China launches Chang Zheng 4C from Taiyuan with Daqi-1 satellite satellite

A Chang Zheng 4C was released from Launch Complex 9 (LC-9) at the Taiyuan Satellite Launch Center in China at 2:16 AM local time on April 16 (18:16 UTC on April 15) with the Daqi-1 network follow up. .

The Chang Zheng 4C (also known as the Long March 4C) is a small satellite vehicle that is often used by the Chinese program to fly satellites. The CZ-4C has served since 2006 with 41 units (including today) from 43 trials.

The Daqi-1 mission, like other CZ-4C pilots, flew from the Taiyuan deployment center in north-central China, located in Shanxi province, inland according to the Jiuquan network where China launched its first satellite in 1970. Today. the flight travels to the south, ending in the first landing on the ground.

The CZ-4C is a three-car starter car that uses hypergolic dinitrogen tetroxide and unsymmetrical dimethylhydrazine as its oxidizer and fuel, respectively, at all levels. It is comparable to other types of American Delta II or Indian PSLV vehicles in terms of being able to carry in different orbits.

The CZ-4C and other CZ-2/3/4 boosters see their ancestor the Dong Feng-5 ICBM, first tested in the 1970s. As an ICBM, the The DF-5, like the U.S. Air Force’s Titan 2, needs to use storable hypergolic propellants to “start the instruction,” which is why Chang Zheng boosters ’first use of N2O4 / UDMH.

However, because of the bitterness of the accelerator, these rocks will be destroyed in the future, with the rear cars flying. A naval launch site on Hainan Island, the Wenchang Space Launch Site, has been built for these latter vehicles, while the CZ-4B is the smallest to experiment with using grid fins to maintain the orbits. jump first so they don’t fall over. a man’s place.

The first stage of the CZ-4C uses four YF-21C engines with a total capacity of 665,800 lbf of the tank, and the second stage uses one large YF-22C engine and four YF-23C vernier engines (for directive power), a total of 166,820 lbf for the main engine and 10,600 lbf for the vernier engines.

Chang Zheng 4C left Taiyuan with Daqi-1

The third upgrade used two YF-40A engines with 22,670 lbf of torque. The ability to restart the third stage and fairing is the biggest difference between the CZ-4C and the original CZ-4B that first flew in 1999.

The CZ-4C in flight today launched Daqi-1 into a sun-synchronous polar orbit, which means that the satellite will travel over a given point on the Earth’s surface in the same time of day each day. This provides fixed lighting angles for each view.

The Daqi-1 satellite, dubbed the Atmospheric Environment Monitoring Satellite, was developed by the Shanghai Academy of Spaceflight Technology (SAST) and is the first of a new group of Chinese satellites designed to monitor to air gases and pollution.

This is critical to China’s efforts to combat its notorious air pollution problems and address its carbon emissions, as well as focus on global change.

The Daqi-1 satellite is pre-deployed and launched

The Daqi-1 is equipped with LIDAR around the world (laser imaging, detection, and landing) for the detection of aerosols and carbon dioxide. Daqi-1 can measure nitrogen dioxide, sulfur dioxide, ozone, and fine particle pollution.

The satellite features several sensors capable of LIDAR, high precision and multi-angle image polarimetry, UV hyperspectral atmospheric composition detection, and wide-range spectral imaging. Both dynamic and passive cognitive techniques are used.

Daqi-1 is also equipped to communicate with rear Daqi-series satellites to schedule observations. The lizard’s next satellite, Daqi-2, is designed to lead the observation of high-altitude global warming, and will be followed by other Daqi satellites.

Today’s announcement is the 416th Chang Zheng series launch and the 11th Chinese launch of 2022. This year is important for the Chinese aerospace program in many ways, with Daqi-1 announcing today it is an important event to be able to monitor China’s air pollution.

(Photo guide: Chang Zheng 4C leaves Taiyuan with Daqi-1)

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