基于NiosII的光纤捷联惯导系统数据采集模块设计

针对光纤捷联惯导系统中采用传统技术的导航计算机需重复设计且效率低的现状,提出了一种基于Nios II的光纤捷联惯导数据采集及预处理实现方案;运用verilog HDL语言完成了对光纤捷联惯导系统中挠性加速度计和光纤陀螺仪的数据采集功能IP核设计,采用SOPC(可编程片上系统)技术定制了Nios II软核处理器,并实现16阶FIR低通滤波器的设计;通过对捷联惯导系统的静态采集实验,验证了数据采集功能IP核的准确性和FIR低通滤波器滤除部分噪声的有效性。     

一种遥测数据实时采集压缩系统的实现

This paper introduces a design of variable-speed large-capacity telemetry data acquisition scheme. By using a lossless compression algorithm to improve the compression ratio、the plurality of data compression、decompression speed and compression performance of the algorithm complexity, etc. It presented a data compression core algorithm of LZW (Lempel-Ziv-Welch) and simulated the results of its execution speed and compression algorithms through software. Using master chip FPGA it completed the high-precision data acquisition compression and acquiried the systems overall compression test. After a lot ofStests,it showed thatSthe schemeScompleted a six-way real-time acquisition and compression speed varying parameters, the compression ratio is above 1.8:1 and the indicators meet the design requirements.     

基于VSLMS-Rake模型的高阶多径BOC信号捕获方法*

针对高阶多径BOC信号捕获存在模糊性的问题,提出了一种基于VSLMS-Rake模型的捕获方法。该方法首先将接收的多径BOC信号经过VSLMS-Rake模型,然后再对处理后的信号进行功率谱估计。通过二者结合,不仅可以抑制多径干扰增强信号能量,还可以减小估计误差提高捕获概率,最终实现对高阶多径BOC信号的精确捕获。理论和仿真表明,在较低信噪比下,该方法优于现有其它捕获算法。     

可微调非粘结光锥阵列耦合数字X射线探测器

光锥阵列耦合数字X射线探测器是获得大面积高分辨率数字X射线成像的重要途径,但目前通常采用粘结固定的方式实现光锥阵列各小端面与对应图像传感器芯片之间的耦合.为克服粘结耦合方式的不足,设计并实现了一种可微调的非粘结2×2光锥阵列耦合数字X射线探测器.该方案能够在调节空间受光锥阵列结构和硬件电路板尺寸限制,特别是竖直方向板间距离仅40mm的情况下,通过独特设计的水平和竖直调节机构在同一个调节层上对四块数据采集板分别进行多维度调节.利用四块数据采集板与数据传输板相互分立的特点,设计了基于ARM+4FPGA的嵌入式以太网多CMOS芯片传输数据采集系统,所实现的X射线探测器成像面积达100mm×100mm,能够完成可微调的非粘结耦合和多CMOS芯片的图像数据采集.     

激光多普勒测速实验虚拟仿真及硬件改进

针对传统激光多普勒测速实验系统中硬件采样率有限及多普勒信号自动化处理性能较弱的问题,本文开展了实验系统虚拟仿真及硬件改进.利用Unity 3D和Matlab Apps对实验内容及其信号处理方法进行了建模,通过虚拟仿真的开发,学生可更深入地了解实验系统的细节;采用LabVIEW编程和数字示波器组建了便捷的自动化高速数据采集系统,将现有实验系统硬件的采样率从50MSa/s提高至2GSa/s,并能够利用软件实现多种自动数字化处理流程,如数字滤波和自动化测量等,提升了实验系统性能,为教学内容和实验系统的设计及建设提供了参考.     

Data processing pipelines for comprehensive profiling of proteomics samples by label-free LC-MS for biomarker discovery

Label-free quantitative LC-MS profiling of complex body fluids has become an important analytical tool for biomarker and biological knowledge discovery in the past decade. Accurate processing, statistical analysis and validation of acquired data diversified by the different types of mass spectrometers, mass spectrometer parameter settings and applied sample preparation steps are essential to answer complex life science research questions and understand the molecular mechanism of disease onset and developments. This review provides insight into the main modules of label-free data processing pipelines with statistical analysis and validation and discusses recent developments. Special emphasis is devoted to quality control methods, performance assessment of complete workflows and algorithms of individual modules. Finally, the review discusses the current state and trends in high throughput data processing and analysis solutions for users with little bioinformatics knowledge.     

基于通用数据采集卡的水声应答器设计

水声应答器(Acoustic Transponder/Responder)是一类常用的水声设备,主要功能是完成水下设备的定位和导航,广泛应用在水声系统测试、目标模拟以及水声科学试验中。本文以NI公司的PCI-6052采集卡和工控机构成信号处理模块,设计出了一种可灵活配置的水声应答系统(ESRAE,Extensible Sound Responder for Acoustic Experiments),通过环境噪声电平的跟踪估计和脉冲判决技术实现了复杂海洋条件下脉冲检测、回发功能,并在海洋水声信道测量试验中得到了成功的应用。     

空间激光跟瞄中指向驱动电机运动特性研究

设计了一种深空非合作目标的激光扫描、捕获、跟踪地面实验装置,通过模拟深空同轨道运动的两颗卫星跟瞄过程,在理论上计算了跟瞄装置中光束指向驱动电机的最小加速度和其在跟踪过程中的运动特性。理论分析与仿真结果表明,当卫星偏离光斑中心一定距离时,指向驱动电机先加速后减速,补偿这个偏心,重新捕获跟踪卫星;重新捕获到跟踪所需时间受电机加速度和望远镜探测精度以及探测器响应处理时间影响,其中探测器精度对重新捕获到跟踪所需时间影响较大,探测器响应处理时间要减小到最小;为了使从捕获到跟踪过程中卫星始终在扫描光斑范围内,经纬仪驱动电机的最小角加速度为25.5°/s2。     

用电加热方法测量液氮的汽化潜热

对测量液氮汽化潜热实验进行改进,引入计算机数据采集技术,记录液氮的汽化过程,通过浸入液氮中的通电电阻释放热量,来改善汽化程度,这样既可以长时间地观察液氮的汽化过程,又能较准确的测量汽氮汽化潜热.     

Methodical developments for X-ray diffraction measurements and data analysis on lyotropic liquid crystals applied to K-soap/glycerol systems

 X-ray diffraction (XRD) data acquisition and processing software measurements on long-spacing binary systems, including adapted noise reduction algorithms, has been developed. The computation of XRD patterns has been summarized and the origin of the distinct patterns of long-spacing compounds has been illustrated with the aid of such simulations. This also provided the possibility to evaluate the retrievable amount of information used for graphical or numerical indexing programs. Numerical indexing programs were applied and limits of indexing method have been discussed. Differential scanning calorimetry (DSC) measurements and temperature-dependent XRD measurements have been carried out for the concentrations x _{KC 12} = 0.50 and 0.30 of the K-laurate/glycerol system. The analysis of the small- and wide-angle diffractograms in the various phase regions of the binary system as well as the DSC measurements provided the following results: – The creation of the lamellar phase extends over a temperature range of ΔT≈ 20 K at a concentration of x _{KC 12} = 0.50. The lamellas show a reduced degree of order. – The crystalline-to-gel phase transition is accompanied by a leap in the d values corresponding to the small-angle reflexes. Also a distinct splitting of the small-angle reflexes is observed within the gel phase. Simultaneously a rearrangement and intensity decay of the wide-angle reflexes occurs. Since some wide-angle reflexes are still present, the structure can be considered to have a partially reduced three-dimensional order. – During the creation of lamellar phases the d value decreases sharply with rising temperature. This decrease of d can be interpreted as a further decay of molecular order in the hydrocarbon chains of the K-laurate within the bilayers. – The XRD measurements correlate with the DSC data. According to our measurements a revision of the phase diagram with respect to the actual extension of the gel-phase region was necessary. Received: 3 March 1999 Accepted in revised form: 29 March 1999