The top image, a wide field X-ray view, reveals spectacular loops of hot gas spreading out from the southern part of The Antenna into intergalactic space. 上图是宽视场X射线照片,其中显现的是壮观的热气体环,从触角星系的南侧向外延伸至星系际空间。
Mirror image system and mirror image antenna 镜像系统和镜像天线
The simulation results show that the paired-echo response function, which effects image quality, can be caused by antenna boresight pointing instability. 理论和仿真结果表明,不论是天线方位波束指向抖动,还是距离向波束指向抖动,皆会出现成对回波现象,影响图像质量;
Accurate measurement of antenna pattern is important to spaceborne SAR image application, and distributed target antenna pattern measurement is widely concerned. 天线方向图的准确测量,对星载SAR图像的应用具有重要作用。分布目标辐射定标在星载SAR天线方向图测试中受到广泛重视。
Synthetic aperture radar ( SAR) is a kind of active coherent high resolution imaging radar system capable of producing high-resolution terrain image from data collected by a physically small aperture antenna. 合成孔径雷达是有源相干高分辨率成像雷达系统。
According to the structure characteristics of the planar slot antenna, the method of non-contact measurement is adopted. Firstly, the slot parameters of antenna are measured based on the scanning image of planar slot antenna. 针对平板裂缝天线的结构特点,对其采用非接触式的测量。首先,以平板裂缝天线的扫描图像为基础,对天线的裂缝参数进行了测量。
However, SAR image has its own unique features. Intensity inhomogeneity is occasionally visible in SAR images, which could be caused by the difference of incidence angle or physical error of the radar antenna. 然而SAR卫星图像具有自身独有的特点,有时会因为入射角度差异或者雷达天线物理误差而带有亮度偏差。
According to the comparative analysis of structures and the image quality of the optical antennas, the Cassegrain antenna has been chosen to be applied in the design of this optical antenna system. 2. 通过对各种常见光学天线的结构、成像质量进行对比分析,本论文确定在该光学天线系统的设计中采用卡塞格伦天线。
For the overall measurement scheme, we prefer the wide-angle camera to the ordinary camera to get the image, since the size of antenna is relatively large and it is not able to get the whole image in focus by using the ordinary camera. 整体测量方案中,根据天线口径较大,使用普通相机无法获取完整图像的特点,提出了使用广角镜头相机获取图像的方法。
In this thesis, on the basis of the Telepresence-Remote Control System of Tsinghua Outdoor Intelligent Motion Robot, an embedded image antenna holder control system with rapid response, high-precision, low-cost and small energy consumption is introduced. 本文以清华大学室外智能移动机器人的临场感遥控系统为应用背景,研究开发了一套响应快、精度高、成本低、功耗小的基于嵌入式的天线云台随动控制系统。
In the VC environment, the system uses OpenGL technology to accelerate the display speed of the radar image, and make it operated synchronically with the radar antenna to achieve purposes of real-time display. 实时显示的实现,是在VC++环境下,通过OpenGL技术运用,使雷达图像加速显示,使雷达的显示与天线运转同步。
The image quality and beam spread loss have been analyzed, meanwhile, the power decline curve has been obtained by means of the detailed analysis of antenna system in partial axis situation. 分析了系统的成像质量、光束发散损耗。通过对光学天线系统偏轴的建模,得出了功率衰减曲线。