雷达电磁环境仿真的一种设计与实现

本文研究了导弹作战战场雷达电磁环境仿真的设计与实现问题,建立了雷达电磁环境的数学模型和信号威胁等级识别模型,提出了一种可视化系统设计方法,在运用可视化技术的基础上,结合雷达数据库的建立,实现了导弹战场雷达电磁态势显示,其结果有助于战场指挥员快速理解战场电磁态势,为作战指挥提供相应的辅助决策支持.     

杂波环境下雷达信号处理的SystemVue建模与仿真方法研究

对雷达信号处理的仿真建模方法进行研究,利用SystemVue仿真平台中专用的雷达模型库构建雷达系统仿真模型,并对杂波环境下的雷达信号处理过程进行雷达系统的建模与仿真实现。首先,分析雷达回波生成过程及雷达信号处理的基本原理;其次,研究雷达仿真模型库中目标模型、杂波/噪声模型、脉冲压缩模型、MTD模型、CFAR模型的功能作用及参数设置;最后,利用SystemVue仿真平台搭建杂波环境下雷达系统仿真模型,并基于矩阵类型的数据对雷达信号处理过程进行仿真。经过仿真,雷达系统模型的信号处理结果与理论相符,验证了该仿真模型的正确性。     

相控阵雷达系统的仿真

雷达的数字仿真及雷达仿真库的建立已经成为近年来雷达领域研究的热点。本文主要进行相控阵雷达系统的仿真研究。首先根据相控阵雷达的组成和原理,建立相控阵雷达的仿真模型与数学模型。然后选择Simulink作为仿真平台,对相控阵雷达系统进行仿真与研究。仿真的模块主要有天线模块、信号环境模块、信号处理模块以及GUI人机交互界面模块。最终在Simulink库中生成自己的雷达子库,形成相控阵雷达系统,为后续相控阵雷达的研究奠定基础。     

雷达侦察系统参数测量的建模与仿真

在雷达侦察系统工作过程中,对表征敌方雷达信号特征的参数进行测量是后续进行信号分选和辐射源识别的前提条件;首先介绍了相位差测频和相位干涉仪测向的基本原理,然后对常用于表征雷达信号特征的参数的测量过程建立了数学模型,最后对建立的数学模型进行了仿真验证;仿真的结果表明,建立的数学模型能够有效地模拟雷达侦察系统对雷达信号参数的测量。     

某型雷达模拟器仿真系统的设计与实现

该文给出了雷达仿真系统的主要模型,并解决了辐射源威胁判断,雷达信号可信度识别等关键问题,提出了实现方法,系统完整实现了对某型雷达的功能模拟。     

PD雷达有源干扰系统的计算机仿真

为了方便有效地对PD雷达进行干扰抗干扰技术研究,需要利用某种计算机仿真技术,建立一套仿真系统,最大程度地模拟PD雷达干扰环境.基于此目的,文章首先描述了PD雷达发射信号的数学模型,重点研究了常见的两种PD雷达有源干扰方式及其作用机理,并采用MATLAB/SIMULINK仿真技术对信号,干扰等模块进行建模.仿真结果显示,建立的模型可以有效模拟对PD雷达实施的各种干扰.建模过程简单有效,因此,可以在该系统上进一步进行干扰手段改进或者抗干扰性能的仿真,有助于PD雷达干扰抗干扰技术的研究.     

雷达侦察数据的建模与仿真验证研究

针对雷达侦察数据是进行雷达信号分选和识别箅法研究的基础,在介绍雷达侦察设备对脉冲参数截获测量原理的基础上,分析了雷达信号的变化特征,进而提出脉宽-脉幅等参数之间的关系模型,建立雷达侦察数据中各脉冲参数和误差的数学模型,最后设计并实现雷达侦察数据仿真软件,利用非参数假设检验的方法对模型进行了仿真.仿真结果表明,模型可以较逼真的反映外场试验数据的变化特征,能够为综合电子信息系统的目标识别试验提供可靠仿真数据源.     

某雷达信号环境模拟器杂波模拟方法研究

在现代电子信息靶场中,由雷达信号环境模拟器模拟提供的雷达杂波信号,是电子信息靶场构成试验能力的重要组成部分.文章从雷达杂波回波模型出发,针对不同雷达环境和被测雷达,介绍了杂波模型的选取,分析、阐述了杂波视频信号的仿真方法,并以典型杂波模型为例,利用MATLAB进行了数学仿真.在此基础上对某不具备杂波模拟功能的雷达信号环境模拟器,提出了一种利用开发软件计算模块生成杂波视频信号,进而实现杂波射频信号模拟的方法.该方法已成功应用于该模拟器上,取得了较好效果.     

制导半实物仿真中的目标角闪烁特性仿真方法

在雷达目标特性的研究中,关于角闪烁的问题,大多数是从数学模型和数字仿真方面描述的,在制导半实物仿真系统中如何实时生成带有角闪烁特性的雷达目标回波,是对雷达目标特性研究的一个新方面.为真实实现雷达的射频目标,提出了一种在导弹制导半实物仿真系统中仿真具有角闪烁特性的雷达目标回波信号的方法,将由数学模型计算得到的角闪烁数据,引入阵列馈电控制系统中,形成带有角闪烁特性的雷达目标回波信号,采用仿真方法复现了导弹面临的电磁环境.仿真结果表明,雷达目标特性实现实际工作过程中可能的问题,为设计提供了依据.     

基于KD-JMASE的信号级雷达系统仿真

目前的雷达仿真系统,建模方法与接口标准不统一,模型重用性和互操作性差,这是雷达仿真领域的重点之一,也是难点.针对上述问题,利用联合建模与仿真环境(KD-JMASE)建模与仿真的良好的重用性和互操作性,并结合雷达信号处理的相关理论,分析雷达系统各个模块间的信号过程,设计与实现了信号级雷达系统的模块化模型,并通过建立目标的运动模型,在信号层面上实现了对空警戒雷达完整工作过程的仿真,仿真结果表明:用KD-JMASE所建立的系统能够真实反映雷达的信号过程及特性,精度符合要求,且所建立的模块化模型具有良好的重用性与互操作性,非常便于模型后期的修改,替换与扩展,不但满足不同环境下的仿真要求,还能大大提高建模与仿真的效率.     

轻松打造多系统环境

随着硬盘容量的变大和操作系统的层出不穷,装双系统甚至多系统的人越来越多了。PowerQuest BootMagic是一个强力磁盘管理工具,可以在单机上运行多个操作系统。每次重新启动计算机时,BootMagic都会提供一个您可以启动的操作系统列表。其中的配置程序可以让您快速选择要在BootMagic菜单中显示的操作系统。     

Future interconnection environment

The emergence of the Web provided an unprecedented AI research and application platform. By providing access to human-readable content stored in any computer connected to the Internet, it revolutionized business, scientific research, government, and public information services around the globe. Networks pervade nature, society, and virtual worlds, giving structure and function to a variety of resources and behaviors. Discovering the rules that govern the future interconnection environment is a major challenge. The China Knowledge Grid Research Group, is exploring the operating principles of this future interconnection environment.     

The marine environment

Abstract

The European marine community has lent strong support to satellite remote sensing techniques that have emerged over the last 15-20 years. Now Europe has its own remote sensing satellite, the European Remote Sensing Satellite (ERS-1) largely directed to ocean measurements—especially surface winds, waves and currents-by means of its suite of microwave sensors.

European marine scientists also played a significant role in the arduous task of extracting reliable ocean colour signals from the record of the Coastal Zone Colour Scanner (1978-1986) over European waters.

Unlike meteorologists the marine community has not yet enjoyed the benefits of an operational satellite system [c.f the National Oceanic and Atmospheric Administration's satellites (NOAA) and Meteosat], but the analysis of data provided by United States satellites indicates that this decade will sec substantial benefits accrue to a wide variety of marine activities. Through its European Space Agency and through dedicated national programmes, Europe is now cast as one of the key players in remote sensing of the marine environment.     

The hovercraft environment

In just over a decade the hovercraft has progressed from first prototype to a successful commercial form of transport which also has the ability to penetrate many environments hitherto virtually inaccessible to manned vehicles. Comparison with rival short range vehicles such as the helicopter and hydrofoil show that the hovercraft has become one of the most versatile forms of transport available. This versatility and ability to operate in unusual or extreme environments has been accompanied by the problems of control and of protection of the occupants of the hovercraft from the hazards associated with these environments. Several of these problems are discussed, together with their possible solutions. This article is based on a paper given to the Nederlands Vereniging Voor Ergonomie/Ergonomics Research Society joint conference at Noordwijk in Holland, 11-13 June, 1969.     

未知环境下的移动机器人环境建模研究

环境建模技术是移动机器人自主导航研究中的一个关键问题。为了实现机器人在未知环境下的自主导航,本文在分析当前普遍采用的一些环境建模方法及其缺点的基础上,提出一种基于多传感器信息融合的环境建模方法。实验结果表明该方法有效地克服了传感器的累计误差,有效地提高了环境建模的准确性。此方法的可行性和有效性通过Pioneer3-DX移动机器人得到了实验验证。     

未知环境下的移动机器人环境建模研究

环境建模技术是移动机器人自主导航研究中的一个关键问题。本文给出一种基于多传感器信息融合的环境建模方法。实验结果表明该方法有效地克服了传感器的累计误差,有效地提高了环境建模的准确性。此方法的可行性和有效性通过Pioneer3-DX移动机器人得到了实验验证。     

Technology and its environment

If one interprets the ecology of technology as the study of technology in relation to its environment, there are two important levels at which this study can be made. It is possible to consider the different environments in Europe, Japan and the USA, and look for the different technological influences which accompany them. At a more general level, one can look at those factors which are common to all three environments, and which are associated with generic similarities in the technology of all three areas.The paper considers both aspects as they have been experienced in Europe in some attempts to develop a human-centred technology.Paper given at Conference on Ecology of Science and Technology, Japan Science Foundation, Tokyo, 1992.     

Collaborative object-oriented visualization environment

In this paper, we present a Collaborative Object-oriented Visualization Environment (COVE) which provides a flexible and extensible framework for collaborative visualization. COVE integrates collaborative and parallel computing environments based on a distributed object model. It is built as a collection of concurrent objects: collaborative and application objects which interact with one another to construct collaborative parallel computing environments. The former enables COVE to execute various collaborative functions, while the latter allows it to execute fast parallel visualization in various modes. Also, flexibility and extensibility are provided by plugging the proper application objects into COVE at run-time, and making them interact with one another through collaboration objects. For our experiment, three visualization modes for volume rendering are designed and implemented to support the fast and flexible analysis of volume data in a collaborative environment. This work has been supported by KIPA-Information Technology Research Center, University research program by Ministry of Information & Communication, and Brain Korea 21 projects in 2005.