Wireless monitoring and wireless technology become necessary tools in the field of public security

With WIFI, WIMAX, 3G and other wireless broadband access technologies, covering the entire city or the main areas of the city, provide broadband wireless access services for individuals, businesses, governments, and even the entire society. As the city continues to expand wirelessly, Samsung Tektronix’s R&D chief forecast predicts that wireless video surveillance services will also be an important part of it, and related cities will set off a climax of wireless surveillance.

Video surveillance is an intuitive, convenient and informative way of recording information, and it can provide monitoring operators with real-time monitoring methods. Video surveillance has become a necessary means for public safety, corporate security, homeland security, and even the community and family security.

Specific application industries and areas include: public safety, transportation, finance, public enterprises, corporate production, commerce, large stadiums, stadiums, customs, defense, border defense, residential communities, and so on.

The current video surveillance system is in the process of transition from analog video surveillance to digital video surveillance. The use of analog video surveillance, or upgraded from analog video surveillance to digital surveillance and wired connection, is the initial stage of the current monitoring system transformation process. The use of digital video surveillance and wireless connectivity will rapidly accelerate the transition of video surveillance.

Wireless monitoring can only achieve local monitoring due to various factors, especially bandwidth constraints. The equipment directly connects to the wireless network and the monitoring area successfully enters the metropolitan area from the local area. Moreover, relative to the fixed-point monitoring, the boosting force for the monitoring of buses, taxis, etc. is very obvious. Previously, wireless surveillance mainly relied on small bandwidth networks such as mobile and China Unicom, which could easily cause delays, bit errors, and so on. “Wireless City” relies on Wi-Fi as a multi-module mesh-grid wireless network system for wireless transmission. Compared with Mobile and China Unicom, network bandwidth has been greatly improved and the stability is also higher. In addition, how to implement monitoring of areas where cabling is difficult or where cabling cannot be performed has always been a major problem in traditional monitoring. After the city has achieved network coverage in the entire city, the aforementioned area is no longer a monitoring blind spot.

However, there are also people in the industry who believe that the impact of broadband on wireless monitoring is very limited. It is believed that although some cities have achieved city-wide coverage of the network, such networks are mainly used for communications and are different from those required for wireless monitoring. Fixed-point monitoring is too expensive and bandwidth is limited. At the same time, it is still in the trial phase and the stability of the network remains to be verified. And whether or not the wireless monitoring system is adopted is largely determined by the complicated geographical environment of the project, the cost of the wiring, and the actual requirements of the implementation project, and is mainly applied in occasions where inconvenient wiring or no obstacles exist, but There are still disadvantages such as instability, unreliability, low bandwidth, and limited coverage of wireless networks. Therefore, to a certain extent, it is still only a supplementary role for cable monitoring, and it is yet to be further improved in technology.

The three stages of wireless video surveillance are based on the recent practice of network video surveillance business operations, the development of wireless network video surveillance technologies and the development of wireless video surveillance needs of different user groups. The author believes that the development of domestic wireless network video surveillance services will be Through the following three stages:

The first stage: the typical application stage of the industry dominated by industry-leading wireless video surveillance applications. Currently, monitoring systems for high-end industrial users, such as domestic safety projects, road monitoring for traffic, and electronic surveillance video surveillance for inspection and quarantine, are mostly large-scale. Metropolitan and even national industrial video surveillance systems. High-end industry users are now mostly in the early stages of building large-scale video surveillance projects. Their requirements for monitoring systems are very high. They not only include the ability of wired-side images to be clearly seen in real time, videos are well saved, and commands such as PTZ control respond quickly. At the same time, it also increased the application requirements for wireless video capture (such as traffic patrols, safe city mobile patrols, urban management mobile patrols and law enforcement, etc.) and mobile video viewing and control.

As operators' profitable video surveillance platforms are basically in the first stage of industry users, government, finance, and telecommunications are still the main application areas for video surveillance. The deep integration of wireless network video surveillance with specific industries will become network video surveillance. The inevitable trend of market development.

The second stage: The innovative application of commercial monitoring and the promotion of the small-scale application of some families The application of small and medium-sized business users is not only another potential large-scale user group of traditional cable network video surveillance services, but also wireless network video surveillance Another important area of ​​application. Such users are small shops, medium-sized chain business organizations, medical institutions, educational institutions, etc. that have distributed monitoring access requirements. Because of the characteristics of mobile users, remote mobile access, and high work efficiency requirements, the penetration rate of wireless network video surveillance services in such applications will have a higher starting point and greater room for improvement.

The business needs of business users for wireless video surveillance, in addition to the basic monitoring business needs such as mobile video viewing, often require the combination of the monitoring system and the business system of the company. For example, medical services may use video surveillance platforms to develop mobile telemedicine services (such as Emergency diagnosis and rescue on ambulances. The bank will use mobile video surveillance for armored vehicles for control, schools will use monitoring platforms for radio teaching, wireless electronic proctoring and other applications.

For business users, a wireless video surveillance platform that integrates well with its own business is a good means to expand the business. Therefore, operators should set up a platform for business customers to seek a guiding strategy. They should look for a wide range of integrators to jointly develop customer-oriented businesses. application. If telecom operators actively guide the development of killer monitoring applications that are suitable for business users, the size of the user base will soon expand.

The third stage: The widespread adoption of a wide range of personal and home applications, commercial and industrial applications, wireless video surveillance and other applications of video, such as IPTV, video conferencing and voice services.

Wireless Monitoring Application Scope 1. Civilian Small-Scale Applications Wireless monitoring systems currently used in civilian applications are mostly used in small areas such as offices and factories, and are mainly based on WLAN and WiFi networks. In these built buildings, if cable monitoring is used, it may cause damage to the original building and it is necessary to dig trenches, bury the line, etc. Therefore, it is not easy to adopt traditional cable monitoring. According to Chen Hongxu of Tiandi Weiye, this method is simple to deploy, requires only a wireless router, and can be transmitted without network overhead. In some areas where the area is small and needs to be monitored, video is transmitted in this manner. It is a better way.

However, this method has a limited range of applications. In a fully accessible open space, the transmission distance can reach 200 meters. However, video transmission can also be implemented in buildings that are relatively close to each other, but relatively speaking, the transmission quality will be affected and needs to be improved.

2. Self-built wireless network application Wireless monitoring is a good solution in forest fire prevention, remote mountainous areas, oil fields, scenic areas, power, water conservancy, environmental protection and other large-scale, long-distance fixed point monitoring applications. In such applications, due to factors such as wide range, remote location, and inconvenient wiring, if traditional cable monitoring methods are used to make the cost of laying and maintaining the line very high, wireless monitoring such as microwave is usually recommended.

The cost of building a wireless network is generally limited by the distance and the number of base stations. There are also costs for one-time and late maintenance. However, the bandwidth is guaranteed, and the image quality is good enough to meet the requirements of remote monitoring.

Therefore, according to industry insiders, the self-built wireless network of the industry should be a public building facility. Investment by the government is reasonable.

3. Operators using carrier networks such as mobile, telecommunications, and China Unicom will provide some wireless transmission networks such as 2.75G and 3G. Can be applied to various types of applications that require wireless monitoring applications, such as bus-borne monitoring, taxi monitoring, subway high-speed rail monitoring and other applications. This kind of application is generally rented from the operator's network. It is characterized by a very wide range of space, as long as the area reached by the operator's network can be used. However, it needs to pay the operator a certain monthly rental fee, and the current price is relatively expensive, and the bandwidth and transmission rate need to be further improved.

Shi Chaozhao, product director of Beijing Transcend Tiancheng Technology Co., Ltd. believes that the application prospect of wireless monitoring is closely related to the development of wireless technologies, especially wireless broadband technologies. With the maturity of wireless high-bandwidth technologies such as WiFi and 3G, more and more Industry will use wireless. Yang Lin, marketing manager of Shenzhen Yellow River Digital Technology Co., Ltd., believes that the adoption of wireless monitoring systems is largely determined by the complex geographical environment, the cost of wiring, and the actual needs of the implementation projects. In the case of convenient wiring or no obstacles, it still has the disadvantages of instability, unreliability, low bandwidth, and limited wireless network coverage. Therefore, to a certain extent, it is still only a supplementary role for cable monitoring, and it is still technically necessary. Further improve.