基于C#和SQL Server的信号接收机自动校准系统软件设计与实现

为保证信号接收数据的准确性,提高测试校准工作的自动化水平,本文基于C#与SQL Server对信号接收机自动校准系统软件进行了设计。基于多线程设计系统程序,提高了测试校准效率;基于双缓存技术绘制测试数据波形,解决了波形显示闪屏的问题;采用SQL Server数据库存储测试数据和仪器控制指令,实现高效数据存储和管理;运用测试报告自动生成技术实现校准证书和原始记录的自动生成。该自动校准系统设计对提高信号接收机校准工作效率,增强设备计量保障能力具有较强的应用价值。     

动态信号分析系统自动化校准方法研究

实现动态信号分析系统的自动化校准,需要分析处理的数据量极大,消耗计算机系统资源大且处理时间长。采用Lab View设计了一套自动化校准软件,可以有效缩短数据处理长度,提高处理速度。该软件分为数据采集模块和数据分析模块,被检动态信号分析系统连续采集标准信号源所发的信号,将采集数据保存为文本文件或电子表格文件,通过LAN将其载入数据分析模块。数据分析模块查找各校准点的初始有效索引,提取有效的校准数据段,然后采用逐段分析方法处理数据。将实验测试结果与采用常规方法的测试结果对比,该方法可以正确计算其频谱幅值线性误差、频谱幅值示值误差和幅频特性等参数,且需要的时间缩短为常规方法的40%,实现了动态信号分析系统的自动化校准。     

科技动态

NI发布高速数据采集设备PXI-5114美国国家仪器公司(NI)推出PXI-5114双通道、8位数字化仪(也称为基于PC的示波器),用于高速验证和生产测试应用,例如消费电子测试和半导体元件测试等。NI PXI-5114数字化仪提供250MS/s实时和5 GS/s等值时间或任意隔行扫描采样,以及用于多功能时域数字化的125 MHz带宽。可以使用该模块高达256 MB/通道的板载内存存储较大的波形,或在使用多记录采集模式下存储大于100万条的记录。PXI-5114基于NI同步和存储核心(SMC,synchronization and memory core)架构,该架构是NI数字化仪、信号发生器和数字波形…     

基于VB6.0的函数信号发生器自动检定/校准系统的开发

详细介绍了基于VB6.0的函数信号发生器自动检定/校准测试系统的组成及工作原理、测控软件的开发设计、测控程序主要功能的实施。重点介绍了测控软件的编程语言设计、测控软件构成、测控软件主要功能模块、测控模块程序流程图。其开发过程不仅适用于函数信号发生器自动检定/校准系统的开发,还可适用于其他专业的自动测试系统的开发。     

相干采样在混合信号模块校准中的应用

文章介绍了混合信号测试中采样和重构的原理,针对相干采样技术进行了深入的研究,分析了采样周期、采样点、相干频率和采样频率的关系。同时以ASL3000集成电路测试系统为背景,利用相干采样理论建立、产生重构信号,实现了对集成电路测试系统任意波形发生器的精确校准。校准结果表明,该校准装置及校准方法能够满足集成电路测试系统任意波形发生器的校准要求。     

基于MET/CAL的数字示波器自动校准系统

福禄克公司旗下自动测试软件平台MET/CAL是一款集资产管理、编辑校准程序及运行校准程序于一体的功能强大的自动化测试平台,为了充分应用该平台、编制符合实验室要求及操作步骤的示波器自动测试程序,开发了基于MET/CAL的数字示波器的自动校准系统。主要介绍了MET/CAL平台以及功能选择代码(Functional Select Code, FSC),阐述了系统硬件的搭建与构成以及系统软件的开发要点,软件部分重点介绍了仪器识别模块、系统设置模块、测试项目选择模块、校准过程模块的编制和实现方法。最终通过自动测试结果与手动测试结果的比对验证了系统的准确性和可靠性,证明该系统完全满足预期使用要求。     

NI发布其速度最快的数据采集设备PX-5114

全新250 MS/s数字化仪/基于PC的示波器 丰富了NI的数字化仪产品系列 工程师们现在可以使用NI公司全新的PX- Ⅰ-5114双通道、8位数字化仪(也称为基于PC的 示波器),用于诸多高速验证和生产测试应用,例 如消费电子测试和半导体元件测试等,为用户带 来高性价比的产品和服务。 NI PXI-5114数字化仪提供250 MS/s实时 和5 Gs/s等值时间或任意隔行扫描采样,以及 用于多功能时域数字化的125 MHz带宽。工程 师们现在可以使用该模块高达256 MB/每通道 的板载内存来存储较大的波形,或在使用多记录 采集模式下存储大于100万条的记录。该数 字化…     

车用电线束插接器动态阻抗测试系统

针对车用电线束插接器测试中全程记录动态阻抗数据的要求,构建了一个基于PXI Express(PXIe)的车用电线束插接器动态阻抗测试系统.系统硬件由PXIe机箱(含双核嵌入式控制器)、PXIe高速数字化仪、函数波形发生器模块、高精度电流源等组成.系统界面由LabVIEW设计,测试结果直观地显示在显示器上.系统实时监控线束端子振动试验期间的接触电阻变化并能完整记录、显示波形和打印;监控电阻采样率可达100M/S,采样时间0.01us;在最高实时采样速度和采样点下.至少保证3小时的测试数据和记录;设备具有判定,报警及统计功能.     

基于SOPC的多通道信号产生模块控制器的设计

通过并行测试技术硬件实现方式和软件实现方式的分析,为了降低并行测试过程中任务分解和任务调度的难度,建立了基于FPGA的并行多通道信号产生模型,采用SOPC技术设计并实现了具有专用资源架构特点的并行多通道信号产生模块;模块通过增加支持并行测试的多通道激励,可以同时产生多路激励信号,并可以控制激励信号波形的类型及频率,降低了并行测试过程中任务分解和任务调度的难度,支持并行测试系统的实现与传统自动测试系统的并行测试升级改造.     

CPR1000核电站数字化仪控系统常规岛I/O通道自动测试工具的应用

本文主要阐述了在CPR1000核电站数字化仪控系统常规岛核电站单体测试中,I/O模块通道测试的新方法和与之配套的新工具。这些方法和工具大大提高了I/O模块通道测试的效率和质量,并填补了国产化核电DCS系统在I/O通道自动测试技术的空白。     

A method for the calibration of a 3-D laser scanner

The calibration of a three-dimensional digitizer is a very important issue to take into consideration that good quality, reliability, accuracy and high repeatability are the features which a good digitizer is expected to have. The aim of this paper is to propose a new method for the calibration of a 3-D laser scanner, mainly for robotic applications. The acquisition system consists of a laser emitter and a webcam with fixed relative positions. In addition, a cylindrical lens is provided with the laser housing so that it is capable to project a plane light. An optical filter was also used in order to segment the laser stripe from the rest of the scene. For the calibration procedure it was used a digital micrometer that move a target with known dimensions. The calibration method is based on the modeling of the geometrical relationship between the 3-D coordinates of the laser stripe on the target and its digital coordinates in the image plane. By this method it is possible to calibrate the intrinsic parameters of the video system, the position of the image plane and the laser plane in a given frame, all in the same time.     

数字集成电路测试系统测试结构及校准原理分析

文章介绍了数字集成电路测试系统的测试结构,分析了测试过程中各部分的工作原理,说明了测试的实现过程。在此基础上,提出了测试结构中各部分的校准原理与实现方法。     

基于PXI Express总线的多通道数字化仪软件技术研究

针对各种数字化设备高采样率和高分辨率的测试需求,设计一种基于PXI Express总线的多通道数字化仪。该数字化仪开放性高,灵活性好,模块化强,广泛应用于测控领域中。结合数字化仪开发过程中所面临的关键问题及解决方案,重点从设备驱动程序、接口封装和应用软件三个方面进行分析阐述。首先,深入研究了KMDF设备驱动开发过程中几个关键问题,如配置空间访问、中断处理、DMA数据传输等的运行机制及实现方法;然后,以数字化仪应用需求为背景,阐述了采用.Net平台下三层体系架构的软件总体设计;最后,大量实验测试和结果分析表明,该数字化仪具有较强的可靠性和稳定性,达到预期技术要求和性能指标。     

Automatic testing of MMIC wafers

Microwave probes are used extensively for linear and nonlinear characterization of microwave devices on wafer and are commercially available for use at frequencies up to 65 GHz. An on-wafer noise measurement test system, for discrete devices, is now commercially available and on-wafer power measurement techniques are emerging slowly. These probes are also getting more recognition for the testing of packaged chips, packages, and modules. More accurate calibration techniques and their on-wafer validation are being developed. Automatic testing of MMIC wafers, using an integrated test system, is a key requirement for the development of low-cost IC production.     

集成电路综合自动测试系统硬件平台设计

针对当前国内集成电路产业快速发展的现状,通过分析集成电路测试需求,研制了国产超大规模集成电路综合自动测试系统硬件平台。首先设计了基于PXIe总线的硬件平台总体架构方案,其次研制了包含数字测试模块等高性能PXIe测试仪器,进一步构建了测试头等分系统并完成系统集成。采用高性能外部仪器和自检校准分系统,对硬件平台进行了指标测试。基于BM3110MPB开展了测试验证。验证结果表明,硬件平台数字测试单通道最高测试速率为1600Mbps、DPS可实现最大输出电压12V、最大输出电流800mA,具备连接性测试、功能测试、直流参数与交流参数测试等功能。该硬件平台未来可有效满足国产超大规模集成电路测试需要。     

基于PXI总线的高速数字化仪研制

针对现代自动测试领域对数字化仪测试需求,设计并开发了一种PXI总线高速数字化仪;详细介绍了PXI接口电路设计方法,以及使用FPGA作为本地控制器,完成高速数据转换和异步FIFO数据缓存;采用驱动程序开发工具Windriver,在Visual C++6.0平台下完成模块驱动程序的开发,采用中断方式启动数据传输,利用PCI9054芯片的DMA数据传输功能,实现了数据高速传输,单通道最大采样速度为40MHz,输入电压范围-10～+10V;结果表明,设计的PXI高速数字化仪基本达到预定的技术指标,运行稳定可靠。     

Cost-effective reflectance calibration method for small UAV images

ABSTRACT

We introduce a cost-effective reflectance calibration method for small unmanned aerial vehicle (sUAV) images using ethylene-vinyl acetate (EVA) greyscale reference panels. The goal is to test if such light-weight and low-cost panels can provide sufficient calibration accuracy to support UAV survey projects. The universal calibration equations to convert red-green-blue (RGB) digital number (DN) values of UAV images to surface reflectance values were constructed based on the relationship between RGB values measured by a colour digitizer and surface reflectance values measured by a spectrometer. We compared the calibration results for UAV ortho-mosaic images acquired at three different illumination conditions in late autumn to the results derived from high-cost commercial panels. The comparison showed high degree of agreement between our method using the EVA panels with the traditional methods using the commercial panels. The Mann–Whitney U test verified our method was statistically more significant at all illumination conditions tests. In addition, the calibration results applied for two different sensors and three different flight altitudes acquired in early summer were satisfactory. This method is transferable to various illumination conditions and flight altitudes as long as the effects of shades and the bidirectional reflectance distribution function (BRDF) are minimal. We expect our research could expedite sUAV image calibration by lowering its cost and levelling its availability.     

A system on programmable chip design of a digitizer with improved trapezoidal filter validation

This paper presents a System on Programmable Chip (SoPC) design of a digitizer to determine particle features in nuclear physics covering arrival time and energy also for pileup events. The preamplified pulses from the radiation detector are digitized with a rate of 125 Ms/s. Pulse triggering and arrival time is measured by analysis of the pulse output after CR-RC filtering. Trapezoidal pulse shaping is applied for pulse-height energy measure and noise suppression. A new method is presented for trapezoidal flat top height analysis to ease calibration of the trapezoidal pulse shaping filter. The presented method also improves pulse analysis in terms of pileup identification and false pulse rejection. Experimental results obtain a repetitive pulse rate of 50 kHz. The digitizer is able to detect pileup events with a delay between pulses down to few micro seconds.     

A real-time digitizer for stereo image processing

This paper discusses the design and implementation of a stereo image digitizer for use in digital image processing applications. The system operates in real time with respect to the standard television refresh rate and it possesses several signal sampling, routing, and transformation options which can be controlled from an external digital computer. Results obtained with a prototype unit are illustrated and compared using precision test patterns and natural scenes.