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The Development of Intelligent Security Is Accelerating, and the Scale of Video Surveillance Market

Intelligent security is a three-dimensional defense system composed of various security detectors in the security system, such as smoke detection, mobile detection, glass breakage detection, door magnetic access control, visual intercom and video monitoring, which intelligently applies and processes the video, picture, sound, signal and other information obtained in the security system, Use intelligent technology to automatically analyze and identify the information, and finally achieve the purpose of pre judgment and early warning, safety and protection in advance.

In recent years, the total output value of global security equipment accounts for about 25% of the whole security industry. Among them, video security accounts for 54%, access control system accounts for 22.5%, and anti-theft alarm system accounts for 23.5%. It is estimated that by 2017, the security market is expected to reach US $170 billion. According to the data released by IHS, a market research organization, in the global security market, the growth rate in the field of entrance and exit control reached 8%, the growth rate in the field of anti-theft alarm was 5.1%, the growth rate in the field of explosion-proof security inspection was 5.7%, and the growth rate of other physical security products reached 7%. At present, the fastest growth rate is video monitoring equipment, with an average annual growth rate of 12.4%. It is estimated that by 2018, the video surveillance market will reach US $26 billion.

The United States and the United Kingdom have the highest camera coverage in the world. The data show that the United States is equipped with about 96 surveillance cameras per 1000 people, and the United Kingdom is equipped with about 75 surveillance cameras per 1000 people. In cities with high camera density in China, the number of cameras per 1000 people is less than 40. In addition, at present, the global penetration rate of civil security equipment is about 10%, the penetration rate of civil security equipment in the United States has reached 50%, while China's civil security equipment accounts for about 11% of the overall security market, which has great room for improvement in the future.

Data show that last year, the total output value of China's security equipment industry reached 486 billion yuan, and the growth rate of the security industry remained at about 13%. In China's security equipment market, the market share of video surveillance products has reached more than 50%, becoming the core product of building security equipment system. The annual compound growth rate of video surveillance products has exceeded 12%.

From the perspective of industrial chain, China's security equipment industry is composed of upstream parts suppliers, midstream software and hardware suppliers, downstream dealers, integrators, general contractors and top-level designers. Among them, the upstream suppliers are mainly electronic components and semiconductor chip suppliers; The midstream is mainly equipment manufacturing; Downstream are designers and general contractors, mainly composed of telecom operators or system integrators.

With the rapid development of Internet of things, artificial intelligence, cloud computing, big data and other technologies, intelligence will become the mainstream configuration of security products. In the future, security applications will be extended to government, public utilities, education, community and financial industry, with broad development space.

The Development of Intelligent Security Is Accelerating, and the Scale of Video Surveillance Market  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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