gq: BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each.
Question: What is the BeiDou-1? Question: The BeiDou-1 is made up of how may satellites? Question: How many satellites in the BeiDou-1 system is used for back up? Question: What were the BeiDou-1 system satellites based on? Question: How much did each satellite for the BeiDou-1 system weigh?