Wide Area Differential GPS (WADGPS) as a Future Navigation System in the United States Apr 1, 1996· Changdon Kee , B. W. Parkinson · 0 min read DOI Last updated on Apr 1, 1996 Authors Changdon Kee Professor ← Quality Control Algorithms on Wide-area Reference Station for WAAS Jun 1, 1996 An Algorithm for Inter-frequency Bias Calibration and Application to WAAS Ionosphere Modeling Sep 1, 1995 →