Integrated global networks,tomorrow' communications today

This article presents an overview of the concept of a multiple purpose global satellite network. It identifies some of the main needs of telecommunication services today, and projects the potential of future demands. It also describes the great possibilities of economic expansion and mass participation in the growth and prosperity of a nation, if basic telecommunication services are accessible on a global scale. The study suggests that the rapid recovery of capital investments on universal satellite networks lies in developing regions through cost-effective service diversification.     

一种提高低动态GPS接收机动态适应能力的方法

论述了一种在载体飞行过程中利用惯导系统提供速度辅助信息，使低动态民用全球定位系统接收机适应飞行器的高动态环境。对载体进行精确定位的一种方法，并给出了利用ＧＰＳ卫星信号模拟器进行地面动态仿真试验的结果。     

部分相干光倾斜照明成像研究

本文用部分相干光成像理论研究了提高分辨力及增大焦深的原理．建立了二元光栅倾斜照明成像数理模型。对几种倾斜照明方式进行了模拟计算．对模拟结果作了分析比较。结果表明，用二元光栅照明较好，既能较大程度提高投影光刻曝光系统的分辨力及焦深，又能克服其他照明方式的能量利用率低等缺点。     

First experiment of Argentine solar cells in space: modules fabrication, characterisation, and telemetry data analysis from SAC-A satellite

On December 1998, the Endeavour space shuttle launched the Argentine satellite SAC-A. Among several technological experiments, this satellite included a set of crystalline silicon solar cells fabricated in Argentina to test them in the space environment. In this paper, we describe the experiments associated with these solar cells and analyse the corresponding telemetry data received from January to July 1999.Fabrication and characterisation of modules are presented. Some preliminary radiation damage experiments using 10 MeV protons supplied by a cyclotron accelerator were also performed.     

光子计数成像技术及其应用

随着微光像增强技术和弱光成像器件的发展 ,光子计数成像技术近年来发展很快并日趋成熟 ,光子计数成像在军事、天文学、物理学、化学、生物学、量子电子学等领域得到了广泛应用。介绍了光子计数成像的原理、技术特点及其应用。     

Evolutionary association rules for total ozone content modeling from satellite observations

In this paper we propose an evolutionary method of association rules discovery (EQAR, Evolutionary Quantitative Association Rules) that extends a recently published algorithm by the authors and we describe its application to a problem of Total Ozone Content (TOC) modeling in the Iberian Peninsula. We use TOC data from the Total Ozone Mapping Spectrometer (TOMS) on board the NASA Nimbus-7 satellite measured at three locations (Lisbon, Madrid and Murcia) of the Iberian Peninsula. As prediction variables for the association rules we consider several meteorological variables, such as Outgoing Long-wave Radiation (OLR), Temperature at 50 hPa level, Tropopause height, and wind vertical velocity component at 200 hPa. We show that the best association rules obtained by EQAR are able to accurate modeling the TOC data in the three locations considered, providing results which agree to previous works in the literature.     

基于紫外成像的电晕放电参数变化特性及距离修正方法研究

鉴于光斑面积是紫外成像检测电晕放电的一种有效量化参数,以棒-板模型交流放电为例,研究了不同交流放电强度下光斑面积随紫外成像仪的增益与观测距离的变化而变化的特性,并进行了拟合分析。结果表明,光斑面积与紫外成像仪的增益近似呈指数关系变化,与观测距离之间近似呈幂函数关系。在此基础上,为了将不同距离下的观测结果归一到同一距离上以便提出可行的应用判据,根据试验获得的样本数据,建立了自适应模糊逻辑推理模型(ANFIS),实现了对观测结果的归一化处理,测试结果表明该模型具有较高的精度。     

利用线性预测与查表法的高光谱图像压缩

提出了一种线性预测和多谱带查表相结合的高光谱图像无损压缩算法.首先,根据高光谱图像谱带间具有强相关性的特点,建立基于Yule-Walker方程的线性预测模型,其中方程系数矩阵为非Toeplitz形式的对称矩阵,需要使用改进的Levinson算法进行求解.其次,针对校正后的高光谱图像具有稀疏直方图的特点,提出了多谱带查表法,对线性预测的结果进行修正,去除这些图像中因校正引起的信息冗余;而对未校正图像,则不使用该步骤处理.最后,使用熵编码器对预测误差进行编码.分别使用自适应算术编码和Golomb-Rice编码作为熵编码器进行了测试,结果表明:本文算法具有较高的压缩比,压缩效果好于国际空间数据系统咨询委员会(CCSDS)的标准算法.     

电力系统寻呼网的发展应用分析

通过对国内寻呼业的发展分析，结合电力系统优势，介绍今后电力寻呼网的几种发展可能及社会应用。     

紫外成像技术在特高压工程中的应用

通过介绍紫外成像技术在国内首个1 000 kV特高压交流试验示范工程交接试验和技术监督中的应用情况,分析和总结了紫外成像测试过程中的影响因素。