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