Wide Area Differential GPS Nov 1, 1996· Changdon Kee , Axalrad , P. , Parkinson , B. W. · 0 min read Last updated on Nov 1, 1996 Authors Changdon Kee Professor ← Effect of Error in Unit Vector on DGPS Positioning Accuracy Jan 1, 1997 미래의 항법장치: 광역위성 항법장치(WAAS) Nov 1, 1996 →