Construction of the "safe city", the building of a harmonious society
"Safe city" project is a large-scale, integrated very strong management system, his broad face involved, not only need to meet the security management, urban management, transportation management, emergency and other needs, but also to take account of disaster warning and safety production monitoring, and so on image monitoring needs.
It is not just an ordinary monitoring system, but also the alarm, access control, and other supporting systems integration and linkage with the broadcasting system.
A complete digital video surveillance system, essentially monitoring region information acquisition, transfer, Exchange, analysis, storage and retrieval process.
Up from its physical topology is to say, a complete video surveillance system including the front-end equipment, transmission parts, central control equipment and storage devices, etc.
Safe city monitoring system construction technology means there are two main categories, one category is used in conjunction with analog method, that is used is the matrix online and DVR control and recording, by a wide variety of transmission media, in particular through the fiber access.
Monitoring system of important video is transferred to the center of the matrix. This matrix may actually be multi-level matrix, you can display, you can make the keyboard control, you can do an analysis of multimedia. Another category of pure digital, analog cameras through the codec access network solutions, leveraging the existing network resource, use digital compression and transmission technologies, remote image transmission, broadcasting and storage.
The current network of urban monitoring system is a major barrier to device compatibility is significantly different from that which is "safe city" monitoring system networking Renault, it is difficult to achieve the desired monitoring results, the above results are due mainly to the security system integration is not an open system platform, various subsystems manufacturer in order to cope with their own products and the development of system integration platform, this platform, you cannot count on genuine open platform, and system integration of significance is that the independent subsystem between deep data sharing, I personally think that the monitoring system open system platform should be a able to compatible devices from different manufacturers, different device Protocol, different technologies, different devices can be integrated into the platform up and running, system expansion and extended functionality to powerful system of information management, highly consistent.
To cite but one example of Guangzhou AEBELL company in safe city road surveillance project, NDMP monitoring management platform, in the peaceful town of practical engineering applications of behaves more advantages, this software is a good solution to a system of compatibility problems.
For the "safe city" monitoring network for the implementation of the urban information interconnection, or all levels of the network information recursively upload is vital, this is the traditional security monitoring network new problems encountered.
In fact, even the same city, there are different monitoring network integration, network transmission is an unavoidable problem. Currently used in the network, with fibre and wirelessly.
For cable and fibre composition of the network, from inside the subnet, with reliable and safety advantages, but whether networking or maintenance costs are too high, moreover also can only be limited in the subnet.
Since the "safe city" monitoring network is a very large scale network, you can only use distributed scenarios, from various sources, using available public data networks, should be "safe city" monitoring network for a better choice.
More feasible ways are of two kinds: one is in data acquisition front directly integrated chip will be collecting data access existing network, the other is in monitoring the front-end data acquisition and control center between traditional public data network.
For the former, European airport and other key regions already have application, and there are several companies offering related products, such as Siemens GSM transceiver module, Microlinear company ML2700 series 900MHz FSK transceiver module, NXP's RF module, AnyDATA CDMA access module of the company, as well as other companies such as CDPD access modes.These devices will be the front-end acquisition data directly through a wireless protocol into the wireless network, but not enough of this approach is to require better software for high compression ratio.
There are also some ports module directly to data access Ethernet, but this access mode with delay too much, not enough Fragged, etc.
So, for now, a better way may still take advantage of the wireless network.
The selected network there are many, such as GSM, GPRS, CDMA, CDPD, 3G, etc. Of course, with Ethernet bandwidth, IP in many areas to walk the way the market is not small. In fact, for larger networks, the rate is important, so the GSM and GPRS is not able to take on the "safe city" monitoring network for data transmission, relatively CDMA and CDPD in rate and security, has some advantages, but with the 3 g network deployment and evolution, in the short term may be the best transport platform, but in the long term, along with the expansion of the national monitoring network, 3G may be important to the future ' is still dependent on 4G technology.
In fact, different transmission technology has advantages and disadvantages, depending on the application sometimes affected by market factors.
Management platform will provide versatile, high-security direction of evolution
For the present traditional monitoring network, the importance of software is not genuine, basically stay in a simple image storage, call, simple network transmission and very simple PTZ control this level.
This may be because of the scale is small. But in the "safe city" such very large monitoring network inside the software will be in the core.
Because of this very large networks, is distributed scenarios, it is basically the importance of software along with the network size and the level of increases.
In the software, will contain the following three types of functions:1. the development trend of network functions
Through the network to achieve the level of information sharing between the central server software as the control center, through the various layers of the server software, the following layers widget into an organic whole, and really realize the integration of the monitoring network, so that the whole network linkage.
2. more and more powerful control features
Networks of large size determines the control software development trend of increasingly powerful control features, including powerful hard disk management features, in order to improve hard disk utilization and access speed of the storage group management technology; high-efficiency playback point and timing information replay technology; formation of the three-dimensional, Omni-directional alarm response of the electronic map display, sound, head, matrix, shot, Internet, and other interactive features.
3. increasingly strong user and security management capabilities
As a very large monitoring network, whether the information itself or the security technology that is crucial.
Various security devices need to be consolidated, alarm and security require reasonable rating, all levels of administrative permissions need to be certified, all kinds of events need to be a reasonable classification and consolidation, there are the usual network facing external illegal intrusion, etc.
4. higher signal processing functions
In the emerging software, implant more signal processing functions will also be monitoring software of a trend.
Because of the dispersion of resources and technology time span large bound to create data format confusion, if software implantation file format conversion feature, you can apply different formatting of data into a standard format, which integrates social resources and public resources to reflect the considerable advantages.
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