The hottest intelligent vehicle management system

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Intelligent vehicle management system

with the development of transportation, people have higher and higher requirements for vehicle management. How to effectively improve the use efficiency and strengthen the management of vehicles is becoming increasingly important in the dangerous places such as public transport, taxi, freight and business orders, which can not be pried by tools, so as to promote the vehicle management system to be intelligent gradually

structure and function of vehicle management system

intelligent vehicle management system integrates modern mobile communication technology, GPS technology and computer technology. The system consists of traffic operation center (TOC), mobile terminal and selected mobile communication network. TOC is the core of the whole intelligent vehicle system, and its function determines the design of TOC system

composition of operation center

- database system: used to store data received from multiple information sources

- user interface: This module provides executive management and control functions, such as monitoring the current status of the network, managing user accounts, etc. Obviously, the fast system response speed, refresh rate and friendly interaction decide to reduce the possibility of operation failure

- functions related to traffic management (TRF): This module performs all calculations to provide relevant traffic information for vehicles. It uses the real-time data from the data source to analyze it and uses the prediction model for traffic management

- communication subsystem: the main interface responsible for information transmission between TOC and on-board system, which is used to send information to the vehicle until the vehicle reaches the destination in the shortest time; Receive positioning information from vehicles and road congestion information from sensors such as road sensors

cdpd technology

from the current centralized mobile communication in China, CDPD (cellular digital packet data) network has certain advantages in reliability, data rate, cost and security

- the system adopts spatial diversity receiving technology and error control technology combined with FEC and ARQ, which improves the signal damage caused by attenuation and multipath effect in wireless signal transmission and improves the reliability of the system

- when the wireless terminal logs in to the system, the system needs to compare its and and Asn to determine whether it has access to the network service. Then it dynamically exchanges a pair of keys and adopts RC40 encryption to strengthen the data security on the wireless link

- each wireless terminal has an IP address, which can be easily interconnected with other communication networks (such as DDN, X.25, ISDN, etc.)

- generally, the billing is based on the data volume, and the zigzag yield strength is used to replace the zigzag strength of the link, which is more efficient, so the cost is lower

different from the previous mobile communication technology based on circuit switching, CDPD network technology adopts packet data transmission, which is especially suitable for burst data transmission, avoiding the problem that the data communication conducted by circuit switching must be connected first, resulting in a long connection time and a short actual transmission time. In fact, in the vehicle management system, both the positioning data sent by the mobile terminal to the operation center and the control instructions sent down belong to small data information

composition of mobile terminal

the wireless terminal of vehicle management system based on CDPD network transmission is composed of GPS receiver module, CDPD modem module and data processing and serial port communication module

gps system is a satellite based automatic navigation system, which provides continuous global coverage for an unlimited number of users. Users can process satellite broadcast signals after configuring the receiver

cdpd network users must obtain wireless communication access through CDPD modem. Communication with the network is realized through a interface. Its physical location can change with time, but must maintain continuous network access. Wireless resource management and mobility management can ensure that wireless devices are smoothly handoff and roaming through flame-retardant pc+abs (engineering plastic alloy) bayband terminals

implementation of intelligent vehicle management system

as a wireless IP network, CDPD can be easily interconnected with DDN, X.25, ISDN and other networks. The positioning data from the mobile terminal is transmitted to the designated server through CDPD network and other networks. In the actual vehicle management system, the traffic operation center adopts the client server architecture

server is used for positioning data acquisition and processing; The database adopts Microsoft SQL Server6.5 to store positioning data, user information, vehicle mileage statistics, etc. During operation, collect the positioning information from the mobile terminal and write it into the database, and send the message containing the positioning information to the client for real-time processing and track display; The vehicle track information for a period of time is saved in the database, so as to realize historical playback and other functions. In addition, the database also adds statistics on the times of crossing bridges and tunnels, and carries out real-time statistics by continuously analyzing the longitude and latitude of vehicles

the implementation of the client adopts the electronic map. When the client receives the positioning information forwarded from the server, it will be displayed in the electronic map according to the longitude and latitude value and dynamically updated. The client also includes a series of database processing operations, such as adding, deleting and modifying vehicle information, user information and setting user permissions. In addition, in addition to obtaining the vehicle operation status information, the operation control center can also send information to control the vehicle operation, so as to overview the entire operation status

under the control of the single chip microcomputer, the terminal sends the information from the GPS receiving module to the CDPD modem according to the preset transmission frequency, and sends it to the control center through the CDPD network. At the same time, it analyzes the instructions from the control center to determine the next work

there is a large market for applications in the field of wireless data communication. Many mobile networks originally designed for voice are also carrying out a series of additional services to support packet services, such as GPRS Technology in GSM. However, the "intelligence" level of the intelligent vehicle management system needs to be further improved. For example, it needs to be interconnected with other intelligent systems for real-time data exchange, so as to analyze the degree of road congestion to guide other vehicles to avoid in time. Now it is only a relatively independent system; CDPD has excellent applications in Wireless ATM, wireless POS, vehicle positioning and remote sensing detection. At the same time, its network coverage and frequency resources restrict its application in many aspects

application of intelligent vehicle management system

in January 2000, Shanghai Post and Telecommunications Mobile Data Communication Co., Ltd. developed a series of application projects in CDPD network. Among them, the vehicle GPS positioning system developed in cooperation with Shanghai general satellite navigation Co., Ltd. was officially launched in Pudong Bus 981 on July 22, 2000 to monitor and dispatch vehicles in real time. The system adopts global satellite positioning and navigation technology (GPS), geographic information system technology (GIS), CDPD communication technology, computer, network and other high and new technologies. Since its operation, the system has been advanced, reliable and operable

981 bus GPS system includes electronic map and management software, on-board terminal of GPS receiver CDPD modem, electronic stop board, CDPD and X.25 special line. Specifically, it is composed of a dispatching station, on-board terminals of 27 vehicles and 20 electronic station boards. The dispatching center can display all the information of the GPS system of the dispatching station and understand the operation of vehicles in real time. The dispatching station can display all vehicle location information of the route and geographic information related to the route, and has overspeed warning function. The GPS on-board unit sends location information to the dispatching center every 5S, and has the functions of receiving the command, interpretation and response from the dispatching center, as well as reporting the vehicle status to the superior. The on-board console is equipped with a voice prompt device, so the driver does not need to pay attention to the LCD frequently, and can concentrate on driving

981 electronic station boards installed along the line show the arrival time of the next train and the waiting time of passengers. In case of traffic jam, bus delay and other special circumstances in the front, the arrival time on the electronic station board will be delayed if the loading speed adjustment knob is turned slowly. Passengers can take other vehicles according to the actual situation without delaying the travel time

gps dispatching system is an important part of the intelligent public transport operation and management system. It has been widely used in Japan, Singapore, Europe and the United States and other developed countries, and has been paid more and more attention in China. At present, the integrated intelligent vehicle management system has also been used in long-distance trucks, cash charging vehicles, taxis, postal transport vehicles and dangerous goods transport vehicles

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