October-November 2020: The installation of the VHF radar in Ledong
August 2020: BG2 GNSS TEC monitor installation along the 40°N chain
August 2019: BG2 GNSS TEC monitor installation around Hainan Island
May 2019: Relocation of the Sanya VHF radar at Ledong station
June 2019: PDI and GNSS TEC/scintillation monitor installed on Meiji Island
April 2019: PDI installation in Sanya and Ledong for short-distance oblique detection
July-August 2018: the installation of GNSS monitor along the 110°E chain
March-April 2018: the installation of GNSS monitor along the 23°N chain
