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How to Speed Up the Landing of China's Smart City

From the pilot of smart city in 2012 to 2019, driven by artificial intelligence, 5g, narrowband Internet of things and other technologies, new application scenarios of smart city continue to land. The construction of smart city in China is changing the "operating system" of the city and bringing convenience to urban governance and people's life.

What is a smart city? Chen Shudong, researcher of the 100 person program of the Institute of microelectronics of the Chinese Academy of Sciences, said in an interview with China news agency that from the perspective of the architecture of the Internet of things, the smart city has significantly strengthened the perception ability of the city; From the perspective of social form changes, from the initial digitization and networking to intelligence and intelligence, smart cities have profoundly changed the forms of social production, consumption and transportation; From the perspective of social civilization, applications such as intelligent transportation and intelligent medical care promote the evolution of social order and make people's life better.

In 2012, China's Ministry of housing and urban rural development issued a document to carry out the National Smart City pilot. Hundreds of cities in China joined the smart city construction. So far, three batches of 227 cities have become pilot cities. Peng Sen, former deputy director of China's national development and Reform Commission, once disclosed data that about 500 cities, including 100% of cities above the sub provincial level, 76% of prefecture level cities and more than 32% of county-level cities, have clearly proposed or are building new smart cities.

Chen Shudong said that through several years of construction, China's smart city construction is upgrading. In terms of network facilities or data center construction, the network mapping between virtual cities and real cities is beginning to take shape; The emergence of mobile Internet, Internet of things, 5g and other information technologies makes smart cities more widespread; Based on data and combining data with artificial intelligence and big data analysis technology, urban intelligent management has made in-depth development in all aspects.

Tang Liu, deputy director of Shenzhen Longhua District Government Service Data Management Bureau, told China news agency that Longhua District has built the first district level Internet of things perception platform in Shenzhen, and has launched about 220000 terminals in ten categories, bringing air, water, fire fighting, street lamps, slopes, hazardous chemical enterprises, pollution source enterprises and eight categories of key vehicles into unified monitoring.

In Hangzhou, with the empowerment of the urban brain, the intelligent signal lights of the intelligent transportation system have covered 1300 intersections and connected to 4500 video routes, saving 50% of the arrival time of emergency vehicles. The system can intelligently identify 110 kinds of alarm situations and actively alarm. More than 30000 alarm situations are found every day, with an accuracy rate of more than 95%.

In Guangdong Province, Tencent is deeply involved in the construction of digital Guangdong. The "Guangdong Provincial affairs" wechat applet developed by Tencent can handle more than 600 government services in one stop. It also links 53 kinds of electronic licenses such as ID card, social security and driver's license, making people more and more convenient. At present, the application has launched a national version.

The maturity of new technologies has accelerated the landing of smart cities. Zhang Chunquan, vice president of Dawning cloud computing group, took security as an example to introduce to the reporter of China news agency that under traditional monitoring conditions, managers need to recognize videos with naked eyes for cases and emergencies. Through artificial intelligence face recognition technology, the pictures captured by cameras can be compared with back-end data, and the data captured by tens of thousands of cameras can be processed at the second level, Such applications have been implemented in some cities.

The large bandwidth, high speed and low delay of 5g network also make some applications that cannot be realized by 4G network become a reality. This year, there have been many remote operations through 5g network. On August 25, the PLA general hospital successfully completed the demonstration of remote orthopedic surgery with the help of China Mobile 5g network.

Smart city is becoming a new investment hotspot. The global semi annual smart city spending guide released by the Internet Data Center (IDC) predicts that in 2023, the global smart city technology related investment will reach US $189.46 billion and the Chinese market will reach US $38.92 billion.

With the deepening of the exploration of smart city, the fundamental purpose of developing smart city is becoming clearer and clearer. Li Tie, President of China Center for urban and small town reform and development, said that to solve the problem of urban governance, first, we should have a more open mind, and second, we should use intelligent technology and intelligent means to serve urban residents, which is the foundation of a smart city.

Source: China News Network

How to Speed Up the Landing of China's Smart City 1

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Problems of Phased Array Ground Penetrating Radar Detection System
Although GPR has been widely used in hydrology, engineering, environment and other fields, many basic theoretical and technical problems have not been fundamentally solved, so the real advantages of GPR have not been brought into full play.The main problems existing in GPR technology include:1) The detection depth is shallow, and the contradiction between detection depth and resolution cannot be overcome. Increasing detection depth means sacrificing detection resolution;2) Multiple spread and other clutter jamming are serious, and there has been no good elimination method, which exists in radars at home and abroad;3) The influence of medium unevenness is great and can not be eliminated, resulting in difficulty in obtaining necessary velocity data;4) The data collection method of single sending and single receiving can provide limited information for post-processing and interpretation.The above problems are fatal defects for GPR. Although many geophysicists, electromagnetic experts and geophysical workers have done a lot of research and improvement on radar antenna design, signal processing and underground target imaging, these works are only partial modifications to the existing GPR system. In order to develop GPR technology, we must update our ideas and solve the problems from the fundamental principle.In view of this situation, experts proposed to develop a new GPR system - phased array GPR detection system in 1999.The basic research idea is to replace the current monopole radar antenna with the phased array radar antenna by using the relatively mature military phased array radar technology. Its purpose is to gather the electromagnetic wave into a narrow beam to transmit underground (or detection object) through the phased array technology, and receive the radar echo signal reflected by the target by using the multi-channel acquisition technology, The advanced data processing is carried out, and finally the three-dimensional image of the internal structure of the detection object is given.Development prospect of ground penetrating radar technologyIt is worth noting that at present, similar products have appeared in the market, such as RIS antenna array series of a company, but these products simply combine multiple monopole antennas into array antennas, which is essentially different from the idea of phased array ground penetrating radar.Because the phased array radar converges the electromagnetic wave into a narrow beam by controlling the phase delay of each channel, the energy is concentrated and the wave front diffusion is small. Therefore, the detection depth of the phased array radar is much larger under the condition of the same frequency and transmission power; On the contrary, under the same detection depth, phased array radar can improve the transmission power, so its resolution is much higher than the existing radar. In addition, since the spherical wave transmission is changed to beam transmission, the influence of medium heterogeneity is much smaller.Secondly, the phased array radar works in a continuous scanning mode and can scan in multiple directions. Therefore, the amount of information is much larger than that of the existing ground penetrating radar. For some special detection work, such as the quality detection of embankment cut-off wall, its role is unmatched by the existing ground penetrating radar (monopole antenna radar can not detect the joints, forks and other defects of embankment cut-off wall at all).Because phased array radar is a multi-channel received signal, multi-channel superposition can be carried out, just like the multiple coverage technology of reflection seismic exploration. Therefore, multiple interference can be greatly eliminated, which is difficult for existing radars. The antenna of high frequency (600mhz-1ghz) phased array ground penetrating radar can be made smaller, and its advantages are unmatched by the existing ground penetrating radar in shallow detection.At present, the system prototype has been completed. The carrier free pulse working system with center frequency of 900MHz is adopted, and the transmitting and receiving antennas are separated. 16 (4 × 4) Transmit channel forming, beam aggregation and scanning 16 (4) × 4) The channel receives the echo, and the optional scanning angles are - 36 °, - 24 °, - 12 °, 0 °, 12 °, 24 ° and 36 °.The software part of the system has rich data processing functions. The main conventional processing includes filtering, gain adjustment, static and dynamic correction, deconvolution, complex signal analysis, time-frequency analysis, etc., and multi-channel data processing, such as velocity analysis, superposition technology, coherence analysis technology, array signal processing, etc. And weak signal extraction, target automatic recognition and inversion interpretation under various clutter interference. A large number of field experiments on concrete detection in Yichang Three Gorges dam are carried out. The experimental results show that the spotlight scanning function of phased array radar has been realized, the penetration depth is greater than 1.5m and the resolution is higher than that of ordinary radar.Editing: hfy
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