Hongmin ZhangPhD Student (2022-2026)alumniThesisAdvanced Stochastic Modeling for Urban GNSS PPP-RTK Aided by 3D City ModelProjects3D Map-Aided GNSS (3DMA) for Smartphone and IoT activeResearch PillarsUrban GNSS Reliability and Signal Error Modeling (1) Optimization-Based Estimation and Factor Graphs (1)