Li Maodeng: "Teaching" Hui Tianwen No. 1 Lottery Mars 丨 Struggler is Youth

On May 15, 2021, when the lander was asked to land in Mars on the same day, Li Maoden's eyes were moist.

Li Maodeng, who is currently the senior engineer of the Beijing Institute of Control Engineering, has served as the deputy director designer who entered the cabin system, the number of navigation and control sub -systems, and was responsible for the navigation plan and the navigation plan and landing process of Tianwen No. 1. algorithm. To put it simply, he has to "teach" the preset program to "Teach" the No. 1 to calculate his position, speed, and posture of his relative to Mars, so as to achieve autonomous control of entering the cabin.

Tianwen No. 1, who wrapped in the landing inspector, entered the cabin to enter the atmosphere of Mars 125 kilometers from the surface of Mars, about 4.8 kilometers per second. About 9 minutes later, the speed of Tianwen No. 1 lander will be reduced to 0, and the surface of Mars is smoothly landed on the surface of Mars with a preset posture. However, because there is a one -way 17 -minute communication delay between the earth and Mars, the ground cannot be controlled remotely in real time, so all this can only be done by the lander. These 9 minutes are often called "terror 9 minutes".

Drawing: Yangmei Interactive

Li Maoden is most worried about the umbrella drop. The powerful resistance generated after the parachute is opened will make the left -handed left shot. If the swing is too severe, it may "turn dizzy" the lander to make it lose the direction. This is undoubtedly a huge test of entering the cabin, and it is also the actual test of Li Maoden's work.

In order to ensure success, Li Maodeng and his colleagues made a lot of preparations on the earth. They set up accurate simulation models as much as possible, simulated the possible situations, and carried out millions of simulation "targets", and carried out development, and developed. Corresponding test verification work. In order to adapt to the challenges brought by the big dynamics and strong uncertain flight environment, Li Maodeng designed high -tolerance and independent independent information integration independent navigation solutions and algorithms, which can achieve accurate estimation of key navigation status, and then guide to enter the cabin to make it to make the cabin to make to make the cabin to make it Decisions correctly, independently landing Mars.

However, the simulation on the earth is different from the Mars environment. When the landor really started landing in Mars, Li Maodin's heart seemed to jump out of his chest, which may be the longest 9 minutes he had experienced. Entering Mars atmosphere, umbrella control, power deceleration, suspension imaging ... These links that have simulated countless times on the earth are still nervous when landing. Finally, when Mars that successfully landed on the earth returned to the earth from 300 million kilometers away, Li Maoden's heart returned to his original position. In the past 7 years, his bitterness has disappeared at this moment, and he has made a sedative appearance.

Li Maoden sometimes feels wronged. If the aerospace mission only looks at the results, only success and failure. Once it fails, no matter how many hardships will be, no one knows. But aerospace also hits him. He has always been suffering from losses before, and now he has become open -minded. When the pressure is difficult to resolve, he will play the piano and read a book to pursue the calmness of his heart. After all, compared with this vast universe, his anxiety is as small and insignificant as the sea. He loves the career of aerospace. He believes that as long as he pays 100%efforts, he does not regret his life, and it is also a success in a sense.

Source: Science and Technology Daily

- END -