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ST 1, 1B (ZX 20, 20A)

ST-1 [CAST]

The ST 1 (Shen Tong 1) series satellites are reportedly chinese military comsats. ST 1 is the first Chinese satellite to provide the Ku-band communication and to feature advanced multiple steerable spot beam antenna technology to enable ground users to communicate while on the move as well as secured uplink transmission for satellite antenna control. It has the most powerful onboard data processing capability of chinese comsats up to this date.

China Aerospace Science and Technology Corp. manufactured the satellites based on the DFH-3 Bus. The launch vehicle was the CZ-3A rocket.

The larger ST 2 series are their successors.

Nation: China
Type / Application: Communication
Operator: People's Liberation Army (PLA)
Contractors: CAST
Equipment: C-band and Ku-band transponders
Configuration: DFH-3 Bus
Propulsion: ?
Power: 2 deployable solar arrays, batteries
Lifetime:
Mass: 2300 kg
Orbit: GEO
Satellite COSPAR Date LS Launch Vehicle Remarks
ST 1 (ZX 20, ChinaSat 20) 2003-052A 14.11.2003 Xi LC-2 CZ-3A
ST 1B (ZX 20A, ChinaSat 20A) 2010-064A 24.11.2010 Xi LC-3 CZ-3A