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"探路者"徽章:导弹防御局、空军空间与导弹系统中心、波音公司、鲍尔宇航技术公司"探路者"天基太空监视卫星"探路者"卫星的真名是天基太空监视系统(SBSS)。"探路者"天基太空监视卫星的主人是美国战略司令部,联合空间指挥司令部。美国导弹防御局和位于加利福尼亚州洛杉矶的美国空军太空与导弹系统中心负责研发 相似文献
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基于区域卫星导航系统和临近空间应用研究,指出了临近空间是卫星导航系统天基应用领域,卫星导航系统是临近空间应用时空信息基础;提出了区域卫星导航系统天基组网、星座增强、信号增强、天基干扰、干扰定位和天基测控等临近空间应用设想以及相关关键技术;归纳了区域卫星导航系统临近空间应用目标为建立区域卫星导航系统"导航战"体系和"临近空间"天基测控体系。 相似文献
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将两轴光电跟踪仪搭载于卫星平台对空间运动目标进行持续跟踪监视正在成为一个研究热点,目前这类系统有天基空间目标监视系统(SBSS)、空间跟踪与监视系统(STSS)和持续跟踪与监视系统(PTSS)。为了解决天基目标监视中星载动基座情况下的光轴稳定跟踪控制技术,首先简化了星载光电跟踪控制系统的物理模型,然后求解了太阳同步轨道附近两卫星的相对运动角速度和角加速度大小,接着分析了基于光电复合轴方式的主动稳定跟踪控制方案和原理,最后建立了单轴系的星载光电复合轴跟踪控制系统仿真模型,计算结果为:对相对机动范围内(37.68 ()/s、47.33 ()/s2)的空间目标和相对低匀速范围内(0.1 ()/s)的空间卫星的稳定跟踪精度为2.5。 相似文献
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为了获得更高的角分辨率,空间光学望远镜的口径越来越大,口径超过4 m的空间望远镜将难以突破现有运载火箭整流罩有效包络的限制。另一方面,在研制周期及成本等方面拥有较大优势的微纳光学遥感卫星也对提高空间分辨率和集光面积有广泛的需求,需要在较小的发射体积里容纳下较大的光机系统,以降低发射成本。可展开空间光学望远镜将成为解决发射尺寸受限的可行方式。从大口径空间天文望远镜、分块式可展开对地观测望远镜和光轴方向可展开微纳卫星光学望远镜等方面对国内外可展开空间光学望远镜的研究现状进行了综述。对可展开空间光学望远镜涉及到的一些关键技术和发展趋势进行了阐述和归纳。 相似文献
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围绕对深空背景/目标信息认知与空间对抗能力的提高,提出对基于天基平台的中高轨深空目标光电信息荻取新方法;太空平台光电攻防新概念;以及深空背景/目标识别新技术研究的需求,以及其中所涉及主要技术难题,为建立国家空问光电探测/干扰技术研究基础,为进一步"和平利用空间",以及缩小与美、俄在空间攻防技术领域的差距,呼吁加大技术基础与能力建设建议.1需求技术领域(1) 天基深空目标光学信息探测;(2) 深空目标光电特征认知识别;(3) 天基光电探测/干扰卫星系列;(4) 星间激光通信信息截获干扰;(5) 空间激光探测/干扰中继卫星.2重点研究内容(1)深空目标光电信息探测新方法:1)深空目标红外辐射信息与特征探测;2)空间敌我双方目标识别方法与手段;3)卫星及天体目标激光散射特性测量;4)星间激光通信信号实时截获与破译(2) 空间平台光电攻防新体制:1)军用卫星光电探测系统特点与弱点;2)天基多波长电激励高效能新型激光器;3)星载光纤激光相控阵探测/干扰一体化;4)对空间激光/红外源低虚警探测识别;5)自适应宽波段激光防护机理与方法(3)空间卫星平台光电新技术:1)星载脉冲激光电源与高效储能技术;2)无后座力小目标近程激光推进技术;3)对卫星光学镜面/电池粘污材料技术;4)对太阳能电池板的遮蔽网覆盖技术3 主要科学技术与难点问题(1)天基高效能激光器技术(2)天基光电探测识别技术(3)空间卫星平台配套与支撑技术 相似文献
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白天卫星激光测距时,由于望远镜机架受太阳辐照和温度变化等因素影响,指向误差时变性较大,影响了对白天卫星的精确跟踪指向。针对卫星过境天区,提出了一种通过白天恒星监视,实现望远镜局部指向误差快速修正的方法,消除环境温度变化效应,实现高精度望远镜指向。以中国科学院上海天文台60 cm口径卫星激光测距系统为平台,应用短波截止滤光技术,实现了对亮于3等恒星的白天监视;并在卫星过境天区选择到6到7颗恒星进行观测,建立望远镜局部指向误差修正模型,以满足白天激光观测需求。该方法对白天卫星测距特别是高轨卫星等具有一定应用价值,也可推广到其他需白天目标观测的望远镜系统。 相似文献
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Meihua Shen Wilfred Pau Nicolas Gani Jianping Wen Shashank Deshmukh Thorsten Lill Jian Zhang Hanming Wu Guqing Xing 《半导体技术》2004,29(8)
This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration. 相似文献
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Complete approach to automatic identification and sub-pixel center location for ellipse feature 总被引:1,自引:0,他引:1
XUE Ting WU Bin SUN Mei YE Sheng-hua 《光电子快报》2008,4(1):51-54
To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction. 相似文献
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White organic light-emitting devices based on fac tris(2- phenylpyridine) iridium sensitized 5,6,11,12-tetraphenylnap -hthacene 总被引:1,自引:0,他引:1
We have fabricated the white organic light-emitting devices (WOLEDs) based on 4,4' -bis(2,2 -diphenyl vinyl)-1,1' - biphenyl (DPVBi) and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene (rubrene). The device structure is ITO/2T-NATA (20 nm)/NPBX (20 nm)/CBP: x%Ir(ppy)3:0.5% rubrene (8 nm)/NPBX (5 nm)/DPVBi (30 nm)/Alq(30 nm)/LiF(0.5 nm)/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris (2-phenylpyridine) iridium [Ir(ppy)3], acts as a yellow light-emitting layer, and N,N' -bis- (1-naphthyl)- N,N' -diphenyl -1, 1' -biphenyl-4,4' -diamine (NPBX) acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir (PPY)3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V. 相似文献
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Credence Systems Corporation 《半导体技术》2004,29(9)
Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V. 相似文献
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It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer (LDV). 相似文献
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Zhang Xinsheng 《中国通信》2014,(1)
正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta- 相似文献
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正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must 相似文献
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