March 8, 2010 - China Launches Communication Satellite for Broadcasting Services

On March 8, 2010, you can trace a key moment in China's broadcasting history when a Long March 3A rocket launched the ChinaSat 20A satellite from Xichang into geostationary orbit at 110.5° East. The mission restored and expanded C-band and Ku-band TV and radio services across Asia-Pacific, reaching remote and mountainous regions. It carried 24 C-band transponders and rode a proven DFH-3 platform — and there's far more to this story than the launch itself.

Key Takeaways

• China launched the ChinaSat 20A (Zhongxing 20A) broadcasting satellite on March 8, 2010, from Xichang Satellite Launch Center.
• The satellite was carried by a Long March 3A rocket and inserted into geostationary transfer orbit targeting 110.5° East.
• ChinaSat 20A was built by CAST on a DFH-3 platform, weighing approximately 5,000 kg with a 15-year design life.
• The satellite carried 24 C-band transponders to relay TV and radio signals to remote and mountainous regions across Asia-Pacific.
• The mission restored C-band and Ku-band broadcasting capacity, supporting major broadcasters, ethnic broadcasting, and various civil applications.

The 2010 Chinasat Mission China Needed to Succeed

On November 25, 2010, China launched ChinaSat 20A (ST-1A) aboard a Long March 3A rocket from Xichang's LC2 launch site, successfully placing the DFH-3B-based satellite into geosynchronous orbit at 110.5° East.

You can see why this mission mattered — it replaced the aging ChinaSat 20 from 2003, restoring critical C-band and Ku-band broadcasting capacity across the Asia-Pacific region.

Built by CAST for CASC, the satellite balanced private funding interests alongside state objectives, supporting both commercial and military communications.

China also navigated international regulations governing orbital slot assignments to secure its 110.5° East position. Much like Marconi's wireless technology proved critical during the RMS Titanic disaster in 1912, demonstrating the life-saving potential of reliable long-distance communication at sea, satellites such as ChinaSat 20A serve as modern extensions of that same imperative for uninterrupted global connectivity.

As the seventh successful DFH-3 mission, it cemented a 100% series success rate while bridging China's communications fleet toward the upcoming DFH-4 era. The DFH-3B bus features an extended 15-year designed service life, a significant improvement over the original DFH-3's 8-year design specification.

ChinaSat 10, a related satellite in China's communications fleet, was assigned the NORAD catalog number 37677 upon its entry into Earth orbit.

Why the Long March 3A Was the Right Rocket for This Job

The Long March 3A wasn't chosen arbitrarily for this mission — its three-stage design was purpose-built for exactly this kind of geosynchronous transfer orbit delivery.

You're looking at a rocket that pushes 2.3 tonnes to GEO, nearly doubling what its predecessor managed. That upgrade mattered directly for payload integration, ensuring Zhongxing 20A fit within a proven, reliable delivery system.

Fuel selection also reinforced this choice: the first two stages burn hypergolic UDMH and nitrogen tetroxide for dependable ignition, while the third stage switches to liquid hydrogen and liquid oxygen for precise orbital insertion.

Launching from Xichang, the 3A targets a transfer orbit stretching from 125 miles perigee to 26,000 miles apogee — exactly what a communications satellite bound for geosynchronous orbit requires. The Long March 3A was developed specifically to address shortcomings in its predecessor, as the original Long March 3 suffered multiple third-stage failures tied to gas generator issues that ultimately necessitated a more reliable successor.

The Zhongxing 20A satellite itself is built on the DFH-3 bus, a domestically developed platform produced by the China Academy of Space Technology that has served as the foundation for multiple Chinese communications satellites. Much like the Cold War investment that funded early American satellite development, China's state-driven aerospace program channeled substantial resources into building indigenous launch and spacecraft capabilities that reduced reliance on foreign technology.

Inside the DFH-3 Bus That Powers the Satellite

Powering Zhongxing 20A is the DFH-3 bus, a box-shaped platform measuring 2.20 m x 1.72 m x 2.00 m that China's Academy of Space Technology engineered for geostationary communications duty.

You'll find it divided into three sections: service, propulsion, and communications. Its two deployable solar panels stretch 18.10 m and deliver 2 kW of power, supporting payload integration of 24 C-band transponders across six TV and eighteen communications channels.

Thermal control keeps those transponders operating reliably across an 8-year design lifespan.

The bus uses a 3-axis stabilized platform rather than the spin-stabilization of its DFH-2A predecessor, giving it tighter attitude control and greater capacity.

At orbital mass, the satellite weighs roughly 1,130 kg, making it a compact yet capable geostationary platform. The DFH-3 bus was first flown on 29 November 1994, when the original DFH-3 1 satellite launched aboard a CZ-3A rocket but was ultimately declared lost following an apogee kick motor malfunction. Satellites built on this bus are designed to serve domestic needs including TV broadcasting, telephony, and data transmission services, supporting China's national communications infrastructure from geostationary orbit.

How Geostationary Orbit Delivers Uninterrupted Broadcasting

With the DFH-3 bus keeping Zhongxing 20A stable at its orbital slot, it's worth understanding why that slot sits 35,786 km above the equator in the first place.

Orbital mechanics dictates that at this altitude, a satellite's period matches Earth's 24-hour rotation, making it appear stationary to observers below. That fixed position lets ground antennas lock onto a single point without tracking systems, cutting costs significantly.

User coverage extends across vast continental and oceanic regions, reaching up to 81° latitude before the signal drops below the horizon. This continuous visibility suits broadcasting perfectly, delivering uninterrupted TV and data signals over populated areas. In fact, four GEO satellites are sufficient to achieve coverage of the entire Earth's surface.

The trade-off you'll notice is signal latency, averaging 240 ms round-trip, making geostationary orbit better suited for broadcasting than real-time interactive applications. Without periodic station-keeping maneuvers, lunar and solar gravity would cause inclination drift of ~0.85°/year, gradually pulling the satellite away from its fixed equatorial position. Before satellite-based systems matured, broadcasters and navigators alike depended on ground-based radio systems like LORAN and OMEGA, which lacked the global coverage and precision that orbital platforms eventually made possible.

The Radio and TV Networks This Satellite Was Built to Serve

Zhongxing 20A's primary mission centers on serving China's sprawling broadcast ecosystem, anchored by heavyweights like Hunan Broadcasting System, the country's second-largest state-owned TV network behind China Media Group. Based in Changsha and operating one of China's most-watched channels, Hunan Broadcasting System represents exactly the kind of major operator this satellite's capacity targets.

Beyond flagship networks, you'll find the satellite supports local stations and ethnic broadcasting services reaching underserved communities across China's vast interior. SARFT's infrastructure strategy has always required satellite delivery to connect transmitting stations, cable networks, and regional broadcasters that terrestrial infrastructure can't efficiently reach. With direct satellite TV subscribers projected to surpass 15 million by 2010, Zhongxing 20A arrives at a critical moment when demand for reliable broadcast capacity is accelerating nationwide. The satellite was developed by China Academy of Space Technology and is owned and operated by China Satellite Communications Co., Ltd.

SinoSat-6, launched on September 5, 2010, was similarly designed to serve remote and mountainous regions, greatly improving cultural life for underserved populations through its relay of TV and radio live broadcast signals. Much like Connor McDavid's influence on Canadian sports culture, these broadcast satellites have played a defining role in shaping national identity and connecting communities across vast geographic distances.

Why Xichang Was the Only Logical Launch Site for This Mission

When China needed to get Zhongxing 20A into geostationary orbit, Xichang Space Launch Center wasn't just the preferred option—it was the only one that made sense. Its 28°N latitude delivered the ideal inclination match for GTO insertion, something Jiuquan and Taiyuan simply couldn't offer. Wenchang wasn't operational yet in 2010, leaving Xichang unchallenged.

The site's infrastructure already supported CZ-3A vehicles, and its valley positioning enhanced launch safety by sheltering operations from harsh winds. Officials also prioritized minimizing environmental impact through strategic placement 64-85 km from the city center. That buffer zone protected residents while allowing community outreach programs to involve local Sichuan Province stakeholders in China's space ambitions. The local economy benefited directly from decades of continuous operations dating back to 1984.

The center is operated by the People's Liberation Army Aerospace Force, formally designated as the 27th Experimental Training Base (Unit 63790), reflecting the facility's deep military institutional roots alongside its expanding commercial launch manifest. Tracking and telemetry support for missions is provided by dedicated ground stations at Xichang, Yibin, and Guiyang, supplemented by additional inland stations and Yuanwang tracking ships deployed at sea.

How This Launch Advanced China's Navigation and Broadcast Independence

China's drive for navigation and broadcast independence took a significant step forward with the Zhongxing 20A launch, which bolstered the country's growing Beidou satellite network. You can see how this mission strengthened satellite sovereignty by reducing reliance on foreign systems like GPS.

Three key advances this launch supported:

1. Signal resilience — China's geostationary satellites ensured stable, uninterrupted positioning and broadcast coverage across the Asia-Pacific region.
2. Military and civilian independence — Encrypted Beidou signals gave authorized users secure, domestically controlled navigation access.
3. Broader applications — Sectors including transportation, marine fisheries, and hydrological monitoring gained reliable, indigenous signal support. The Beidou Navigation Satellite System officially went into service on December 27, 2011, marking a landmark moment in China's push for independent positioning capabilities.

China's long-term vision for Beidou extended well beyond regional reach, with the full constellation planned to include 30 MEO satellites alongside five geostationary satellites to achieve global navigation coverage compatible with GPS, Galileo, and GLONASS. This ambition mirrors the broader trajectory of wireless communication history, where Marconi's 1901 transatlantic signal demonstrated that long-distance wireless transmission was viable, fundamentally reshaping how nations invested in independent communications infrastructure.

The Commercial Milestone This Mission Set for Chinese Space

The March 8, 2010 launch didn't just put a satellite in orbit — it marked China's decisive entry into the competitive global commercial launch market.

You can trace real momentum from this mission: it built commercial credibility for the Long March 3B, proving it could deliver heavy payloads precisely into geostationary transfer orbit.

That reliability mattered. It shifted market confidence toward Chinese launch services, attracting foreign clients who'd previously defaulted to Arianespace or Russian providers.

China Satcom's successful deployment of a 5,000 kg-class broadcast satellite demonstrated that domestic operators could compete on the world stage.

The mission's contract value directly strengthened China's commercial space sector, boosted satellite orders by an estimated 20–30%, and laid the commercial foundation that would eventually support the heavier Long March 5 program. China's commercial launch ambitions had deep roots, as Western satellite launches had begun as early as 1988 before the U.S. export embargo reshaped the market in 1998.

Much like Axiom Space's strategy of attaching early modules to the ISS to reduce financial risk, China's incremental approach to commercial launch credibility avoided overextension by building on proven infrastructure before pursuing independent free-flying operations.

The same Long March rocket family underpinning these commercial endeavors would go on to carry China's lunar exploration ambitions, with Chang'e 1 launching in October 2007 as the first mission in China's multi-phase robotic lunar program.