George Liu’s research interests include new algorithm development for precise Global Positioning System (GPS) and Global Navigation Satellite System (GNSS), GPS/GNSS precise point positioning (PPP), ionosphere modelling and scintillation monitoring, tropospheric remote sensing and modelling, and GPS/GNSS meteorology. He has over 20 years of experience in GPS/GNSS research. His group has developed a highly efficient and effective algorithm of cycle slip detection and repair for dual- and multi-frequency GNSS carrier phase data. The algorithm his group developed can improve the accuracy of water vapor retrieval from remote sensing satellite data by up to 50%. His group developed China’s first GPS PPP-based Precipitable Water Vapor Real-time Monitoring System in the Pearl-River-Delta region in 2012. In the same year, the group established Hong Kong’s first GPS/GNSS-based ionosphere scintillation monitoring system (two stations deployed in South and North Hong Kong) with his collaborators. His research group also established Hong Kong’s first GPS/GNSS-radiosonde water vapor sounding collocation system in 2013 in collaboration with the Hong Kong Observatory.

Liu was the recipient of the inaugural Early Career Award of the Hong Kong Research Grants Council (RGC), Hong Kong, in 2012 and was the recipient of the inaugural Best Conference Paper of the China Satellite Navigation Conference (CSNC), China, in 2013. In 2014, he was nominated by the Hong Kong Observatory for the World Meteorological Organization (WMO) “Norbert Gerbier-MUMM International Award for 2015” for his paper that developed a method to evaluate the absolute accuracy of water vapor measurements.