Geometry-free single-epoch resolution of BDS-3 multi-frequency carrier ambi-guities
ZHANG Zhetao, LI Bofeng, HE Xiufeng
Acta Geodaetica et Cartographica Sinica . 2020, (9): 1139 -1148 .  DOI: 10.11947/j.AGCS.2020.20200325