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Analysis of the Structure of the Components of Freeway Wireless Video Surveillance
According to statistics, the total length of highways in China has reached 30,000 kilometers, making it the second country in the world with the largest number of expressways. In addition, in order to further expand our country's transportation capacity, China plans to complete the construction of a highway with a total length of 70,000 kilometers before 2020.
In fact, video surveillance systems are required to assist both in highway construction and after use. During the construction of the expressway, the video surveillance system can effectively improve the supervision and management efficiency of the project; after the expressway is put into use, the video surveillance system can also serve as a traffic condition monitor, which saves a lot of manpower and material resources for the traffic department.
However, various problems will be encountered in the construction of a video surveillance system for highways, and geographical location is one of the obvious problems. As we all know, highways are generally built in relatively remote areas, or between cities, and the span of space is generally very large. The difficulty and investment in building a cable video surveillance system are quite large, so it is now dedicated to highways. Most video surveillance systems use wireless transmission, which is what we often call a wireless video surveillance system.
The highway section uses wireless monitoring and transmission to transmit surveillance video images to the traffic bureau to which the road section belongs. Each toll station can upload the monitoring image to the server of the video surveillance system through the original wired network of the toll station, and the traffic bureau can log in to the client to monitor all the images.
Highway-specific wireless video surveillance systems can be divided into provinces, cities, and regions to form a large-scale video surveillance network. Each sub-monitoring system does not interfere with each other and operates independently, and higher-level organizations can access the surveillance video of each lower sub-monitoring system through the special network of the Bureau of Transportation.
Lian Road wireless video surveillance system real shot diagram is as follows:
Lian Technology's highway wireless video surveillance system has three parts: front-end acquisition (surveillance camera), mid-end transmission (wireless bridge), back-end monitoring (display, storage equipment)
1, the front-end acquisition (surveillance camera) points of attention:
1, long-range night vision shooting function, after all, the distance of each section of the highway is very far, and there are vehicles running day and night, so even if there are lights on the road can not provide a good shooting environment for the general surveillance camera. Therefore, surveillance cameras working on highways must have long-distance, nighttime shooting capabilities.
2. The light suppression function mentioned above mentioned the shooting environment at night. Now it is back to the shooting environment during the day. During the daytime, strong sunlight exposure is inevitable. Therefore, in order to avoid abnormal images caused by excessive light irradiation, the camera must have strong light suppression.
3, all-weather monitoring function, work in the outdoors will inevitably encounter high temperature, low temperature, wind and rain, dense fog and other weather, so the surveillance cameras working on the highway must have industrial-grade waterproof and dustproof, cold and cold, fog and other functions .
4, support for WEB browsing capabilities, to facilitate management personnel through PCs, mobile phones and other devices to view the network monitoring images.
2. Note on terminal transmission (wireless bridge):
1. Strong anti-jamming and stable transmission function. As mentioned above, the environment where the expressway is located is relatively complex. Therefore, the anti-interference ability and stability of the wireless transmission equipment (wireless bridge) must be maintained. It is recommended to use strong anti-interference ability. 5.8G wireless bridges, such as LA-PTP5-23P (point-to-point 20km), LA-PTP5-NP (point-to-point 100km)
2, multi-hop level loss, long-distance relay transmission function, the distance of the highway is often more than a dozen kilometers or tens of kilometers, so you must use that kind of transmission distance, can continuously relay wireless bridge, such as LA-8000DH (point to point 30 kilometers) and so on.
3, the industrial level of work, with the above-mentioned surveillance cameras, long-term work in the outdoors must ensure that the equipment of high-strength quality, with industrial-grade dustproof and waterproof, heat and cold resistance and other properties, it is recommended that the use of industrial-grade wireless network bridge.
3, back-end monitoring (monitors, storage devices)
1. Support concurrent video live broadcasting function: The system supports unicast or multi-cast, real-time remote monitoring, display by rotation, etc.
2. Support distributed storage management functions: Make data storage hierarchical and networked, and support automatic, manual or task-based recording, retrieval, or playback functions.