Information about Chang 'e II

20 10 on September 29th, a spokesman for China's lunar exploration project announced that Chang 'e-2 satellite and rocket had completed the test and inspection in the launch site, and the test results were normal, which fully met the technical conditions for launching. It will ignite in xichang satellite launch center at 10, 1, 18: 59: 57 and take off at 19: 00 on time. If it can't be launched in the first window time due to weather and other reasons, we also choose to launch it on1October 2nd and 3rd, 65438. At present, Chang 'e II was successfully launched at 10, 10, 1 ignition and 19. After the flight 1534 seconds, the star and arrow separated and the satellite entered orbit.

2065438+00 [1] Around noon on September 28th, as five riders in their 60s from Guiyang Senior Motorcycle Club walked out as the last group of visitors, the gate of xichang satellite launch center was closed until the second day after the launch of Chang 'e II. In the afternoon, I saw outside the gate of xichang satellite launch center that there were almost no people in the spacious forest vagina in the compound. Occasionally, several vehicles with military cards came in and out, and a police car stationed in Yuanze Town Police Station kept patrolling around. Yesterday, the entrance of a village road near the gate of the launch center was guarded by soldiers. During this period, a local fellow tried to drive a van with a pass, but it was found that many people in the van were holding foreign ID cards and were stopped. On the fruit stand outside the launch center, several young people wearing sky-blue overalls were found. The words "No.1 Aerospace Institute" behind them indicate that they are from Beijing and they are the staff of the rocket test team. On their passes, there are not only their recent photos, but also their pass numbers. On the railway line about 5 kilometers away from the launch center, a patrol car with the words "Xichang Works Section of Chengdu Railway Bureau" is being overhauled on the dedicated line. A fellow villager who lives next to the railway said that it is estimated that there will be a "tanker" to transport rocket fuel into the field soon. According to reports, in terms of launch time, relevant work preparations are currently made at 7: 00 pm on June 10. If there are no special circumstances, Chang 'e II will start its trip to the moon at 7 pm on National Day.

Carry an instrument

1.CCD stereo camera 2. X-ray spectrometer Gamma ray spectrometer 4. Laser altimeter 5. Solar high energy particle detector 6. Microwave detector 7. Solar wind ion detector

primary mission

The main task of "Chang 'e II" is to obtain clearer and more detailed image data of the lunar surface and the surface data of the lunar polar region.

The resolution of CCD camera on this satellite will be higher, and other detection equipment will be improved. In order to realize the soft landing of Chang 'e-3, some key technical experiments were carried out, and the landing area of Chang 'e-3 was imaged with high precision.

run time

Sun Huixian, deputy chief designer of the lunar exploration project, told the media: "Actually, Chang 'e II is the backup star of Chang 'e I." Sun Huixian revealed that when launching Chang 'e I, two satellites were prepared to ensure the success of the flight around the moon. "If Chang 'e-1 can't achieve its original goal, it may launch this spare star. The Chang' e-1 mission has been successfully completed, and this satellite has become the leading star of the second phase of China's lunar exploration project. " Sun Huixian revealed that as the leading star of Chang 'e III, the mission of Chang 'e II will last for half a year. [3]

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Further explore the distribution of elements on the surface of the moon, the thickness of lunar soil and the space environment of the earth and the moon.

Ten tasks

(Test Task) 1. Cooperate with the launch vehicle to verify the direct launch technology of the earth-moon transfer orbit; The second is to verify the lunar orbit capture technology of braking in recent months at a distance of 100 km from the lunar surface; Third, verify 100 km× 15 km orbital maneuver and flight technology; 4. Carry out high-resolution imaging test on the alternate area of the second phase project; 5. Test the X-band TT&C technology by using the light miniaturized X-band deep space transponder and the newly-built X-band ground TT&C station in China; 6. Test the low-density parity-check code (LDPC) coding technology of telemetry channel, high-speed data transmission technology between the moon and the earth and landing camera technology; (exploration mission) 7. Obtain a more accurate three-dimensional image of the lunar surface, and the resolution is improved from 120m of Chang 'e-1 satellite to better than10m; 8. Detecting the material composition of the moon; 9. Detecting lunar soil characteristics; X. Exploring the space environment of the Earth, the Moon and recent months.

Eight technologies

The upcoming Chang 'e II will open up a new "direct flight route" between the Earth and the Moon, that is, it will be launched directly to the Chang 'e II satellite.

Moving the orbit will shorten the flight time of Chang 'e II to less than five days. As the whole country pays attention to the launch of Chang 'e-2 satellite, Academician Ouyang Ziyuan, senior consultant of China's lunar exploration project and chief scientist of Chang 'e-1 satellite exploration project, was invited to publish an article in the latest issue of Spacecraft Engineering, revealing that Chang 'e-2 has eight technical improvements. "Connecting the past with the future, sustainable development" is a summary of Academician Ouyang's mission of carrying Chang 'e II. He said that Chang 'e II, as the pilot star of the second lunar exploration project, is mainly responsible for testing and verifying some key technologies and new equipment related to the soft landing of the lunar surface, testing a new lunar orbit and reducing the technical risks of the second lunar exploration project; Its first scientific task is to make a detailed survey of the lunar landing zone and draw a topographic map of the landing zone carefully. Generally speaking, Chang 'e-2 performs the task of "fine exploration" of the moon, which will lay a scientific and technological foundation for the safe landing of Chang 'e-3 on the surface of the moon in the future, and its performance will lay a scientific and technological foundation for the successful implementation of the second phase of lunar exploration. Compared with Chang 'e I, Chang 'e II has improved in many aspects. Academician Ouyang summarized it into eight aspects: First, the orbit design of Chang 'e II is different from that of Chang 'e I, and the launched Chang 'e II will open up a new "direct route" between the earth and the moon, that is, it will be directly launched into the earth-moon transfer orbit, which will greatly shorten the flight time of Chang 'e II; Secondly, Chang 'e-2 satellite will orbit the moon in a polar orbit about 100 km from the surface of the moon, which is lower than Chang 'e-1' s orbit about 200 km from the surface of the moon, which is conducive to fine mapping of key areas; Thirdly, the way of Chang 'e II flying directly to the moon puts forward higher requirements for the orbital accuracy and speed of the launch vehicle to carry out the mission of Chang 'e II.

Compared with the Long March 3A rocket that escorted Chang 'e-1 to the sky, the Long March 3C rocket has two boosters. Fourthly, in order to obtain the fine terrain data of the landing zone, the distance between the "laser footprints" left by the Chang 'e-2 laser altimeter on the surface of the moon is smaller, and the laser ranging accuracy can reach 5 meters, thus obtaining high-density elevation measurement data of several key areas of the moon; Fifth, the spatial resolution of the CCD stereo camera carried by Chang 'e II will be increased from about 120m in Chang 'e I period to below 10m, and other detection equipment will be improved, and the detected data about the moon will be more detailed. Sixth, the main scientific goal of Chang 'e-2 is to carry out fine mapping and stereo imaging of key areas such as the lunar landing zone, and to detect the composition and distribution of elements on the lunar surface, the electromagnetic characteristics of lunar soil, the latitude and thickness of grain size, and the space environment in recent months. These higher spatial resolution detection data obtained by Chang 'e II can be checked with the detection data of Chang 'e I; Seventh, Chang 'e II will drill an elliptical orbit of 15km× 100km before the soft landing of Chang 'e III, which is the first time that a lunar exploration satellite is so close to the surface of the moon. Eighth, according to the requirements of the second lunar exploration project, X-band TT&C has been added, which will expand China's deep space TT&C communication capability to the distance between the Earth and Mars. [4]

Edit the development process of this paragraph.

165438+1October 6, CCTV news reported at 30: 00 that China's self-developed Chang 'e-2 satellite has entered the prototype development stage and will be fixed on the launch tower at 20 10.

Launched in 2008. The second phase of Chang 'e project has also been formally established, and it is planned to launch China's lunar lander and lunar rover around 20 12. Chang 'e-2, like Chang 'e-1 satellite, mainly flies around the moon, so the satellite weighs about 2 tons. Because the contents and purposes of the two satellites are different, the developers have adjusted the payload used in scientific exploration experiments. According to the "three-step" strategy of China's lunar exploration project, after the launch of Chang 'e-2 satellite, a lunar lander and a lunar rover will be launched to explore the surface of the moon. Look at this one-to-one lunar lander model, which is a model of the lunar rover, and can simulate the whole process of the lunar lander releasing the lunar rover. Experts told reporters that the lunar lander can analyze the lunar soil on the surface of the moon, and the lunar rover can patrol and detect within 5 kilometers of the lander diameter. It mainly breaks through the lunar soft landing technology, lunar patrol technology and unmanned autonomous navigation technology. China's lunar exploration project will be completed in three phases, and it is necessary to break through the three key technologies of "winding", "falling" and "returning". [1] Exhibition map of China's lunar exploration project

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Edit the relevant data of this paragraph.

-Chang 'e-2 satellite weighs 2480 kilograms; -The Long March III C carrier rocket that launched Chang 'e II has a total length of 54.84 meters, a takeoff mass of 345 tons and a carrying capacity of 3.8 tons. The launch of Chang 'e II will be 13 1 flight of Long March rockets; -The rocket sent Chang 'e II into a direct orbit around the moon with an apogee of nearly 380,000 kilometers, while the apogee of Chang 'e I was only about 5 100 kilometers; -Because of the different orbital design, Chang 'e II can reach the moon in about 5 days, greatly shortening the time of Chang 'e I 14 days; —— Orbital height of the satellite orbiting the moon100km, which is closer to the moon than Chang 'e-1100km; -The newly developed camera on the satellite can improve the resolution of images taken on the moon from 120m on Chang 'e-1 to about10m; The design life of Chang 'e II is half a year, and that of Chang 'e I is one year, with an actual life of 494 days, including 482 days around the moon. -Rocket systems and satellite systems have more than 80,000 components, and more than 200 kinds of initiating explosive devices are ignited in the air.

Edit the schedule of this paragraph "Running to the Moon"

20 10, 10, 10,1:today 1 1 officially entered the discharge process, which is an irreversible procedure. At the same time, the last meteorological "conference" was held to make an executable meteorological report. 13: 30: Meteorological report on liquid hydrogen filling of rocket is released. If the rocket can be launched as scheduled, cryogenic liquid hydrogen will be injected 5.5 hours before the rocket launch (i.e. 10, 13: 30). In order to ensure the power of the rocket, the refueling work should be maintained until the last two minutes before launch. Chang 'e II is in the launch tower.

17: 17 enters the pre-launch system and really enters the pre-launch system. At this point, the ground began to power up the system, at the same time, all kinds of passwords began to communicate and send out at this time. This section indicates that the rocket has entered the most tense stage. 18: 20: The countdown to tower platform deployment is 40 minutes (18: 20), and the No.2 tower slewing platform is deployed step by step from top to bottom. 18: 45: countdown to evacuation begins 15 (18: 45), and the last batch of service personnel leave the No.2 launch tower and evacuate to the cave shelter near the tower. 18: 58: 27 seconds: the battery power in the system counts down for 90 seconds (18: 58: 27 seconds), and the power is turned on. That is, from the ground power supply in the system to the battery power supply, unplug the cable plug connected to the system. 18: 58: 57 seconds: prepare for ignition and launch for 60 seconds (18: 58: 57 seconds). 18: 59 and 17 seconds: the commander reports a countdown of 40 seconds (18: 59 and 17 seconds). 18: 59: 47 seconds: ignition countdown 10 seconds (18: 59: 47 seconds), and the instruction length is 0 1 to start the countdown. 18: 59: 57 seconds: ignition countdown is 0 seconds (18: 59: 57 seconds). 19: 00 sharp: Three seconds after Chang 'e took off (19: 00 sharp), the rocket lifted Chang 'e II and exploded. 19: 25: 53: separation of star and arrow (after the rocket was launched 1553 seconds). The rocket and satellite were successfully separated 19: 57: 36: The command center announced the successful launch of Chang 'e II.

Edit this flight preparation.

On September 9, 2065438+00, the State Bureau of Science, Technology and Industry for National Defense revealed that the second phase of China's lunar exploration project "Chang 'e II" mission was progressing smoothly, and the preparations for the five major systems, such as Chang 'e II satellite and Long March III C carrier rocket, were basically ready, and pre-launch test preparations were being carried out. The test flight mission is planned to be implemented before the end of this year.

Comprehensive exercise

20 10 On September 25th, the "Chang 'e II" lunar exploration satellite completed the third synthesis exercise before launch, which means that Chang 'e II launched the Long March III C rocket with the Chang 'e II satellite.

Enter the countdown 1 01October1,Chang 'e II is expected to start a trip to the moon. Yesterday, the reporter was allowed to enter xichang satellite launch center and got in touch with Chang 'e II "Zero Distance". At present, relevant experts are making final preparations for the launch. Xichang satellite launch center is about 60 kilometers away from Xichang. The reporter drove for nearly an hour, passed through many checkpoints and reached the launch platform, the core venue of the launch. "Yesterday afternoon, the launch base had already conducted the third synthetic exercise before the Chang 'e II lunar exploration. All the pre-launch inspections and debugging have been completed, and now we are waiting to refuel the rocket. "A staff member at the scene told the reporter that Chang 'e II has entered the countdown, and it is expected to be launched this week if the weather permits. The Chang 'e-2 satellite rocket, which has been tested three times, has been transferred to the No.2 fixed platform and entered the standby state. Once the launch is decided, the Chang 'e-2 satellite rocket will be quickly transferred from the platform to the tower for ignition and launch. "The staff said that in order to let more people enjoy the perfect launch of Chang 'e II on the spot, the relevant departments set up an on-site observation point 3 kilometers away from the launch platform," which can accommodate more than 1000 people. " According to reports, the flight procedure of "Chang 'e II" is similar to that of "Chang 'e I". The key is that its working orbit is 200 kilometers. This time, it is planned to reduce it to 100 km, so that the moon can be seen more clearly, and its flight time to the moon will be shorter than that of Chang 'e-1, and it is estimated that it will reach the lunar orbit in less than 5 days.

Filled fuel