chrispeng [ad_1]
plan selection
After comparative analysis, we chose China Mobile’s GPRS system as the data communication platform for the traffic police vehicle management information system. China Mobile’s GPRS system can provide wide-area wireless IP connections. Building a traffic police vehicle management information system on the GPRS service platform of a mobile communication company to realize wireless data transmission of illegal information has the advantages of making full use of the existing network, shortening the construction period, and reducing the construction cost, and the equipment is easy to install and easy to maintain.
Advantages of GPRS data transmission
1. Wide coverage: Due to the particularity of traffic police vehicle management, a wide range of data communication is required, with unlimited capacity expansion and unlimited access locations, which can meet the access needs of mountainous areas, towns, and cross-regions. Due to the large number of handheld mobile terminals distributed in a wide range, some handheld mobile terminals are located in remote areas and geographically dispersed.
In addition, the possibility of future system expansion must also be considered, and it must have good scalability. Since GPRS has covered most areas in the province, it can meet the coverage requirements of the traffic police vehicle management information system.
2. The data transmission rate is high. The data transmission volume of each hand-held mobile terminal is within 10Kbps per card swiping. At present, the actual data transmission rate of GPRS is about 40Kbps, which can fully meet the data transmission rate (≥10Kbps) requirements of this system.
3. The transmission capacity of the system is large. The data center station must realize real-time connection with each handheld mobile terminal. Due to the large number of handheld mobile terminals, the system requirements can meet the needs of sudden data transmission. GPRS technology is especially suitable for continuous, bursty and frequent, small amount of data transmission, and it is also suitable for occasional large data transmission.
4. The communication cost is low. The monthly fee is adopted, and the communication cost is low.
5. Good real-time response and processing capabilities. Because GPRS has real-time online characteristics, the system has no time delay, which can well meet the real-time requirements of the system for data collection and transmission.
Solution introduction
(1) System structure
1. Handheld mobile terminal: SG2000 mobile POS terminal is used to access the dedicated GPRS network provided by the mobile company. The computer of the handheld mobile terminal runs system software and application software. The network has no restrictions on the access location, time, and number of handheld mobile terminals, and can be increased or decreased at any time. It can meet the needs of mountainous areas, remote areas and cross-regional access.
2. Traffic violation data center: The data center installation includes Radius authentication server, application server, storage equipment, backup equipment, network security system, network management workstation and other equipment. Use the DDN dedicated line provided by the Provincial Mobile Communications Company to connect to the GPRS network. As the DDN dedicated line can provide higher bandwidth, when the number of handheld mobile terminals increases, the center can meet the demand without expansion.
3. GPRS data transmission
Based on China Mobile’s GPRS wireless data network, the data transfer rate can reach 171Kbps, and it can be seamlessly compatible with CDMA data networks.
The traffic violation data center uses lines and interfaces provided by China Mobile. Each handheld mobile terminal uses the unified STK card of the mobile communication company. At the same time, the public security traffic police data center registers each point and saves relevant information for identification, maintenance and processing. The STK card used by the handheld mobile terminal can only be used for data communication with the public security traffic police data center. Each handheld mobile terminal runs the original system software and application software, supports 24-hour real-time online, and realizes the 24-hour data transmission of the handheld mobile terminal.
Any handheld mobile terminal authorized by the Public Security Traffic Management Bureau can use this system:
1. The handheld mobile terminal must use the mobile unified STK card, and the user can only use this card for data communication with the public security traffic police.
2. The terminal equipment used is the GPRS mobile terminal equipment provided by Zoomlion.
3. User registration: Comply with the regulations of the Public Security Traffic Management Bureau.
(2) Product characteristics
ST2000 series GPRS mobile terminal: Police mobile terminal must be easy to carry, easy to operate, not suitable for damage and long battery life. After analysis and comparison, we choose SG2000 series GPRS handheld terminal. SG2000 series GPRS handheld terminal adopts 32-bit dual CPU configuration technology, and the maximum computing speed can reach 73Mbps; the product has sufficient memory and expansion space: adopts large-capacity 16M Flash memory, and can be expanded to 32M, 64M and 128M.
The product is based on the open LINUX software platform. The product has a large LCD touch screen with a flexible and variable brightness control. It can obtain a satisfactory display effect regardless of whether it is outdoors under sunlight or indoors in the dead of night. At the same time, the original touch screen input method, clear operation prompts, and support Chinese character menu display, easy to operate and use, customers can easily master various business operations without training. The product supports both GPRS wireless and telephone line dialing data transmission functions. It can use China Mobile’s GPRS wireless dialing to realize data transmission, getting rid of the limitation of wired cables, and can be deployed quickly and in large quantities in various occasions. An industry with frequent business and scattered locations. However, in areas not covered by the current GPRS wireless signal, the built-in wired MODEM can also be used to realize data transmission through telephone line dialing. Users can conveniently switch between wireless and wired networks according to their needs to meet the needs of users for installation, configuration and use in various occasions. The product has a built-in 3600mAH rechargeable lithium battery, which can ensure continuous work for a long time, and can work continuously for 150 hours. It has the characteristics of complete functions, convenient operation, easy installation and configuration, and strong scalability.
Technical indicators of dedicated mobile handheld terminal:
Item index
Environmental requirements Range of use: temperature 0℃～+40℃, humidity 20%～90%.
Storage range: temperature -20℃～+70℃, humidity 10%～90%.
Operating system LINUX operating system
Current parameters The starting current is 50mA～200mA.
The average printing current is 1A.
Voltage Charging voltage AC110V～240V.
Working voltage is DC5V.
Battery Built-in 3600mAH rechargeable lithium battery, can work continuously for 150 hours, or continuous
Print 1500 complete transactions. The number of recharges is 500 times.
Standard serial port 1 telephone interface, 1 RS232 interface / password keyboard interface.
Magnetic card reader supports two-way dual-track ISO2&3 manual card swiping. It can be changed to two-way dual-track ISO1&2.
Swipe card manually.
IC card reader can read and write IC cards that comply with the ISO7816 protocol.
High-speed needle printer supports 57mm wide ordinary or pressure sensitive printing paper; printing speed is 2.7 lines/sec;
When the working voltage is 5 volts, the printing life is 1.5 million lines.
LCD brightness adjustable, 16 gray scale, with EL backlight, 320×240 liquid crystal display.
Touch screen Support touch screen input.
Password keyboard Support password keyboard.
The built-in modem supports synchronous SDLC/ISO8583 protocol, asynchronous VISA1, VISA2 protocol; the baud rate is 1200/2400bps; it adopts pulse/tone dialing mode to realize remote communication.
Processor Dual CPU. The main CPU uses a 32-bit EP7312 CPU with a maximum speed of 73 MIPS; the slave CPU uses an 8-bit CPU.
The memory adopts large-capacity nonvolatile 16M byte flash memory (can be expanded to 32M, 64M, 128M storage space) and 16M byte SDRAM (can be expanded to 32M, 64M, 128M storage space), providing a hardware platform for secondary development .
GSM module Adopt Siemens MC35 module, support GPRS, short message, support industry standard AT command set.
Size 210mm×100mm×70mm
Weight (not including printing paper) 750g
(3) Safety measures
This system requires extremely high system security and stability. Security protection is mainly to prevent intentional and unintentional damage from inside and outside the system. Network security protection measures include channel encryption, source encryption, login protection, access protection, access protection, firewalls, etc. Stability means that the system can run uninterrupted for 7×24 hours, even if hardware and software failures occur, the system cannot be interrupted.
The data center can use VPN to access the mobile GPRS network through the public network. The cost of using the VPN method is relatively low. The enterprise does not need to rent a dedicated line, but can also use the original VPN equipment. The mobile terminal needs to install the function of VPN secondary virtual dialing. Software. Through the VPN method, the client must be authenticated by the Radius server before connecting to the application server. The entire data transmission process is encrypted and protected, with relatively high security, which can fully guarantee the speed and network service quality.
In addition, the data center can also use the APN access method, renting a dedicated line to access the GGSN equipment of the mobile company, which is costly, high in security, stable and reliable.
For systems with very high security requirements, consider adding a hybrid access method of VPN access in addition to the dedicated APN access to further improve the security of the system.
1. VPN virtual private network mode: VPN server is configured in the corporate internal network, and the mobile terminal loads the client software with the function of VPN secondary virtual dialing. Using VPN security technology, users are isolated from the Internet by accessing the enterprise’s internal virtual private network, and the entire data transmission process can be encrypted and protected, effectively avoiding illegal intrusion.
2. Use the uniqueness of the SIM card to authenticate and authorize the user’s SIM card mobile phone number, and bind the SIM card number and APN on the network side to delimit the range where the user can access a certain system. Only the SIM card mobile phone belonging to the designated industry The mobile terminal and data center use the special APN allocated by China Mobile for wireless network access. The SIM card number of the ordinary mobile phone cannot call the special APN.
3. For specific users, specific user IDs and passwords can be assigned through the data center. Other users who do not have user IDs and passwords assigned by the data center will not be able to log in to the system. The security of the system is further enhanced.
4. Data encryption: Encrypt and protect the entire data transmission process through VPN.
5. Network access security authentication mechanism: firewall software is used to set up network authentication and security protection functions to ensure system security.
in conclusion
After adopting the GPRS vehicle information management system, the public security traffic police only need to hold a special mobile terminal and insert the bank transportation card of the driver of the illegal vehicle into the handheld device, then they can call the relevant data of the background database to complete the inquiry and the handling of violations and fines. Improve the speed and efficiency of handling violations.
Because SG2000 series special mobile terminal adopts embedded LINUX operating system, it has good manageability and scalability, and can become a standard public security special information processing terminal system. The system can be expanded into a universal application platform for police functions. Embedded LINUX operating system, as a secondary application development platform, can facilitate various customized developments, and can further develop various police functions, such as: resident population information query, lost vehicle query, fugitive information query, public security service management, etc. Various police inquiry functions to adapt to the development trend of the combination of traffic police and patrol police in public security work.
[ad_2]
