Research Of Wireless Data Transmission System Based On GPRS

GPRS wireless network has the advantages that its coverage is wide,the speed of data transmission is high,the network is stable and reliable and cost is low,and besides,GPRS wireless network also has seamless connection with Internet . So it can provide well wireless data transmission channel for SCADA.How to communicate by the GPRS networks and how to introduce the GPRS network communication to practical data acquisition system will be a research of wide application prospect.In this paper,we have mainly done the following work:1.Researched and summarized the development and main characteristics of GPRS,and compared with other wireless communications detailedly.Deeply analyzed the related basic knowledge:system structure,data transmission process,protocol model and related protocol.Concluded four network building approachs used in SCADA.2.Compared the main GPRS modules on the domestic market,and chosen the GP64 module latest developed by Sony Erricsson Company,which worked as the core hardware of wireless data transmission system.Used the integrated development environment of M2mpower IDE and its rich build-in function library to compile function scripts: serial communication,GPRS initialization,TCP conversation and data transmission scripts.Concluded and summarized main points and problems which needed to be attentive in the process of compiling function scripts.3 . Researched the related knowledge of network communication and analyzed the communication process of oriented-connective stream socket.Chosen the integrated development environment of Visual C++ 6.0 as the compiled tool of communication program,mainly accomplished the serial communication program,service-item monitoring and data receiving program,network flux monitoring program.Built the experiment platform of GPRS wireless data transmission in laboratory,and gave the experimental steps specifically.Used the experiment results and the reference method to analyze the performance index of GPRS wireless transmission,and specifical proposals were given in the end.