ChinaSat-2D (ZX-2D, ST-2D)

ChinaSat-2D (ZX-2D / Shentong-2D, ST-2D) is a Chinese geostationary military communications satellite operated by the People’s Liberation Army (PLA) as part of the Shentong (ST) secure communications satellite network.

The satellite was developed by the China Academy of Space Technology (CAST) under the China Aerospace Science and Technology Corporation (CASC). It is widely believed to be based on the DFH-4 (Dongfanghong-4) platform, a high-power, long-life satellite bus designed for advanced communications missions in geostationary orbit.

ChinaSat-2D was launched on 15 January 2019 aboard a Long March 3B (CZ-3B) rocket from the Xichang Satellite Launch Center. After a successful launch, the satellite was placed into geostationary orbit (GEO), providing continuous coverage over China and strategically important regions.

As part of the Shentong-2 series, ChinaSat-2D represents a further evolution of China’s military communications capabilities, building on earlier ST-2 satellites with improved performance and resilience. The satellite is believed to carry multi-band communications payloads, likely including C-band, Ku-band, and UHF, enabling flexible and secure connectivity for a wide range of military users.

Key capabilities include:

• Secure and encrypted military communications
• Anti-jamming and high-reliability transmission
• Support for mobile, maritime, and remote ground forces
• Strategic command and control communications

The primary users are PLA military units, defense communication networks, and government agencies, making ChinaSat-2D a critical asset in China’s space-based military communications infrastructure.

A key milestone of the satellite is its role in strengthening and expanding the Shentong constellation, improving redundancy, coverage, and bandwidth for China’s military communications network.

Looking ahead, ChinaSat-2D contributes to China’s broader strategy of developing integrated, resilient, and high-capacity space communication systems, working alongside other assets such as Tianlian data relay satellites and the Beidou navigation system, enabling increasingly advanced, network-centric military operations.