From the perspective of operators, video surveillance has developed into an important value-added service for China Telecom, laying a solid foundation for the transformation of China Telecom to integrated information providers. At the same time, in the context of the diversified development of domestic mobile value-added services, monitoring itself is also moving towards mobile and intelligent. The vehicle monitoring product is the vehicle application of the mobile monitoring service. China Telecom's in-vehicle monitoring products rely on the "Global Eye" platform and EV-DO (cdma20001x) wireless network to collect video and other information through the vehicle to realize remote video browsing, remote control and other functions to meet customers' remote video viewing and remote emergency command. The need to provide "global eye" application customers with wireless video surveillance services anytime, anywhere.
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Vehicle mobile monitoring component
The vehicle monitoring framework consists of a three-layer networked integrated supervision system consisting of a vehicle terminal, a transmission network and a monitoring center. It provides vehicle anti-theft, anti-robbery, driving route monitoring, real-time wireless transmission of video images inside and outside the vehicle, rapid response to accidents, call command and other functions. To solve the dynamic management problem of existing vehicles.
Schematic diagram of working principle of vehicle GPS monitoring and positioning system
The vehicle monitor uses a vehicle to install a car video server, and externally connects 3 to 4 cameras. The video server uses EDGE/cdma20001x/Wi-Fi network. The monitoring center can monitor and transmit the images in the vehicle in real time, and adopts dual stream technology. The local recording adopts D1 resolution, and the network transmission uses CIF/QVGA/QCIF resolution. Rate, implementing local code storage and remote storage.
The main components of the vehicle monitoring system are: vehicle terminal (vehicle video server), monitoring center, transmission network, etc. (as shown).
Vehicle terminal
The vehicle-mounted terminal is a front-end device of the vehicle monitoring and management system, and is generally installed in various vehicles in a hidden manner. The vehicle-mounted terminal device is mainly composed of various external devices such as a car video server, an LCD touch screen, an external camera, a call handle, and a car alarm.
The car video server collects audio and video signals and compresses them into digital streams, which are transmitted to the user monitoring center through wireless networks such as cdma20001x to achieve remote monitoring and emergency command. The car video server needs dual code stream simultaneous encoding, including local independent video stream and network code stream.
Users need to extract data from video surveillance. There are two ways: one is through the USB port of the vehicle terminal, and the other is remotely retrieved through EV-DO (cdma20001x, Wi-Fi).
2. monitoring Center
The monitoring center is the core of the dispatching command system. It is a remote visual command and monitoring management platform. It monitors all on-site vehicles and realizes two-way interactive audio and video command. The electronic map of the monitoring center can display the visual location of the vehicle and pass the wireless. The network monitors the vehicle settings. For example, by configuring the pan/tilt, the vehicle front-end camera can be remotely controlled.
At the same time, the monitoring center can realize the real-time, centralized and intuitive monitoring and dispatching of the operational vehicles in the controllable range, and can be connected with the police stations at 110 and 119 to dispatch the police force to the scene in time to prevent the emergency response. effectiveness.
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