Satellites and Background Background and Satellites 1. Regarding the service life of satellites, I saw a question raised by a friend who doesn¡¯t like Sui Feng. In fact, I have posted relevant information in the discussion area before and also answered it. Unfortunately, I can¡¯t find it. I just posted it again. Let me give you an explanation as background information. The novel once explained that some satellites did not appear on the satellite list of Duan Tianxing (No. 6 Research Institute). It is speculated that they were launched in the late war or during the period of permanent freezing. Of course, we cannot explain too much here, so as not to affect the future. plot development. However, this can also explain why the satellite used by the Returner Alliance is in open mode and can be used as long as there is equipment. A brief explanation of the age definition in the work: 2000-2100 is before the outbreak of the Doomsday War and is also the most glorious period of human civilization. Around 2100, the war broke out. There are no detailed historical records, and there are different opinions, but they all admit that the Doomsday War occurred only briefly. Around 2100-2180, during the permafrost period 2180-2204, the climate gradually returned to normal, especially around 2190-2200, the temperature rise and recovery accelerated. 2204: The year when the work takes place. The satellites in the work are roughly divided into two categories, military satellites and civilian satellites. In my conception, no military satellites are launched after the war, but some civilian satellites are set to be launched after the war. The specific reasons will be explained later in the article. However, no matter what kind of satellite it is, the current satellite life has been extended from 3 to 5 days in the period when the satellite was first born in 190-1970 to the current longest of 10-12 years. Then, the satellite life in a hundred years will be extended. how much? At least it won't be shorter than it is now, right? As for how long a "scrapped" (to be more precise) satellite will stay in the universe, South Korea happened to scrap one in January this year. I found the article and put it at the end of the information, readers can refer to it. This is only China's satellite data. There are also foreign satellites with longer service life. If you are interested, you can check it out. The point I want to make is: given the same technical conditions or satellite functions, how many years will most countries choose to replace them? Or should it be replaced every few decades? Or between two satellites with the same function, would you choose the one that has a long service life and is durable? Or is it one that has been used for a short time and is easily damaged? This is almost a question that needs no elaboration. Unless the function cannot be continued and has to be replaced, who would change satellites every day? Regarding the issue of satellite communication frequency bands, first of all, the satellite system used by Wang Ping and others is not for military use. I didn¡¯t say so in the article? I just said that Paradise City has attack satellites, and their image observation satellites are weather satellites. Maybe I didn't emphasize it enough? Secondly, to give a simple example in terms of satellite communications, everyone is watching cable TV now, right? Have you ever watched satellite TV? In fact, these TV signals are spread using relevant satellites. To put it simply, a TV station in a provincial capital city can now spread its TV programs through satellites to at least any house in East Asia that has a satellite TV receiver. There are also TV stations abroad through this This method is used to carry out some kind of propaganda that is not in line with China's national conditions. This is actually a simple mode of two-way communication. And if you just walk into a small satellite receiver store, such as the one on Baling Street in Harbin, and they say you want to buy a decoder, you can decode it by just saying the name of the satellite, and it was available more than ten years ago. So, please don¡¯t think that satellite communication is so complicated. It is already like this now, but what about a hundred years from now? 3. Comprehensive list of China's military satellites 1. Photoreconnaissance satellites 'Fenghuo' type 12 satellites from 1999 to 2002, service life 9 'Fenghuo' type 9 satellites from 1991999, service life 4 'Fenghuo' type 9 satellites from 1992 to 1999, service life 3 Fire'1a type, 15 pieces, 1987-1993, service life: Fire'0a type, 30 pieces, 1974-1987, service life 35 days. 2. The global positioning satellite 'Beidou' type 3a has 12 satellites from 2001 to 2002, the service life is 2000, the service life is 2000, the service life is 2000, the service life is 1999, the service life is 3 Year. 3. The four marine surveillance satellites ¡®Haiyang¡¯ 1a were built in 2002 and have a service life of 5 years. 4. The communication satellite 'Dongfanghong' has 4 type 5a satellites from 2000 to 2002, the service life is 1 Hong'4a type satellite from 1997 to 2000, the service life is 1 Hong'3a type satellite from 1994 to 1997, and the service life is 12 Hong'2b type satellites from 1988 to 1991. , service life years. ¡®Dongfanghong¡¯ type 2a has 9 pieces from 1984 to 198, and the service life of Fanghong¡¯ type 1a has 3 pieces from 1970 to 1980, with a service life of 2 years. 5. One meteorological satellite, Fengyun 4a, was launched in 2002, and two Yun 3a satellites were launched in 2000-2001, with a service life of 20 years. ¡®Fengyun¡¯ type 2a satellites were launched in 1997-2000, service life was one of type ¡®Yunyun¡¯ 1a satellites in 1988, 1990, service life of ¡®Fengyun¡¯ type 7a satellites was achieved in 2002, and service life of ¡®Fengyun¡¯ type 5 satellites was implemented in 2000-2001. ¡®Practice¡¯ type 5a produced 4 pieces in 1999, and the service life of ¡®type 4a¡¯ reached 3 pieces in 1994, with a service life of 10 years. ¡®Practice¡¯ Type 3a 4 pieces in 1993, with a service life of 10 years. 'Jianjian' 2a type satellite was built in 1989 and 1993, with a service life of 9. Jian'1a type 1 satellite was built in 1988 with a service life of 0 days. Fourth, the Korea Aerospace Research Institute issued a statement on January 13, 2008, saying that due to the "Arirang 1" satellite and Contact with the ground was lost, and the South Korean government has decided to end the mission of South Korea's first multi-functional artificial satellite. According to South Korea's Yonhap News Agency, the satellite is currently orbiting 672 kilometers above the ground with an inclination of 98 degrees. The satellite is now running on backup fuel and can only last a month. Mission endedAfter that, the satellite will slowly descend after the reserve fuel is used up. After about 46 years, it will enter the atmosphere and burn to ashes due to friction with the air. "Arirang 1" is South Korea's first multi-functional artificial satellite. Its main mission is to take images of the earth. The satellite was launched in December 1999. Its designed service life was three years, which has been extended to eight years so far, and it has taken a total of about 470,000 photos. (Xinhua News Agency) 5. On October 27, the 100MW solar cell production demonstration line, an important site in Hunan Solar Photovoltaic Industrial Park, is expected to be put into operation within the year. The photovoltaic industry, also known as solar power generation, uses solar cells to directly convert sunlight energy into electrical energy. According to calculations, the energy that the sun shines on the earth every second is equivalent to 5 million tons of coal. The energy projected onto the earth's surface in 40 minutes is equivalent to the total energy consumed in the world every year. Each solar cell only takes three to five years to recover its cost, and its service life can reach 50 years! ~!