Research And Design Of The Embedded Remote Data Acquisition System Based On ARM9 Processor

Remote monitoring and management system based on remote data acquiring has been widely used. In particular, the law enforcement authorities have greatly improved their capacity by remote video supervision. At the same time, they help to promote the technology towards digital, networking and miniaturization direction. In the thesis,we mainly focused on the work of how to design a remote data acquisition system based on ARM9. It combines the trends and current research focus of the embedded technology and remote monitoring technology, covering multiple disciplines like computer network,embedded system and video image processing. It’s an engineering design that has close connection between theory and practice, also a design with important theoretical research value and application prospects. The work is carried out based on the following aspects:(1) Design and optimization of the system hardware architecture. For the data and image acquisition, the hardware architecture needs to be optimized. In the design, we choose the Samsung’s processor S3C2440 A,adding the external control JTAG port and USB port as a processor programming interface. For the need of data collection, we add video capture port, sensors capture port and peripheral port in the hardware design. Also, we designed the communication transmission hardware interface with wire transmission and wireless transmission capabilities.(2) Analysis and design of the system software architecture. The design of software architecture is on the basis of the hardware design and system requirements. First, choose the Linux operating system, configure the U-boot for system. Then, configure and transplant the kernel. At last,configure the root file system Yaffs2.(3) Selection and design of video data collection and compression. We connect all the video devices through V4L2. The collected video data are stored in the buffer, then simply do the compression coding with the data in the buffer.(4) Implementation of socket-based network data transmission. We use the socket interface technology to achieve a connection to the serverwith the acquisition side, and build a real-time connection based on the RTP / RCTP protocol. The HTTP server finally displays the video data on the screen.By the work above, we reached the goal to display real-time video data through a browser. It built a prototype of a remote data collection system. Compared with traditional video capture system, the remote data collection system has some improvements in terms of cost, timeliness,stability and continuity.