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Anonymous users2024-02-07In 1946, Americans experimented with radar to send radio waves to the moon, and for the first time succeeded in receiving its echoes.
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Anonymous users2024-02-06The use of communication satellites: communication satellites ** radio signals, to achieve communication between satellite communication earth stations (including mobile phone terminals) or between earth stations and spacecraft.
Serves as a relay station for radio communications. A communications satellite is like an international messenger, collecting all kinds of "letters" from the ground and then "delivering" them to users in another place. Since it is "stationed" at an altitude of 36,000 kilometers, its "delivery" coverage is particularly large, and one satellite can be responsible for 1 3 communications on the earth's surface.
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Anonymous users2024-02-05China's communication satellites are named (Dongfanghong series).
China's communications satellite series is named after "Dongfanghong", "Dongfanghong No. 1" is China's first early-resistant artificial earth satellite, "Dongfanghong No. 2" series of communication satellites is China's first generation of practical communication satellites, "Dongfanghong No. 3" series of communication satellites is China's first generation of three-axis stable and large-capacity communication satellites, and "Dongfanghong No. 4" series of communication satellites is a world-class communication satellite platform developed by China.
1. "Dongfanghong" series of communication satellites.
Dongfanghong No. 1: China's first artificial satellite, launched on April 24, 1970, marking China's entry into the space age, April 24 is also positioned as "China Space Day".
There are currently 6 in orbit, which are a series of geostationary orbit communication satellites.
The "Zhongxing" series and the "Xinnuo" series are also communication satellites.
2. "Fengyun" series of meteorological satellites.
In 1988, the first meteorological satellite "Fengyun-1" was successfully launched, and a meteorological observation network has been built, including polar-orbiting meteorological satellites and geostationary orbit satellites, making China a country with two meteorological satellites at the same time after the United States and Russia.
3. "Remote Sensing" series of satellites.
Remote sensing satellites refer to artificial satellites that use remote sensing technology and remote sensing equipment to observe land cover and natural phenomena, and are mainly used for land disaster prevention and mitigation, urban planning, etc.
4. "Beidou" navigation satellite.
The world's four major satellite navigation systems, the United States' GPS system, Russia's "GLONASS" system, Europe's "Galileo" system, and China's "Beidou" system.
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Anonymous users2024-02-04In 1957, the first artificial satellite was successfully launched. Engineer: Sergey. Korolev, Soviet.
Satellite communication can be divided into two categories: geostationary satellite communication and mobile satellite communication, according to different categories, its main applications are as follows: >>>More
Hello, this topic is a bit big, lacks a definite limit, and is difficult. I can only give you some references from experience : >>>More
Originating in the United Kingdom, billiards is an elegant indoor sport that is widely popular internationally. Around the 14th century, billiards is said to have been invented for entertainment by the owner of a pawnshop in London called Billsyard, from which the English name of billiards is derived. By the end of the 18th century, billiards as a game was very popular in England. >>>More
Do you know which country developed the early Hongqi engine? Let's find out!
One day in the early 17th century, Hans Lippershey, the owner of an optical shop in a small Dutch town, in order to check the quality of the polished lens, arranged a convex lens and a concave mirror in a line, looked through the lens, and found that the church spire in the distance seemed to be getting bigger and closer, so he accidentally discovered the secret of the telescope. In 1608 he patented a telescope he had made, and in compliance with the authorities' request, he built a binocular. It is said that dozens of opticians in the town claim to have invented the telescope, although it is generally believed that Lieberch was the inventor of the telescope.