Precise point positioning with quad-constellations: GPS, BeiDou, GLONASS and Galileo - ScienceDirect
GPS + Glonass vs GPS + Galileo vs GPS only! What do you guys use? : r/Garmin
HGLRC M80 GPS Mini GPS Module Supports GPS,GLONASS,GALILEO,QZSS,SBAS,BDS for RC Drone FPV Racing Models Part & Accessories|Parts & Accessories| - AliExpress
Remote Sensing | Free Full-Text | Intersystem Bias in GPS, GLONASS, Galileo, BDS-3, and BDS-2 Integrated SPP: Characteristics and Performance Enhancement as a Priori Constraints | HTML
Satellite navigation systems (GNSS): GPS, BDS, GLONASS, GALILEO