Notes

The Application of Surveillance System in The Railway
Wireless surveillance systems inside the railway infrastructure need to route the approval characteristics and its special environment. In addition to other monitoring applications,various special factors must be taking into account, like the following:

Preset accuracy

Railway control system, to be able to quickly locate the scene or in response to the alarm, the customer in most cases create multiple presets for future faster access to applications, preset amount is generally no problem, most of the existing camera support 128 or even 256 preset positions, and actual projects won't use so much, however the preset PTZ cameras is to examine the accuracy with the important indicators, for example in the event the user set a preset, it's referred to as future, and some camera preset position will likely be offset shift, to ensure needed to be manually re-tuning, preset bit lost its meaning, affect use.

Long-range camera

Another application is the railway along the railway. Long may need to monitor tens of meters away from the camera, a couple of hundred meters or several kilometers, then, meaning long-range camera may have to look several kilometers in the effect. Hope is not a simple camera camera longer focal length lens. When the focal length must be pulled manually control the keyboard difficult to get a distant target. In other words, the camera's micro-step control is vital. In addition, high-altitude look camera, anti-shake, night vision lighting troubles are all important considerations.

Natural phenomena

Wind, rain, thunder is a test from the outdoor cameras, each link can cause injury to system maintenance costs soar. The railway project is characterized by large span, often akin to finding far, sometimes high across the ground, along with the system running to get jobs once opened will face many restrictions, causing increased costs. Therefore, the outdoor camera selection, installation, wiring and high-quality camera itself is particularly crucial.

Railway project planning in the encoder and DVR

High-speed rail projects, the encoder and DVR are often deployed at various sites scattered inside engine room, therefore, the encoder and DVR needs to have ultra-stable performance (embedded encoder and embedded DVR is preferred), good networking capabilities, remote management and upgrade capabilities. As the complexity of network systems architecture, large span, routing and more, and so the requirement of encoder devices perform using a local cache, a short lived terminal in the network video not lost the case, once the network is restored towards the video supplement towards the NVR storage. In addition, the picture resolution, dual-stream support, two-way audio support, alarm input and output quantity indicators are to be considered.

Coding Standards

At present, the railway project is primarily used in MPEG-4 encoding technology and H.264 encoding technology, the longer term deployment of AVS could be encoded using intra-frame compression and inter-frame compression to get rid of approach to combining video information redundancy by the due date and space more than information. Coding equipment delay must be under 300ms, forward delay at intervals of level must be less than 500ms, the decoding device delay needs to be lower than 300ms, PTZ response latency ought to be under 500ms, wireless surveillance system monitors the front-end collection devices towards the user terminal delay must not exceed 3s.
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