Analysis of 3G wireless rapid deployment monitoring system technology implementation

    With the development of 3G wireless network, the application of wireless mobile video surveillance has been further promoted. When emergency disasters and public safety incidents occur, government departments are required to respond quickly, and various functional departments and units must exchange information, cooperate and take effective measures to better protect people's lives and property safety, especially putting forward higher requirements for public security emergency command. The wireless rapid deployment monitoring system is flexible and has irreplaceable advantages over traditional fixed-point video surveillance in emergency disaster and emergency incident work. The system plays an active auxiliary role in disaster information acquisition, information sharing, situation assessment, command decision-making, etc., to achieve unified command, unified deployment, and unified action, and provide first-hand on-site information to leaders at all levels participating in actual combat command in real time, so as to achieve the purpose of quickly and efficiently handling various emergency incidents.

    1. Practical requirements for on-site command

    In the work of handling emergency incidents, how to quickly respond to emergencies and how to timely and accurately grasp the first-hand on-site video data of emergency incidents play an important role in handling emergencies. We will build a 3G wireless rapid deployment monitoring system based on the actual needs of on-site command of emergency response. The system requirements are to be able to view and control the remote monitoring images of the 3G wireless public network in real time in the public security video network, and at the same time to achieve safe isolation of internal and external networks, so as to meet the actual needs of emergency response command. The requirements of the system equipment are as follows.

    1. The demand for front-end video control terminals.

    3G single-soldier video control terminals must be fast to move, easy to set up, rainproof, high temperature proof, independently powered, and able to operate independently for a long time. In an emergency, the staff can quickly set up the front-end video control terminal on site and transmit the on-site images of the emergency to the command center in a timely manner.

    2. The demand for vehicle-mounted video control terminals.

    The vehicle-mounted video control terminal is mainly installed in 3G monitoring vehicles. It needs to be fast-moving, easy-to-operate, and have a combination of independent power supply and vehicle-mounted power supply, and can be used for long-term mobile transmission. The staff can use the vehicle-mounted video monitoring and transmission system to transmit the on-site monitoring images to the command center in real time according to the handling requirements of the on-site emergency.

    3. Monitor access platform requirements.

    The monitoring access platform mainly consists of 3G video management server, 3G video decoder, public security video encoder, etc. It can undertake the access service of front-end 3G equipment, encode and decode the video of the front-end 3G video control terminal, upload it to the video management platform of the public security network, and realize the real-time viewing and control of 3G images in the public security video network.

    2. Implementation of the overall system architecture

    1. Overall system architecture

    The system architecture is mainly divided into several parts: 3G single-soldier video control terminal, vehicle-mounted video control terminal, 3G video management server, 3G video decoder, public security video encoder, etc.

    2. Overall technical implementation of the system

    The front end of wireless rapid deployment. It is mainly divided into two types: 3G single-soldier video deployment terminal and vehicle-mounted video deployment terminal. The 3G deployment terminal has its own battery or is powered by the vehicle, and can operate independently for a long time. The 3G deployment terminal has the function of rainproof and high temperature resistance, and can be reasonably installed and set up according to the actual work, such as the roof of the building, the balcony and window of the building, the commanding height of the scene, or at a temporary installation point that can ensure the safety of the equipment. It can even be carried by a single soldier for on-site tracking shooting and transmission.

    3G wireless transmission network. Each set of 3G wireless rapid deployment front end is equipped with 1 to 2 3G wireless public network transmission cards, which transmit the monitoring images of 3G single-soldier video control terminals and vehicle-mounted video control terminals to the equipment room of the command center in real time through the operator's wireless public network.

    Video management server. The 3G video server is installed in the computer room of the municipal bureau command center. It can manage and set the front-end 3G individual video control terminal, vehicle-mounted video control terminal, and 3G video decoder in a unified manner through a dedicated connection line, and at the same time assume the video forwarding function of the wireless public network.

    3G video decoder. Accepts the unified management of the video management server, decodes the images sent back by the 3G single-soldier video control terminal and the vehicle-mounted video control terminal. One video decoder corresponds to one video control terminal. The decoded images will be connected to the video encoder of the public security network. At the same time, it receives the control signal from the encoder of the public security network and sends it back to the front end of the 3G wireless rapid deployment.

    Public security video encoder. The public security video encoder encodes the image after 3G video decoding and uploads it to the public security network, and connects to the public security video monitoring platform. At the same time, the public security video encoder also undertakes the task of video recording storage, and is responsible for returning the control signaling sent by the public security video monitoring platform to the reverse data control interface of the 3G video decoder, realizing the remote control of the front-end 3G image by the public security network video monitoring platform.

    3. Description of main equipment of the system

    3G single-soldier video control terminal. The 3G single-soldier video control terminal uses a 3G wireless transmission module, which can support communication modes such as Telecom EVDO, Unicom WCDMA, and Mobile TD. The image captured by the camera on the top of the single-soldier video control terminal is transmitted to the 3G system management center and 3G video forwarding unit in the equipment room of the command center through the 3G module. After image decoding, it is connected to the video forwarding unit (streaming media) of the public security command center to ensure that the command center has a small delay when processing 3G video images and the control is stable and reliable. The description of the 3G single-soldier video control terminal is as follows:

    It is rainproof, sun-proof and high-temperature resistant; it is equipped with a high-power battery to support long-term independent battery-powered operation, and is also equipped with a high-power backup battery; in an environment with AC power, it has the AC power access function to further enhance the usage time; the front-end camera has remote PTZ and other control functions, and the command center can remotely control the front-end camera to adjust the real-time monitoring angle and visual range; the front-end equipment needs to be quickly and conveniently installed, and can be installed manually and concealed according to specific circumstances; it has an independent transport suitcase for quick response.

    Vehicle video control terminal. The vehicle video control terminal consists of a vehicle PTZ camera, in-vehicle control display equipment, 3G video transmission module, 3G image wireless receiving equipment, etc. The vehicle video control terminal equipment consists of a 3G vehicle video terminal, 3G antenna, 3G card, cigarette lighter, etc. The images taken by the 3G vehicle video control terminal module and the vehicle monitoring terminal are directly transmitted to the command center equipment room through 3G transmission equipment (supporting Telecom EVDO, Unicom WCDMA, Mobile TD and other modes).

    Especially in the aspect of rooftop surveillance cameras, since rooftop cameras are the frontier equipment of the surveillance system and the "eyes" of the vehicle-mounted video control terminal, the video image quality of the camera part will affect the effect of the entire system, and it is crucial to reasonably select and configure the camera equipment. The system uses an infrared night vision vehicle-mounted pan-tilt integrated machine with an infrared distance of more than 100 meters, conforming to the all-weather environment design, with a wiper function and super anti-seismic characteristics. It will well meet the function of being able to shoot at night without lighting conditions.

    3. Monitoring access platform description

    1. Video management services

    The 3G platform video management server is installed in the computer room of the municipal bureau command center. It can uniformly allocate resources, manage and set up the front-end 3G individual video control terminals, vehicle-mounted video control terminals, and 3G video decoders through dedicated connection lines.

    2. Video forwarding service

    The central management platform server has the function of video forwarding. When multiple clients need to view the same image of a monitoring point at the same time, it will cause data congestion on a communication network line, seriously wasting network resources.

The server video forwarding unit supports the forwarding of video and audio streams. When multiple clients need to access the same remote screen at the same time, they can forward the data through the forwarding unit of the video server. Only one channel bandwidth network resource is occupied between the forwarding service and the front-end video channel. The video forwarding unit then distributes the data to multiple clients.

    3. Wireless video monitoring terminal

    The system can realize multiple monitoring and control methods. In addition to being able to directly use the public security network video platform for control, in applications where there is no public security network or in a moving vehicle, with authorization, it can also receive and control the front-end multi-channel video monitoring images through the wireless 3G network to meet the different needs of emergency response work.