基于多抽样率信号处理的无源雷达MTD方法

以数字电视信号为机会照射源的雷达系统研究为背景 ,提出用以多抽样率信号处理为基础的多级抽取信号处理算法解决运动目标检测中海量数据处理问题。文中叙述了数字电视广播信号回波的数学模型、多级抽取基本原理、目标检测算法 ,以数字电视信号为反射回波做了仿真 ,对运动目标进行检测 ,并对仿真结果做了分析。     

语音播放邮件系统的设计与实现

基于组件对象模型(COM)技术和微软Office 2000套件的自动化技术,采用内嵌可视BASIC语言(VB)应用编程方法开发了一个基于Outlook 2000的客户端文字邮件语音播放系统.详细介绍了微软语音插件Speech SDK v5.1的架构以及在Outlook 2000中内嵌VB的开发过程.该系统在功能上实现了邮件正文及附件的自动语音播放,在软件界面上实现了语音应用模块与Outlook的无缝集成.     

Development of a parallel storm surge model

A new parallel storm surge model, the Parallel Environmental Model (PEM), is developed and tested by comparisons with analytic solutions. The PEM is a 2‐D vertically averaged, wetting and drying numerical model and can be operated in explicit, semi‐implicit and fully implicit modes. In the implicit mode, the propagation, Coriolis and bottom friction terms can all be treated implicitly. The advection and diffusion terms are solved with a parallel Eulerian–Lagrangian scheme developed for this study. The model is developed specifically for use on parallel computer systems and will function accordingly in either explicit of implicit modes. Storm boundary conditions are based on a simple exponential decay of pressure from the centre of a storm. The simulated flooding caused by a major Category 5 hurricane making landfall in the Indian River Lagoon, Florida is then presented as an example application of the PEM. Copyright © 2003 John Wiley & Sons, Ltd.     

The Study of MMW and MW Attenuation Considering Multiple Scattering Effect in Sand and Dust Storms at Slant Paths

The influence of sand and dust storms on modern MMW and satellite communication systems reliability have been paid more attention to. The attenuations induced by sand and dust storms are estimated by means of Mie-theory and Rayleigh approximation, in the case of the tenuous distribution of particles. With the particle density increasing, however, these method become inadequate, the multiple scattering effects then become dominant for attenuation estimation. The attenuations considering multiple scattering effects are estimated by Monte-Carlo and four fluxes method at horizontal paths. At slant paths, based on multi-layer media model, the attenuations considering multiple scattering effects are calculated by layered Monte-Carlo method at 100, 37, 24, and 14GHz. It is shown that the multiple scattering effects should be considered at the attenuation prediction in the sand and dust storm, which the visibility is about 0.5km and smaller than 0.5km and frequency is about 20GHz. Above 30GHz, the multiple scattering effects due to sand and dust particles should be considered, as visibility is about 1km and smaller than 1km at slant paths.     

数字多媒体广播技术现状及前景

数字多媒体广播（DMB）是从数字音频广播（DAB）基础上发展起来的一种新型广播技术。数字音频广播是在调幅AM和调频FM之后的第三代广播技术。通过对数字多媒体技术的介绍较全面地阐述了其技术系统、功能、现状及发展前景。     

DVB数据广播中对象轮播技术的研究与实现

依据数字电视系统中数据广播规范对数字电视系统的增值业务——数据广播进行论述，着重对对象轮播的数据封装和传输规范进行分析，提出在终端设备上采取对象轮播技术实现数据广播业务的方法和思路，同时总结了对象轮播的特点及存在的问题。     

利用Windows计划任务设计广播站自动化播出

研究利用Windows的计划任务来解决扩音机和电脑的自动开关及建立相关音乐曲库、自动播放任务，以此实现广播系统的自动化播出。     

地面数字声音广播（DAB）及其覆盖规划的考虑

简要描述了近几年来研究开发的为移动、便携和固定接收服务的地面发射数字声音广播(DAB)系统总的特点、应达到的技术和运行要求。重点介绍了系统采用的最适合克服移动接收中出现的多径效应影响的先进源编码技术(MUSICAM)、信道编码技术(COFDM)等的基本原理、系统参数、并介绍了规划DAB业务时,在VHF/FM频段考虑的最佳频段及频谱利用改善情况,还提供了DAB单频网洛(SFN)覆盖的大体情况。其内容取材均来自1990～1992年EBU、CCIR等的最新文稿资料。     

卫星广播调度的鲁棒生长方法

本文提出基于果蝇刚毛分化自组织机理的卫星广播调度新方法，该方法生长出了这种问题的优化解。为增加自组织计算的鲁棒性引入了随机竞争排序技术，对不同大小问题的计算测试表明该方法能快速一致地产生有好的结果。     

局域网视频广播接收器的设计

描述了一个局域网视频广播接收器的设计。发送端以计算机按UDP/IP的方式向局域网中发送视频广播，在接收端利用FPGA器件设计的接收器对广播进行接收、缓冲、格式转换，以电视作为显示终端，并介绍了在FPGA器件中所设计的各个模块。