Key Techniques Of Remote Digital System Experiment Platform

With the development of network technology and information technology,distance education has become popular.Especially in recent years,MOOC and SPOC have been large-scale promotion.So the problem of difficult to practice in remote educational become more and more prominent.Remote experimental system gradually become a research focus of universities and research institutions.The existing remote digital system experiment platform mainly uses the computer as the carrier system architecture.There are high cost,large size and other defects.In order to solve these problems,this thesis put forward a kind of new remote experiment system architecture based on embedded system.All the server which include Web server,the experimental server and video server are designed in the embedded system.It can achieve the purpose of the remote experiment system miniaturization and low cost.It also facilitates integration in experiment equipment.It implements the intelligent of the experimental equipment.Compared with the computer,the process of a embedded system is weak.To complete the design,we needs three key techniques.In the embedded system,we must achieve the optimal task scheduling algorithm,real-time video collection and transmission,and remote configuration of FPGA based on embedded system.In allusion to the task scheduling algorithm of the experimental system,this thesis studies the architecture and theoretical model of the Web server system based on cluster technology in computer network.We compare the analysis of several Web server common task scheduling algorithm.Aiming at the particularity of the embedded system,we use the queuing theory to model the task scheduling in the remote experiment system.We use optimization multi-class round robin(MC-RR)based on content distribution to meet the requirement of load balancing and real-time in embedded remote experiment system.As for the real-time collection and transmission of video,this thesis studies the realization scheme of video collection and transmission in embedded system in detail.V4L2 drive frame is used.It control UVC camera for video image collection.TCP/IP Socket programming is used.It realizes the real-time video collection and transmission.We can watch on the browser.For the remote configuration of FPGA based on embedded system,this thesis studies the remote configuration scheme of FPGA by using ARM.Jam STAPL is used.Jam Player is transplanted to the embedded system.In the embedded platform,it realizes the JTAG configuration of FPGA.Research on some key techniques shows that the new remote experimental architecture based on embedded system can meet the needs of remote digital system experimental platform.It also can realizes the intelligentization of equipment,and reduces the cost of remote experiment system.