“Precise Orbit Determination of LEO Satellites with Less than Four Visible GPS SatellitesOct 1, 2014·Sunkyoung YuGhangho KimChangdon Kee· 0 min readLast updated on Oct 1, 2014 AuthorsSunkyoung YuPh.DAuthorsGhangho KimPh.DAuthorsChangdon KeeProfessor Emeritus← “Performance of Single-antenna GPS-based Attitude integrated with Gyroscope and Magnetometer under GPS Outage Oct 1, 2014“Smartphone based 3D PDR System Development and its Performance Analysis in Various Indoor Environment Oct 1, 2014 →