On October 29, 2025 (Beijing Time), the IGS Bias and Ambiguity Resolution (BAR) Committee convened its inaugural meeting. The BAR Committee, which integrates the former "Bias & Calibration Working Group" and "the PPP-AR Pilot Project", has its core objective of coordinating the research, standardization, validation, and dissemination of satellite bias products for existing GNSS and future LEO satellites. Researcher Jianghui Geng from the PRIDE Research Group chaired the inaugural meetings.

Dr. Wen Qiang from the PRIDE Research Group delivered a report titled Progress Report of the PPP-AR Pilot Project for 2024/2025, reviewing the work of the PPP-AR Pilot Project over the past year regarding orbit/clock/biases products. This year, BDS-3 PPP-AR product was included in the final combined product, thanks to the release of the HUS final BDS products. PPP-AR products from other Analysis Centers (ACs) of the IGS have also been updated. Specifically, EMR provides GPS code and phase OSBs in its OPS final products. WUM’s MGEX final products include QZSS phase OSBs, while GFZ MGEX rapid and GRG MGEX final products include code and phase OSBs for BDS satellites with PRN numbers higher than C46 (C47-C50).

Additionally, during the meeting, Lotfi Massarweh from Delft University of Technology introduced the background, core objectives, work tasks, and charter of the newly established BAR Committee. Peter Steigenberger from the German Aerospace Center shared his research findings on the impact of GPS Flexible Power on the continuity of DCB estimation. Dr. Jiang Guo from the International Bureau of Weights and Measures presented his research on time transfer using continuous precise products.

In the final discussion session of the meeting, participants focused on the future core work directions, technical challenges, and user needs of the IGS-BAR Committee. Key topics included GNSS flexible power, day-boundary bias handling methods, phase biases quality, and the development of the BAR official website.

Over 60 experts, scholars, and researchers in the field of GNSS precise positioning from around the world attended the inaugural meeting. Through this meeting, all participants gained a clearer understanding of the BAR Committee’s work directions, PPP-AR technology progress, and the application of biases products. This will provide important guidance for the subsequent upgrade of GNSS high-precision services and the support for the development of LEO system.