共查询到20条相似文献,搜索用时 31 毫秒
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Bian Ji 《中国航天(英文版)》2011,(4)
At 16:21 Beijing time on October 7, 2011,China successfully launched the W3C commercial telecommunications satellite manufactured by Thales Alenia Space for Eutelsat Communications into geostationary transfer orbit by using an enhanced LM-3B (LM-3B/E) launch vehicle from Xichang Satellite Launch Center. 相似文献
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《中国航天(英文版)》2017,(1)
Upper stage is an indispensable vehicle in the space transportation system.For its role in multi-satellite transportation area in China,the development of the Yuanzheng 3 upper stage was approved.The article introduces in detail the Yuanzheng 3 upper stage development requirements,task definition and systems as well as main features and performance including payload capacity and insertion accuracy for typical orbits,interfaces with satellites.The article also presents the development cycle of Yuanzheng 3 upper stage,which is divided into 3 stages including concept demonstration stage,prototype stage and flight proof stage.The Yuanzheng 3 upper stage,which will make its maiden flight in 2018,is capable of restarting more than 20 times,and operating for more than 48 hours.It is equivalent to mainstream upper stages in the world in terms of performance,such as restart times,in-orbit operation time,independent digital control system,and adaptable behavior for various tasks.Technologies tackled and accumulated in the development of the Yuanzheng 3 upper stage will lay a solid foundation for the development of future space transportation vehicles. 相似文献
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基于3D Zernike矩的三维地形匹配算法及性能分析 总被引:4,自引:0,他引:4
提出了一种基于面特征的三维地形匹配算法。在算法中,与三维地形具有一一对应关系的3D Zernike矩用来描述参考高程图(DEM)和恢复地形高程图(REM),三维地形匹配转化为基于3D Zernike矩的特征向量匹配。匹配按先粗后精两步进行,在粗匹配中,匹配窗口滑动步长设定为5个象素,采用较低阶数的3D Zernike矩。在精匹配中,只对3个最优粗匹配位置的邻近区域进行精匹配,匹配窗口滑动步长为1个象素,采用较高阶数的3DZernike矩。两块地形的相似度以它们的3D Zernike矩间Camberra距离来度量,距离越小越相似,反之亦然。本算法属于特征面匹配,相对于基于特征点和特征线的地形匹配,理论和实验证明该算法具有更高的匹配概率、匹配精度和更强的抗噪声能力。 相似文献
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对以LiNi1/3Co1/3Mn1/3O2为正极的高功率锂离子蓄电池性能进行了实验研究。给出了试验的材料和内容。用扫描电镜观察三元活性材料的表面形貌,测定了LiNi1/3Co1/3Mn1/3O2的氧化还原电位和比容量,以及ITP30单体性能。结果表明:三元材料的比容量达到170mA·h/g;在高功率放电的条件下放电终压曲线微降,2 154次循环后容量保有量为96.5%;大倍率放电条件下温度上升值也相对较小。 相似文献
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三维编织复合材料及其RTM成型工艺 总被引:4,自引:0,他引:4
文章阐述了三维编织工艺,并将三维编织复合材料的性能与传统铺层复合材料的性能作了比较。同时,还介绍了其成型方法—RTM工艺的原理及特点,并提供了一种适于RTM工艺的树脂体系。 相似文献
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《中国航天(英文版)》2017,(1)
<正>GF-3,China’s first C-band Synthetic Aperture Radar(SAR)satellite with multiple polarizations,has been put into use from January 23.The SAR-C satellite has a 1 m resolution.CNSA Deputy Director WU Yanhua and CASC Vice President YANG Baohua attended the ceremony for the commencement of formal operation of GF-3.GF-3 is the first LEO remote sens- 相似文献
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美国洛克希德·马丁公司5月24日进行了宇宙神3型运载火箭的首次发射,将欧洲通信卫星组织的一颗卫星送入地球同步转移轨道。这次发射对洛马公司未来运载业务的开展至关重要,使其拥有了同波音公司和欧洲阿里安航天公司等运载厂家展开竞争的又一利器。发射的成功同时表明,这项美俄合作计划能够克服技术转移方面的重重限制,向着预定的目标进发。一次重要的发射 宇宙神3同宇宙神系列运载火箭以往的型号相比有了重大转变,其中最重要的一点变化是采用了由俄罗斯企业研制的推进系统。宇宙神系列火箭是在洲际弹道导弹的基础上发展起来的。… 相似文献
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ISRO has developed the PSLV rocket (Polar Spacecraft Launch Vehicle) for polar orbiting satellites up to 1000 kg and is conducting a series of test missions. One of this is the IRS-P3, an remote sensing satellite with German participation. The payload consists of 3 scientific instruments: The wide field sensor WiFS for vegetation monitoring (ISRO), the imaging spectrometer MOS (DLR/Germany) for coastal zone and ocean studies an the X-ray astronomy payload (ISRO). The paper gives technical details and parameters on the launch vehicle, the satellite, the instruments and scientific goals and data utilization. 相似文献
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“资源三号”卫星遥感技术 总被引:1,自引:0,他引:1
"资源三号"(ZY-3)卫星是中国自行研制的民用高分辨率光学传输型立体测绘卫星,于2012年1月9日在太原卫星发射中心使用CZ-4B运载火箭发射升空。卫星可提供3.5m分辨率立体影像,2.1m全色/5.8m多光谱平面影像,可用于1∶50 000立体测图及更大比例尺基础地理信息产品的生产和更新。文章重点介绍了ZY-3卫星定位精度高和内方位元素稳定性强等任务特点以及内方位元素高稳定性的立体测绘相机、高速率双圆极化复用数据传输技术、角秒级定姿精度等技术创新点,简要介绍了在轨评价及应用情况,为后续测绘卫星提供参考。 相似文献