[IGSMAIL-8754] Open-source software to fix day-boundary discontinuities of GNSS satellite products

[Jianghui Geng]

Dear colleagues,

We are pleased to release an open-source software package, PRIDE DBAlign (https://github.com/PrideLab/PRIDE-DBAlign), developed by the PRIDE Group (http://pride.apm.ac.cn <http://pride.apm.ac.cn/>, or https://pride.whu.edu.cn <https://pride.whu.edu.cn/>). PRIDE DBAlign is used to mitigate the day-boundary discontinuity of GNSS precise satellite orbit/clock/bias products. Such discontinuities are usually imputed to the high-precision GNSS data processing normally split into daily batches. We make this software open to the general public and relevant professionals with the goal of promoting the implementation of the United Nations (UN) International Committee on GNSS (ICG) recommendation in 2025, “Continuous GNSS Time Transfer across Day Boundaries using IGS Products” (https://www.unoosa.org/documents/pdf/icg/2025/ICG-19/ICG-19_WG-D_Recommendation_B_.pdf). In particular, PRIDE DBAlign is able to align precise GPS/Galileo/BDS satellite products across day boundaries to keep PPP ambiguities continuous beyond the midnight epochs. A new quantitative index, DOCB (Discontinuity of orbits, clocks and biases), is then calculated as a diagnostic of the mitigation performance and appended to the Bias-SINEX bias product files. As a result, GNSS kinematic positioning and time/frequency transfer across days, using PRIDE PPP-AR or other capable PPP software based on these mitigated products, could be improved by avoiding those long-existing day-boundary discontinuities. In this case, PRIDE DBAlign would be useful especially to the International GNSS Service (IGS) Analysis Centers, who are responsible to generating precise GNSS orbits, clocks and biases for geosciences applications. The development of PRIDE DBAlign has been funded by the National Science Foundation of China (No. U25D8020) and endorsed by the IGS Wuhan Combination Center (WCC, https://igs.org/wg/wcc), the IGS Bias & Ambiguity Resolution Committee (BAR, https://igs.org/wg/bias-and-ambiguity-resolution/), and the International Association of Geodesy (IAG) Sub-Commission 4.2.

Please refer to the following publications for more technical details,
Lin J, Geng J, Zhang Q (2025) Aligning GPS/Galileo/BDS satellite integer clock products across day boundaries for continuous time and frequency transfer. J Geod 99, 35. doi:10.1007/s00190-025-01955-5
Wen Q., Geng J., Deng Y., Zhang Y. (2025) Validating the IGS products in mitigating day-boundary discontinuities of kinematic positioning and time transfer. GPS Solut 29, 170.  doi:10.1007/s10291-025-01929-2
Geng J, Wang Y, Wen Q, Lin J, Tagliaferro G (2026) Quantifying all-frequency day-boundary discontinuities for GPS/Galileo/BDS satellite products. (under review)

Please do not hesitate to contact us if you find any problems with the software and its usage.

Best,
Jianghui Geng on behalf of the PRIDE team
Professor in GNSS Geodesy
Director of State Key Laboratory of Precision Geodesy,
APM, Chinese Academy of Sciences, Wuhan, China
Email: jgeng at apm.ac.cn
Office: +86 (0)27 68881316
Homepage: http://pride.apm.ac.cn
SKL hpage: https://sklpg.apm.ac.cn

Earn the right to be wrong











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