【作者】 覃章健；

【导师】 郭勇；

【作者基本信息】 成都理工大学 ， 测试计量技术及仪器， 2004， 硕士

【摘要】 虚拟仪器已成为智能仪器发展的主流趋势，同时，在实际测试领域应用中，有一些数据采集过程要求有长时间、大批量的数据吞吐能力，要求数据能够实时采集实时存盘。正是基于虚拟仪器的思想和满足实时数据采集存储要求，笔者研究并设计了一套基于USB2.0的实时数据采集虚拟仪器系统。 论文从总体方案、硬件电路、软件程序、性能测试等几个方面详细地阐述了基于USB2.0的实时数据采集虚拟仪器系统的设计细节和研究成果。本采集系统采用400MHz增益带宽积的运算放大器，运用DA高精度校准技术，并选用高采样率低噪声的12位AD转换芯片进行模拟电路和AD转换电路设计，既保证了数据采集系统的信噪比，又提高了系统测量精度。通过板上集成DSP芯片，采用预测编码和字典压缩等数据压缩技术，降低了系统数据传输量。本系统运用USB2.0高速数据串行传输接口技术，实现了数据串行高速传输，满足了高数据吞吐量要求。本系统还采用集成度较高的FPGA芯片设计系统控制核心，较使用分离元器件来实现而言，降低了设计难度，提高了系统稳定性，同时还减小了设备体积。 各方面的性能测试结果表明，采集系统采样率设置在10Ksps～12Msps之间，本系统工作稳定可靠。对该课题的研究，达到了研发一套性价比高、功能强、功耗低、方便易用等特点的新一代海量数据动态记录系统的目的。更多还原

【Abstract】 Virtual instrument has shown a new tendency with the development of intelligent instrument. And in some measurement, data acquisition lasts long time and a great many data must be transferred to PC, which needs a new system to acquire data and save them in real time. So the author has studied and designed a new virtual instrument system of real-time data acquisition using USB2.0 technology, based on the new idea of virtual instrument and the demand for data acquisition in real time.The dissertation has given the designing details and the success in study, which includes general scheme, circuits, software and performance of real-time data acquisition system based USB2.0 technology. Firstly, the system has a good SNR and high accuracy, which is owed to wideband operational amplifier being used, accurate adjustment by DA, 12-bit high sampling AD converter being applied. Secondly, data transmission becomes less by using forecasting code technology and dictionary compress technology, which are run by DSP on board. Thirdly, the system can transfer data to PC at a high speed on the series interface based on USB2.0 technology, which is satisfied with the demand for a great many data transmission. In addition, control core is designed with large-scale-integrated FPGA chip, which decreases the designing complexity, enhances the system stability and lessen the instrument volume.The system has been tested, and its performance is stable and reliable. The study of it, achieves that a new type of sea data acquisition instrument has been produced with the technology all above, which has new characters of high function-price-ratio, powerful function, low power supply and easily using.更多还原