Solutions for Railway Intelligent Network Video Surveillance System

1. Overview:

In recent years, with the continuous deepening of the information reform of the railway system, network technology has been widely used in the daily production and management of the railway system. At present, as an important transportation department of the country, the daily stable operation of the railway system determines the normal operation of national production and life. In addition, the railway system has many departments, scattered locations, and complex on-site environments, which have become the main obstacles to daily maintenance work.

The implementation of a remote network video monitoring system within the railway system will greatly solve the above contradictions. The remote network video monitoring system adopts embedded WEB server technology. Operators and leaders of various departments can use the existing computer network and office computers of the railway system to monitor all monitoring sites or local crossings, stations and railway environments in the dispatching center or local locomotive depot, greatly reducing the workload of daily personnel inspections, facilitating the timely discovery of dangerous hidden dangers and ensuring safe production.

2. Demand analysis:

1. Using the existing network conditions of the railway, in view of the characteristics of the scattered and difficult-to-manage railway monitoring points, the railway network video monitoring system has the following specific functions:

2. Concentrate on densely populated places such as station squares, waiting halls and passenger passages, and monitor the safety of multiple sites at the same time through the multi-screen display function of the monitoring system.

3. Railway freight yards are wide and need to monitor the security of the freight yards at all times.

4. Use dedicated communication lines to centrally monitor unmanned substations and important power distribution equipment such as lighting along the railway to keep abreast of the equipment operation.

5. Monitor the flow of people and vehicles at important crossings and intersections at any time to ensure the safe operation of vehicles.

6. Use the electronic map function to display static images to comprehensively and intuitively reflect the operating conditions along the railway. It has a TV wall function and displays the required video signals, digital signals, and analog signals dynamically. The system can make timely speed limit connections based on the weather information alarm signals along the way, and respond to emergencies such as mudslides, floods, and traffic accidents in a timely manner.

1. "Distributed monitoring management" structure:

The so-called "distributed monitoring management" means that in a large-scale monitoring management system, in order to avoid the top-level organization from being too busy to manage and omissions, the whole system is divided into several blocks/groups and multi-level management, just like a country from the central government to the province, city, district and county, with subordinate management at all levels. A city can only manage the districts within the city, and cannot manage across the city, while the top-level central organization can manage to the grassroots through the intermediate organizations at all levels. As shown in Figure 1:



2. Duplex video intercom:

In the structure diagram of Figure 1, the sub-district center and the sites under its jurisdiction can have two-way intercom calls through the Elepus network Elepus network video codec; when there are 2 or more call requests at the same time, the system will automatically sort them in chronological order and answer the intercom. The central center can have two-way intercoms with any sub-district center. Similarly, when there are 2 or more calls at the same time, the sub-district center cannot have intercoms with non-jurisdictional sites. While two-way intercom, the center also hopes to be able to see the image of the site, so the synchronous transmission and immediacy of image and voice are the key to the system. If the transmission bandwidth is limited, the image is only transmitted from bottom to top, so it is only visible in one direction, that is, the superior can view the image of the subordinate, but the subordinate cannot see the image of the superior. This is in line with the management system and has a relatively high cost performance.

3. System composition

The remote network video monitoring system based on the embedded WEB server as the core is very different from the traditional analog monitoring and PC-based monitoring methods in terms of networking. The whole monitoring system is mainly composed of three interconnected parts: field equipment (or substation equipment for short), channel transmission equipment and dispatching/central control station, dispatching center monitoring terminal (or master station equipment for short). Now introduce them separately.

1. Substation equipment

It is mainly composed of front-end equipment and Elops network video codec. Front-end equipment, such as monitoring cameras (color or black and white, fixed or movable pan/tilt, fixed focus or zoom), various alarm input/output devices are exactly the same as the equipment used by traditional industrial televisions. Therefore, the core of the substation equipment is the Elops network video codec. This system uses an embedded operating system. This device can integrate the access and control of the camera, the digitization of the image, the compression coding, and the network transmission into one device, which is extremely convenient to install and debug. At the same time, since this device can be remotely set up and managed through the network, there is no need for daily maintenance on site. In actual installation and use, the real-time, stability, and reliability of the system are greatly improved compared to the microcomputer platform, and the daily maintenance workload is quite small, which is very suitable for unattended environments. After the remote network video monitoring system is installed with a video server, it can completely replace the role of the video matrix. Not only is the equipment installation and debugging simple, but more importantly, it can support multiple users in the network to watch or control all monitoring sites at the same time, which is of greater significance to monitoring work.

2. Channel transmission equipment

This part of the equipment should be selected according to the communication channel. At present, there are mainly three types: digital dedicated line (wired or wireless), ISDN, and network (wired or wireless). To achieve a relatively satisfactory image quality, the channel bandwidth is recommended to be above 384Kbps.

3. Main station equipment

The main station equipment mainly realizes the centralized management of login users and substation equipment, video image decompression, storage and other functions. A simple main station consists of one or several monitoring terminals, which often complete one-to-one or one-to-many video monitoring tasks in a time-sharing form. If it is necessary to realize monitoring tasks such as alarm and video recording, the main station equipment can add an alarm database server, a digital video database server, multiple monitoring terminals and a large number of auxiliary monitoring terminals. In this way, the user only needs to establish a video system server in the railway bureau dispatching center. The bureau leaders, chief engineers and related departments can use existing office computers to establish sub-control terminals. Several monitoring terminals can also be conveniently established in the dispatching office and the centralized control station. These monitoring terminals do not need to lay special microcomputers and video/control cables. Using IE browser, you can monitor different locations such as stations, crossings and business halls within the jurisdiction in the office, and complete user management through the video system server; locomotive depot, camera grouping; remote control priority setting and scheduling; video image storage, retrieval and playback and other functions. The electronic map module provided by the system runs with the monitoring center server software. Images can be viewed with IE browser on any client on the Internet. It is convenient to view each monitoring site and intuitively display maps at all levels. It is worth mentioning that this video system adopts WEB technology and standards, which is compatible with other systems such as the enterprise MIS system, and has become an important part of the internal information management of the enterprise.

The central server can transmit the video stream to the center's TV wall, and the on-duty personnel can clearly and intuitively monitor the video transmitted by each substation and make decisions in time. This system can also be perfectly integrated with the GIS system to minimize the impact of various geographical environment changes.

4. System functions

Real-time 24-hour video monitoring of key parts of the computer room, which can be digitally recorded for later use. The system can connect a large number of alarm devices, such as door magnets, infrared, smoke sensors, glass breakers, etc. Once an abnormal signal is captured, the system can automatically alarm, upload alarm information and perform local and remote digital recording. Access

control interfaces can be added to the system, which can seamlessly access the access control system and strengthen the management of people entering and leaving the computer room. Through audio and video monitoring, the computer room managers can see the working conditions of the computer room equipment and on-site staff anytime and anywhere, and can also communicate with local personnel to enhance the interactivity of computer room management.

Combined with the local power distribution system, such as primary power distribution, secondary power distribution, UPS and lightning arrester, the staff can get the power supply status of the computer room anytime and anywhere.

The system combines a large number of professional environmental monitoring equipment to timely respond to data from equipment room environmental protection equipment such as air conditioning systems, temperature and humidity, fresh air fans, and water leakage monitoring.

The system can set alarm upper and lower limits for all equipment. If any equipment data exceeds this range, the system can generate an alarm signal. It can also link equipment within a certain range, such as video recording, backup generators, sprinklers, fresh air fans, etc.

The monitoring system should have a friendly human-computer dialogue interface and Chinese character support capabilities; fault alarms should have obvious sound and light forms.

IV. System Features

1. Digitalization: With the continuous improvement of science and technology, digital products are equipped with powerful functions, flexible operability, network servers, remote management and other comprehensive functions.

2. Full networking: Through the WAN network, the network video server can transmit high-quality images, sounds, and control signals, which is very convenient for managers to view any image and intercom at any time and anywhere.

3. Perfect combination of digital technology and analog equipment.

4. Reliability: The system is composed of reliable and compatible equipment to ensure long-term reliable operation of the system.

5. Flexible and practical: The design of the entire system is based on user needs, user-oriented, very humanized, easy to operate and practical.

6. Scalability: The selected equipment has strong compatibility and scalability, which is convenient for the enrichment, improvement and upgrading of the system.

V. System topology:



Topology diagram

As an important transportation department of the country, its daily stable operation determines the normal operation of national production and life. In addition, the railway system has many departments, scattered locations, and complex on-site environment, which has become the main obstacle to daily maintenance work. The implementation of a remote network video monitoring system within the railway system will greatly solve the above contradictions. Establish a remote network video system. Operators and leaders of various departments can use the existing computer network and office microcomputers of the railway system to monitor all monitoring sites or local crossings, stations and railway environments in the dispatching center or local locomotive depot, which greatly reduces the workload of daily personnel inspections, facilitates timely discovery of dangerous hidden dangers, and ensures safe production.

System design description:

1) First, establish a wireless network covering stations, freight yards, and crossings.

Wireless network technology is a very mature technology with internationally standardized IEEE802.11 series standards. According to the needs of the railway department and the specific geographical situation analysis, the system design scheme is based on the design principle of high-power base stations plus special directional pattern antennas. If there are special places that cannot be covered, consider using relay methods to achieve targeted and comprehensive coverage of wireless signals.

2) Monitoring point: The wireless network camera using embedded technology is very suitable for unmanned work in the field on the one hand, and combined with the wireless LAN on the other hand, it can use the IP network to transmit on-site images, which is very suitable for long-distance monitoring.

3) Central control room: The wireless network is finally combined with the internal wired network in the central control room. The staff in the central control room can watch the on-site situation through the monitoring software on the monitoring server of the high-end PC, or use the projector to project the image onto the screen for multiple people to watch, or to conduct centralized command on the spot. If necessary, the on-site images can be recorded through another server for archiving or playback. The

railway locomotive depot occupies a large area, has many departments, and has complex personnel. It undertakes important tasks such as vehicle dispatching, maintenance, and repair, as well as tasks such as cargo transportation, inspection, and storage. Therefore, the management and safety of the locomotive depot are the primary considerations.

The use of advanced television monitoring security equipment can effectively strengthen the management of the locomotive depot, intuitively and timely reflect the on-site situation of important locations, strengthen safety measures, and truthfully display and record on-site image data of various places. It is a powerful tool for the modern management of the locomotive depot.

This system ensures that images at all levels are clear and realistic, and meets the image processing quality; it absolutely guarantees the quality of the equipment, the stability of the system, and reliable control. It can work continuously day and night, and has the characteristics of easy operation, easy to learn and use; it meets the various monitoring and control functions of users; the system has a certain expansion redundancy and can be expanded and upgraded at any time; under the premise of ensuring the above items, it carefully selects and scientifically configures to reduce the cost.

System Features

Adopt advanced digital monitoring equipment, which is fully functional and easy to operate;
based on the development of existing LAN equipment, it saves expenses while ensuring the effect;
the main control room can monitor the situation of each monitoring point at any time through the computer and can check the video data;
it can control the action of the PTZ lens;
the external monitoring device is beautiful in appearance;
each sub-control room can monitor and record local image data, and can control the action of the PTZ lens;
all video data can be saved on a variety of media, such as CD-ROM, DVD;
the entire system has a certain expansion capacity.