The Weight Matrix Determination of Ionospheric Delay Constraintfor Multi-GNSS Precise Point Positioning Using Raw Observations
ZHANG Hui, HAO Jinming, XIE Jiantao, LIU Weiping, ZHOU Yanglin
Acta Geodaetica et Cartographica Sinica . 2018, (3): 308 -315 .  DOI: 10.11947/j.AGCS.2018.20170151