Discussion on multimedia remote mine output monito

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Brief discussion on multimedia remote mine output monitoring system and its application prospect

Abstract: in view of the problems existing in mine mining, such as scattered mines, far away from headquarters, difficult mine output measurement and monitoring management, and lagging weighing data transmission, this paper proposes to use 3G wireless communication technology in the electronic weighing system to build a multimedia remote mine output monitoring system based on GPRS. The system can realize the real-time monitoring of the mine output of remote production. It not only improves the work efficiency, but also improves the work quality. At the same time, because the use of this system can save network resources, reduce costs, simple system transformation and maintenance, and does not affect the normal use of electronic weighing instruments, it has good promotion value

key words: GPRS multimedia remote mine output monitoring system

1. Introduction

in the mining of mines, there are widespread scattered production mines, far away from the headquarters, which bring great difficulties to the measurement and management of mine output and the timely transmission of weighing data, together with Aramco, a Saudi oil giant. The multimedia remote mine output monitoring system based on GPRS can realize the real-time monitoring of remote mine output weighing and measurement. Through GPRS, the output measurement of the remote production mine is transmitted to the headquarters monitoring center in the form of pictures and data in real time for the headquarters leaders and relevant departments to inquire. At the same time, the monitoring center can also issue instructions to the weighing station of the remote mine through GPRS. In addition, the system can also realize the functions of unattended weighing room and automatic transmission of weighing data. Because the system uses wireless resources, is not affected by geographical environment, saves wired network resources, reduces costs, and has simple system transformation and maintenance, which does not affect the normal use of electronic weighing instruments, it has good promotion value

2. GPRS overview

gprs is a fashionable wireless communication method. With this method, the real-time seamless connection of equipment can be achieved. GPRS is the full English name of general packet radio service, which means general packet radio service in Chinese. It is a set of wireless transmission mode developed by using the concept of "packet switched". The so-called packet exchange is to package the date into many independent packets, and then transmit these packets one by one, which is a little similar to sending packages in form. The advantage of packet exchange is that the channel will be occupied only when there is data to be transmitted, and it will also be priced according to the amount of data transmitted. This is a more reasonable billing method for users, because most of the time channels of data transmission such as the Internet are idle. In addition, GPRS is based on GSM network. In the GSM phase 2 standard, GPRS can provide four different coding methods, and these coding methods also have the ability to provide different error protection. Using four different coding methods, each time slot can provide transmission rates of CS-1 (9.05k), CS-2 (13.4k), CS-3 (15.6k) and CS-4 (21.4k), of which CS-1 is the most tightly protected and CS-4 is completely unprotected. Each user can use up to eight time slots at the same time, so GPRS claims that the maximum transmission rate is 171.2k

gprs can quickly access the data network. It realizes the "forever" connection between the mobile terminal and the network, and the network channel is occupied only when it is actually transmitted. The actual speed of GPRS is typically slower than the theoretical speed, ranging from 14.4 to 43.2 Kbps (uplink and downlink asymmetric rate). GPRS will be the first standard to realize instant access to mobile Internet, and it is also a process towards 3g/umts

in theory, the cost of GPRS packet communication service is less than that of circuit switching service. Its communication channel is shared, and packet transmission is generated only when needed. Therefore, it saves a lot of resources than using a dedicated connection. GPRS mobile users can access their own virtual private network (VPN) at any time, instead of dialing up every time, so as to provide users with simpler application services. Therefore, using mobile GPRS Technology for network data transmission has the advantages of low cost, convenient use, no geographical restrictions, convenient business development, and has a good development trend. From SMS to GPRS and then to 3G in the future, it is a more economical and convenient way of communication, which can build a broader communication network and realize flexible information network transmission

due to the use of "grouping" technology, users can avoid the pain of disconnection (the situation is probably similar to using the download software NetAnts). In addition, the method of using GPRS is different from that of WAP. Using WAP is like using it at home. You can "dial up" first, and then you can't use the line at the same time, but GPRS is superior. Downloading data and calling can be carried out at the same time. Technically speaking, voice transmission (i.e. call) continues to use GSM, while data transmission can use GPRS. In this way, mobile applications can be upgraded to a higher level, and the development of GPRS technology is also very "economic", because it only needs to use the existing GSM network to develop. GPRS is widely used, including sending and receiving e-mail, browsing on the Internet, etc

The characteristics of GPRS data transmission are mainly shown in the following five aspects: first, compared with the circuit switched data transmission mode of GSM dial-up mode, GPRS is a packet switching technology, which has the advantages of "high speed" and ""; 2、 In addition to the speed advantage, GPRS has the "" feature, that is, users keep in touch with the network at any time. When there is data transmission, it sends and receives data on the wireless channel. Without data transmission, the terminal enters a "quasi sleep" state and releases the used wireless channel to other users. At this time, a logical connection is maintained between the network and users. When users transmit again, they immediately request the wireless channel to transmit data without frequent dialing; 3、 GPRS data transmission is bidirectional and can transmit batch data. For mine weighing, it can also realize wireless downloading of solid-state storage data. This feature can not be replaced by ultrashort wave, GSM SMS, PSTN and satellite communication; 4、 GPRS is based on data packet transmission, which can provide continuous data communication services, has better data transmission speed and ability than SMS, and can always be used. The communication cost is settled according to the actual transmitted data bytes, and the operation cost is low; 5、 GPRS has a wide range of services, which can be used in mobile commerce, mobile information services, mobile Internet and multimedia services

3. Composition of the system

the multimedia remote mine output monitoring system based on GPRS is a modern information weighing system integrating modern electronic weighing technology, computer network technology, remote digital video technology, gprs/cdma wireless network transmission technology. It is mainly composed of digital electronic weighing system, video monitoring system, remote monitoring terminal, data server, computer application software and GPRS. The system block diagram is shown in the figure below

Figure block diagram of remote multimedia production monitoring system based on GPRS

3.1 digital electronic weighing system

digital electronic weighing system is mainly composed of weighing sensor, weighing control display and printer, which is used to weigh and measure the mine output, display, print and store the weighing data, and transmit it to the remote data terminal through RS232 and RS485 interfaces

3.2 video monitoring system

the video monitoring system is mainly composed of cameras and other components, which can monitor the weighing process of mine output in real time, and store the captured image information into the data server through the remote video terminal for enterprise leaders and relevant departments to inquire

3.3 remote monitoring terminal

the remote monitoring terminal is mainly composed of a data transmission module and a video transmission module, which transmits electronic weighing data and video images to the central server in real time through GPRS wireless transmission for future query. GPRS terminal adopts GPRS wireless dtu/gprs module gf-2008w which conforms to industrial application standard. The communication module is a wireless data transmission protocol converter specially developed for wireless data transmission equipment. It realizes the conversion of the wireless GSM protocol stack. The terminal equipment connected with it does not need to support the GMS protocol processing ability. During data transmission, it only needs to send serial port format data to dtu/gprs through the serial port. Dtu/gprs will automatically add the GSM wireless communication protocol, convert the serial port data packet into the GSM wireless communication protocol data packet, and transmit the data to the destination host; At the same time, the data sent by the other host through wireless GSM is also transmitted back to the central station host in the form of transparent serial port data after being converted through dtu/gprs protocol. As long as the equipment providing RS-232 interface can realize wireless GSM data transmission through dtu/gprs. The interaction between terminal equipment and dtu/gprs adopts simple serial port packet format, and all GSM protocol stack protocols are converted by dtu/gprs. The wireless data transmission function is realized through dtu/gprs

3.4 data server and application software

the data server of the monitoring center is mainly used to store the data and image information transmitted from the remote monitoring terminal for the query of relevant personnel. Application software provides technical support for the transmission, storage, query and update of multimedia data

4. GPRS access

after the user applies for a GPRS private VPN, according to the fixed IP address assigned to the data center modem by the mobile operator, the data center realizes multi-point to center data communication with the weighing station through the wireless gprs modem, and the remote weighing station establishes a data channel with the data center according to the configured IP address in the data center. The advantages of this access method are: first, the data is communicated in its own VPN, and the external terminals or nodes cannot enter, so the data security is good; 2、 Data is communicated in its own VPN, which also ensures the real-time performance of data transmission; 3、 The access cost is only one third of the DDN dedicated line access. The cost is reduced, the flexibility is improved, and civil construction is not required; 4、 With a bandwidth of 40-80k, the communication performance can meet the requirements of weighing data transmission; 5、 The central access point or weighing station can be bound with internal fixed IP. If the line drops occasionally, it can continue to go online automatically without losing the address of the central end

5. GPRS communication method

set the I to be connected to the remote computer on the weighing field GPRS module, which has the advantages of stable operation, high reliability, simple protection, wide range of application, and other parameters such as P and port. The micro invasive peek guide tail (aiming rod) selects the transparent data transmission mode, and then install the server software on the remote computer, set the IP and port, and use Winsock dynamic array connection. After completing the above work, you can use the ASP page to operate the database on the server side, and then the server will forward it to the field device when it receives the computer command on the Internet to operate the field device. GPRS communication can transmit a large amount of data, and can carry out operations such as data up transmission and command down transmission

5.1 data upload

each mine output weighing station collects weighing and video data, and sends them to the GPRS module through data conversion and data packaging. The GPRS module adds some redundancy codes and check codes to the packed data according to the APN connection mode defined by the implementation, and converts them into network data packet signals suitable for transmission on the wireless link. After receiving the signal, the special APN at the mobile center end is transparently transmitted to the company's monitoring center

5.2 command download

similarly, due to transparent transmission, the headquarters monitoring center can set commands and remote weighing stations

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