Portable Microwave Reflection Coefficient Meter of Coatings

Journal of Communications Technology and Electronics - In this study, we propose a new design of a portable meter of reflection coefficients of radar absorbing coatings. An experimental comparison...     

Media,Technologies, Cooperation – Rethinking Publics and Publicness in the MENA Region

Computer Supported Cooperative Work (CSCW) -     

An improved assessment method for the temperature dependence of yield strength values

In Europe work is in progress to establish new standards for materials and it is very important that accurate data are used as a basis for property values in these standards. In addition reliable evaluation methods must be employed when the values are derived. A systematic evaluation method for yield strengths at elevated temperatures has been developed which is a modification of the ISO 2605/111 (ENV22605-3) procedure. The method has been applied to a number of steel types and has proven to provide values in good accordance with experimental data. Comparisons with existing national and international standards showed the importance of using experimental values when establishing new standards. The method is intended for use in the standard developments by the European Committee for Iron and Steel Standardisation (ECISS).     

Spatial Filtering Using the Active-Space Indexing Method

Traditionally most camera-based position estimation systems use only a few points to calibrate cameras. In this paper, we investigate a novel and alternate approach for 3D position estimation by using a larger number of points arranged in a 3D grid. We present an implementation of the active-space indexing mechanism which uses three cameras. Given the corresponding points in camera images, a precise estimation of the position can be obtained. The active-space indexing method can be also used as a spatial filter to eliminate the large number of possible corresponding pairs from consideration. This capability, unique only to the active-space indexing method, provides a tractable algorithm to the otherwise intractable situation.     

基于通用仪器的DRFM 雷达目标模拟器实现

在雷达测试系统中,需要模拟目标回波;同时,为了测试雷达的抗干扰特性,还需要产生欺骗干扰的信号。数字射频 存储(Digital Radio Frequency Memory,DRFM)由于可以高保真地存储和复制采样信号,测试系统不仅能产生多个假目标, 还能产生距离拖引干扰和速度拖引干扰,是现代雷达目标测试的首选方式。文中基于通用的矢量信号源SMW200 A和实时频谱仪FSW构建的DRFM雷达目标模拟器,实现了雷达多目标实时模拟和干扰模拟,模拟器工作频率覆盖10 kHz ~40 GHz,能够实现雷达多辐射源的信号产生、多目标回波特性、欺骗干扰、噪声干扰、多种环境杂波、合成孔径雷达面目标模拟等。基于通用仪器构建的DRFM 模拟器实现了雷达目标模拟器的通用化和标准化,适合各种雷达系统的测试需求。     

卫星系统测试中的LXI应用

卫星的应用非常广泛,例如科学研究、天气预报、航海、军事及航空航天。当今地球环绕卫星中最多应用于通信,使得地球上任意地方的人们得以沟通交流。事实上,太空里多一半的卫星都是通信卫星。除此以外,无论人们是否意识到这一点,卫星通信已经与我们日常生活的方方面面都有所关联。也许卫星通信使用最多的形式是传送全世界人们所钟爱的电视节目,此外,机场的控制管理中心也依赖于卫星通信确