PPP algorithm for multi-frequency GPS/Galileo/BDS-3 with IFCB time-varying characteristic constraints
Yangyang LU, Huizhong ZHU, Bo LI, Jun LI, Aigong XU
Acta Geodaetica et Cartographica Sinica . 2025, (2): 233 -247 .  DOI: 10.11947/j.AGCS.2025.20240183