7766 20260108155828.0 10.1007/s10291-024-01728-1 DOI SCART-2026-0036 Guo, Jiang Estimation of the L5 antenna phase center variations of GPS satellites 2024 NO Defraigne, Pascale Geng, Jianghui Song, Xiangyu GPS Solutions 28 2024 pascale.defraigne@ksb-orb.be published in REFERD