Detailed explanation of bus wireless monitoring system design

In recent years, with the rapid development of our country's economy, the bus passenger transportation industry has developed rapidly. People can reach their destinations quickly and comfortably, which has brought great convenience to people's lives and work. At the same time, safety and management issues in bus operations have gradually become prominent. Disputes between passengers and operators due to service attitude, fare evasion and other issues continue to occur across the country. Illegal cases such as theft, robbery, and bus explosions on public transport vehicles have also occurred. It has occurred, seriously threatening the safety of passengers' bodies and property. Once a major malignant incident occurs, it will have a great impact on society. For example, a serious bus explosion occurred in Kunming in 2008, and the bus burning incident in Chengdu not long ago , both caused many casualties, caused a certain degree of psychological panic to the masses, and also affected the normal operation of highway passenger transport. Therefore, security monitoring on bus passenger transport lines is urgent. By installing a bus wireless monitoring system, these problems that have been plaguing the management of bus companies and relevant departments can be solved.

  System Overview

The bus wireless monitoring system can realize multi-angle real-time monitoring and recording of audio and video information during bus operation, and transmit the information to the monitoring and dispatching center in real time through wireless transmission. The bus company or public security personnel in the center can learn about it in real time. The operation of the vehicle, once an accident occurs, effective measures can be taken immediately to protect the safety of passengers' lives and property, and the video data can provide strong evidence for tracing and assigning responsibilities after disputes and criminal cases occur.

  system structure

The bus wireless monitoring system consists of multiple parts such as in-bus monitoring, wireless transmission, central monitoring and emergency linkage.

Detailed explanation of bus wireless monitoring system design

Monitoring in the bus

A total of 4 cameras are installed in the front, middle and rear of each bus. They are located above the left side of the driver, above the opposite side of the rear door, behind the bus, and one is aimed at the front windshield. Through these 4 cameras, every move of the passengers on the bus can be clearly seen on the on-board monitor while driving. After the bus enters the station and opens the door, the passengers getting on and off the bus can be seen on the monitor. to avoid potential hazards as much as possible.

At the same time, there are alarms installed in the bus, one near the driver, and other alarms distributed in the bus. In an emergency, passengers and drivers can press the alarm button, and the car will immediately sound an alarm to remind passengers to evacuate.

Monitoring information such as video, audio, and alarm in the bus can be connected to the wireless monitoring front-end and wirelessly transmitted back to the bus dispatching and monitoring center in real time for decision-making and command.

3G wireless transmission

The monitoring information in the bus is uploaded to the monitoring center using 3G wireless transmission technology. 3G wireless transmission technology enables deeper integration of traditional security monitoring methods due to its mobility, high bandwidth and other characteristics, and is very suitable for public transportation monitoring.

In the past vehicle-mounted mobile monitoring, wireless transmission technology cannot meet the system requirements well. For example, if GPRS network transmission is used, the bandwidth is too narrow and the video takes up a large amount. Therefore, how to transmit the moving image data to the corresponding monitoring center is realistic. question. The high-bandwidth wireless access of 3G supports uploading images and receiving distant images at any location, so that technical problems that were impossible to achieve in the past can be solved with the improvement of 3G wireless transmission technology.

Different modes of 3G technologies of the three major operators (China Mobile TD-SCDMA, China Telecom CDMAEVDO, China Unicom WCDMA) are gradually achieving network coverage in large and medium-sized cities. Therefore, once mobile phone signals are covered in public transportation lines, coupled with the transmission rate of 3G, even if the vehicle is running at high speed, it will become simple to upload monitoring information in the vehicle, thus improving the ability to handle emergencies. The operational safety of transportation will also be greatly enhanced. The current upload bandwidth of the initial 3G network can reach 384kbps, which is enough to transmit one channel of CIF real-time images. The upgraded version of 3G, HSDPA, will support a maximum transmission rate of 2.8Mbps. High-definition and multi-channel video transmission will make the monitoring of carriages easier.

In this system, the wireless monitoring terminal in the car compresses the video in the car through the video compression encoding module, transmits it to the nearby operator base station through the 3G wireless communication module, and then transmits it back to the bus monitoring center through the VPN network to realize the interaction of video data. Send/receive, encryption and decryption, codec. It integrates the advantages of 3G wireless network and Internet network to ensure normal communication of data and video during vehicle movement.

  monitoring Center

After the bus monitoring information is transmitted back to the monitoring center, it will be managed uniformly by the monitoring and management platform. The monitoring and management platform is mainly composed of a central system management server, streaming media server, WEB server, database server, alarm server, command and dispatch server, GIS server, video server and network storage device, etc., to realize the control and management of all resources of the system. Monitoring personnel monitor the front-end buses through the monitoring management platform.

The bus dispatching and monitoring center uses a decoding matrix to display the in-car surveillance video on the TV wall to monitor the operating status of the vehicle in real time; at the same time, the staff monitoring the seats can also monitor the work on the client through on-demand according to the actual situation. When the personnel clicks the mouse on any vehicle, the vehicle's location, speed, driver's feedback information, etc. can be displayed immediately. By understanding these conditions, voice intercom is used to send instructions to the vehicle driver to achieve intelligent dispatching. For example, during peak periods, the monitoring center can immediately see the flow of vehicles and people, and can immediately decide the increase or decrease of vehicles and solve the problem of bus dispatching.

At the same time, through monitoring information, once suspicious situations are discovered, measures can be taken immediately to avoid major dangerous incidents.

The system is equipped with a network storage device to realize real-time storage of surveillance videos. The storage methods can be timed, manual, alarm storage, etc. to provide a basis for subsequent analysis.

The monitoring center can also set up multiple sub-control centers according to the actual needs of bus transportation. The monitoring center and each sub-control center can be connected through LAN, WAN, or through the Internet network. In the sub-control center, you can check the progress of each vehicle on the road, and you can also perform some tasks assigned by the monitoring center, such as the dispatch of vehicles under the jurisdiction of the fleet.

Emergency linkage

The monitoring system is connected to the public security private network through gate equipment to achieve emergency linkage with public security, traffic control and other government functional departments. If an emergency occurs, the public security and other government functional departments can immediately obtain on-site information, understand the development of the on-site situation in a timely manner, and make decisions. Accurately analyze and judge, respond quickly to incidents, and reduce economic losses and casualties.

  System Features

Complete monitoring and management platform

The bus wireless monitoring system takes the monitoring and management platform as the core to realize the control and management of all monitoring resources. The entire system adopts a distributed architecture. The video surveillance management platform provides hierarchical and decentralized sharing of video resources, which improves the overall efficiency, reliability and cost-effectiveness of the system, and can also realize a variety of user application functions;

Advanced access methods

The system adopts 3G wireless plus VPN network transmission method, which effectively solves the problem of accessing bus mobile video to the monitoring center, achieving large-scale coverage and real-time monitoring without being restricted by area or distance;

Efficient image compression

Adopts the H.264 video compression algorithm with extremely high compression ratio, which consumes low network resources and transmits high-quality and smooth images under low-bandwidth conditions;

Professional and reliable storage

The system supports a highly reliable network storage storage mode. Through the platform recording server, the storage resources in the system storage device can be efficiently managed, virtualization of storage resources can be realized, and distributed storage deployment can also be realized;

Strict information security

Make full use of network tunnels, 128-bit encryption algorithms, firewalls/VPNs, encryption locks, authority management, security authentication, real-time clock and other technologies to ensure that the monitoring system and video recording data are not used or destroyed without authorization;

Convenient operation management

The system uses a graphical interface to provide users with flexible monitoring screen selection, electronic map use, and image capture, video and video playback, alarm and alarm linkage functions;

Rapid emergency linkage

By sharing surveillance information with public security and other government functional departments, we can realize emergency linkage in emergencies and enhance rapid response capabilities, command capabilities, and emergency response capabilities.

Conclusion

The bus wireless monitoring system can effectively prevent and control the occurrence of emergencies on bus lines and ensure the safety of people's lives and property. After establishing the system, passenger transport companies and management departments can understand the operation status of vehicles and rationally allocate transport capacity; at the same time, in case of occurrence Any abnormal situation can be detected in time through the camera and dealt with urgently, which is of extremely important significance for combating crime and terrorist actions, maintaining social harmony and stability, and protecting citizens' lives and property.