Tianlian I-02 (TL-1B) Satellite Overview

Tianlian I-02 is a Chinese geostationary data relay satellite and part of the first-generation Tianlian (Space Relay) satellite system. It is operated by the China Satellite Launch and Tracking Control General (CLTC) and was launched on July 11, 2011, 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 DFH-3 satellite platform, Tianlian I-02 provides real-time data relay, telemetry, tracking, and command (TT&C) services. It enables continuous communication between ground stations and spacecraft operating in low Earth orbit (LEO).

Tianlian I-02 supports key Chinese space missions, including:

• Shenzhou crewed spaceflights
• Tiangong space laboratory operations
• Various Earth observation and scientific satellites

Operating in geostationary orbit (GEO), the satellite significantly reduces communication gaps by providing near-continuous coverage, improving mission safety, efficiency, and data transmission capabilities.

As part of the early Tianlian constellation, Tianlian I-02 played a crucial role in establishing China’s space-based relay communication network, laying the foundation for the more advanced Tianlian II generation.