Curriculum Vitae

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• Research
• Education
• Work Experience
• Projects
• Selected Publications
• Academic Reports
• Invited Talks
• Honors & Awards
• Journal Reviewer

Dr. Junsheng DING [pdf]

Postdoc@LSGS PolyU
The Hong Kong Polytechnic University, Hong Kong 999077, China

Hi, I am a Postdoctoral Fellow at the Satellite Navigation Lab in Department of Land Surveying and Geospatial Science (LSGS, formerly LSGI) of The Hong Kong Polytechnic University (PolyU), working with Prof. Wu CHEN. Previously, I finished my PhD at Shanghai Astronomical Observatory (SHAO), Chinese Academy of Sciences (CAS), advised by Prof. Junping CHEN, and my undergraduate degrees at Chang’an University.

Research

I work on the atmosphere as seen through GNSS. The troposphere bends and delays every satellite signal on its way to a receiver: a nuisance for GNSS, but free information for meteorology. My work sits between the two: delay products precise enough for space geodesy, and the scientific application for weather and climate. Representative projects include TropDS, TropAI, TropVAE, rtPWV, and MFHCM.

Lately I have been focusing what AI foundation models can and cannot do here (AI4G). They forecast tropospheric delay surprisingly well, but their errors carry a spatial and seasonal structure nobody fully understands. GNSS is a good instrument for finding and reducing those errors, since it observes the atmosphere independently of the models’ training data.

The work falls into a few threads:

• trop modeling and products: downscaling, compression, vertical modelling, GNSS vs. NWM ray-tracing;
• foundation model for geodesy: delay forecasting, real-time retrieval, where weather models go wrong;
• water vapor and climate: the 1994-2020 global GNSS PWV record, trends, turbulence for rainfall;
• navigation & positioning: PPP-RTK, offshore NRTK, large-height difference trop modeling.

Education

• 2018–2023, PhD, Geodesy, University of Chinese Academy of Sciences, Beijing, China
• 2018–2023, PhD, Geodesy, Shanghai Astronomical Observatory, CAS, Shanghai, China
• 2014–2018, BSc, Geomatics Engineering, Chang’an University, Xi’an, China

Work Experience

• 2023.7–Present, Postdoctoral Fellow, The Hong Kong Polytechnic University, Hong Kong, China
• 2019.9–2021.9, Research Assistant, Shanghai Astronomical Observatory, CAS, Shanghai, China
• 2018.7–2018.8, Summer Trainee, National Institute of Metrology, China, Beijing, China
• 2017.7–2017.8, Software testing intern, Trimble R&D Center in China, Trimble Inc., Xi’an, China

Projects

• Postdoc Matching Fund Scheme, The Hong Kong Polytechnic University.
• Foundation model‑driven Beidou/GNSS Trop Reconstruction for Fast PPP‑AR Convergence (participant)
• Research Project on Enhancing High-Precision Positioning Network Capabilities (participant)
• GNSS Kinematic Reference Stations with Chip Scale Atomic ClockAiding for Offshore Real-Time Kinematic (RTK) Positioning (participant)
• PPP-RTK Regional Products Generation (participant)

Selected Publications

TropDS: Downscaling to Enhance Tropospheric Delay Grid Precision in Space Geodesy Ding J, Chen W, Chen J, Wang J, Zhang Y Journal of Geodesy, 2026, 100, 53 Paper | Code | WeChat News | Website

Impact of VBAEformer Compression Algorithm Precision Loss on the Tropospheric Delays for Microwave Remote Sensing Ding J, Xu C, Chen W, Chen J, Wang J, Zhang Y, Bai L, Han T, Xiong Y IEEE Transactions on Geoscience and Remote Sensing, 2025, 63, 4107311 Paper | WeChat News | Website

Real-Time High-Resolution Global PWV Retrieval Based on Weather Forecast Foundation Models and Cross-Validation With Radiosonde, GNSS, and ERA5 Ding J, Chen W, Chen J, Wang J, Zhang Y, Bai L IEEE JSTARS, 2025, 18, 15972–15981 Paper | WeChat News | Website

A Novel Network RTK Technique for Mobile Platforms: Extending High-Precision Positioning to Offshore Environments Chen W, Ding J, Wang Y, Mi X, Liu T TransNav Journal, 2025, 19(2), 371–380 Paper | TransNav 2025

Spatiotemporal Inhomogeneity of Accuracy Degradation in AI Weather Forecast Foundation Models: A GNSS perspective Ding J, Chen W, Chen J, Wang J, Zhang Y, Bai L, Wang Y, Mi X, Liu T, Weng D Int J Appl Earth Obs Geoinf (JAG), 2025, 139, 104473 Paper | Supplementary Data | WeChat News | Website

AI Foundation Models Facilitate Real-time Global GNSS PWV Retrieval with Sub-millimeter Accuracy Ding J, Chen W, Chen J, Wang J, Zhang Y, Weng D, Liu T, Mi X, Soja B, Bai L ESS Open Archive, July 12, 2024 Preprint | Poster | Website

Forecasting of Tropospheric Delay using AI Foundation Models Ding J, Mi X, Chen W, Chen J, Wang J, Zhang Y, Awange JL, Soja B, Bai L, Deng Y, Tang W IEEE Transactions on Geoscience and Remote Sensing, 2024, 62, 5803019 Preprint | Paper | WeChat News | Presentation | CPGNSS 2025 | Website

A Novel Method for Tropospheric Delay Mapping Function Vertical Modelling Ding J, Chen J, Wang J and Zhang Y Journal of Geodesy, 2024, 98, 37 Paper | Code | BibTeX

Characteristic Differences in Tropospheric Delay between NGL Products and NWM Ray-tracing Ding J, Chen J, Wang J and Zhang Y GPS Solutions, 2023, 27, 47 Paper | BibTeX

More

• Liu W, Zhang Y, Chen J, Yu C, Ding J, Song Z, Zhang C, Cheng Q (2026) Service area extension of PPP-B2b using clock bias prediction based on frequency stability and orbit age-extension. Meas Sci Technol 37. doi:10.1088/1361-6501/aeb564.
• Liu T, Chen W, Lu Z, Zhang W, Lu Y, Wang F, Sun M, Nie Y, Ding J, He Y, Chen B (2026) Accurate Ionospheric TEC prediction with a causal attention network at northern EIA crests. JGR: Machine Learning and Computation 3(3):e2025JH000994. doi:10.1029/2025JH000994.
• Liu T, Chen W, Mi X, Chen X, Yang Y Ding J, Liu T, Wang Y, Weng D (2026) Ionospheric nonlinear interpolation model for Mid- and Low-latitude network RTK during solar maxima. GPS Solut 30, 7. doi:10.1007/s10291-025-01976-9.
• Deng Y, Chen W, Ding J, El-Mowaf A, Weng D, Tang L, Bai L, Mi X (2025) Improving GNSS precise point positioning with tropospheric constraints from data-driven numerical weather prediction model. Geo-Spat Inf Sci 29(1):678–695. doi:10.1080/10095020.2025.2513650.
• Chen J, Song Z, Zhang Y, Ding J, Jiang X, Yang S, Hou Y (2025) Clock systematic jump estimation and URA refinement of BDS-3 B2b real-time precise point positioning service. GPS Solut 29, 73. doi:10.1007/s10291-025-01835-7.
• Bai Q, Kong Q, Mi X, Chen W, Ding J, Huang Y, Li M, Li Q (2025) Evaluation and analysis of the precipitable water vapor in Inner Mongolia of China. Earth Planets Space 77, 24. doi:10.1186/s40623-025-02157-1.
• Tang W, Chen J, Zhang Y, Ding J (2024) Analysis of GNSS/Pseudolite integrated positioning accuracy in urban canyon environment. 14th International Conference on Indoor Positioning and Indoor Navigation (IPIN) Kowloon, Hong Kong. doi:10.1109/IPIN62893.2024.10786141.
• Ding J (2024) Research on GNSS tropospheric delay modeling and spatial-temporal characteristics analysis of bias. Acta Geod Cartogr Sin (Abstract of PhD thesis, CN) 53(8):1659–1659. doi:10.11947/j.AGCS.2024.20230177.
• Tang W, Chen J, Zhang Y, Ding J and Song Z (2024) Refined troposphere delay models by NWM ray-tracing for pseudolite positioning system and their performance assessment. Adv Space Res 73(10):5017–5030. doi:10.1016/j.asr.2024.02.034.
• Song Z, Chen J, Zhang Y, Yu C and Ding J (2023) Real-time multi-GNSS precise point positioning with ambiguity resolution based on the BDS-3 global short-message communication function. GPS Solut 27, 136. doi:10.1007/s10291-023-01477-7.
• Ding J Chen J, Tang W and Song Z (2022) Spatial-temporal variability of global GNSS-derived PWV (1994–2020) and climate implications. Remote Sens 14(14), 3493. doi:10.3390/rs14143493.
• Cui J, Chen J, Wang B, Yu C, Ding J and Wang R (2022) Characteristic analysis of satellite DCB products provided by CAS and DLR. Prog Astron (CN) 40(3):429–440. doi:10.3969/j.issn.1000-8349.2022.03.08.
• Ding J, Chen J and Tang W (2022) Increasing trend of precipitable water vapor in Antarctica and Greenland. China Satellite Navigation Conference 2022, Lecture Notes in Electrical Engineering pp 286–296. doi:10.1007/978-981-19-2588-7_27.
• Chen J, Zhang Y, Yu C and Ding J (2022) Processing algorithms and performance evaluation of BDS RDSS location reporting service. Acta Geod Cartogr Sin (CN) 51(4):511–521. doi:10.11947/j.AGCS.2022.20220024.
• Tang W, Chen J, Yu C, Ding J and Wang R (2021) A new ground-based pseudolite system deployment algorithm based on MOPSO. Sensors 21(16), 5364. doi:10.3390/s21165364.
• Ding J and Chen J (2021) Accuracy variability of GNSS PWV in the range of small and medium scale areas. China Satellite Navigation Conference 2021, Beijing, China. doi:10.26914/c.cnkihy.2021.002146
• Chen Q, Chen J, Yu C, Zhang Y and Ding J (2020) Comparison of BDS station clock short-term prediction models and their applications in precise orbit determination. Chin Astron Astrophys 44(2):258–268. doi:10.1016/j.chinastron.2020.05.008.
• Ding J and Chen J (2020) Assessment of empirical troposphere model GPT3 based on NGL’s global troposphere products. Sensors 20(13), 3631. doi:10.3390/s20133631.
• Chen J, Wang J, Wang A, Ding J and Zhang Y (2020) SHAtropE—A regional gridded ZTD model for china and the surrounding areas. Remote Sens 12(1), 165. doi:10.3390/rs12010165.
• Ding J, Chen J and Wang J (2020) Quality control method for ZTD modeling based on GNSS observation data. J Astronaut (CN) 41(9):1195–1203. doi:10.3873/j.issn.1000–1328.2020.09.010

Academic Reports

• International Association of Professionals in Global Navigation Satellite Systems (CPGNSS) Forum 2025, Oral, 19–20 Jul., 2025, Nanchang.
• Croucher Advanced Study Institute (ASI)——Revolutionizing Weather Forecast and Climate Prediction Through Artificial Intelligence, Poster, 19–21 Sep, 2024, Hong Kong
• European Navigation Conference (ENC 2023), Oral, 31 May–2 June, 2023, Noordwijk, Netherlands.
• China Satellite Navigation Conference (CSNC 2022), Oral, 25–27 May, 2022, Beijing.
• EGU General Assembly 2022 (EGU 2022), Oral, 23–27 May, 2022, Vienna, Austria.[link][pdf]
• 4-th Congress of China Geodesy and Geophysics (4-th CCGG), Oral, 17–18 July, 2021, Qingdao. [link]
• Scientific Assembly of the International Association Geodesy (IAG 2021), Oral, 28 June – July 2, 2021, Beijing. [link][pdf]
• International Association of Professionals in Global Positioning Systems (CPGPS) Forum 2020, Oral, 12–15 Nov., 2020, Shanghai. [link]

Invited Talks

• Generation and evaluation of high-precision satellite navigation tropospheric products based on AI foundation models, 20-26 Sep., 2024, Chang’an University, Xi’an, China.
• Space geodetic tropospheric delay forecasting based on foundation models, 23 Oct., 2025, Sun Yat-sen University, Zhuhai, China.

Honors & Awards

• Postdoc Matching Fund of PolyU (2024-2026)
• Outstanding Graduates of Shanghai (2023)
• National Scholarship for Doctoral Students, CNY 30K (2022)
• Zhu-Li-Yuehua Outstanding Doctoral Scholarship of CAS, CNY 5K (2022)
• First Class Academic Scholarship of UCAS, CNY 15K (2021, 2022)
• Merit Student of University of Chinese Academy of Sciences (2020, 2021, 2022, 2023)
• Individual Scholarship of Chang’an University, CNY 500 (2017)
• The Third Prize of the 10th Challenge Cup Competition of Chang’an University (2017)
• The First Prize of the 10th Challenge Cup Competition of Chang’an University (2017)
• National Scholarship for Encouragement, CNY 5K (2016)
• The Third Prize of the 4th ACM-ICPC in Shaanxi Province (2016)
• The HI-TARGET Scholarship, CNY 3K (2015)
• Ding Family “Zhong Cheng” Education Scholarship, CNY 2.6K (2014)
• Top 30 Scholarship (Full tuition & fees waiver for 3 years high sclool) over CNY 10K (2011-2014)
• The National Third Prize of the 21st National Applied Physics Knowledge Contest (2011)

Journal Reviewer

Journal of Geodesy GPS Solutions Atmospheric Research Geo-spatial Information Science Atmospheric Chemistry and Physics Pure and Applied Geophysics Mediterranean Geoscience Reviews

Earth-Science Reviews Advances in Space Research Geodesy and Geodynamics Geoscience Letters Remote Sensing Scientific Reports Sensors

npj Geoinformatics Space Weather Measurement IEEE TGRS IEEE TAES IEEE J-STARS IEEE GRSL