Two kinds of improved design project are proposed : retrofocus project and image telecentric project . original structures are solved through gauss optics and primary aberration principle , and the aberration is optimized and analyzed too . to form staring opto - electronic countermeasure device , distributing of optical unit array is simply analyzed in the end 针对初始设计方案的不足,提出两种改进的设计方案:反远距方案和像方远心方案,通过高斯光学和初级像差理论求解出光学系统初始结构,利用光学设计软件进行像差分析和优化,并且对设计的光学系统组成凝视型光电对抗设备时光学单元阵列分布进行了简单分析。
For the operating frequencies of modern radars and guidance 、 electronic countermeasure system 、 communication system 、 remote sense and remote measurement system expand to millimeter band step by step , the operating frequencies of t / r module raise ceaselessly . simultaneity millimeter wave t / r module which has the advantages of small dimension , lightweight , wide band is more suitable to the requirement of modern army and communication system . this paper is mainly referred to the research of t / r module in ka band 现代雷达与制导、电子对抗、通信、遥感遥测系统的工作频率已逐步由微波波段扩展到毫米波波段,因此t / r组件的工作频率也在不断的上升,同时,毫米波t / r组件与微波t / r组件相比具有尺寸小、重量轻、频带宽等优点,更适合现代军事和通信系统的要求。
Because gyrotron traveling wave tube amplifier ( gyro - twt ) is an important millimeter wave amplifier with the characteristics of the high output power , the broadband width , and good efficiency , which has vast application vistas in many areas such as millimeter radar , communications , electronic countermeasure , and so forth , it has been pay much respect in the world 回旋行波管是一种大功率、高效率、宽频带放大器,在毫米波雷达,通信与电子战等方面有十分重要的应用前景,因而在国际上受到高度重视。由俄罗斯人g . denisov等提出的螺旋波纹波导是一种比较理想的结构。
Unmanned air vehicle ( uav ) plays a very important role in nowadays research . recently , the applied range of the uav has expended into military , civil and scientific research scopes : in military scopes , it can be used to be detectors and monitors , electronic countermeasure , fire guidance , war evaluation , target simulation etc ; in civil scopes , it can be used to geodetic survey , detect urban environment , survey globosity resource , prevent forest - fire , pretend environment and succor disaster etc ; in scientific research scopes , it can be used to survey and research atmosphere , also it can validate new technology and now facility 随着时代的发展,无人机在社会的各个领域起着越来越重要的作用,近年来,无人机的使用范围已拓展至军事、民用和科研三大领域:在军事上,可用于侦察监视、电子对抗、火力制导、战果评估、目标模拟等;在民用上,可用于大地测量、地球资源勘测和森林防火、环境保护与灾害救援等;在科研上,可用于大气研究、气象观测、新技术新设备的试验验证等。
Bing high power resources of millimeter - wave radiation , based on electron cyclotron maser , gyrotron has been pay much respect in the world for vast applications in many areas such as plasama calefaction , linear accelerators , millimeter wave radar , communications , electronic countermeasure and so forth . prof . liu shenggang began the research on electron cyclotron maser , and later , the group leaded by prof . li hongfu has done much research work on gyrotron also , , and later , they have began the research on a kind of gyrotron amplifier - - - - - - gyroklystron 回旋脉塞器件? ?回旋管作为大功率毫米波源，在等离子体加热、线性加速器、雷达、通信及电子对抗等领域有着广泛的应用前景，因此受到了国际上的广泛重视，特别是近三十年来，回旋管得到了快速的发展，并成为了研究的热门方向。
The automatic identification of the modulation types has been applied to many fields such as source identification , interference identification , radio interception , - electronic countermeasures , etc . the modulation recognizer based on the decision - theoretic approach and the constellation diagram is proposed and the signal ' s kurtosis is used as the indicator to differentiate the analogue modulation from the digital modulation 通信信号调制类型的自动识别广泛应用于信号确认、干扰辨识、无线电侦听、电子对抗和信号监测等领域。本文提出基于决策论与星座图的综合调制识别器，使用信号的峰度区分调制类型是模拟调制还是数字调制。
Through researching imaging technique theory of sar deeply , this paper have simulated raw data of ground targets and built a common model of digital processing with object - oriented analysis and design method , which presents references for application of sar on computer . this software will be used for researching airborne sar and electronic countermeasure . the main content of this paper is concluded as follows : 1 本文在查阅了大量的文献和书籍的基础上，对合成孔径雷达的成像技术在理论上进行了深入的研究，用面向对象的分析和设计方法完成了机载sar的地面几何物体的回波仿真和一个正侧视机载sar的数字信号处理模型的仿真。
