Notes

The Application of Surveillance System in The Railway
Wireless surveillance systems in the railway infrastructure must route the application form characteristics as well as special environment. In addition to other monitoring applications,a number of special factors should be taking into account, for example the following:

Preset accuracy

Railway control system, in order to quickly locate the scene or perhaps a reaction to the alarm, the buyer will often build multiple presets for future faster usage of applications, preset amount is often no issue, most of the existing camera support 128 or perhaps 256 preset positions, and actual projects will not use so much, though the preset PTZ cameras is usually to examine the accuracy with the important indicators, for example in the event the user set a preset, it is referred to as future, and several camera preset position will likely be offset shift, to ensure had to be manually re-tuning, preset bit lost its meaning, affect use.

Long-range camera

Another application is the railway over the railway. Long may need to monitor tens of meters from the camera, a number of hundred meters or several kilometers, then, so that long-range camera may need to look a few kilometers in the effect. Hope is not a simple camera camera longer focal length lens. When the focal length should be pulled manually control the laptop keyboard challenging to find a distant target. In other words, the camera's micro-step control is critical. In addition, high-altitude look camera, anti-shake, night vision lighting troubles are important considerations.

Natural phenomena

Wind, rain, thunder is a huge test in the outdoor cameras, each link could cause damage to system maintenance costs soar. The railway project is seen as a large span, often similar to finding far, sometimes high across the ground, and also the system running to get jobs once opened will face many restrictions, leading to increased costs. Therefore, Rail strategic advisor , installation, wiring and high-quality camera itself is especially vital.

Selection from the encoder and DVR

High-speed rail projects, the encoder and DVR usually are deployed at various sites scattered from the 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 plus much more, therefore the requirement for encoder devices could work with a local cache, a short lived terminal within the network video not lost the truth, after the network is restored on 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 should be considered.

Coding Standards

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