Centimeter precise orbit determination for the Swarm satellites via undifferenced kinematic method
ZHANG Bingbing, NIU Jiqiang, WANG Zhengtao, XU Feng, TIAN Kunjun
Acta Geodaetica et Cartographica Sinica . 2021, (1): 27 -36 .  DOI: 10.11947/j.AGCS.2021.20190165