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China returns from Spring Break with Zhongxing-6C launch – NASASpaceFlight.com

After the long break due to the Spring Festival, China resumed orbital launch operations with the launch of a new communications satellite through a long March 3B. The Zhongxing-6C (or ChinaSat-6C) communications satellite was launched at 16:28 UTC Saturday from the LC3 Launch Complex in Xichang Satellite Launch Center. The launch marked the 300th orbital launch of the Long March family of launch vehicles.Originally planned to start in September 2017, Zhongxing-6C (ZX-6C) was developed by the Chinese space engineering academy and is based on DFH-4 satellite platform. The new satellite is equipped with twenty-five C-band transponders that support high quality and reliable uplink and downlink transmissions of programs for radio, TV stations and cable TV networks. It will be located at 1 30 ° East. DFH-4 is the third generation communication satellite solution in China with high power, high payload capacity and longer life. It consists of a propulsion module, service modules and sun rails. Its dimensions are 2360mm × 2100mm × 3600mm, with a liftoff mass of 5,200kg. Solar Array Power is 10.5 kW (EOL) and payload is 8 kW. The platform can be equipped with C, Ku, Ka and L transponders. It uses a 3-axis stabilization mode and its station keeps precision is west / east ± 0.05 ° and north / south ± 0.05 °. Antenna point precision <0.1 °. Life expectancy in circulation is expected to be 15 years. To meet the demand for the international satellite launch market, especially for high power and heavy communication…

After the long break due to the Spring Festival, China resumed orbital launch operations with the launch of a new communications satellite through a long March 3B. The Zhongxing-6C (or ChinaSat-6C) communications satellite was launched at 16:28 UTC Saturday from the LC3 Launch Complex in Xichang Satellite Launch Center. The launch marked the 300th orbital launch of the Long March family of launch vehicles.

Originally planned to start in September 2017, Zhongxing-6C (ZX-6C) was developed by the Chinese space engineering academy and is based on DFH-4 satellite platform.

The new satellite is equipped with twenty-five C-band transponders that support high quality and reliable uplink and downlink transmissions of programs for radio, TV stations and cable TV networks. It will be located at 1

30 ° East.

DFH-4 is the third generation communication satellite solution in China with high power, high payload capacity and longer life. It consists of a propulsion module, service modules and sun rails. Its dimensions are 2360mm × 2100mm × 3600mm, with a liftoff mass of 5,200kg.

Solar Array Power is 10.5 kW (EOL) and payload is 8 kW. The platform can be equipped with C, Ku, Ka and L transponders. It uses a 3-axis stabilization mode and its station keeps precision is west / east ± 0.05 ° and north / south ± 0.05 °. Antenna point precision <0.1 °. Life expectancy in circulation is expected to be 15 years.

To meet the demand for the international satellite launch market, especially for high power and heavy communication satellites, the development of the Long March-3B launch vehicle (Chang Zheng-3B) was launched in 1986, based on the long-range launch technology of Long March.

Developed from Chang Zheng-3A, Chang Zheng-3B is currently the most powerful launch vehicle on the Chinese spacecraft fleet. 19659009] The CZ-3B has magnified starter drive tanks, improved computer systems, a larger payload of 4.2 meters, and the addition of four belt boosters in the core stage that provide extra help during the first phase of the launch. [19659003] The rocket can launch a 11,200 kg satellite to a low ground or a 5,100 kg load to a geosynchronous transmission path.

The launch vehicle CZ-3B / G2 (Enhanced Version) was developed from the CZ-3B with a lower first core stage length and rem-on boosters, increasing the GTO capacity up to 5,500 kg.

On May 14, 2007, the first flight CZ-3B / G2 was successfully completed, and NigcomSat-1 sent it correctly to a predetermined orbit. With the GTO launch capability of 5,500kg, the CZ-3B / G2 is designed to launch a large GEO communications satellite.

The rocket structure also combines all subsystems together and consists of four belt boosters, a first step, a second stage, a third stage and a payload.

Long March 3B at an earlier launch – via Chinese state media

The first two stages, as well as the four belt boosters, use hypergolic (N2O4 / UDMH) fuel while the third stage uses cryogenic (LOX / LH2) fuel. The total length of the CZ-3B is 54,838 meters, with a diameter of 3.35 meters on the core stage and 3.00 meters in the third stage.

In the first step, the CZ-3B uses a YF-21C engine with a 2.961.6 kN traction and a specific impulse of 2.556.5 Ns / kg. The first step diameter is 3.35 m and the stage length is 23.272 m.

Each belt booster is equipped with a YF-25 engine with a power of 740.4 kN and a specific impulse of 2,556.2 Ns / kg. The tire support diameter is 2.25 m and the tire support length is 15.326 m.

The second stage is equipped with a YF-24E (main engine – 742 kN / 2.922.57 Ns / kg, four tire motors – 47.1 kN / 2.910.5 Ns / kg each). The second stage diameter is 3.35 m and the stage length is 12.920 m.

The third stage is equipped with a YF-75 engine that develops 167.17 kN and with a specific impulse of 4.295 Ns / kg. The CZ-3B mounting diameter is 4.00 meters and has a length of 9.56 meters.

The CZ-3B can also use the new Yuanzheng-1 (“Expedition-1”) upper stage that uses a small thrust of 6.5 kN engine that burns UDMH / N2O4 with its specific impulse at 3,092 m / s. The upper stage can perform two burns, which have a lifespan of 6.5 hours and can achieve a variety of paths. This upper stage was not used in this launch.

The typical flight sequence of the CZ-3B / G2 sees the launch for 10 seconds after charging from the Xichang Satellite Launch Center. Boosters shutdown 2 minutes and 7 seconds after liftoff, separation from the first step one second later. First step shutdown occurs at 1 minute 25 seconds into the flight.

The separation between the first and second stages occurs at 1 minute 26 seconds after fault separation at T + 3 minutes 35 seconds. Step 2 main engine shutdown occurs 326 seconds in flight, followed by shutdown of the guard motors 15 seconds later.

Separation between the second and third stages and the ignition of the third stage takes place one second after the shutdown of the Vernier engines in the second stage. The first burn of the third stage will be for 4 minutes and 44 seconds.

After the end of the first burn in the third stage, a coastal phase ends at T + 20 minutes and 58 seconds with the third stage initiating its second burn. This will last for 179 seconds. After the end of the second burn in the third step, the starter initiates a 20 second speed adjustment operation. Separation of spacecraft usually takes place at T + 25 minutes 38 seconds after the start.

Xichang Satellite Launch Center is located in Sichuan Province, southwest China and is the country’s launch site for geosynchronous orbital starts.

Xichang Satellite Launch Center

Equipped with two launch plates (LC2 and LC3), the center has a dedicated railway and motorway directly to the launch site.

The Command and Control Center is located seven kilometers southwest of the launch pad, which provides flight and security control during launch exercise and launch.

Other facilities at Xichang Satellite Launch Center are the launch center, propellant for propellants, communication system for start command, telephone and data communication for users and support equipment for meteorological monitoring and forecasting.

The first launch from Xichang took place at 12: 25UT on January 29, 1984, when Chang Zheng-3 (Y1) w who launched Shiyan Weixing (14670 1984-008A) circulated communication satellites.

Next orbit launch from China may be the initial launch of OneSpace Tech. OS-M orbital launch vehicle that will pave the Lingque-1B small satellite from the Jiuquan Satellite Launch Center on March 25.

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