Ground Calibration with Orthogonality Correction for Tri-Axis Fluxgate Magnetometer for CAS500-3 by Dooyoung Choi, Seunguk Lee, Jimin Hong, Su-Hwan Park, SeongOg Park, Wonho Cha, Jinkyu Kim, Bonju Gu, Po Gyu Park, Sungjung Joo, Cheong Rim Choi, Dae-Young Lee, Kwangsun Ryu