Dr. LIU Zhizhao was invited to visit CACSM

On March 21, Dr. LIU Zhizhao, from the Department of Land Surveying and Geoinfomatics of the Hong Kong Polytechnic University, was invited to visit CACSM. He presented his work on improving the accuracy of GNSS PPP by using water vapor microwave radiometer, including the current research progress of PPP, water vapor microwave radiometer and on using external water vapor to correct the accuracy of PPP, and then had a discussion with the researchers attending the meeting. After that, the two sides discussed about data sharing and exchange of personnel visits, and reached the intention of further cooperation between the Hong Kong Polytechnic University and Wuhan University on GNSS research.