An analysis of the accuracy of zenith tropospheric delay calculated from ECMWF/NCEP data over Asian area
文献类型：期刊论文
| 作者 | Chen Qin-Ming1,2,3; Song Shu-Li1; Zhu Wen-Yao1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2012-05-01 |
| 卷号 | 55期号:5页码:1541-1548 |
| 关键词 | GPS ZTD ECMWF NCEP |
| 英文摘要 | The tropospheric delay is an important error source for the satellite navigation and positioning, and the numerical forecast data derived from meteorological instruments can be used to calculate the tropospheric delay. In this study, the zenith tropospheric delay (ZTD) observed from 49 Global Positioning System (GPS) sites distributed in Asian area is used to assess the effectiveness and accuracy of ZTD calculated with the data from the European Center for Medium-Range Weather Forecasts (ECMWF) and the United States National Centers for Environmental Prediction (NCEP). The practicability of ECMWF/NCEP data in Asian area and the relation between the resolution and the accuracy for the ECMWF data are also studied. The results are: (1) relative to GPS observed ZTD (GPS ZTD), the bias and rms for the ECMWF data are -1.0 cm and 2.7 cm respectively, which are better than that for the NCEP data and can be used for ZTD study and application with high accuracy; the bias and rms for the NCEP forecast data are 2.4 cm and 6.8 cm, which are sufficient for the tropospheric delay correction in the real-time GNSS navigation and positioning. (2) The bias and rms show a seasonal variation, which generally show larger values in summer months and smaller values in winter months; however, the relation between the bias and rms and the latitude is not obvious, but the rms decreases with increasing altitude. In addition, the daily bias and rms at eastern Asian area in summer and at southern in winter have a relatively larger variation. (3) The resolutions of 2.5 degree and 0.5 degree ECMWF data are compared; the rms for the latter is decreased by 1 similar to 5 mm than the former. These results provide a reference for the effectiveness and accuracy of the ECMWF/NCEP data used for calculating the tropospheric delay in the space geodesy, navigation and positioning, and INSAR, etc. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geochemistry & Geophysics |
| 研究领域[WOS] | Geochemistry & Geophysics |
| 关键词[WOS] | WATER-VAPOR ; GPS ; NETWORK ; MODEL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000304734300011 |
| 源URL | [http://119.78.226.72/handle/331011/18132]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.SW Univ Sci & Technol, Sichuan Mianyang 621010, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen Qin-Ming,Song Shu-Li,Zhu Wen-Yao. An analysis of the accuracy of zenith tropospheric delay calculated from ECMWF/NCEP data over Asian area[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2012,55(5):1541-1548. |
| APA | Chen Qin-Ming,Song Shu-Li,&Zhu Wen-Yao.(2012).An analysis of the accuracy of zenith tropospheric delay calculated from ECMWF/NCEP data over Asian area.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,55(5),1541-1548. |
| MLA | Chen Qin-Ming,et al."An analysis of the accuracy of zenith tropospheric delay calculated from ECMWF/NCEP data over Asian area".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 55.5(2012):1541-1548. |
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来源：上海天文台
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