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How does the No. 4 fall? Demystifying the “four girls” of the moon “artifact”

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Zhongxin.com, Xi'an, January 3rdfrom

Title: Demystifying the “four girls” of the moon “artifact”

Zhongxin.com reporter Tian Jin

The No. 4 detector landed softly on the back of the moon on the 3rd. The China Aerospace Science and Technology Group's Fifth Institute Xi'an Branch developed a range-measuring speed sensor (also known as a lunar radar) developed by the No. 4 detector, a digital transmission device, and a relay communication subsystem developed for the No. 4 relay star “鹊 Bridge”. Such equipment is a must-have “artifact” for the “Four Girls”.

How does the No. 4 fall? Demystifying the "four girls" of the moon "artifact" -How-does-the-No.-4-fall-Demystifying-the-four-girls-of-the-moon-artifact

The developers of the No. 4 detector of Xi'an Branch are discussing the issue. Su Hongwei

The terrain on the back of the moon is very different from the front of the moon. According to the photo of the back of the moon sent back by the space probe, there are many mountains and low-lying areas on the back of the moon, ups and downs. The “Four Girls” will fall to the Antarctic basin in the south of the moon, which is very different from the “three girls” falling on the relatively flat terrain of the moon. It also adds a great deal to the “four girls” Difficulties.

During the lunar flight phase, the ground will inject the information and parameters related to the moon into the No. 4 detector, telling the “four girls” how to fall, when to fall, and where to fall. In the process of the moon, the “four girls” work on the back of the moon, and the researchers on the ground can only communicate with the “four girls” through the “鹊 Bridge”. The relay communication subsystem developed by Xi'an Branch for the “Bengqiao” can realize the dialogue between the ground and the “Four Girls”.

How does the No. 4 fall? Demystifying the "four girls" of the moon "artifact" -1546528777_9_How-does-the-No.-4-fall-Demystifying-the-four-girls-of-the-moon-artifact

The developers of the No. 4 detector of Xi'an Branch are discussing the issue. Su Hongwei

Even so, the transmission of information through the high-altitude data transfer station of the 4th relay star will inevitably cause a time difference and delay the signal transmission. The entire moon landing process is short and fast, and the “Four Girls” need to navigate the moon with the help of the distance measuring speed sensor. The distance measuring speed sensor developed by Xi'an Branch for the No. 4 is able to make the “Four Girls” light and fall by grasping the information of speed and distance. The distance measuring speed sensor is similar to the driving radar and reversing radar of the car in daily life, which will greatly facilitate the “four girls” to control the posture and smooth “parking”. It can be said that the distance measuring speed sensor is the fourth detector. The bright eyes of the Lunar New Moon Road. In order to develop this upgraded and optimized version of the distance measuring speed sensor, the designers of Xi'an Branch have carried out arduous research. Among them, the crane test and the school flight test have been done several times to simulate the performance of the test distance measuring speed sensor to meet the demand.

Liu Ruidong, head of the development of the No. 4 distance measuring speed sensor in Xi'an Branch, recalled: “The school flight test was completed in the summer. The test team members have experienced the 'ice and fire' with a temperature of more than 40 degrees on the ground and a low temperature of 0 degrees on the aircraft. The test.”

Before the No. 4 detector, Xi'an Branch invested a large amount of scientific research strength, for the flight testers No. 1, No. 2, No. 3, No. 5 and No. 4 relay satellites that have been successfully launched and tested. Yanqiao offers a large number of key system products.

How does the No. 4 fall? Demystifying the "four girls" of the moon "artifact" -1546528777_904_How-does-the-No.-4-fall-Demystifying-the-four-girls-of-the-moon-artifact

The leaders of the Xi'an Branch awarded the flag to the test team of the No. 4 Detector. Su Hongwei

Li Jun, dean of Xi'an Branch, said that in the mission of the lunar exploration project, Xi'an Branch has undertaken key system products and played a key role in realizing the realization of the first two steps of the lunar exploration project. The digital transmission system equipment developed has been returned. China's first lunar surface image, the first Hongwan lunar surface image, the first landing lunar moon, the jade rabbit lunar walk, and the picture of the two sides and the jade rabbit “two shots”, the first human being is 75 million The image of the Tutatis asteroid in the kilometer; the developed X-band measurement and control transponder successfully verified the Chinese deep space measurement and control system, and the omnidirectional antenna and beacon antenna for the control and communication of the satellite and the ground and the orbital work The important role of the Rangometer is to make a significant contribution to the Lunar III hovering and lunar soft landing.

In the No. 4 mission, Xi'an Branch developed a measurement and control subsystem, an antenna subsystem, and a relay communication subsystem for the No. 4 relay satellite launched in May last year, enabling the “Bridge Bridge” to maintain all-weather communication with the Earth. Illuminated “The road to the back of the moon on the 4th.” (Finish)


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