The first half of the Chinese and French hybrid satellites took off, and 7 small satellites got on the ride.

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 The first half of the Chinese and French hybrid satellites took off, and 7 small satellites got on the ride.


The first satellite jointly developed by China and France, China-France Ocean Satellite, was launched from China Jiuquan Satellite Launch Center at 0843 on October 29.

The reporter learned from the National Defense Bureau of Science and Technology that after the satellite was officially put into use, the satellite will continue to work in orbit 520 kilometers above the ground, realizing large-scale and high-precision synchronous observation of ocean surface wind and waves worldwide, and the observation data will be shared between China and France.

The satellite has been developed for ten years. China is responsible for providing satellite platform, ocean wind observation load and launching measurement and control. France is responsible for providing ocean wave observation load. It is not only a milestone in the cooperation between the two countries in the field of high-tech, but also a concrete manifestation of their continued cooperation on the issue of joint response to climate change. It will promote the development of Ocean Satellite Engineering and the upgrading of satellite application services between the two countries.

Ten years pregnant, the Sino French team worked closely together

In October 2006, under the witness of the leaders of China and France, the directors of the two space agencies signed the Memorandum of Understanding between the National Space Administration of China and the National Space Research Center of France on the joint development of space technology applications in climate change research and space exploration.

As the first cooperation project between China and the worlds advanced space agencies at the satellite system level, China-France ocean satellites have attracted great attention. In January 2018, during his visit to China, French President Mark Long visited the five academies of China Aerospace Science and Technology Group to inspect the satellites under test and the satellite development team.

In the project demonstration, scheme design, stand-alone development, integrated satellite testing, launch control and other links, the five academies team has always been customer demand as the traction, and the French research and development team to maintain close cooperation. In view of the fact that there are many links and parties involved in satellite development, the five academies have jointly carried out satellite assembly, integration, testing and phase evaluation. The two sides have implemented synergies at the scene to jointly ensure the successful implementation of the satellite project and the full realization of its scientific objectives.

In the follow-up data processing and application process, the two sides will continue to cooperate on the principle of equality, mutual benefit and sharing.

New loads give satellites more new skills.

China-France ocean satellite is based on CAST2000 satellite platform in China. It is developed by the Fifth Academy of Aerospace Dongfanghong Satellite Co., Ltd. It will be used to obtain ocean dynamic environment parameters such as wind field and wave wave information.

According to Wang Lili, the satellite commander-in-chief and designer, two new types of microwave remote sensing payloads were innovatively integrated on the satellite platform, giving the satellite more new skills.

Among them, the microwave scatterometer developed jointly by Xian Branch of the Fifth Academy of Sciences and its brothers is the first sector cone scanning scatterometer in the world.

Microwave scatterometer has the characteristics of large-scale, all-day-time, global observation. It can cover the global sea area in one day. Such detection capability will make the satellite play a unique role in monitoring the marine environment such as typhoons on the sea surface.

For example, when a typhoon is still in a tropical depression state, the microwave scatterometer can capture its morphological characteristics on the ocean surface, and transmit the observed data to the users in real time, providing decision-making basis for the relevant departments to analyze, interpret and forecast. By accurately capturing the center of a typhoon and tracking its position changes, we can get the track and moving speed of the typhoon. These data are helpful to judge the intensity and destructiveness of the typhoon directly and effectively.

The satellites data transmission subsystem is jointly developed by China and France. It is responsible for receiving and coding data from remote sensing payloads, and then storing or directly transmitting the data back to the ground receiving station.

Whether it is stored or transmitted, the data transmission subsystem can independently and intelligently choose. It is worth mentioning that the solid-state memory on the satellite is partitioned and can be used separately by China and France without interference.

7 small satellites catch a ride.

The Long March two carrier rocket, which carried out the mission, has been fully developed by the aerospace science and technology group. In addition to putting China-France ocean satellites into orbit, the rocket also used its remaining capacity to carry seven small satellites in the form of a windward ride. It also set a record of the number of small satellites carried by the rocket.

According to Xu Qin, Deputy designer of the Chang Er C rocket, the rocket used to carry only 1 to 2 small satellites in addition to the main satellite mission. In order to adapt to the launch mission of one rocket and many satellites, the research team has reformed the structure of the rocket and set up a ring-shaped installation platform for satellites to facilitate the installation of small satellites. At the same time, the carrier controller is added, the purpose is to receive the actual separation signal of the main satellite, send it to the rest of the passengers according to the timing, and the small satellites complete the separation action by themselves. After the launch of the Sino-French ocean satellite, a series of Orbit-changing actions will be carried out. In addition, the number of small satellites carried in this time is large. The separation direction, speed and sequence of each small satellite may affect the mission security. For this reason, the research team carried out a series of analysis work, such as separation of near field, separation of far field, mechanical characteristics, to ensure the safety and reliability of the whole mission. (Science and Technology Daily, Beijing, October 29) Source of this article: Science and Technology Daily - Responsible Editor of China Science and Technology Network: Qiao Junjing_NBJ11279

According to Xu Qin, Deputy designer of the Chang Er C rocket, the rocket used to carry only 1 to 2 small satellites in addition to the main satellite mission. In order to adapt to the launch mission of one rocket and many satellites, the research team has reformed the structure of the rocket and set up a ring-shaped installation platform for satellites to facilitate the installation of small satellites. At the same time, the carrier controller is added, the purpose is to receive the actual separation signal of the main satellite, send it to the rest of the passengers according to the timing, and the small satellites complete the separation action by themselves.

After the launch of the Sino-French ocean satellite, a series of Orbit-changing actions will be carried out. In addition, the number of small satellites carried in this time is large. The separation direction, speed and sequence of each small satellite may affect the mission security. For this reason, the research team carried out a series of analysis work, such as separation of near field, separation of far field, mechanical characteristics, to ensure the safety and reliability of the whole mission. (Science and technology daily, Beijing, October 29)