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https://ir.lib.ncu.edu.tw/handle/987654321/101389
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| 題名: | New versions of the BDS/GNSS zenith tropospheric delay model IGGtrop |
| 作者: | 劉說安;Li, Wei;Yuan, Yunbin;Ou, Jikun;Chai, Yanju;Li, Zishen;Liou, Yuei-An;Wang, Ningbo |
| 貢獻者: | 太空及遙測研究中心 |
| 關鍵詞: | Earth and Environmental Science;Earth Sciences;Geodetics;Geophysics/Geodesy;Navigation systems;Original Article;Satellites;Seasonal variations;Troposphere |
| 日期: | 2015-01-01 |
| 上傳時間: | 2026-04-21 14:32:22 (UTC+8) |
| 出版者: | Springer Verlag;Berlin/Heidelberg: Springer Berlin Heidelberg |
| 摘要: | 摘要： The initial IGGtrop model proposed for Chinese BDS (BeiDou System) is not very suitable for BDS/GNSS research and application due to its large data volume while it shows a global mean accuracy of 4 cm. New versions of the global zenith tropospheric delay (ZTD) model IGGtrop are developed through further investigation on the spatial and temporal characteristics of global ZTD. From global GNSS ZTD observations and weather reanalysis data, new ZTD characteristics are found and discussed in this study including: small and inconsistent seasonal variation in ZTD between 10 ∘ S and 10 ∘ N and stable seasonal variation outside; weak zonal variation in ZTD at higher latitudes (north of 60 ∘ N and south of 40 ∘ S ) and at heights above 6 km, etc. Based on these analyses, new versions of IGGtrop, named IGGtrop _ r i ( i = 1 , 2 , 3 ) , are established through employing corresponding strategies: using a simple algorithm for equatorial ZTD; generating an adaptive spatial grid with lower resolutions in regions where ZTD varies little; and creating a method for optimized storage of model parameters. Thus, the IGGtrop _ r i ( i = 1 , 2 , 3 ) models require much less parameters than the IGGtrop model, nearly 3.1–21.2 % of that for the IGGtrop model. The three new versions are validated by five years of GNSS-derived ZTDs at 125 IGS sites, and it shows that: IGGtrop _ r 1 demonstrates the highest ZTD correction performance, similar to IGGtrop; IGGtrop _ r 3 requires the least model parameters; IGGtrop _ r 2 is moderate in both zenith delay prediction performance and number of model parameters. For the IGGtrop _ r 3 model, the biases at those IGS sites are between - 6.4 and 4.3 cm with a mean value of - 0.8 cm and RMS errors are between 2.1 and 8.5 cm with a mean value of 4.0 cm. Different BDS and other GNSS users can choose a suitable model according to their application and research requirements.
其他題名： J Geod
出版者： Berlin/Heidelberg: Springer Berlin Heidelberg
出版日期： 2015-01-01
出處： Journal of geodesy, 2015-01, Vol.89 (1), p.73-80
資源來源： Alma/SFX Local Collection
版權： Springer-Verlag Berlin Heidelberg 2014
版權： Journal of Geodesy is a copyright of Springer, 2015.
識別號： ISSN: 0949-7714
識別號： EISSN: 1432-1394
識別號： DOI: 10.1007/s00190-014-0761-5 |
| 顯示於類別: | [太空及遙測研究中心] 期刊論文
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