New progress of PPP/PPP-RTK and positioning performance comparison of BDS/GNSS PPP
ZHANG Xiaohong, HU Jiahuan, REN Xiaodong
Acta Geodaetica et Cartographica Sinica . 2020, (9): 1084 -1100 .  DOI: 10.11947/j.AGCS.2020.20200328