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Assessment of Empirical Troposphere Model GPT3 Based on NGL's Global Troposphere Products
Ding, Junsheng1,2; Chen, Junping1,2,3
2020-07-01
Source PublicationSENSORS
Volume20Issue:13Pages:9
AbstractTropospheric delay is one of the major error sources in GNSS (Global Navigation Satellite Systems) positioning. Over the years, many approaches have been devised which aim at accurately modeling tropospheric delays, so-called troposphere models. Using the troposphere data of over 16,000 global stations in the last 10 years, as calculated by the Nevada Geodetic Laboratory (NGL), this paper evaluates the performance of the empirical troposphere model GPT3, which is the latest version of the GPT (Global Pressure and Temperature) series model. Owing to the large station number, long time-span and diverse station distribution, the spatiotemporal properties of the empirical model were analyzed using the average deviation (BIAS) and root mean square (RMS) error as indicators. The experimental results demonstrate that: (1) the troposphere products of NGL have the same accuracy as the IGS (International GNSS Service) products and can be used as a reference for evaluating general troposphere models. (2) The global average BIAS of the ZTD (zenith total delay) estimated by GPT3 is -0.99 cm and the global average RMS is 4.41 cm. The accuracy of the model is strongly correlated with latitude and ellipsoidal height, showing obviously seasonal variations. (3) The global average RMS of the north gradient and east gradient estimated by GPT3 is 0.77 mm and 0.73 mm, respectively, which are strongly correlated with each other, with values increasing from the equator to lower latitudes and decreasing from lower to higher latitudes.
KeywordGPT3 troposphere model NGL products ZTD gradient GNSS
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province
DOI10.3390/s20133631
Language英语
Funding ProjectNational Natural Science Foundation of China[11673050] ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone[ZJ2018-ZD-009] ; National Key R&D Program of China[2018YFB0504300] ; Key R&D Program of Guangdong province[2018B030325001]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province
WOS Research AreaChemistry ; Engineering ; Instruments & Instrumentation
WOS SubjectChemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation
WOS IDWOS:000553200600001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82566
Collection中国科学院国家天文台
Corresponding AuthorChen, Junping
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Shanghai Key Lab Space Nav & Positioning Tech, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Ding, Junsheng,Chen, Junping. Assessment of Empirical Troposphere Model GPT3 Based on NGL's Global Troposphere Products[J]. SENSORS,2020,20(13):9.
APA Ding, Junsheng,&Chen, Junping.(2020).Assessment of Empirical Troposphere Model GPT3 Based on NGL's Global Troposphere Products.SENSORS,20(13),9.
MLA Ding, Junsheng,et al."Assessment of Empirical Troposphere Model GPT3 Based on NGL's Global Troposphere Products".SENSORS 20.13(2020):9.
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