Flight Trials of the Wide-Area Augmentation System (WAAS) Sep 1, 1994· Walter , T. Changdon Kee , Chao , Y. C. , Tsai , Y. J. , Peled , U. , Ceva , J. , Barrows , A. K. , Abbot , E. , Powell , D. , Enge , P. , Parkinson , B. W. · 0 min read Last updated on Sep 1, 1994 Authors Changdon Kee Professor ← Calibration of Multipath Errors on GPS Pseudorange Measurements Sep 1, 1994 Wide Area Differential GPS as a Future Navigation System in the U. S. Apr 1, 1994 →