Intelligent traffic GPS positioning bus video surveillance system can ensure the normal communication of data and audio and video in the process of vehicle movement, and can locate the position of the vehicle from time to time, fully comply with the strict requirements of the government and enterprises, is fully digital, intelligent, networked, system A typical representative of a wireless monitoring system.
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I. Overview
In recent years, with the development of traffic and the increase in the flow of people, various passenger cars have begun to increase. At the same time, the problem is also followed by overloading, speeding, with prohibited items, etc. often occur. And it often causes considerable difficulties in the supervision of roads that often occur at high speeds or unmanned. Ordinary labor or starting point monitoring has been far from meeting the current supervision, and a modern dynamic time and long-distance bus monitoring system is needed to improve bus supervision.
The modern monitoring system features the following issues:
1, strictly prevent overload
2. Position the bus at the moment
3. Passenger status monitoring
4, strictly guard against overtime driving
5, car speed monitoring
6, bus information from time to time diagnosis
7, abnormal alarm
8, video surveillance and other issues to solve
Second, the system composition
The system consists of the main station with system software, F7623GPS+EVDO router, transmission terminal, video server DVR, camera, control equipment and other equipment.
Control equipment: It can summarize the attendance data of each incoming station and the running status of each vehicle of the vehicle to the central management station for analysis and processing.
Four Letters F7623: The transmission terminal adopts F7623 of Xiamen Sixin to provide users with wireless routing network with safe, high speed, stable and reliable routing and forwarding of various protocols.
Monitoring Center: The monitoring center is responsible for providing VPN access services to a transmission terminal, and simultaneously processing audio, video, and status data to implement system functions such as video surveillance, status monitoring, vehicle positioning, and information services.
Third, the overall system architecture
The system transmits the image of the video camera on the bus or train to the video server DVR, and the video compression coding module of the DVR compresses and encodes it, and then transmits it to the operator's evdo network through the 4G wireless communication terminal F7623 of the four-letter communication, and finally Arriving at the headquarters, realize the functions of video data interaction, transmission/reception, encryption and decryption, plus decoding, link control and maintenance. In this system, we can get the dynamic image returned from the scene and other data information of the vehicle terminal. All the data is transmitted through the VPN tunnel, and the security is guaranteed. At the same time, the DVR supports multiple transmission methods such as: Real-time transmission, timing transmission, trigger transmission.
Fourth, system function
1. According to the platform system, it is possible to count the amount of vehicles in each time period, each train number, and each road section, thereby facilitating the designation of the driving and the deployment of the vehicle scheduling business. The driving plan and the car scheduling business completed the development of the complex production plan for the bus and the management of the daily car scheduling. During the development of the driving plan, the algorithm and implementation were optimized to adapt the function to a wide range of passenger cars. user.
2. The monitoring, dispatching and commanding business completes the monitoring of the vehicle's operating conditions at the site, and adjusts the vehicle operating index in real time according to the complex and variable situation of the site, improves the completion rate of the operating plan, and avoids the production efficiency caused by the after-scheduled scheduling.
3. The decision analysis business is to classify, abstract, organize, and statistic the raw data in the form of statements to provide the company's operational status analysis data from the multi-angle and multi-faceted direction to the company's decision-making leadership.
4. Data exchange system: The data exchange system is based on ACE and combines the characteristics of real-time data monitoring of public transportation monitoring. It has established a good scalability based on the functions of data access, data analysis and data routing. The communication protocol platform greatly reduces the workload caused by system upgrades.
5. Alarm function: When a passenger car encounters a special or unexpected situation during the running process, the alarm information and video can be transmitted back to the headquarters through 3G. The headquarters analyzes the alarm information and video, and collects various measures in a timely and effective manner.
6. Diagnostic function: Through the analysis and analysis of various operating states and parameter indicators of the vehicle, and with the diagnosis of the management engineer, the fault of the vehicle system can be diagnosed in time to ensure the safe operation of the vehicle.
7. Video surveillance: Real-time or timed video information can facilitate the bus administrator to intuitively monitor the train driving status (number of personnel, bus service, bus security, etc.) and provide various effective and powerful various basis.
V. Project structure implementation
1, the collection terminal part
The image acquisition terminal is partially composed of a camera, a video image processor DVR, and various in-vehicle control devices. The camera is responsible for collecting video voice data, and then submitting it to the DVR for compression coding processing. The vehicle control device is responsible for collecting various vehicle operation data.
2. Data transmission terminal
After the DVR collects the image data information, it sends the data to the monitoring center via the Internet. The D762 and EVDO network of the four letters are completed by the DVR and the Internet. F7623CDMA-EVDORouter is the only industrial wireless router in China that uses ARM9 processing as the system platform to maximize the throughput of the system and make the video surveillance image smoother. The transmission device has multiple watchdogs and an online retention mechanism to ensure stable and long-term operation, thus ensuring the reliability of data transmission. At the same time, considering the security problem, the device supports VPN tunnel, fixed IP dialing, and two-way authentication, which fully guarantees the security and stability of the system. The device adopts the WEB configuration and the CLI configuration mode, and the user can put the system into stable operation with only a few simple parameter settings. The F7623 provides an Ethernet port and a serial port. The Ethernet port is used to transmit video voice data, and the serial port is used to transmit information of the car control device.
3. Data center software platform construction
The monitoring center is equipped with a VPN server, which is responsible for providing VPN access services for each transmission terminal (F7623 device); at the same time, the monitoring center separates various data, and the image data can be video surveillance software provided by the DVR provider, or Their SDK is developed; the status information is based on the dynamic link library provided by Sixin to develop various data monitoring software. The task of monitoring the bus video surveillance system is mainly divided into three aspects: video surveillance, status monitoring, vehicle positioning and information services.
Video Surveillance: Transfer video data in the car in real time or at regular intervals.
Status Monitoring: Number of passengers: Record the number of passengers at each station. Driving data: record engine signal, driving speed, switch door, brake information, etc.
Vehicle positioning:
1) Real time location. The current location information of the vehicle is obtained in real time through the GPS module in the in-vehicle device.
2) Line status. Monitor the driving condition of the vehicle on the line and prompt the driver to drive according to the line and schedule.
Information service: automatically play various information, such as: transfer information, weather, road conditions, advertising information, etc.
4, the realization of VPN channel
The following is the network structure diagram implemented by the VPN tunnel. The four-letter evdo wireless router acts as a VPN client and actively connects to the VPN server. The VPN server authenticates it. After the authentication is passed, various tunnel addresses are assigned to each router. In this way, each router on the site and the VPN server of the monitoring center form a private and secure local area network, and each device in the local area network can communicate with each other.
According to the above figure, the terminal is the video server of Bus No. 1 (192.168.1.10) and Bus No. 2 (192.168.1.11). After the VPN tunnel established by the wireless router and the monitoring center, the tunnel IP200.200.200.6 is obtained respectively. And 200.200.200.5, and the central tunnel address is 200.200.200.1, so the three tunnel IPs can be directly accessed each other. If we pass the port mapping and other settings of the server on the router, we can directly access the real-time picture of the passenger car No. 1 and the passenger car No. 2.
Summary
With the continuous improvement of technology and the development of wireless network technology and digital video compression technology, the transmission of video, audio and data on 3G wireless networks has become a trend. In-vehicle wireless video surveillance systems have functions that are unmatched by other wireless surveillance systems. Features: It can ensure the normal communication of data and audio and video in the process of vehicle movement, and can locate the position of the vehicle from time to time, fully comply with the strict requirements of the government and enterprises. It is a typical digital, intelligent, networked and systematic wireless monitoring system. representative. The wireless transmission system solution has been widely used in public transportation vehicles, long-distance transportation vehicles, freight vehicles, special vehicles, public security, fire and armed police on-site command and exploration, as well as emergency emergency command systems such as water flood control, road rescue, urban management supervision.
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