Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay
Abstract Tropospheric delay is an important factor affecting high precision Global Navigation Satellite System (GNSS) positioning and also the basic data for GNSS atmospheric research. However, the existing tropospheric delay models have some problems, such as only a single function used for the ent...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-11-01
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| Series: | Satellite Navigation |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s43020-022-00088-w |
| _version_ | 1828174506175234048 |
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| author | Ge Zhu Liangke Huang Yunzhen Yang Junyu Li Lv Zhou Lilong Liu |
| author_facet | Ge Zhu Liangke Huang Yunzhen Yang Junyu Li Lv Zhou Lilong Liu |
| author_sort | Ge Zhu |
| collection | DOAJ |
| description | Abstract Tropospheric delay is an important factor affecting high precision Global Navigation Satellite System (GNSS) positioning and also the basic data for GNSS atmospheric research. However, the existing tropospheric delay models have some problems, such as only a single function used for the entire atmosphere. In this paper, an ERA5-based (the fifth generation of European Centre for Medium-Range Weather Forecasts Reanalysis) global model for vertical adjustment of Zenith Tropospheric Delay (ZTD) using a piecewise function is developed. The ZTD data at 611 radiosonde stations and the MERRA-2 (second Modern-Era Retrospective analysis for Research and Applications) atmospheric reanalysis data were used to validate the model reliability. The Global Zenith Tropospheric Delay Piecewise (GZTD-P) model has excellent performance compared with the Global Pressure and Temperature (GPT3) model. Validated at radiosonde stations, the performance of the GZTD-P model was improved by 0.96 cm (23%) relative to the GPT3 model. Validated with MERRA-2 data, the quality of the GZTD-P model is improved by 1.8 cm (50%) compared to the GPT3 model, showing better accuracy and stability. The ZTD vertical adjustment model with different resolutions was established to enrich the model's applicability and speed up the process of tropospheric delay calculation. By providing model parameters with different resolutions, users can choose the appropriate model according to their applications. |
| first_indexed | 2024-04-12T04:14:08Z |
| format | Article |
| id | doaj.art-1a6b5377028542489e7ced1930716f4d |
| institution | Directory Open Access Journal |
| issn | 2662-1363 |
| language | English |
| last_indexed | 2024-04-12T04:14:08Z |
| publishDate | 2022-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Satellite Navigation |
| spelling | doaj.art-1a6b5377028542489e7ced1930716f4d2022-12-22T03:48:27ZengSpringerOpenSatellite Navigation2662-13632022-11-013111010.1186/s43020-022-00088-wRefining the ERA5-based global model for vertical adjustment of zenith tropospheric delayGe Zhu0Liangke Huang1Yunzhen Yang2Junyu Li3Lv Zhou4Lilong Liu5College of Geomatics and Geoinformation, Guilin University of TechnologyCollege of Geomatics and Geoinformation, Guilin University of TechnologyCollege of Resources and Environment, Beibu Gulf UniversityCollege of Geomatics and Geoinformation, Guilin University of TechnologyCollege of Geomatics and Geoinformation, Guilin University of TechnologyCollege of Geomatics and Geoinformation, Guilin University of TechnologyAbstract Tropospheric delay is an important factor affecting high precision Global Navigation Satellite System (GNSS) positioning and also the basic data for GNSS atmospheric research. However, the existing tropospheric delay models have some problems, such as only a single function used for the entire atmosphere. In this paper, an ERA5-based (the fifth generation of European Centre for Medium-Range Weather Forecasts Reanalysis) global model for vertical adjustment of Zenith Tropospheric Delay (ZTD) using a piecewise function is developed. The ZTD data at 611 radiosonde stations and the MERRA-2 (second Modern-Era Retrospective analysis for Research and Applications) atmospheric reanalysis data were used to validate the model reliability. The Global Zenith Tropospheric Delay Piecewise (GZTD-P) model has excellent performance compared with the Global Pressure and Temperature (GPT3) model. Validated at radiosonde stations, the performance of the GZTD-P model was improved by 0.96 cm (23%) relative to the GPT3 model. Validated with MERRA-2 data, the quality of the GZTD-P model is improved by 1.8 cm (50%) compared to the GPT3 model, showing better accuracy and stability. The ZTD vertical adjustment model with different resolutions was established to enrich the model's applicability and speed up the process of tropospheric delay calculation. By providing model parameters with different resolutions, users can choose the appropriate model according to their applications.https://doi.org/10.1186/s43020-022-00088-wPiecewise functionVertical adjustmentZTDGNSSTropospheric delay |
| spellingShingle | Ge Zhu Liangke Huang Yunzhen Yang Junyu Li Lv Zhou Lilong Liu Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay Satellite Navigation Piecewise function Vertical adjustment ZTD GNSS Tropospheric delay |
| title | Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay |
| title_full | Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay |
| title_fullStr | Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay |
| title_full_unstemmed | Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay |
| title_short | Refining the ERA5-based global model for vertical adjustment of zenith tropospheric delay |
| title_sort | refining the era5 based global model for vertical adjustment of zenith tropospheric delay |
| topic | Piecewise function Vertical adjustment ZTD GNSS Tropospheric delay |
| url | https://doi.org/10.1186/s43020-022-00088-w |
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