Modified Tomographic Estimation of the Ionosphere using Fewer Coefficients May 1, 2004· Youngho Sohn Changdon Kee · 0 min read DOI Last updated on May 1, 2004 Authors Youngho Sohn Ph.D Authors Changdon Kee Professor ← The Need for Range Rate Correctionsin DGPS Correction Messages Sep 1, 2004 Line-of-Sight 단위벡터 오차가 의사위성 항법시스템에 미치는 영향 분석 Apr 1, 2004 →