Future Satellite Navigation System: Wide-area Augmentation System (WAAS) Jun 1, 1996· Changdon Kee , Lawrence , Chao , Y. C. , Tsai , Y. J. , Evans , J. , Barrows , A. , Walter , T. , Powell , D. , Enge , P. , Parkinson , B. W. · 0 min read Last updated on Jun 1, 1996 Authors Changdon Kee Professor ← Detection and Estimation of Multipath Error in GPS Pseudorange Measurements using Signal-To-Noise Ratio in a Stationary Single-Frequency Receiver Jun 1, 1996 Generation of Ionospheric Error and Confidence Estimates for WAAS Jun 1, 1996 →