欧美孕妇excels交In April 1970, China's first satellite was successfully launched into the pre-defined orbit. Since then China has developed more communications satellites. Up to now, Dongfanghong series of geo-synchronous orbit communications satellites has been successfully developed, namely DFH-2, DFH-2A, DFH-3 and DFH-4. DFH-2 and DFH-2A are spin-stabilized satellites, and DFH-3 and DFH-4 are 3-axis stabilized satellites.
DFH-4 Bus Profile
DFH-4 is the third generation communications satellite bus in China with high power, strong payload capacity and extended service life. It consists of propulsion module, service modules and solar arrays.