Spectrum sharing considerations for the proposed ESA ‘archimedes’ satellite DAB service

At the 1992 World Administrative Radio Conference (WARC), spectrum was allocated, on a primary basis, to the broadcast satellite service (sound). The allocations were not, however, uniform worldwide, nor will the BSS(S) have sole use of these allocations. In addition, many countries have reserved primary use of the spectrum for existing services until 2007, with the BSS(S) permitted only on a noninterference basis. This situation will impose serious constraints on the proposed ESA S-DAB service, to be radiated from the ‘Archimedes’ constellation of satellites. The launch date for this service may be before the end of the century, and sharing with other spectrum users will therefore be necessary. Such users include fixed telephony links, broadcast links and mobile aeronautical telemetry. This paper reviews current spectrum usage in Europe and elsewhere, and investigates the restrictions thus imposed on the ESA S-DAB service. Numerical examples based on real-world systems are given, and demonstrate the feasibility, in many cases, of spectrum sharing.     

宽带通信中的干扰抑制处理方法研究

综述了DS/FH宽带通信系统中的干扰抑制预滤波处理方法，并侧重时频域的干扰消除技术，基于有关处理算法的适用条件和性能，探讨多系统共存环境下AIC（自适应干扰消除）处理的使用。     

CGHOE_s研究中的发现

讨论用正确的原始值进行光栅光学元件的设计。用提出的平均空间频率及干涉级次之间关系的定律，计算光栅衍射元件的正确性得到理论及实践的证实。     

空气——乙炔火焰原子吸收法测定铬时铁的干扰及抑制方法

介绍了用空气－－乙炔火焰原子吸收法测定铬时铁的干扰状况以及抑制这种干扰的方法。本法应用于生铸铁，碳钢，低合金钢中铬量的测定，结果理想。     

电磁兼容设计中的地线干扰与抑制

20世纪人类最杰出的成就之一是电子技术和信息技术.电子信息系统的可靠性对生产、生活乃至国家安全都产生了巨大的影响.对信息系统可靠性造成影响的主要原因之一是电磁干扰.随着电气、电子设备的大量使用,我们周围的环境中充满了各种频率的电磁波,这些电磁波对于电子设备而言都是潜在的干扰源.在这里,主要介绍一些关于地线所造成的干扰以及相应的抑制方法. 电磁兼容技术是电子产品设计人员必须了解和掌握的基础性技术之一.     

地震勘探数据采集系统抗干扰技术研究

地震勘探采集系统作为一个大型的电子设备，在地震勘探数据采集过程中，经常会受到外界不可见的电磁干扰，由于检波器接收到的中深层反射信号较弱，因而这些干扰对原始的地震数据影响很大，会造成原始数据失真，致使采集质量下降。本文从地震勘探数据采集系统受电磁干扰的途径进行分析，提供了一些相应的解决方法。     

ICP—AES多元素同时测定中光谱干扰及基体效应的校正

本文将最优化组合设计与数据分析结合起来用于校正 ICP—AES 中的干扰效应。通过对组合设计进行改进,使设计过程及分析测定更加简化。以 APPLEⅡ微机通过 BASIC 程序对测得数据进行脱机处理,能够准确地对 ICP—AES 分析中复杂基体产生的光谱干扰和基体效应进行校正。     

基于跳频技术的卫星通信干扰分析与比较

简要分析了跳频通信的基本特点和优点，通过计算和比较卫星通信常见的几种干扰方式（宽带噪声干扰、窄带噪声干扰和脉冲干扰）的处理增益和误码率，得出了脉冲干扰对跳频技术下的卫星通信具有较好的干扰效果这一结论，并给出了与理论分析相一致的仿真结果。     

Europe's long-term climate target: A critical evaluation

The European Commission as a whole and a number of its Member States individually have adopted a stringent long-term target for climate policy, namely that the global mean temperature should not rise more than 2 °C above pre-industrial times. This target is supported by rather thin arguments, based on inadequate methods, sloppy reasoning, and selective citation from a very narrow set of studies. In the scientific literature on “dangerous interference with the climate system”, most studies discuss either methodological issues, or carefully lay out the arguments for or against a particular target. These studies do not make specific recommendations, with the exception of cost-benefit analyses, which unanimously argue for less stringent policy targets. However, there are also a few “scientific” studies that recommend a target without supporting argumentation. Overall, the 2 °C target of the EU seems unfounded.     

迈克尔逊干涉型加速度地震检波器集成芯片

提出了一种新型的迈克尔逊干涉型混合集成光学加速度地震检波器。以尺寸为38mm×6mm×2mm的X切Y传LiNbO3晶体为基底,详细分析并设计了迈克尔逊干涉芯片的双Y分支波导、相位调制器和偏振器。对成功制作的迈克尔逊干涉芯片进行了通光测试,并对检测器进行了测试。结果表明,检波器及芯片性能良好,振动与检波器输出信号吻合良好。该检波器系统的主要设计参数为:自然频率3549Hz,相位检测灵敏度ΔΦ/a为1.1×10-2rad/m/s2,工作频带0～1065Hz。