“Performance Improvement of Grid Ionospheric Delay Correction Based on Multiple Constellations for Single-Frequency SBAS User Apr 1, 2015· Donguk Kim Deokhwa Han Ho Yun Changdon Kee , Seungwoo Seo , Junpyo Park · 0 min read Last updated on Apr 1, 2015 Authors Donguk Kim Ph.D Authors Deokhwa Han Ph.D Authors Ho Yun Ph.D Authors Changdon Kee Professor ← “Feasibility Analysis of Real-Time FKP-DGPS Algorithm for L1 Single-Frequency GPS Receiver in Korea Apr 1, 2015 Coarse Initial Orbit Determination for a Geostationary Satellite Using Single-Epoch GPS Measurements Apr 1, 2015 →