一种S波段T/R组件的设计与制造

介绍了一种S波段高功率高精度双通道T/R组件的技术要点和研制结果。从生产调试和使用的基本情况可以看出,该T/R组件具有输出功率高,功率密度大,控制精度准确,一致性好,调试工作量小,适合批量生产等特点。     

光电有源干扰技术与系统

本文介绍了各类激光有源干扰设备的工作原理和特点,简要分析了某些设备的改进方法.最后讨论了激光有源干扰设备的现状及未来的发展趋势.     

基于高性能数字信号处理器的供电模块设计

在由高性能数字信号处理器构建的系统中,供电模块的设计是很重要的一个部分。以ADSP-TS101为例,对应用电源芯片TPS54312和TPS54616设计出符合要求的供电模块进行了详细介绍。首先对3种供电方式进行了对比和原理上的介绍,然后介绍了这两款芯片的性能,并详细介绍了如何利用这两款芯片进行原理图的设计以满足功耗、上电次序等设计要求,同时利用TI电源设计辅助软件swift designer进行分析和仿真。经实验,设计完全符合系统供电要求。     

利用CNSP算法提高米波雷达方位角分辨率

利用常规波束形成构造噪声子空间投影(CNSP)可以提高子空间类DOA估计算法的分辨率。文中对算法的性能进行了进一步的分析,讨论了利用CNSP算法提高米波雷达方位角分辨率的方法,并利用米波雷达的实验数据进行了验证,分析结果表明CNSP算法可以提高米波雷达的方位角分辨率。     

基于蚁群算法的InSAR相位解缠算法

该文利用数字地面高程(DEM)数据的变更,由SAR成像机理和双尺度粗糙面散射计算构造得到多景具不同阴影的单视复数(SLC)SAR影像数据。提出一种基于蚁群算法的相位解缠算法,用于多景具不同残差点数量的仿真相干SLC相干图像以及欧洲环境卫星(ENVISAT-ASAR)的InSAR图像的相位解缠,并与其他现有的解缠方法作比较。结果表明：该算法是一种有效的相位解缠方法,解缠精度与解缠速度上要优于其他一些常用的解缠方法。     

Turbo乘积码对星间光通信链路的性能改善分析

通过联合界技术较为详细地给出了Turbo乘积码的最大似然译码限,并比较了在星间光通信链路中Turbo乘积码和Turbo卷积码及传统级联码的纠错性能.研究表明,Turbo乘积码的纠错性能优于传统级联码以及Turbo卷积码.     

PbS and CdS Quantum Dot‐Sensitized Solid‐State Solar Cells: “Old Concepts,New Results”

Lead sulfide (PbS) and cadmium sulfide (CdS) quantum dots (QDs) are prepared over mesoporous TiO₂ films by a successive ionic layer adsorption and reaction (SILAR) process. These QDs are exploited as a sensitizer in solid‐state solar cells with 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) as a hole conductor. High‐resolution transmission electron microscopy (TEM) images reveal that PbS QDs of around 3 nm in size are distributed homogeneously over the TiO₂ surface and are well separated from each other if prepared under common SILAR deposition conditions. The pore size of the TiO₂ films and the deposition medium are found to be very critical in determining the overall performance of the solid‐state QD cells. By incorporating promising inorganic QDs (PbS) and an organic hole conductor spiro‐OMeTAD into the solid‐state cells, it is possible to attain an efficiency of over 1% for PbS‐sensitized solid‐state cells after some optimizations. The optimized deposition cycle of the SILAR process for PbS QDs has also been confirmed by transient spectroscopic studies on the hole generation of spiro‐OMeTAD. In addition, it is established that the PbS QD layer plays a role in mediating the interfacial recombination between the spiro‐OMeTAD⁺ cation and the TiO₂ conduction band electron, and that the lifetime of these species can change by around 2 orders of magnitude by varying the number of SILAR cycles used. When a near infrared (NIR)‐absorbing zinc carboxyphthalocyanine dye (TT1) is added on top of the PbS‐sensitized electrode to obtain a panchromatic response, two signals from each component are observed, which results in an improved efficiency. In particular, when a CdS‐sensitized electrode is first prepared, and then co‐sensitized with a squarine dye (SQ1), the resulting color change is clearly an addition of each component and the overall efficiencies are also added in a more synergistic way than those in PbS/TT1‐modified cells because of favorable charge‐transfer energetics.     

Small molecule interlayer for solution processed phosphorescent organic light emitting device

Using a 4,4′,4′′-tris(N-carbazolyl)-triphenylamine (TCTA) small molecule interlayer, we have fabricated efficient green phosphorescent organic light emitting devices by solution process. Significantly a low driving voltage of 3.0 V to reach a luminance of 1000 cd/m² is reported in this device. The maximum current and power efficiency values of 27.2 cd/A and 17.8 lm/W with TCTA interlayer (thickness 30 nm) and 33.7 cd/A and 19.6 lm/W with 40 nm thick interlayer are demonstrated, respectively. Results reveal a way to fabricate the phosphorescent organic light emitting device using TCTA small molecule interlayer by solution process, promising for efficient and simple manufacturing.     

探针式智能温度控制仪

探针式智能温度控制仪以热敏电阻作为温度传感器,以耐高温防腐蚀的材料做外壳,能够自由伸缩50cmo以两端通入1mA恒流源的热敏电阻作为温度传感器,单片机将采得的电压信号值经过模拟放大、A／D转换器转换．LED数码管显示温度值。该温度控制仪通过串口将采样值通过高级语言显示在计算机窗口,方便直观显示存储温度值。     

图像目标识别效果评估

提出了一种对图像单目标识别算法性能进行量化评估的方法.该方法将ROC曲线予以量化,在高斯分布假设下推导出识别算法性能的单一量化指标评估模型,采用均值和方差综合描述算法效果.并采用Sigmoid函数对Gaussian分布函数逼近的方法,结合Logistic回归分析模型,推导了评估模型的简化解算公式.该方法实现了对识别算法效果的定量评估,为不同应用环境下优化算法参数和算法组合提供了量化依据.仿真结果表明了该方法的有效性.

Abstract：

A quantitative performance evaluation method for image target detection is proposed.The Receiver Operating Characteristic (ROC) curve is quantified,and based on Gaussian distributing model,a single quantitative evaluation model is established,and the mean and standard deviation are employed to compute the performance value.The evaluation model is further simplified and becomes feasible by using Sigmoid function to approach to Gaussian distributing model,and employing Logistic model to analyze and compute the function.The quantitative performance evaluation is carried out,providing a quantitative foundation for optimizing the parameters and combination of the algorithms in different applications.Test results show the effectiveness of this method.