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Video Surveillance System through the development of a matrix represented by the
analog control system, across a representative of the hard disk recorder for the
digital control system, the current network of video servers is represented by
the third generation of network video surveillance system as the main theme of
development and be the vast number of users and the project's trust. Once the
video surveillance technology into the Internet era, it has been applied into
the development of high-speed road, at the same time in the wired network and
wireless network to keep pace. Although the application of wired network is
still occupying the absolute advantage, but in the foreseeable future, the
wireless network of its significant convenience and superior environment for the
development of Video Surveillance System for up a beautiful blueprint.
First, the wireless monitoring and control system development process
Wireless Video Surveillance System through the development of signal
transmission of analog and digital signal transmission of two times. In the
video surveillance system is still in the era of analog monitor, there have been
the first generation of wireless monitoring system. At that moment, the
monitoring system to send the microwave analog video signals. However, this
technology has been gradually fading out of the market.
With the
development of video compression technology, network video technology to achieve
the digitization of analog video processing, will be a continuous analog signal
through the AD after the acquisition by a dedicated chip digital signal
processor to deal with, and in accordance with the format of IP packet data
package to network signal sent. This wireless network transmission equipment was
introduced to video surveillance systems. For wireless devices, it can be
transparent to the video signal transmission network, and wireless network video
transmission technology. In this regard on behalf of spread spectrum wireless
microwave technology, the major manufacturers on behalf of Motorola. This
transmission can be achieved convergence 54M bandwidth, transmission distance
can reach several tens of kilometers, in the forest monitoring, field monitoring
applications, such as the scene of some special applications.
With
the mainstream in recent years, driven by IT vendors and third-generation
wireless communication technologies mature, including the SCDMA technology and
WIMAX technology. These technologies will be video surveillance system into the
broader fields of application. City to achieve the signal coverage for a city to
provide wireless solutions for wireless monitoring technology has paved the way
of civilian.
Second, the type of wireless monitoring system
Spread Spectrum wireless microwave
5.8GHz is the radio
in July 2002 has just been approved by the Management Committee of the band
carriers, 5.8G frequency band to support the work of 5.725 ~ 5.850GHz in the
IEEE 802.11a standard, 6,9,12,18,24,36,48 and support 54Mbit / s dynamic rate
adjustment, in the booster mode, the availability of up to 108Mbit / s
bandwidth. As a result of 5.8Gbit / s equipment-band open, low-cost and has been
widely praised. 5.8GHzCanopy wireless access system operators can take full
advantage of the existing frequency resources in the construction of 5.8GHz
wireless access networks, operators can be extensive use of advanced and mature
technology 5.8GHz microwave transmission can be rapid, low-cost way to achieve
major cities in the region of wireless coverage for voice, data, images,
Internet access and other high-quality range of services, specific applications
include IP telephony, video surveillance, Internet line, telemedicine, remote
learning, and other value-added services business, and become the main means of
wireless access.
At present this technology in the field of wireless
video surveillance continues to play an important role is to solve the wireless
transmission of the main program. It can be brought together to provide up to
54M of bandwidth, suitable for conducting video surveillance business. For
enterprises, industry users with a professional solution. However, the
disadvantage of such a program on the environment require a higher antenna, not
the middle of building block, the direction-sensitive antenna. Albert world
forest monitoring system in Henan province were to apply this method on.
Motorola Inc., through the formation of the directional antenna wireless
networks, network monitoring front-end video servers, the analog signal is
converted to digital signals, transmitted through the wireless bridge.
GPRS
GPRS --- General Packet Radio Service, General Packet Radio
Service, is a system based on the GSM wireless packet switching technologies to
provide end-to-end, wide-area wireless IP connection. GPRS is a high-speed data
processing technology, method is based on "clusters" in the form of transmitting
information to the user's hands. The use of "clusters" of technology, Internet
users can be disconnected from the suffering. In addition the use of a wide
range of GPRS, including through mobile phones to send and receive e-mail,
browsing the Internet. The use of GPRS, the data packet to send and receive the
achievement, which means that users are always online at the same time and by
the flow of billing, to quickly lower the costs of the services.
GPRS
wireless video surveillance operations for the main contribution is to provide a
convenient mode of access, the user as long as there is cell phone signal in
places where you can access the network through the GPRS module. But its
drawback is that a smaller bandwidth, can only be applied to the low frame rate,
low-quality video transmission, mainly for individual users. Albert in the world
for individual users, you can monitor GPRS-based information to remind the
police function. For example, in monitoring the front-end testing of the alarm
signal can be the situation in the form of pictures sent to customers and
clients through the text to inform the police at the scene conditions.
TD-SCDMA
Chinese TD-SCDMA Time Division Synchronous Code Division
Multiple Access implications for access, the communication technology is a
wireless communications technical standards, it is the first time by the Chinese
in this radio transmission technology (RTT) and based on international
cooperation, the completion of the TD-SCDMA standard, CDMA TDD standard has
become one. TD-SCDMA wireless network through the wireless network controller
(RNC) connected to the switching network, as three generations of mobile
communications in the circuit and packet switching, as defined in the business.
Presented by TD-SCDMA advanced mobile wireless system is the wireless
environment for all symmetric and asymmetric design of the 3G business, and it
can not run on the spectrum of the RF. TD-SCDMA transmission direction of the
time-domain adaptive resource allocation can be made independent of the symmetry
relations between the operational load of the best utilization of spectrum
allocation.
This is the main push by China's third-generation communication
technologies, is still in the testing phase. However, the application of TD
Technology in China has an unshakable determination, expected in the domestic
market the technology will be a great space for development.
WIMAX
WiMax (World Interoperability for Microwave Access) means that global
interoperability for Microwave Access, is based on the IEEE802.16 standard for
wireless metropolitan area network technology. Its signal transmission radius of
50 kilometers to the suburbs has basically been able to cover. It can provide
more high-speed broadband access. WiMax can provide the maximum access speed is
70M, the speed of 3G can provide 30 times the speed of broadband. At the same
time it can provide an excellent last-mile Internet access services. As a
wireless metropolitan area network technology, which can be connected to the
Internet WIFI hot spots, can also be used as wired access such as DSL wireless
expansion, to achieve last-mile broadband access.
WIMAX technology is
already in some cities to carry out experimental work, carrying the mobile video
surveillance business. After the Olympic Games is expected to be the technology
sector in the civilian efforts to promote greater access. Albert world are also
active in wireless network environment optimized video server technology, making
the network video terminal equipment is more suitable for the characteristics of
3G networks. Albert is currently the world has been in the video image
processing, network packet transmission, cache and network capacity is
dynamically adjusted, such as adaptive gain significant results. WIMAX access
equipment is technically complex, and some used equipment is a three-tier,
network video server in the use of the time, in order to allow users to quickly
access network, network video server Albert world "address memory" function,
active wear through the network at the same time, record the path traversed so
that the client back to visit, equipment leads are automatically on the network
to adapt to the current.
Third, the application of wireless
monitoring system characteristics
Wireless monitoring system has
significant advantages, but also in the application of unique technical
features, in actual use to pay special attention to.
Environmental
Impact
Most of the wireless monitoring system affected by the
weather, wind, rain, Ray, electricity will affect the wireless transmission
system. Directional antenna to the direction of more stringent requirements for
wireless base stations, transmission systems, such as CDMA, WIMAX and other
wireless technologies in the base station requires the use of signal range. At
the same time, the role of buildings and reflected the role of shielding will
reduce the signal strength, the general has to receive signal strength indicator
device, like cell phone signal strength, like the instructions, you can prompt
the current environment, the receiving device to obtain the signal strength.
Bandwidth stability
For these reasons, the wireless
network system provides the bandwidth may also be stable enough. Project to a
friend in the formation of a wireless network video surveillance system should
also pay attention to when the monitoring bandwidth. The general system
requirements for video surveillance networks to achieve the appropriate
resolution, the resolution different for different bandwidth needs, please refer
to the following table:
CIF HALF D1 D1 resolution
Bandwidth of 512kbps
1024kbps 2048kbps
If video equipment is set to a resolution bandwidth
must be met after the corresponding value, otherwise there will be dropped
frames, drop in video quality and so on. You can use the "BANDWITH" such as
testing software for bandwidth between the two tests to see whether there is
bandwidth trough, is stable. Albert world network of video surveillance
equipment in addition to the realization of the dynamic adaptation of bandwidth,
but also monitor the network for wireless packet transmission to do a special
optimized. Wireless network based on the situation of large packet or packet
dynamic portfolio strategies, and optimize the transmission efficiency and make
full use of network traffic, to achieve a smooth transfer.
network
penetration
Large number of wireless access products, and some are
data link layer, and some belong to the network layer, and some need to
configure the dynamic IP, and some need to configure port mapping. These are for
network video surveillance technology has brought a lot of inconvenience. How
fast is applied to wireless networks, in particular, how quickly the use of
three-tier network access equipment, as a project to a friend eager to solve.
Albert world network for video surveillance products, particularly the
characteristics of wireless network technology to provide a network penetration
technology. Network video server access to a wireless device will be able to
automatically obtain the three-tier distribution equipment IP address,
destination address to launch its own initiative to connect. Users can access
and transparent monitoring of the entire wireless network.
data
security
Wireless video surveillance network has been completely
different from the traditional closed-circuit monitoring of the CCTV system,
which is an open monitoring system, any legitimate terminal can access to the
system, this is also an important manifestation of its advantages. But at the
same time important for video surveillance, how to resolve the issue of data
security, particularly important. At present in the wireless network technology,
has begun the extensive use of encryption technology, password and address
binding, only a legitimate MAC address in order to register into the system and
check the legitimacy of the receiving system. Albert world network video
products to be completed in the application layer data encryption, to provide
video files including encrypted digital watermarking technology, visit the
client IP address filtering technology to further enhance the security of the
system.
Fourth, the advantages of wireless monitoring system
Video Surveillance System has been the development of applications based on the
convenience and technology-oriented nature. Wireless Video Surveillance System,
whether the application of technology and environment for the development of
both the charm and unique advantages in video surveillance is bound to occupy a
certain proportion of the field is expected in the next few years will be
relatively rapid pace of development.
The need for application
A complete set of video surveillance systems, including monitoring the
inevitable front-end and transmission control center is in three parts. Wireless
monitoring system is removed from the biggest advantages of trouble wiring to
achieve a faster front-to-back access. Monitoring forest like the mountains,
along the highway monitoring, field no-man's land monitoring, border
surveillance shoreline difficult to conventional wiring, the cost is too high,
this situation can only use the wireless monitoring system. In recent years, our
country safe in a number of urban construction, urban systems, only the part of
special industries, such as Internet cafes, entertainment control, but to
realize the city's control, the city covered the cost of line access is still
high. Shenzhen City in this regard, we made a try, the Nanshan District, the
city realized the wireless network coverage, wireless network video
surveillance, in the technical and financial inputs to find a balance. Including
Guangzhou, including some cities also have plans to implement wireless network
coverage, which are video surveillance systems for the realization of the
foundation. Can be seen, wireless network monitoring application has a unique
advantage. Environment for the development of the superiority of
Vigorous development of China's independent intellectual property rights of
the TD-SCDMA technology, as well as Datang Telecom manufacturers represented by
the relevant tests have been completed. Although the operator has not yet been
issued a license MII countries, the Chinese master's determination to push this
technology has been unshakable, the operators are very positive about this piece
of the market, and video services as a value-added services to the main front.
According to the Hong Kong media is expected, TD Technology will become the
mainstream of the mainland 3G technology. Build a wireless network for wireless
video surveillance technology to provide a good development platform.
In
addition, such as telecommunications and network operators to carry "Global Eye"
and "Wide World" into the monitor market, but also the promotion of the
traditional monitoring of the development and expansion of the market, the city
of peace-building has been an important force contribution. And Unicom is
expected to move on behalf of the wireless business for the operators will also
be added to the video surveillance market, a strong promotion of wireless video
surveillance business.
Fifth, the development of wireless monitoring
system the direction of
Wireless video surveillance system, although
a long way to go, when its development road map is clearly visible. In
technology integration, and application of civilian as well as the development
of mainstream technology is a wireless monitoring system can truly achieve the
key:
of technology integration
Network video
surveillance technology has been taking the path of a technology integration.
Network from the original video server, to launch the network then one ball,
until very popular today, network camera, network video technology Yuntai with
ball technology, the integration of camera technology. When the wireless
technology involved in the growing field of video surveillance, network video
technology and wireless technology has become a logical thing, which also help
to further improve product stability and ease of application and is conducive to
sub-vendor network video market, the competition to avoid homogenization.
Currently on the market to support WIFI network camera is the best evidence of
this point of view. The next wireless network supports a variety of types of
network video products that will flourish in the market.
civilian
applications of
Video monitoring system is experienced by the
industry to the civilian application of such a course of change. And the
emergence of wireless applications, end the process of adding fuel to the flames
even more. With the further development of 3G technology, everyone holding a
cell phone will become a best business platform for wireless terminals. People
can achieve through the mobile phone wireless network monitoring. At the same
time, the family is also the emergence of wireless networks, people can access
the notebook with the wireless network router, rapid formation of HWLAN (home
wireless network). Model to support the wireless network camera family will take
care of family, shop inspections, such as functions, makes wireless monitoring
technology further into the home users.
of mainstream
technology-led
Wireless monitoring system is bound to the size of the
application can not be separated from the wireless network environment, and a
wireless network environment can not be separated from the building operator. As
China's 3G network technology improving, the Beijing Olympic Games on the
"Hi-tech Olympics" concept to promote the role of information technology to TD,
represented the third generation wireless network technology is bound to rise
rapidly in China. This is a wireless network monitoring system, the key to the
size of the application.
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