【正文】
n Module Company has reached a highly mature level and is almost univernal. It has developed into a decisionmaking platform by management as a control system in multidirection al mining production, called Intellimine. In 1998, DISPATCH was introduced into the Dexing Copper Mine in Jiangxi, China. It has clearly enhanced the service efficiency of equipment, improved the management level in the open pits and obtained better overall benefits. In 2021, the Dandong Dongfang Measurement and Control Technology Co. Ltd.,together with the Qidashan Iron Mine have developed a dispatch management system for trucks in open pits. The system has bee indispensable to daily production management. It must be emphatically pointed out that the greatest disadvantage of these systems is that they cost too much. The major cause is that an independent munication work needs to be established and maintained by every open pit. Many mines can not afford such a system. However, using GIS/GPS/GPRS technologies, it is not necessary to establish independent munication works in every open pit. The work can be maintained and upgraded by a third party (., China Mobile Communication Co. Ltd). This can reduce costs considerably and provides a good platform for medium and small open pit mines to establish a fast, highly tive, and practical ground transportation system. Such a system is very important in enhancing labor productivity, reduce mining costs and promote mining technologies to an unprecedented level in open pits. 2 . GIS/GPS/GPRS GIS The Geographic Information System (GIS) is one kind of puter system gathering, storing, managing,analyzing, demonstrating and applying geographic information. It is a general technology that can analyze and process enormous amounts of geographic data. It takes a geographic space database as its foundat ion, uses a geographic model analysis method to provide many kinds of spatial and dynamic geographic information and serves as a geographic research and decisionmaking tool. It has some basic functions such as electronic mapping, spatial data management and spatial information analysis. GIS has been applied in many fields to establish all kinds of spatial databases and decision support systems,each with different criteria and provide answers to many different formal spatial inquiries, spatial analyses and assistance plans and decisionmaking func tions. To date, GIS has pits. The task been gradually applied in open of a monitoring dispatch information system of trucks and shovels in open pits is to track, monitor and manage production equipment,which depends largely on geographic spatial information. Therefore GIS plays an important role in visual supervisory systems of trucks, realtime dynamic management and assistance in decision analysis. GPS The Global Positioning System (GPS) is a satellitebased navigation system made up of a work of 24 satellites placed in orbit. Their ground stations are managed by the . Department of Defense. A GPS receiver must be locked on to the signal of at least three satellites to calculate a 2D position (latitude and longitude) and track movements. With four or more satellites in view, the receiver can determine the 3D position of trucks (latitude, longitude and elevation). Once the position of the truck has been dete rmined, the GPS unit can calculate other information, such as speed, bearing, track, trip distance, suprise and sunset time and more. GPS works in all weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or establishment charges to use GPS. To date, as GPS units are being smaller and less expensive, there are an expanding number of applications for GPS in open pits. With GPS, the monitor ing dispatch information system of trucks and shovels in open pits provides cua ccurate position (latitude and longitude), speed, bearing, time, track and more basic information of trucks and shovels. GPRS The General Packet Radio Service (GPRS) is one of GSMPhase2+ standard realization contents and can provide fast data transmission speed. Theoretically, this service is ten times faster than the current Circuit Switched Data services on GSM works. GPRS uses the same frequency range,bandwidth, sharpedged structure wireless modulation standard,frequencyhopping rule and TDMA frame structure as GSM. The monitoring dispatch information system of trucks and shovels in open pits largely uses the advantages of GPRS such as faster speed and instant connections as the need arises and charging by amount of data. It can provide realt ime wire less transmission and is very quick without a dialup modem connection to GPS equipment for position information. That is very important because GPS position information has room for only a small amount of data and needs to be transmitted frequently. So this system can make good use of GPRS to transmit GPS position information. 3. Principle of monitoring dispatch system of trucks and shovels Monitoring dispatch system of trucks and shovels The monitoring dispatch system is posed of mobile terminals carried by vehicles, a munication work and a monitoring center, as shown in . In this system the mobile terminals receive GPS signals and then calculate the latitude, longitude, angle, elevation and speed of the vehicles. The expansion interfaces of mobile terminals can also meet many examination and control lines to obtain the information from the vehicles. Each kind of information is transm itted to the monitoring center through GPRS and the Inter. GPRS, as a teleco mmunications work between the mobile terminals and monitoring center, mainly transmits the information on position and condition of the vehicle and information in case of an alarm, to the monitoring center, which in turn transmits dispatch and control mands to the vehides. In the monitoring center, the munication ser