液滴分析技术

介绍了用于液滴分析的光纤液滴分析技术、电容液滴分析技术、图像液滴分析技术、光谱液滴分析技术的原理、数学模型等.对这些技术进行了分析比较,提出了各种技术存在的问题,展望了液滴分析技术的发展前景.     

用行为分析技术来增强网络管理的能力

行为分析为网络管理员提供了一种新的技术手段,增强了网络管理的能力,其在网络管理领域的应用价值已经逐渐为人们所发现。论文对网络行为分析技术进行了介绍,分析了网络管理对行为分析的需求,并对行为分析应用于网络管理领域所能带来的优势和应用发展进行了介绍和分析,最后的结论认为,行为分析对网络管理能力的提高是显而易见的,值得对其进一步研究。     

7075铝合金疲劳寿命研究及数值模拟

本文运用有限元分析对7075铝合金板材进行了疲劳寿命数值分析,并将仿真分析结果与理论分析结果进行了对比.分析结果表明,仿真分析与理论分析重合度高,为进一步研究7075疲劳性提供了数值分析依据.     

基于时频分析的LPI雷达信号检测

本文简要分析了雷达侦察接收机的现状,提出了基于时频分析的互相关接收机框架,回顾了主要的时频分析手段,并以此为基础对LPI雷达信号检测进行了仿真,最后对仿真结果进行了分析与总结。     

小波分析及其在C3I系统中的应用

回顾了小波分析的发展,阐述了小波分析与多分辨率分析理论,总结了小波分析在C3I系统中的应用。     

装备维修信息管理与分析系统设计

结合工程应用介绍了维修信息的类型,阐述了系统在设计过程中用到的可靠性分析技术,维修性分析技术,保障设备分析技术和备件确定技术,分析了装备维修信息管理与分析系统的组成和功能,基于VC＋＋和oracle数据库技术,实现了装备维修信息的管理与分析系统,能够满足工程应用。     

热分析在印制板设计中的应用

阐述了印制板热分析得重要性,引出了热分析的概念,介绍了热分析的边界条件参数和热库模型,并对具体操作过程做了归纳和总结。     

基于Soot的Java程序竞争静态检测工具设计

设计了基于Soot字节码分析框架并实现了软件原型,利用Soot提供的Spark指向分析框架对整个程序做出指向分析,在此基础上拓展了Soot分析框架,对每个可能竞争对进行线程局部对象分析、可能并行分析、别名锁分析,数据竞争结果逐步精确.     

JPEG2000标准中ROI感兴趣区域编码的改进算法

分析了小波压缩的相关理论知识,着重对JPEG2000系统中的ROI功能进行了研究,实现了ROI的构思和实用算法,给出了性能分析,进而分析了目前ROI算法的局限性并给出了ROI的改进算法,做出了相应的实验结果分析.     

扫频式频谱分析仪测量雷达发射功率误差分析

针对雷达功率测量问题,提出了运用频谱分析仪测量发射功率的方法并对该方法进行了误差分析。首先分析了频域测量发射功率的原理性误差,推导出了理论误差系数并进行了仿真分析,然后通过分析扫频式频谱分析仪的工作原理,列出了影响频谱分析仪实际测量精度的硬件要素,研究了硬件实现中的误差系数,最后得出了该方法测量功率所得结果与实际功率的关系表达式。     

平流层通信系统的收发链路性能研究

针对平流层定点信息平台低空试验艇的工作特点,分析了该系统无线数据链路中上下行信道天线收发信号与平台运动方式的关系,分析表明现有天线结构存在传输信号盲区的问题。为此提出了一种基于天线分集的天线收发模型,以改善数据链路性能。该模型实现简单,仿真结果表明该结构可显著提高信噪比并有效消除信号传输盲区,实现信号的可靠传输。     

Proposal for spotbeam pattern for GSM-based satellite personalcommunications

A novel satellite footprint design is presented in order to mitigate the GSM synchronisation problems, caused by the potential wide variety of required timing advances, during the access phase of the signalling procedure. It is applied to LEO and MEO constellations and for different satellite channel parameters. Different approaches are presented and their tradeoff in terms of signalling load is discussed     

牛奶成份检测仪光强检测电路设计

介绍牛奶成份检测仪应用激光散透比法检测牛奶的成份,利用半导体激光器照射牛奶试样,分别在散射光和透射光方向检测光强值,由于激光透过牛奶试样后的光信号非常微弱,使得精确检测光强信号比较困难。介绍一种牛奶成份检测仪光强检测电路的设计方案,该电路具有精密、简洁、可靠性高等特点。     

Cross residual transform for lossless intra-coding for HEVC

A new lossless intra-coding method based on a cross residual transform is applied to the next generation video coding standard HEVC (High Efficiency Video Coding). HEVC includes a multi-directional spatial prediction method to reduce spatial redundancy by using neighboring pixels as a prediction for the pixels in a block of data to be encoded. In the new lossless intra-coding method, the spatial prediction is performed as pixelwise DPCM but is implemented as block-based manner by using cross residual transform on the HEVC standard. The experimental results show that the new lossless intra-coding method reduces the bit rate of approximately 8.43% in comparison with the lossless-intra coding method in the HEVC standard and the proposed method results in slightly better compression ratio than the JPEG200 lossless coding.     

Statistical processing method for sidelobe peaks for earth-station antennas

For coordination studies and for the assessment of mutual interference between radiocommunication-satellite systems and between earth stations and radio-relay stations sharing the same frequency band, the method which represents off-axis radiation characteristics of the earth-station antenna is desirable. For this purpose, International Radio Consultative Committee (CCIR) Report 391-4 describes a statistical processing method of sidelobe peaks which was adopted at the XVth Plenary Assembly in 1982. This statistical processing method is based on the slope of reference radiation pattern, while the old one, which has been used, is based on the absolute peak value. Therefore, the results of the statistical evaluation using the current (new) method may differ from that using the old method. According to the measured data on a Cassegrain antenna of 13 m in diameter at about 12 GHz, it is shown that the worst 10 percent value of sidelobe peaks of the new processing method, which is the level exceeded by 10 percent of the peaks, is statistically about 0.8 dB lower than that of the old method.     

Correcting phased arrays for multipath or for conformal topography

The theoretical basis for a calibration scheme for phasedarray antennas is presented. A modified beamforming matrix is produced that will correct for the effects of multipath propagation. An extension of this is that, since it is not necessary to know the exact disposition of the array elements, the same scheme can be used to derive beamformers for conformal arrays.     

一种鲁棒的语音信号基音标注算法

阐述了一种连续语音信号的最高振幅位的基音标注算法,该算法是在声带振动信号中找到喉部振动关闭点,并进行参数调整,从而自动完成在连续语音信号中的基音位置标注。实验证明,该算法能有效地克服以往标注算法中基音周期估计时加倍或减半的误差,从而保证了基音标注的鲁棒性。     

一种制作W波段自立式线栅极化器的新方法

设计并制作了一个W波段的极化器,设计参数为金属丝直径100 μm,间距300 μm.实测结果表明,金属丝直径和间距的均值分别为100.3 μm,300.2 μm;标准差为5.2 μm,8.3 μm,表明极化器具有较高的加工精度和良好的均匀性;同时其表面平整度优于30 μm.另外,测试了极化器的透射系数以及极化器作为可变衰减器时的透射系数,测试结果与理论计算结果具有良好的一致性,具有良好的极化性能.     

General Design for Test Guidelines for RF IC

While the cost of silicon drops over years, the IC test cost basically stays flat. Hence, the percentage of the test cost in the overall chip cost increases significantly. For the total test cost, the RF test cost is a major contributor due to its tester requirement as well as the complexity of the RF parametric and functional tests. Design for Test (DFT) is a natural step to take to reduce the overall testing cost when the cost of the silicon to implement many Built-In Self Test (BIST) is virtually negligible. This article presents general guidelines for the RF IC, especially for the System on Chip (SoC) and System in Package (SiP) parts. It discusses the specific guidelines for DFT in order to reduce the RF test cost while still keeping acceptable test quality for both RF parameters and functionalities.     

Microstrip system for voltage-controlled phase equalisation for microwaves

A group-delay reflective-mode microwave equaliser is proposed. The required delay is obtained combining several voltagecontrolled circulator-coupled elementary cells. For an assigned phase response, the circuit is designed by an interactive program. Experimental results are reported relative to L band systems with constant and linear delay.