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介绍了一种阵列信号频分复用毫米波传输技术.采用分组二次上变频频谱装配频分复用和解复用技术,实现多路阵列信号在一条宽带毫米波链路上进行双向传输.通过设计控制和幅相校正技术保证了阵列信号分量间的良好幅相一致性.完成了30路阵列信号传输设备研制并进行了测试,结果证明了技术方案的可行性.该技术可以应用到多路阵列信号的毫米波传输... 相似文献
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为了满足航空光电吊舱多路Cameralink数字图像传输的需要,设计了以可编程逻辑器件(FPGA)作为核心处理器的多路Cameralink数字图像光纤传输系统。利用编解码芯片完成了Cameralink数字图像输入输出的信号转换。设计了异步FIFO数据缓存模块,解决了像素时钟域与Aurora协议用户时钟域的匹配问题。采用Aurora 8B/10B协议进行图像数据的编码、转换,结合高性能的波分复用光模块完成多路数字图像的传输。实验结果表明,数字图像数据传输的误码率低于10~(-12),图像传输效果清晰稳定。能够应用于多路Cameralink数字图像的传输。 相似文献
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介绍了一种采用FPGA来实现8路OTU1-L或8路[OTU2v-L]/4到2路OTU2v-L的处理。用1块FPGA完成8路OTU1-L或8路[OTU2v-L]/4到2路OTU2v-L拆分的映射/解映射,并实现主备无损倒换,每片FPGA处理2路10G业务。具体讲解了信号在通道传输中怎样被检测的设计思路和实现方法。 相似文献
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常用的音频传输接口I2S只能传输两路音频信号即左右通道,为了提高单根线路的传输能力,在单根传输线上传输多路音频数据,此设计完成了多通道音频接口的设计,使之能够发送和接收多通道的音频数据。32路的立体声转化成64个通道通过光纤或同轴电缆串行发送出去,与此同时可以接收到64个通道的串行音频数据,转化成32路的立体声。该设计主要采用Xilinx公司的FPGA芯片Spartan3e和接收发送芯片CY7C9689配合完成,由FPGA控制CY7C9689的接收与发送过程。 相似文献
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针对移动扩频接力设备A接口或移动程控设备群路A接口与固定光传送设备不能实现2 Mbps链路互联的问题,研制了基于光传送网的多功能接口.整体设计采用模块化结构、大规模集成电路和单片机处理技术.实现了光传送装备与某种扩频接力设备无缝连接,完成群路A接口与基群E1接口和以太网ET接口的转换;信号实时监视和告警功能.通过在海拔3 700 m地区20 km距离开通试用,信号传输正常. 相似文献
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电磁兼容设计及其应用 总被引:3,自引:0,他引:3
以实际工程中常遇到的电磁兼容问题为背景,简要地介绍了有关电磁干扰及有关抗干扰措施方面的内容。通过对接地方法、屏蔽思想和滤波手段的详细论述和独到见解,提出了系统电磁兼容的设计思想以及解决方法,并对实际工作中常见的干扰、滤波及接地等电磁兼容现象给出相应分析与解决建议。 相似文献
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Nippon Telegraph and Telephone Corporation (NTT) is now promoting the Information Network System (INS) project, which is expected to be an important part of the basic infrastructure of the coming advanced information society. The purpose of INS is to provide various telecommunication services in a more economical and convenient manner by totally digitalized networks. The INS Model System-a pilot plant-was put into service in September 1984 in Mitaka City, which is adjacent to the Tokyo metropolitan area. This experiment is regarded as a "big" initial step toward the introduction of nationwide INS services. This paper reviews the system as well as service aspect of the experiment, where emphasis is laid on the actual operation status. 相似文献
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本论文的研究是以北京理工大学珠海学院(以下简称珠海学院)校园网络建设、发展的实际情况作为基础,是珠海学院4年来校园网络问题的一个整体解决方案,本论文所提出的安全管理体系是整体安全解决方案的一种理论概括。珠海学院的校园网络安全防范方面,不是简单的技术堆叠,是创造性地应用了ACL、防火墙、IDS、流量管理、入侵检测、漏洞扫描等技术手段。全网的安全措施设计自用户端延伸到互联网出口,在用户数据流的各个环节中都应用了安全防范措施。在实际运行中,非常有效的控制了网络中主要的安全问题,网络相当稳定。本论文最终建立了适应独立学院网络安全管理的体系模型及应用模式,为校园网络中所存在的严重安全问题提出一种思路及解决办法。 相似文献
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提出了一种红外成像系统的最小可分辨温差(Minimum Resolvable Temperature Difference,MRTD)预测方法。该方法以线性系统理论为基础,利用调制传递函数建立红外成像系统模型,模拟生成不同空间频率的标准四杆靶(长宽比为7:1);通过分析四杆靶的二维(横向和纵向)成像质量,引入对比度修正因子,获取系统输出的四杆靶与背景的温差;利用阈值输入对比度温差,得到系统的MRTD。仿真试验表明,该方法预测的MRTD值与实际测量值一致。 相似文献
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X. Perpi A. Castellazzi M. Piton M. Mermet-Guyennet J. Milln 《Microelectronics Reliability》2007,47(9-11):1784
In this work, temperature inhomogeneities inside IGBT modules are measured to assess their relevance for the component reliability. Such issue has not been considered in many previous studies, since it is often assumed that the electro-thermal characteristics of IGBTs compensate for such temperature differences. Starting from real temperature measurements, this work discusses such aspect aided by electro-thermal simulations. This method provides useful information for the reliable thermal design of power modules, also considering the actual cooling system. 相似文献
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As tools for artwork restoration, image-processing techniques serve two purposes. They can be used as a guide to the actual restoration of the artwork (computer-guided restoration). Or, they can produce a digitally restored version of the work, which itself is valuable, although the restoration is only virtual and cannot be reproduced on the real piece of work (virtual restoration). We present two applications of digital image processing for restoring artworks. The first belongs to the class of computer-guided restoration techniques, and the second represents an example of virtual artwork restoration. The first example refers to cleaning dirty paintings. More specifically, we describe a technique that, by relying on cleaning a small patch of the painting, can foresee the final result when the same cleaning methodology is applied to the whole piece of work. Restorers can use it by applying a set of different cleaning methodologies to very small patches of the painting. They can then use the virtual cleaning software to determine which cleaning procedure is likely to give the best result, thus using digital image processing as a tool to guide the actual restoration of the artwork. In our second example, we present a system for removing cracks from old paintings and frescos. In many cases, cracks severely deteriorate the aspect of paintings both because of their number and their heaviness. Thus, a system capable of removing them is of great interest, even if the removal is only virtual 相似文献