【作者】 刘小红；

【导师】 童子权；

【作者基本信息】 哈尔滨理工大学 ， 测试计量技术及仪器， 2005， 硕士

【摘要】 随着社会数字化程度的提高,高速数据采集在测量和控制领域中占有非常重要的地位。VXI 总线测试平台是仪器测量领域的前沿技术,可以灵活地组建自动测试系统,其模块化、速度快、可靠性高、数字吞吐能力强的特点使VXI 总线在世界范围内有着广泛的应用。本课题的研究对象是高速数据采集VXI 模块,是将数字存储示波器的核心部分—采集与控制电路集于一体,模块化,以便应用于基于VXI 总线的数字存储示波器。对于高速数据采集与处理,随着数据量的不断加大和实时处理要求的不断提高,提出了运用DSP 进行数据处理,以便提高系统的实时性和数据快速存储的能力。本文研究了双路高速数据采集VXI 模块的实现方法,综合运用了DSP、CPLD等技术。模块最高采样率达200MSa/s,具有8bit 垂直分辨率,32M 存储深度,能够实现立即触发、延时或超前触发和软件触发等多种触发模式。文中详细的讨论了前端信号调理电路、A/D 转换电路及数据存储和传输电路的设计;使用CPLD 进行了模块的控制逻辑和VXI 接口设计;阐述了随机等效采样原理及其实现电路的设计;以DSP 为核心设计了软件流程,并结合电磁兼容原理对模块进行了PCB 板设计,总结了实际工作中遇到的一些问题和解决办法。本文研究内容对PXI、PCI 高速数据采集模块、数字存储示波器及其它形式的高速数据采集的研究有较大的参考价值。更多还原

【Abstract】 As the increase of the social digital degree, the high-speed data acquisition is very important in the field of measuring and controling. The test platform based on VXIbus is the leading technology in the field of test instrument; it can easily construct the automatic testing system. VXIbus’s modularization, high speed, high reliability and high data throughput features make it widely used in the whole world. The research task of this subject is to develop high-speed data acquisition module based on the VXIbus. The acquisition and control circuits, which are the core of Digital Storage Oscillocope, are assembled on the module, and make it suitable for DSOs based on the VXIbus. For high speed data sampling and processing, with constant increasing of data quantity and constant inprovement of real-time processing request, we have proposed using DSP to carry on data processing, in order to improve systematic real-time feature and ability of the fast data store. This paper researched the way of realizing two-channel high-speed data acquisition based on VXIbus which taked advantage of DSP, CPLD and some other technology. The sampling rate of the module can up to 200MSa/s, with 8 bits vertical resolution, with 32M of storage depth, can realize several kinds of trigger mode such as instantaneous triggering, Post-trigger or Pre-trigger and software trigger.this paper discussed the designing of the circuit of modulating the front-end signal, of A/D converting and of transferring detailedly; designed the control logic of the module and the interface of VXI with CPLD; descriped electromagnetic compatibility and the circuit which realized it; the software flow is centered on DSP, designed the PCB board according to electromagnetic compatibility, and at the end of this paper, some problems, which are encountered in designing, debugging and simulating process, are presented and the solutions to them are given. The content of this paper has some important reference value for the high-speed data acquisition of PXI, PCI module, DSO and some other researchings on high-speed data acquisition.更多还原