Data quality analysis of GNSS multi-system based on G-nut／Anubis

Aiming at the problem of GNSS observation data quality analysis in surveying and mapping application research, this paper uses G-nut／Anubis to check the data availability, multipath effect, cycle slip ratio and other indicators of the quality of each station's GNSS system data, and output  visualization result for further analysis, and select good quality observation satellites to provide  reference for later data calculation.