Invited by State Key Laboratory of Geodesy and Earth`s Dynamics (SKLGD), Doctor Jim Ray from NGS visited Institute of Geodesy and Geophysics (IGG) and gave an academic report as Subseasonal GNSS Errors in IGS Products on January 5. The meeting was hold by vice director of IGG Sidao Ni, present at the meeting were vice director of IGG Wang Yong and other researchers.

The report represented the progress of analyzing subseasonal errors in GNSS positioning time series, focused on analyzing signals mixture of GNSS positioning, and also compared different results from different GNSS data analysis centers using spectral analysis.

Doctor Ray also visited the International GNSS Monitoring & Assessment System (IGMAS) in Institute of Geodesy and Geophysics (IGG). He inquired the states of precise orbit determination and clock determination in daily process and gave some valuable suggestions.

Doctor Jim Ray giving the report