In order to extend the life of the "Qiaoqiao", the operation of "Rabbit II" worked in place for 2 months

Star, the moon group, whether the family reunites to enjoy the autumn moon, or the lone shadow is the Yue Si Township, whether you look up at the night sky, will you think of the Yutu No. 2 on the back of the moon? What is it doing?

This question comes from the driver on the ground to answer: "Jade Rabbit is sleeping at this time. Every time the full moon is the stage of the Yutu No. 2 dormant, because at this time it is the monthly night of the moon. It causes damage to the scientific load carried by the car and carry it. "The Yutu No. 2 resting in place has actually not moved for 2 months.

The monthly back is the human communication restricted area. Before 2019, no human spacecraft had been involved in it. Until the Yutu II lunar car took the first step to land on the back of the month, opened the wonderful journey of exploring the moon back ...

The one who broke the communication barrier and the only channel was set up was the "Qiaoqiao" relay star.

"Qiaoqiao" relay star track schematic diagram

The "Qiaoqiao" relay star was deployed at the Lun Moon L2 after the launch on May 21, 2018, and escorted the Yueyu 2nd Tu Bao of Yutu II. The queue of service. While ensuring the safety of the Yue Rabbit No. 2 monthly inspection, the driver also tried his best to study how to extend the life of the "Qiaoqiao" and provide reliable communication guarantee for the Yue Rabbit's monthly back work. Among them, the "Achilles" of all deep -space spacecraft -the use of propellars has become the top priority for drivers to study.

The HALO track where the "Qiaoqiao" relay is located is an unstable track. Here long -term flight will gradually spread. Therefore, in order to maintain the track configuration, it needs to be maintained regularly. Essence Although there are few advanced propulsion agents for each track maintenance, it has accumulated over time, but it has caused the consumption that cannot be underestimated. And with the extension of the service time, the performance of several thrustrs has decreased to varying degrees, coupled with the reduction of high pressure gas pressure and the limitation of sensor accuracy. In this case Sexual difficulties.

The pushing agent of deep space spacecraft cannot be added, so how to achieve scientific throbbing in existing situations has become an important issue for drivers to study.

The drivers of the Beijing Aerospace Flight Control Center found that the relay star will be uninstalled after the motor is saturated, resulting in non -expected disturbance of the existing orbit. In most cases, it will exacerbate the divergence of the track, but it is extremely individual time. Instead, it can slow down the divergence of the track.

If you can adjust the attitude before uninstalling the jet to the direction that is conducive to the convergence of the orbit, then you can reduce the control increase required when the dimbolarian rail maintenance is unloaded, greatly extend the maintenance cycle of maintenance, and reduce the consumption of the advancement agent to the original to the original to the original to the original to the original to the original One percent. The drivers have implemented this strategy in the early stage and have achieved considerable benefits.

Recently, after further analysis of the four -year data data, the drivers have found factors such as light pressure and other factors. The cumulative speed of the momentum of the "Qiaoqiao" has a certain law. The attitude of the "Qiaoqiao" may even use the kinetic wheel jet to uninstall it to maintain the track configuration, achieve long -term trackless control operation, and greatly reduce the consumption of the pushing agent. Therefore, from the day of the 44th day, the driver decided to keep Yutu No. 2 remained motionless and verify the accumulation of momentum in the lower corner of the different attitudes of the "Qiaoqiao".

Driven from the driver of the "Qiaoqiao" extended life

After nearly 2 months of testing, the drivers finally mastered the relevant laws and designed a set of "lugga bridge" corner -volume management model that can take into account the Yue Rabbit Moon Day. Principles and expected returns. The "Qiaoqiao" has been greatly continued in the orbit life, and Yutu No. 2 can start again to explore more unknown areas.

The shattered stone piles in the southwest became the first stop after the restart of the Yutu adventure. With the closer to the crushed rock pits, the potholes and gravel along the way gradually increased. On the morning of the 4th and 6th June, the phenomenon of over -exposure appeared in the northwest of Yutu II. Out of safety reasons, the drivers carefully controlled the tackling lines of Yutu, bypassing the potholes of the stars and potholes. Essence

The driver got the news on the day and afternoon of the day, and a long -space measurement and control station will carry out long -term retreat to maintain, resulting in a reduction in the use of the use and control arc segment when wakeup next month, which means that the dormant gesture of the day Yutu II this month The desire to control is only 2 degrees, which brings great challenges to the drivers. Everyone carefully selected the dormant location, repeated calculation planning to the running route to the gravel pile, and boldly designed the dormant road of nearly 10 meters in the afternoon of the moon day. When the rolling angle was displayed at -0.2 degrees, the driver's superb "car skills" was verified again, and the posture of Yutu 2 was perfectly in the expected design range.

Subsequently, the driver controlled the Jade Rabbit No. 2 to make colorful imaging on the gravel pile of 10 meters away, and finally glanced at the closive view of the gravel pile.In the strong sun, many gravels are flashing with colorful light, scattered on a towering platform like diamonds, and there seems to be a deep giant pit on the opposite side of the platform.Attract the drivers, look forward to the exploration of it next month, and also look forward to more unknown monthly backs ... Author | Han Shaojin, Li Ke, Song Xingguang

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