First, the needs analysis
Transportation Management's ultimate goal is to reduce costs, improve efficiency and service level, which requires enterprises to timely, accurate, comprehensive grasp of the information transport vehicles, transport vehicles, real-time monitoring and dispatching.Modern technology, communications technology, GPS / GIS technology matures and GPRS wireless communication technology widely used for modern vehicle management provides a powerful and effective tool.GPS / GIS / GPRS optimization of enterprise resources, improve market competitiveness, will play a positive role.
General transport needs of the industry is characterized by:
- Covering wide geographical
- Number of vehicles, large amount of information
- Regional and line monitoring requirements highlighted
- Work closely with the operation control units with
- High requirements on passenger safety and security
- Flexibility on the system response to the request in a timely manner
- Need more than the demand for location services information
- Requires high degree of data sharing
- A unified information management need to improve vehicle
Second, GPRS Network Overview
GPRS is the mobile information services to solve a more perfect business, it is based on data traffic charges, covering a wide range of data transfer faster.The introduction of GPRS, for the industry and enterprise users in the wireless infrastructure business provides a platform for promoting the development of mobile office applications and created favorable conditions.Compared with the wired network, GPRS network has rented low-cost, mobile office, without geographical constraints and so on.The emergence of GPRS users in the wireless business and industry office provides a new choice.
Third, GPRS with the original transmission (GSM) comparing a moving vehicle location information transmitted to the center must rely on wireless transmission system, and now is the most extensive coverage of GSM system, so most of the car on the market today are positioning terminalGSM communication module using the carrier as a data transmission using the GSM short messaging capabilities to provide the vehicle location data transmission to the control center.Found in actual use, however, the use of short message data transmission there are two major disadvantages:
(1) transmission is slow.Under normal circumstances, the use of extended short message entity directly connected to the short message center can increase the speed of the short message transmission, the actual test results showed that the location information of vehicles, vehicle equipment sent to the center from the normal 3-5 seconds, the short message centerBusy state has not yet reached this speed.Compared with the normal speed is 60-80 km / h vehicle, the Centre received the actual error of the data may reach 80-120 meters.
(2) the high cost of transmission.SMS charges are based on number of messages sent short billing, under normal circumstances is 0.1 yuan / article, the volume of business may be appropriate for large discount, but even so the cost can not be monitored at any time to meet the practical needs of the vehicle.
For the average unit vehicle with GPS systems used in vehicle management, then both of these shortcomings may have little effect, but for demanding real-time traffic, the key moment of the location as accurately as possible the information needed to properly locate the vehicle and take the necessarymeasures.GPRS data transmission does not exist with these shortcomings.Once the GPRS communication module connected to always-on, on-line data transmission speeds when in 1 second.This means that after sending the vehicle position information center within 1 second can be displayed on the electronic map.And generally use the monthly GPRS traffic accounting system or by way of data transmission cost far less than short messages.
Fourth, the system concept
GPRS transport vehicle management scheduling system is a Global Positioning System (GPS), geographic information system (GIS), and GPRS wireless communication technology, software and hardware integrated system.Consists of three parts: the vehicle terminal (GPS device + Lenz 8713i DTU), GPRS wireless data link and control center software system.Moving vehicles can centralized management and real-time monitoring and dispatching orders.
In view of the special reliability requirements of the tourism industry, information system building in general, use of broadband fixed IP (ADSL, or DDN bind IP business) + GPRS wireless network technology to ensure network interoperability, QOS bandwidth to provide a certain guarantee, theused equipment and network architecture has good scalability, according to the needs of follow-up development, network solutions without changing the existing situation, by increasing the GPRS DTU equipment, remote wireless data transmission capability.
Fifth, the system topology
Six, the system features
- Powerful and accurate vehicle location, real-time monitoring and efficient scheduling
- Provides a standard data interface, can be achieved with enterprise management information systems, decision support systems seamless
- Can support a variety of communication methods, including the GSM short message, voice, GPRS
- Support for multi-level architecture, multi-center cascade, distributed Internet, mobile center
- The system has full security and automated disaster recovery mechanisms to ensure security and stability, reduce system maintenance costs
- Accurate digital maps and map services to support professional, with the country to the prefecture-level cities precise electronic maps
- Industry-leading high-speed 2DGIS and 3DGIS engine, especially for real-time monitoring system
Seven, the system function Introduction
The structure of Master Control Center
Total Control Center is the system control center, control center can control the center of the system for registration of any vehicle, the control center can control the permissions and so on.Master Control Center provides the entire system the only external communication interface (communication server), connect GPRS access gateways.The system control center has the only data center management and dispatching of vehicles throughout the system.
The total system control center system and the installation of vehicle equipment on the vehicle (GPS device + Lenz 8713i GPRS DTU) Communication between the vehicle location information through real-time upload, vehicle alarm, assistance, scheduling and information dissemination, remote parameter setting andMenu changes and other functions; through the center of the system electronic map-based geographic information query, information search vehicle, the vehicle trajectory save, playback and other functions.
Vehicle location information query
Automotive equipment to receive satellite information through the GPS module can provide real-time vehicle location information.The information through GPRS wireless communication terminal Lenz 8713i DTU return control center on the electronic map display, you can determine the location of the vehicle.
Real-time location
Control Center can choose to configure the vehicle equipment to arrive at a specific time or specific location via GPRS transmission equipment to send location information to the control center.Return for a specified time data is stored in the network management database, monitoring the terminal can be queried.Return data for the specified location is directly sent to the monitoring terminal.
Vehicle tracking scheduling
System established between the vehicle and system users rapid, accurate and effective information transmission channel.Users can keep track of vehicle status, quickly issued a scheduling order.Meanwhile, according to the need for remote control of the vehicle, the vehicle can also provide service information.There are several control options are available.
Monitor sensitive areas
Travel cover such a wide geographical range, anytime, anywhere within the region need to know the vehicle in various operating conditions, the implementation of the task, the task arrangements and to allow under the jurisdiction of the scope of the transport situation in front of a glance.During transport, there are some regions frequently lost money and goods, traffic accidents, transport vehicles entering the area in, you can give the vehicle tips.
Customer services
Customer needs in the transport process to keep abreast of their status, customers can get the required information in two ways, first through the system check, the second is by calling the call center calls.Two ways by which customers can access, such as vehicle location, terrain, route planning, vehicle status information.
Unified information management vehicle
Number of vehicles under the Tourism Group, the need for a centralized vehicle information management.Management covers basic vehicle information (such as license plate number, vehicle type, tonnage, color, etc.), insurance information (Pirates of the risks, natural risks, etc.), safety records, accident borrowing.System, the vehicle will be collecting all this information, input, and then provided to the user to modify, delete, and query functions.
Scheduling and information dissemination
Master Control Center with information dissemination functions.Information release can select predefined or customized information messages to all vehicles or groups of vehicles to send messages.
Track record and query traffic
Traffic information will be in the process of record keeping, to facilitate later queries.Users can select a time period in the past, query the historical data of vehicles specified time period, the echo of history, analysis.
Vehicle in the black box
Vehicle condition to provide a vehicle black box operations during the recent state of the record, the data stored in the vehicle terminal equipment, including:
(1) location records;
(2) police records;
System through the GPRS wireless network to read the black box data.Save the black box data, the time interval through the center of the actual situation can be configured.
Eight, the system effect
- The safety of passengers and drivers have a higher degree of assurance
- Corporate and visitors can take the initiative, at any time aware of the current operating state information and the whole process of destination
- Enhance the tourism enterprises and mutual trust between the customer
- Enterprises can fully understand the vehicle information, scheduling and other ways to improve the economic efficiency of enterprises and the management level
Detail driving record, and afterwards well prepared to be investigated, rectified the bad driver habits, reduce vehicle operating and maintenance costs
IX Summary
Transport vehicle scheduling management solution provides mobile communication services depends on the GPRS network technology system.With the construction of public mobile communications network, in particular, high-speed GPRS mobile communications network development for GPS applications in mobile targets has opened up broad prospects.The program can also be used in various areas of vehicle monitoring and dispatching.