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Introduction of 80GHz band E-Band microwave applications

On December 4, the Ministry of Industry and Information Technology officially issued TD-LTE 4G licences to China Mobile, China Telecom and China Unicom, and China officially entered the era of 4G. According to a report by GSMA Intelligence, a third-party analyst, more than 128 countries will deploy about 500 LTE networks by the end of 2017. 4G not only provides more bandwidth and brings better mobile Internet experience to people, but also challenges the carrier's mobile bearer network.With the issuance of 4G licenses in China, the LTE network will be deployed quickly. However, LTE base station coverage is small, deployment density is much higher than GSM base station and 3G base station, LTE construction will face a large number of new site demand, and part of the new site shortage of fiber resources, the domestic estimated 20% of the new site fiber resources missing, making LTE base station service return and PTN fiber network loop are under pressure. As an important solution of ...

2018 - 10 - 18

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Tiantong No.1 WX mobile system to date the most detailed "spoiler"

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 mobile communication system.After more than three years of demonstration and design, in 2011, China's first WX mobile communication system - Tiantong No. 1 WX mobile communication system project of...

2018 - 10 - 17

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The second generation of E-Band microwave: the choice of LTE Era

With the rapid development of mobile broadband, the network capacity is growing rapidly. As one of the main return modes of bearer network, microwave network is facing the dual challenges of super-large service capacity and densely deployed stations. Traditional band microwave (6-42GHz) spectrum resources are becoming increasingly scarce, bandwidth capacity is limited, it is difficult to meet the G-bit-level large bandwidth stations to return the demand, and E-Band microwave (80GHz) because of its rich bandwidth resources, large transmission capacity, low spectrum usage fees and high-frequency narrow beams to adapt to intensive deployment and other advantages, gradually from the traditional enterprises. The application of the industry market to the carrier class large bandwidth business bearer network development.E-Band can deal with large capacity backhaul easilyE-Band is the microwave frequency band of 80GHz (71-76GHz and 81-86GHz), which is the highest frequency band for commercial ...

2018 - 10 - 17

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Intelligent radar and its key technologies

With the rapid development of artificial intelligence technology and its gradual application in the military field, intelligent radar and intelligent radar technology have attracted wide attention at home and abroad. Strengthening the research of intelligent radar and its key technology is not only the need of radar technology development, but also the key to improve radar combat capability.1. IntroductionTraditional radar works mainly according to the pre-designed working mode. It has no ability to change the working mode automatically with the change of the target and environment, and it has insufficient adaptability to the target and environment. Although adaptive signal processing technology has been widely used to improve radar anti-clutter, anti-jamming and other aspects of performance, but because adaptive signal processing requires the signal to be processed to satisfy the ideal conditions of stationary characteristics in order to obtain satisfactory performance, so the actual ...

2018 - 10 - 17

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Definition, performance parameters, antenna type and feeder system of antenna system

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's power bearing capacity and voltage bearing capacity are far greater than the receiving antenna's, both of them can be exchanged and the basic characteristic parameters of the antenna remain unchanged. Another important function of the antenna is to concentrate the energy of the electromagnetic wave, that is, to concentrate the energy in the transmitting direction while reducing the energy...

2018 - 10 - 17

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Tiangong-1's curtain call

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 regarded "Tiangong" as the most sacred place. The main tasks of Tiangong-1 are: completing the space rendezvous and docking mission with Shenzhou-8; guaranteeing the life and work of astronauts during their short-term residence in orbit, ensuring the safety of astronauts; carrying out space applications (including space environment and space physical exploration), space science exp...

2018 - 10 - 17

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