For a long time, WX communication has played an important role in field exploration, border patrol, earthquake relief and other activities because of its advantages of wide coverage, flexible networking and not limited by geographical environment.However, due to the insufficient number of small terminals, various types of equipment, and the lack of interconnection and interoperability, the rapid mobile communication needs of rescue teams are still not met.Against this background, the WX mobile system came into being. This article will give you a detailed explanation of the origin and development of WX mobile system.First, the WX is going to run.In July 2008, academicians Sun Jiadong and Shen Rongjun jointly wrote a letter **, calling for speeding up the construction of China's own WX m...
发布时间:
2018
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10
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17
浏览次数：70
For a long time, WX communication has played an important role in field exploration, border patrol, earthquake relief and other activities because of its advantages of wide coverage, flexible networking and not limited by geographical environment.However, due to the insufficient number of small terminals, various types of equipment, and the lack of interconnection and interoperability, the rapid mobile communication needs of rescue teams are still not met.Against this background, the WX mobile system came into being. This article will give you a detailed explanation of the origin and developme...
发布时间:
2018
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10
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17
浏览次数：70
Antenna system is composed of transmitting antenna and receiving antenna. The former is a transmission mode converter that converts the radio frequency current or electromagnetic wave of guided wave mode into the space electromagnetic wave of diffuse wave mode, and the latter is a transmission mode converter of inverse transformation.As the transmitting antenna used in the mode conversion of guided traveling wave to diffusion wave, the receiving antenna I used in the mode conversion of diffusion wave to guided traveling wave is called reciprocity theorem, except that the transmitting antenna&#...
发布时间:
2018
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10
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17
浏览次数：24
On April 2, 2018, after accurate calculation and monitoring analysis by the Beijing Space Flight Control Center, Tiangong I re-entered the atmosphere at about 8:15 on the same day, landing in the central South Pacific Ocean, and finally achieved a perfect farewell with its gorgeous posture. On September 29, 2011, at 21:16:03, Jiuquan Satellite Launch Center launched, from this moment on the sky belongs to China's target aircraft and space laboratory. The name "Tiangong" is mainly to cater to the diligent pursuit of unknown space in Chinese traditional mythology. The ancients...
发布时间:
2018
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10
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浏览次数：19
If you look at it a little bit, you can see that the antenna towers are all high around you, or you can just put a signal tower on a local high-rise.I never knew why I had to do this before, but I took it for granted.However, after learning the principle of communication recently, the reason why the antenna tower is relatively high can be understood.Under the understanding of sight distance propagationLine-of-sight propagation (LOS propagation) refers to the propagation of space wave between two points that can be directly reached when ultra-short wave and microwave are used for ground communi...
发布时间:
2018
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10
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17
浏览次数：13