In his previous life, he had read several articles written by aerospace professionals on the Internet about domestic aerospace failures. Sun Jian knew that domestic aerospace development was not smooth sailing and had experienced many failures and setbacks. In view of the fact that the international situation at that time was not favorable to the country, there were many failures and setbacks. It is forbidden to announce it to the outside world, and the leaders and scientific researchers of the aerospace department can only suffer in silence.
In December 1969, the Long March 1 second-stage rocket malfunctioned and "Dongfanghong 1" failed to enter orbit. This was the first mission of the Long March 1. This incident stimulated Japan and forced it to step up its pace and launch the rocket in advance. Several small satellites weighing several kilograms were sent into the sky.
If this launch is successful, we will become the fourth country in the world to launch satellites, but it is a pity that Japan took the lead.
In January 1984, the Long March 3 third-stage rocket failed and the first geostationary communications satellite, Dongfanghong-2, failed to enter orbit.
On April 8, 1984, the second "Dongfanghong-2" satellite was successfully launched and entered the predetermined orbit to undertake radio and television tasks. However, it only had 4 C-band transponders and could only relay two channels of television programs and undertake 30 There are only 1,000 telephone transmission channels for external broadcasting, and the satellite design life is only 3 years.
On November 30, 1994, the first "Dongfanghong-3" satellite was successfully launched by the Long March-3A rocket. However, during the attitude adjustment process, the satellite's fuel leakage was discovered, and then it was sent into a quasi-synchronous orbit after three orbit changes. On January 6, 1999, technicians confirmed that the satellite's fuel was completely exhausted and could not be delivered to the designated location. The satellite left the measurement and control range of the ground measurement and control station on January 1.
On February 1, 1996, when the Long March 3b high-thrust rocket launched the International 708 communications satellite, two seconds after takeoff, the rocket's flight attitude became abnormal. The rocket bowed its head and tilted to the right away from the launch direction. After 22 seconds of flight, the rocket's head fell to the ground, and the satellite All the arrows were destroyed and the losses were heavy.
After the accident, all commercial launches were canceled.
From conversations with professional satellite professionals such as Huang Decheng, Wang Jingguo, Zhang Junming, Wang Weiji and Li Guotao, Sun Jian also knew the true development status of domestic satellites today.
There is also a national-level professional satellite manufacturing factory in Zhongguancun High-tech Park, the former Beijing Satellite Manufacturing Factory of the Aerospace Group 29th Factory. It was built in 1988 and has more than 900 cadres and employees. It is full of talents. The first artificial earth satellite "Dongfanghong-1" ", the first returnable remote sensing satellite, and the first experimental communication satellite were all born here.
The second "Dongfanghong-3" satellite was successfully launched on March 12, 1997, and was successfully positioned above the equator at longitude 12 east on March 20. The successful development and launch of this satellite made it possible to develop geostationary orbit satellites domestically. A leap from spin-stabilized to three-axis stabilized.
Compared with the "Dongfanghong-2" satellite, the number of C-band transponders of the "Dongfanghong-3" satellite has increased from 4 to 24, and its service life has reached 8 years. Although it has achieved a qualitative leap, it is also accompanied by design challenges. Risks and technical difficulties have increased significantly. During the satellite development, we received technical assistance from MBB of the Federal Republic of Germany, including the development and production of communication antennas and mechanical solar arrays. We also provided a large amount of design support in the development of systems and attitude orbit control subsystems. Support is also given during production and testing activities.
The "Dongfanghong-3" satellite is restricted by the performance and quality of domestic electronic components. It can only transmit 4 channels of color TV signals, and the telephone transmission capacity is only 3,000 channels. It is the same as the mainstream communications in the United States and Russia with 24 multi-band transponders. Compared with satellites, there is still a huge technological gap.
The "Dongfanghong-3" satellite, as the country's first civil satellite for the whole society, has completely reversed the embarrassing situation of China's long-term reliance on leasing foreign satellites to relay domestic TV programs and mobile communications. The medium-capacity communication satellite platform developed by the satellite, referred to as "Dongsan Platform".
The third-generation large geostationary orbit satellite, the "Dongfanghong-4" satellite, has not yet been approved.
Don’t remember when the “Dongfanghong-4” satellite was successfully launched in the previous life? Sun Jian had a hunch that the launch of this satellite was closely related to the trial operation of 3G in the previous life in 2008.
Monday, March 2nd.
"Mom, third mom!"
In the evening, Sun Jian drove Liu Yue and Bi Xiaoyun home. Sun Dong heard the car horn and ran out happily. He opened the door of the villa garage with the remote control and stepped forward to help his mother and third mother carry their bags.
Opening and closing the garage door for his parents every morning and evening has become an important part of Sun Dong's day's work. He also knows that his parents' cars also have garage door remote controls.
Xiang Dongping came out with a big belly and helped Sun Jian take the briefcase.
For the safety of himself and his family, Taobao Holdings Co., Ltd., controlled by Sun Jian alone, spent US$1.2 million to purchase a customized Mercedes-Benz S600 bulletproof car in one step.
The Mercedes-Benz S600 bulletproof car is called the seventh-generation Mercedes-Benz car. It is not something you can buy if you have money. You have to book it six months in advance and tell your true identity.
"Dad, there's been a lot of rain in Jiangcheng this year. Will there be floods this summer?"
Wu Jing and Zhang Yue helped their two mothers-in-law serve food, Sun Shun and Liu Gang put the children in their arms into the cradle, and Liu Yue poured wine for their parents. The family had dinner together, enjoying themselves. No one knew that today was Sun Jian's. The 13th year after rebirth.
In December last year, Wu Jing gave birth to a son, named Sun Liang; Zhang Yue gave birth to a daughter, named Liu Jiayi, with an age difference of 20 days.
Regardless of whether Sun Jian is at home or not, Bi Xiaoyun usually eats breakfast and lunch in the workplace canteen, goes back to Sun's house for dinner, helps clear away the bowls after dinner, and then returns to her big house. She and Sun Jian break through the last barrier. .
Xiang Dongping's due date is on the 1st of next month, and she has booked a VIP room at the Obstetrics and Gynecology Department of Jiangcheng Yikang Hospital.
The great flood of 1998 is getting closer and closer. In the previous life, there was an unprecedented heavy rain in mid-July, which plunged the three towns of Jiangcheng into vast waterlogging. At that time, I lived in a dormitory on the first floor of Jiangcheng Health School. Water entered my home and my furniture was soaked in water. The power outage and water outage were still fresh in Sun Jian's memory. During this period, he had been paying attention to the weather forecast in Jiangcheng and the news from the National Defense Administration.
On April 9, the National Defense Headquarters held its first plenary meeting in 1998. The meeting analyzed the national drought and flood trends in the 1998 flood season and agreed with the water conservancy and meteorological departments' predictions for the two rainy belts in the Yangtze River and the northern region and the possible rainfall of the Yangtze River in 1998. It is judged that a catastrophic flood in 194 will occur.
Last month, the strongest El Niño event of this century occurred, reaching its peak at the end of the year; in winter, the Tibetan Plateau had an unusually large amount of snow.
From late March to late April this year, precipitation in the Yangtze River Basin was significantly higher than normal.
"Jianjian, we also predict that there will be floods this summer. Are you worried that the basement of your home and the underground garage of the community will be flooded?"
Father Sun and Father Liu put down their wine glasses and smiled at each other. They were also worried during this time.
