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.
What were the BeiDou-1 system satellites based on?
{'text': 'the Chinese DFH-3 geostationary communications satellite', 'answer_start': 183}