VTEC in 2000 are about 2 times larger than that in 2004. The maximum VTEC values are observed in March and April, while the minimum VTEC values are observed in December. The seasonal variations trend is found to be similar after polynomial fitting between 2000 and 2004. |
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| Keywords: | GPS differential delay ionosphere TEC |
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