Jiahuan Hu is a Postdoctoral Fellow in the Department of Land Surveying and Geospatial Science (LSGS) at The Hong Kong Polytechnic University (PolyU). He received his Ph.D. in Earth and Space Science Engineering from York University, Canada, in 2024 and his M.Sc. degree in Geodesy and Geomatics from Wuhan University, China, in 2020. His main research interests include GNSS precise point positioning, PPP-RTK, atmospheric modeling, and smartphone precise positioning.