Wireless technology and network video surveillance

In today's security network of the tide, wireless technology undoubtedly plays a role in fuelling. As far as the video surveillance industry is concerned, 3G, WiFi, WiMAX three-bit as the main leading video to monitor the wireless move forward, satellite, microwave system two vanguard also in the field of emergency command and other areas, coupled with the emergence of the new generation of 4G, resulting in video surveillance wireless transmission has become a brand-new era.

Security Network tide of hands

When the TV channel to "CCTV5" to watch "The NBA Christmas War" with the remote control, out of the phone to pick up on the winter greetings or with pad and the long-awaited Friends of the video chat, there is a mysterious messenger wireless technology is attentive to the data sent in the air.

For wireless technology, Tianjin World Albert Digital Technology Co., Ltd. hard record department product manager Zhang Zu just gave an explanation: "Wireless networks, which include both global voice and data networks that allow users to establish remote wireless connections, as well as infrared and RF technologies optimized for short-range wireless connections, are very similar to those used in wired networks, The biggest difference is the different transmission media, the use of wireless technology to replace the wired network cable, you can and cable networks for each other backup. ”

In recent years, the application of wireless technology just like the spring grass, radio, television, mobile phone, network and other daily application of the form and potential of further excavation, which brings a new concept to people's lives, but also increasingly in all walks of life to expand and extend. And with it, communications ambiguous security industry, nature is also the wireless technology layout of a major focus.

As early as in the early 80, wireless technology has begun to be used in the security industry. And since 1997 Wireless Lan (IEEE802.11) standard, wireless network by its no wiring, flexibility, and so the advantages of many security operators are sought after, the corresponding wireless security products are emerging. Now, in the tide of security network, wireless technology seems to play the role of the impetus regardless of the development of the beginning early, the limelight is full of wireless monitoring, wireless alarm, or unwilling to fall wind, dynamic wireless intercom, wireless access control, or performance eye-catching smart home wireless applications.

With the cable competition

In fact, wireless technology in the security industry is not "groundless". Although in terms of video surveillance, whether it was the analog dynasty or the current network era, wired transmission has dominated the entire market (so far, its status is still not to be shaken), but the cable is not so perfect. "There is no doubt that Wired is a very useful way to deploy a regional video surveillance network," said the technical staff of the company, a friend of electronic equipment, Shanghai. Even with long-distance video transmissions, fiber optics can be solved. But for the scattered, remote areas of the single point mode, fast moving objects, the need for temporary deployment of video monitoring, cable transmission can only be beyond reach. In this case, using a wireless network for video transmission is the only option. ”

From the Friends of the electronic also learned that, in addition to the high mobility, the scope is not limited by environmental conditions, compared with the cable monitoring, wireless monitoring program has the following three major advantages:

· Set up flexible, easy to network, especially suitable for outdoor or more remote distance applications, such as: oil fields, mines, docks, construction sites;

· Easy to manage, easy to maintain, save maintenance cost;

· Low overall cost and high execution efficiency. Do not have to pull the pipe buried, do not destroy the original settings, the expansion of extremely convenient.

The future development of monitoring network will require video surveillance industry transmission mode more flexibility, adaptability, can be quickly deployed, flexible network, so wireless will be an integral part of monitoring.

Wireless Surveillance lineup Luxury

At present, the wireless technology used in the field of video surveillance is like satellite, microwave system, wireless mobile network, broadband wireless and so on. Under the influence of the microwave signal frequency band and the transmitting power, various kinds of digital wireless network transmission technology have great difference in the speed and coverage range. For cost reasons, currently in the field of video surveillance mainly using WiFi (Wireless LAN), WiMax (Wireless metropolitan area Network) and 3G (Wireless WAN). "Hai Kang Wei View (002415, share bar) Product Manager Zhou Xin expression.

This column more highlights: http://www.bianceng.cn/Network/wxwl/

In its view, with the gradual commercialization of 3G, especially TD-SCDMA in the domestic scale, brought about by the relatively ideal bandwidth and network coverage, there will be more video surveillance projects using 3G technology. Two other highly-watched wireless technologies are WiFi and WiMAX, with wireless cities growing in size and superior performance in some video surveillance cases, and WiMAX wireless video surveillance technology will be in prospect.

3G, WiFi, WiMAX LED

Of course, although WiFi, WiMAX and 3G in the field of surveillance to ensure data transmission stability of the banner, but in the original design, they used different technical means to solve different application problems.

1, 3G occupy wireless monitoring heights

It is said that the advent of the 3G era marks the arrival of wireless transmission into a new era. And the same in the security industry, 3G wireless monitoring products are also used by the industry media "monitoring milestones in the field of products" to be nominal.

"3G networks can support at least 2Mbps, 384kbps, and 144kbps transmission speeds in the indoor, outdoor and driving environments, with a qualitative improvement over current commercial mobile broadband network CDMA (153.6kbps) and GPRS (115.2kbps) bandwidth, Can better meet the network video monitoring bandwidth requirements, provide a clearer and smoother video transmission effect. "Shenzhen San Shan Technology Co., Ltd. Wireless Mobile Manager Songhuatong said," The previous wireless network monitoring due to bandwidth constraints, the scope of its application has been limited, and 3G commercial and popular can better solve the problem of bandwidth. ”

Since the beginning of 2009, with the promotion of communication operators, 3G monitoring has been continuously heating up, small-scale applications have sprung up. And from the previous year, 3G concept has been completed warm-up exercises, the small test gradually into the scale of application. In addition to the industry users of video surveillance services to add new features, expand new features, but also for the public to provide home monitoring services, including the 3G platform based monitoring value-added application system. And with the "Global Eye" and China Netcom "wide vision" and other operational level video surveillance business development, operators have also begun to consider the network video surveillance and 3G integration as the next important business growth. From the technical, business and cost level, 3G applications will have a profound impact on video surveillance and even the entire security industry.

2, WiFi on the "Wireless City" express

In fact, the application of WiFi in the security field is very extensive, but also the wireless monitoring application of the most wireless technology, but limited by the transmission distance (the signal radius is only about 100 meters), has been bent in a small range of indoor monitoring to touch beating crawl.

Into the 2011, by the global sweep of the "Wireless city," the construction of the East Wind, wifi in the security industry's value is reassessed. Different from the former local government's Ituge, at this time mobile, unicom, telecommunications have begun to take the initiative in the city's airports, universities, transport hubs and other key areas of the layout of the "Hot spot", and combined with their own user resources began to vigorously promote. It can be seen that the three major operators behind the 3G War, the secret of WiFi rivalry is becoming more and more obvious.

"The main driver of the current operator's power to push WiFi is the pressure from the data business." The development of wireless internet has brought about the explosion of data business, such as video service, which consumes a lot of bandwidth. "A person in the IT sector said.

To this, heaven and earth Albert Zhang Zugang made a more in-depth explanation: "Although some people still sing down WiFi, but whether it is 3G or td-lte, or the future 4G, from the capacity, cost and so on are absolutely not likely to support the large-scale application of wireless internet." With a lot of users, the network is blocked. and WiFi access due to the speed and low cost, will become the most suitable means of streaming data flow. "As a result, wireless cities are the vanguard of the construction of non-wifi.

3, WiMAX or comeback

WiMAX, which was presented by WiMAX Forum and formed in June 2001, is the interface standard for IEEE 802.16 Ethernet networks, as is the standard for WiFi as a 802.11 ethernet network, and it was initially positioned as a new way of wireless transmission to replace the latter. As a result, WiMAX was launched, that is, by many wireless industry, has become the hottest word in recent years.

Objectively speaking, WiMAX in the global business development performance. In the United States, the European Union, Japan and other countries and regions, WiMAX advocates play in full swing, but in China but eat to the embarrassment of WiMAX has not yet received the Ministry of the floor license.

In fact, WiMAX had landed in China as early as 2007 and had a real fire. First March, China Unicom (600050, shares) held WiMAX broadband wireless access test Project accreditation acceptance; Subsequently, the Ministry of Communications and Science and Technology Committee said that in preparation for the Beijing Olympics, by the second quarter of 2008, Beijing will set up 150 WiMAX base stations, covering 90% of Beijing The main Street; in the same year, China Netcom is also actively testing WiMAX, Guangdong, Jiangsu, Zhejiang, Shanghai and other land Netcom company has launched a WiMAX pilot work, of which the Guangdong Netcom WiMAX wireless Broadband Access project total of more than 600 sets, known as the Asia-Pacific region's largest WiMAX project. WiMAX commercial Test in the year in China's one or two-line city is very heat. However, entering the 2008, with the three major Chinese operators 3G business gradually launched, WCDMA, CDMA2000 and TD-SCDMA increasingly hot; In a noisy communications market, WiMAX is rarely mentioned.

WiMAX in China there is really no chance? WiMAX, a dim prospect, has seen a glimmer of hope in China's wireless city boom. "Currently widely used WiFi can only solve indoor coverage, and fixed WiMAX (802.16D) can not achieve mobile high-speed Internet access, so that wireless city anytime and anywhere to access high-speed Internet vision greatly discounted." and mobile WiMAX (802.16E) can realize the mobile high-speed broadband access. "San Shan technology Songhuatong said. For now, Wifi+wimax is the best solution for a wireless city. It added: "The first generation of wireless cities has solved the need for a small number of people to surf the internet in smaller areas, but later operators and users have clearly expressed a stronger demand and need to improve the network further." On the Wifi+wimax scheme, WiFi is used for indoor coverage and hot spots in the vicinity of the building, with a wide range of outdoor coverage being achieved with more advantageous WiMAX, covering a range of up to more than 10 km, allowing a terminal to move from indoor to outdoor without hindrance. and WiFi and WiMAX switching problem has been resolved. ”

In addition to the combination with WiFi combined boxing, WiMAX is also exploring and td-lte of the marriage conspiracy. With the help of Td-lte in China, WiMAX may be able to hit the mainstream market. San Shan Technology Songhuatong said: "Weak weak union, eliminates the TDD standard between the internal friction, in the next 4G development, perhaps not only the TD opportunity, also is the WiMAX opportunity." ”

In the monitoring industry, there are some high-end residential areas in the wireless monitoring has been applied to WiMAX technology. On the future development, WiMAX is also suitable for the establishment of remote network, such as oil, petrochemical and railway systems, with which to achieve the pipeline, road sections along the monitoring and communication.

Group II: satellite, Microwave

In addition to 3G, WiFi, WiMAX three-bit, in the wireless monitoring field, but also active in such as satellite, microwave systems, such as wireless transmission vanguard. Although it can not be compared with the former in terms of technology cost performance and application breadth, satellite and microwave systems can not be belittled in some specific fields.

1. Satellite assisted emergency System

In the wireless transmission technology, the satellite communication technology develops maturely, the superiority is also very obvious. With a wide range of services, powerful, flexible use, not subject to geographical environment and other external environmental impact, and other advantages, but in the monitoring market small gains.

It is understood that there are currently two types of satellite transmission video signal mode, that is, "static" (satellite vehicles in the fixed point for real-time transmission) and "moving in the" (satellite vehicles in the mobile process can be the corresponding monitoring). In recent years, the development of the situation, "moving through the" is more favored by the professional field, especially in the public security departments are popular. At present, provincial Public security department and some of the municipal Public Security Bureau of better economic conditions, generally equipped with the satellite "mobile" system of emergency command vehicles and individual equipment, to provide broadband communications services. In addition, it is also widely used in traffic accident exploration vehicles, fire Armed Police Field command vehicles and customs, oil fields, mines, water conservancy, electricity, finance, maritime, and other emergency, emergency command system. The main role is the real-time image transmission back to the command center, so that the command center decision-making personnel, such as immersive, improve the accuracy and timeliness of decision-making, improve efficiency.

Of course, in the field of wireless monitoring, satellite monitoring system has never been focused on, nor security wireless monitoring manufacturers focus on development. and satellite monitoring applications stalled, the culprit is that its high operating costs of the monthly cost of up to thousands of yuan, in addition, the existence of cover blind spot also let it discount: in mountainous areas, tunnels, urban buildings more dense and relatively high object occlusion dead ends, its transmission signal will be affected, and may even be interrupted.