Application of the hottest GPRS Technology in sate

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Application of GPRS Technology in satellite transmitter monitoring

I. background

a company engaged in satellite communication services wants to set up a remote monitoring network in one (Master) to many (slave) mode through Beijing Kunlun Tongshi MCGS configuration software, which is used for the special material certification of domestic material suppliers. However, continuous efforts and improvements are needed to monitor the working condition of the satellite transmitter shaft under the transmitter. The signals of each transmitter are collected through the Kanto board card, and the Advantech industrial computer is used as the slave station. The software adopts MCGS general version (embedded version), and a server with fixed IP is used as the master station. The software adopts MCGS network version. The slave station uses jiafuxin gf-2000w wireless gprs modem to dial up and communicate with the master station connected to the Internet through GPRS network and transmit data

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as shown in the above figure, the slave station can establish a tcp/ip link with the master station for data transmission at any time through MCGS and jiafuxin gf-2000w wireless gprs modem dialing, and transmit the real-time data or historical data detected by itself to the master station. The master station can also send commands to modify the value of MCGS variables on the slave station through this tcp/ip link, so as to achieve the function of simple control of field equipment.

for GPRS network, interconnection, TC The driver in MCGS software has handled the abnormal conditions such as tcp/ip link interruption, communication timeout, network connection interruption, etc. in the process of data communication of p/ip link. The abnormal interrupted data communication can be automatically restored to the normal communication condition

II. Introduction to GPRS

gprs is the English abbreviation of general packet radio service. It is a new bearer service developed on the existing GSM system, and its purpose is to provide GSM users with packet data services. GPRS adopts the same wireless modulation standard, the same frequency band, the same burst structure, the same frequency hopping rules and the same TDMA frame structure as GSM. This new packet data channel is very similar to the current voice service channel switched by circuit 0.41 ~ 0.45. Therefore, the existing base station subsystem (BSS) can provide comprehensive GPRS coverage from the beginning. GPRS allows users to send and receive data in end-to-end packet transfer mode without using the network resources of circuit switching mode. Thus, it provides an efficient and low-cost wireless packet data service. It is especially suitable for intermittent, sudden, frequent and small amount of data transmission, as well as occasional large amount of data transmission. The theoretical bandwidth of GPRS can reach 171.2kb/s, and the actual application bandwidth is about 10~70kb/s. Tcp/ip connection is provided on this channel, which can be used for Internet connection, data transmission and other applications

gprs is a new mobile data communication service, which provides a connection between mobile users and data networks, and provides high-speed wireless IP for mobile users. GPRS adopts packet switching technology. Each user can occupy multiple wireless channels at the same time, and the same wireless channel can be shared by multiple users. Resources are effectively used, and the data transmission rate is as high as 160kbps. GPRS technology is used to realize the sending and receiving of data packets, and users are always billed by traffic, which quickly reduces the service cost. GPRS mobile data transmission system has a wide range of applications measured by viscometer. Almost all low and medium speed data transmission services can be applied, such as urban power distribution network automation, tap water, gas pipeline automation, commercial POS machines, Internet access, personal information, stock information, finance, transportation, public security, etc

III. scheme selection

after comparative analysis, GPRS system of China Mobile is selected as the data communication platform of satellite transmitter monitoring system. At present, after years of construction by the telecommunications department, the GSM network has expanded its coverage and has become a mature, stable and reliable communication network, especially the GPRS data service newly launched by China Mobile. Gsm/gprs system can provide wide area wireless IP connection. Building a satellite transmitter monitoring system on the GPRS service platform of the mobile communication company to realize the wireless data transmission of the monitoring point has the advantages of making full use of the existing network, shortening the construction cycle and reducing the construction cost, and the equipment is easy to install and maintain

gprs wireless monitoring system has the following characteristics:

1. Good real-time response and processing ability. Compared with short message service, GPRS has real-time characteristics, and the system has no time delay. The system can receive and process various data of multiple/all monitoring points in real time at the same time. It can synchronize the clock of monitoring points without round robin, which can well meet the requirements of the system for real-time data acquisition and transmission

2. Remote instrument and equipment control: due to the use of GPRS two-way transmission system, the monitoring center can reverse the time correction, status report, switch and other monitoring and control functions of instruments and equipment

3. Low construction cost: the existing GSM network can be fully used, and the equipment can be connected immediately after installation. When using ultrashort wave communication, the on-site environment needs to be fully considered, and the antenna iron frame and other auxiliary equipment need to be equipped

4. Simple installation and debugging, short construction cycle: using the existing mature GSM network, the system basically does not need debugging when it is put into operation, and the installation is simple. When ultrashort wave communication is adopted, the installation and commissioning workload is large, so the on-site signal test, antenna iron frame erection, antenna direction angle commissioning and other work should be carried out first

IV. system features

1, wide coverage. The construction of satellite transmitter monitoring system requires a wide range of data communication coverage, unlimited capacity expansion and unlimited access locations, which can meet the access needs of mountains, towns and cross regions

due to the large number of pipe monitoring points, pipe monitoring points are distributed in a wide range in remote areas, and the geographical location is scattered. Ultra short wave communication mode is adopted, and the coverage is only more than 30 kilometers; With GPRS mode, monitoring can be realized theoretically within the coverage of wireless gsm/gprs network

2. High data transmission rate. GPRS network transmission rate can reach 171.2kbit/s in theory, and the data transmission rate in practical application is about 40kbps. At present, the transmission rate of general ultrashort wave data transmission stations is mostly 2.4kbit/s or lower

3. The transmission capacity of the system is large. The monitoring center station should cooperate with each

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