Tianlian I-04 Satellite Overview

Tianlian I-04 is a Chinese geostationary data relay satellite and part of the first-generation Tianlian (Space Relay) satellite network. It is operated by the China Satellite Launch and Tracking Control General (CLTC) and was launched on November 22, 2016, aboard a Long March 3C (CZ-3C) rocket from the Xichang Satellite Launch Center.

Developed by the China Academy of Space Technology (CAST) and based on the proven DFH-3 satellite platform, the satellite serves as an upgraded replacement within the original Tianlian constellation. Its mission is to provide real-time data relay, telemetry, tracking, and command (TT&C) services for spacecraft operating in low Earth orbit (LEO).

Tianlian I-04 supports a wide range of Chinese space missions, including:

• Tiangong space station operations
• Shenzhou crewed missions
• Cargo spacecraft and Earth observation satellites

Positioned in geostationary orbit (GEO), the satellite enables near-continuous communication coverage, significantly reducing data transmission gaps and improving mission safety, reliability, and efficiency.

As part of the evolving Tianlian network, Tianlian I-04 enhances China’s space-based relay communication infrastructure, ensuring redundancy and continuity alongside the newer Tianlian II generation satellites.