On Februuary 26th, 2024. An academic report was given at the 1410 meeting room in the GNSS Center building. Guo Jiang, who is a postdoctoral at the Royal Observatory of Belgium, is invited to give this report to the staff of the GNSS Center. The title of this report is "Time-frequency transfer based on PPP processing with multi-GNSS continuous precise products"
    Guo Jiang was a doctor at GNSS Center graduated in 2022, and then became a postdoctor at the Royal Observatory of Belgium. Now he is engaged in maintaining the stability of Coordinated Universal Time. This work is led by Bureau International de l'Heure (BIH), and conventionally optical link or Bidirectional time-frequency transfer method is used to link atomic clock devices, thus an averaged clock datum can be obtained. In this condition, atom clock devices cannot be far too far apart from each other. As integer precise point positioning (IPPP) nowadays can lead to a millimeter-level solution on a global scale, it turns out to be a promising approach for maintaining the clock datum. Guo uses IPPP techniques to get over the limitation of distance, and the accuracy of time-transfer solutions can reach a picosecond level.
    At the meeting room, Professor Geng Jianghui delivered a welcome speech. Professor Nie Guigen and many students listened to the report. Some academic details of the report were discussed during the session. Lin Jihang communicated with Guo on the theories and techniques of time-frequency transfer. They both benefit from the conversation and express the desire for further cooperation in academic research.