China releases Gaofen-3-03 payload on CZ-4C from Jiuquan

China launched a Gaofen satellite on Thursday morning into a Sun-Synchronous Orbit (SSO). The launch took place on a Chang Zheng 4C from the Jiuquan Satellite Launch Center in China. The departure time was confirmed to be 7:47 AM local time on April 7 (23:47 UTC on April 6).

Today’s missionary orbit is 738 x 745 km orbit with an angle of 98.4 °.

The Gaofen 3 satellites were designed and built by the China Academy of Space Technology (CAST). CAST is a division of China Aerospace Science and Technology Corporation (CASC), the state’s first contractor for projects related to the Chinese aerospace sector.

With Gaofen satellites, China has developed its own high -resolution technology. It is part of China’s High-Definition Earth Observation System (CHEOS), and an extension of the High-Definition Earth Observation satellite (HDEOS) program.

The first HDEOS received full funding in 2010 with the ultimate goal of launching six HDEOS satellites to improve visibility for disaster prevention, climate change monitoring. , and economic research. It is believed that the project was used for warfare.

In 2010, the government requested and approved the CHEOS program to introduce space travel systems that could monitor the world. It is inspected by the Earth Observation System and Data Center – China National Space Administration (EOSDC -CNSA) and used for geographic and environmental maps, disaster prevention and surveillance of disaster areas.

Released today is a Gaofen 3 C-band satellite, based on the CS-L3000B blade. They are equipped with Synthetic Aperture Radar (SAR), Moment Control Gyros (CMGs), and a data transmission system. The satellite can be viewed with an image resolution of one meter. It is estimated to live for 8 years and is estimated to weigh close to 2,800 kg. As is usual for the Chinese air program, no further details have been released about today’s price for this announcement.

Chang Zheng left 4C with Gaofen-3-03

Gaofen’s first release took place in April 2013 on a Chang Zheng 2D rocket. Since then, 23 Gaofen satellites have been launched into the Chinese missile field, including the CZ-4, CZ-3, Kauizhou-1A, and CZ-11. These two did not succeed, they started with different types of Kuaizhou rockets.

The starting car for this flight was the Chang Zheng 4C (Long March 4C used around the world). It has three orbital rocket classes and is part of the first generation of Chinese rockets that use N2O4 and UDMH as an oxidizer and fuel for the first stage. Compared to its production line, the CZ-4B, it features a high-cost fairing and a high level of flexibility with the ability to start over.

It has now launched 42 times and is used for SSO and Low Earth Orbit (LEO) missions. It will be replaced below the line with new rockets from the Chinese fleet, such as the re -launched Chang Zheng 6A, when they have the cadence and confidence to support China’s launch.

Aside from those two shortcomings, he has another confident start story. Two incidents were made with missionary Gaofen 10 in August 2016, and missionary Yaogan 33 in May 2019.

The rocket has a height of 45.8 meters with a diameter of 3.35 meters and a diameter of 250,000 kg. It can handle loads up to 4,200 kg in LEO and 2,800 kg in SSO. Evidence shows how much the charge of this satellite requires the SSO power of the CZ-4C to its maximum.

The first stage is the largest and most compact of the launcher, stands 27.91 meters high and has a maximum liftoff of 182,000 kg. It is powered by four YF-21C engines, delivering an output of 2,961.6 kN with an accuracy of 260 seconds.

The Chang Zheng 4C drove off at a park in Jiuquan before launch

The second level is above the first level. After leaving the first stage in an event called Main Engine Cutoff (MECO), the second stage will blow up its engines.

It is 10.9 meters long, uses the same diameter as the first stage, and uses a single YF-22C engine that produces a pulse of 742.04 kN, with a precision of about 300 seconds. Four YF-23C vernier engines are used to steer and steer the second stage in this part of the flight. The catalysts used for this stage include primary stage, UDMH and N2O4. The weight of the second level is 52,700 kg.

At this point of flight, the fairing charge is released from the rocket. The fairing power no longer needs to prevent charge from aerodynamics and heating as the rocket leaves the air. To keep the weight down, the charge was advertised and displayed in the air space.

The third level is only 2.9 meters wide and 14.79 meters long. It is operated by a single YF-40 engine running on UDMH. Because it is used only for final operations and sometimes to create new lights to insert into the correct orbital, it has a pulse of 100 kN with an accuracy of 412 seconds. After his / her work is completed, the payroll is released from the payroll manager so that he / she can carry out his / her own work and process.

The JSLC was opened in 1958. It is one of China’s largest aircraft carriers, currently hosting CZ-2, CZ-4, and CZ-11 rockets. It has three launch pads and six pads and is one of the four largest open spaces in the Chinese airspace. With its location upland, the falling rocks from the eruption constantly threaten villages and residents on the runway, as rockets fly over public areas.

This is the 414th flight of the Chang Zheng family. It was the ninth release this year from China and the fourth release of the CZ-4C of 2022. Earlier this year, it released the Yaogan 34-02 payload and payloads. L-SAR 01A and 01B. All of these missions were successful.

(Photo guide: CZ-4C leaves the Jiuquan Satellite Launch Center with Gaofen-3-03.)

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