With the progress of social development, strengthening emergency management, improving the ability to prevent and deal with public emergencies, and maximally preventing and reducing public emergencies and the damage caused by them have become the maintenance of national security and social stability and the promotion of the economy. An important guarantee for comprehensive, coordinated and sustainable development of society.
As an important part of the security and emergency system, the emergency command and dispatch platform can provide functions such as voice, video and data collection, transmission, storage and processing, and realize the “zero distance†emergency response of the emergency rescue command center to the emergency scene. Processing and command.
The information transmission of the emergency command and dispatch system is based on the fusion application of wired network and wireless network. Generally, in areas with perfect network infrastructure, the private network and the public network platform are used to carry out system construction and information transmission of command centers at various levels, such as command and dispatch network, public security network, government private network, and the Internet. Another important component of the command and dispatch system is the access to the mobile emergency command equipment system. The mobile devices such as the individual vehicles carried by the vehicle and the fire scouts on the command vehicle need to realize the video and audio interaction in the wireless network environment to solve the two-way video and audio communication problem between the accident scene and the command center.
In recent years, the successful popularization of 3G networks has led to the emergence of emergency communication equipment based on 3G networks. At present, some 3G transmission equipments on the market have solved the problem of image uploading of the emergency command system. However, due to the limitation of the bandwidth of the 3G network and the bottleneck of the video codec technology, the resolution of the video is still low and the delay is large. Huaping's HDS wireless car video terminal and NDS wireless soldier video terminal use H.264 High Profile (level 5) and multi-stream technology, the video accuracy is doubled compared with the ordinary H.264 code, and the individual equipment only It takes 128K bandwidth to realize D1 video transmission, and the in-vehicle device can realize 720P (1080P) HD video compression transmission with only 512K bandwidth, even under the lower bandwidth 3G, WIFI and other wireless network conditions. The high-definition video images and audio signals collected by the command vehicle and firefighters at the scene of the accident are transmitted to the command center in real time to fully meet the application requirements of real-time monitoring, video communication and visual scheduling of the emergency command process. Provide long-distance, high-rate wireless real-time transmission for fire command, rescue, fire, reconnaissance, etc., greatly improving the speed and efficiency of emergency command and dispatch.
Wireless networks that support mobile emergency command equipment access as well as satellite networks. At present, the fixed network coverage in the central and eastern regions of China is already comprehensive, but in the vast grasslands and desert areas of the west, there is often no one to smoke. The mobile phones may have no signal, let alone 3G or WIFI; even, the firefighting forces In some remote field rescue and disaster relief activities in the central and eastern regions, there may be no coverage of mobile 3G networks, so vehicles, individual soldiers and other equipment will not be able to establish contact with the command center. In this case, the availability of satellite communications and its quality issues are particularly important. China's current level of satellite communication technology is weak, operating costs and usage costs are high, and bandwidth is limited. For example, the satellite communication channel generally has a bandwidth of only 1-2M, and can transmit standard definition video, but it is almost impossible to realize high definition video transmission. However, with Huaping's wireless video terminal, higher levels can be achieved in terms of video characteristics such as bit rate, resolution, and frame rate. The original 1080P full HD video communication application that can be realized with 4M satellite bandwidth can be perfectly realized with only 1M or lower bandwidth after using Huaping's wireless video terminal. This also benefits from the video codec technology advantages of Huaping H.264 High Profile (level 5).
It is reported that Huaping has combined this technology with unique audio processing technology, intelligent network adaptation technology, fusion technology, large-scale networking technology, etc., and is perfectly integrated into Huaping's new generation of high-definition video surveillance command system. This system innovatively integrates video surveillance, audio and video conferencing, voice communication, and command and dispatch system services and applications, and fully realizes monitoring points, conference points, individual equipment, in-vehicle equipment, voice intercom equipment, smart phones, PAD and Two-way video and audio communication and image integrated scheduling applications at monitoring management centers or command centers at all levels. The decision makers and related experts will be synchronized to “inspect the sceneâ€, and a scientific command and dispatch plan will be formulated to achieve rapid judgment, scientific decision-making, and precise command, and effectively improve the ability of relevant departments to deal with public security emergencies.
It is believed that with the development of wireless networks such as 4G/LTE and the continuous advancement of satellite communication technologies at home and abroad, the support platform for emergency command and dispatch will be completely changed, which will greatly enrich the information of the system and will greatly increase the speed of the system. Processing capacity. New channel modulation technology, new video coding technology, and new computer network communication technologies will promote the development of image and video information in the emergency command and dispatch system to high definition.
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