Flight Test of Helicopter Landing System Using Real-Time DGPS Sep 1, 1999· Changdon Kee Sungmin Park Jeonghan Kim Deokho Hwang Jaegyu Jang , Hyeongtaek Park , Hongman Park , Changhyo Lee · 0 min read Last updated on Sep 1, 1999 Authors Changdon Kee Professor Authors Sungmin Park Ph.D Authors Jeonghan Kim Ph.D Authors Deokho Hwang M.S Authors Jaegyu Jang Ph.D ← Development of Real-time SNUDGPS via Ionospheric and Tropospheric Corrections Sep 1, 1999 GPS를 이용한 항공기 이착륙시스템 Aug 1, 1999 →