Wide Area Differential GPS Jun 1, 1991· Changdon Kee , Axalrad P , Bradford Parkinson · 0 min read DOI Last updated on Jun 1, 1991 Authors Changdon Kee Professor ← High Accuracy GPS Positioning in the Continent: Wide Area Differential GPS Apr 1, 1993 “Implementation and Outdoor Test Results for GPS and Pseudolite System Jan 1, 0001 →