BeiDou Navigation Satellite System - definition
BeiDou is a Chinese satellite navigation system. It has total 35 satellites (till 2020). Operator of BeiDou Navigation System is CNSA (China National Space Administration). BeiDou is quite different than other satellite systems. Navigation systems such as: GPS, GLONASS and Galileo which uses MEO (Medium Earth Orbit) satellites where BeiDou-1 uses satellites which are in GEO (Geostationary Earth Orbit).