共查询到20条相似文献,搜索用时 140 毫秒
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文章针对高分辨率对地观测卫星,介绍一种新的方法来实时测量卫星运动在焦平面上的像移。详细地说明了像移实时测量的原理,具体推导了像移测量的数学表达式。测量出的像移可以用来对畸变的图像进行校正,获得高质量的图像。 相似文献
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CBERS-1卫星CCD相机像元实地分辨能力的测量及辐射特性浅析 总被引:1,自引:0,他引:1
利用CBERS - 1卫星数据、大比例尺航片和经过几何精纠正的高分辨率卫星图像进行测量、检验 ,阐述CCD相机像元实地分辨能力的测量原理和测量结果 ,并浅析其遥感图像的辐射特性 相似文献
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侧摆摄影偏流角和速高比的计算模型 总被引:3,自引:1,他引:3
像移会使图像质量退化,分辨率下降,为此必须对像移进行补偿。文章从空间相机像移补偿的角度出发,建立了卫星遥感中偏流角和速高比的概念;通过坐标转换推导出了卫星在星下点、侧摆、俯仰摄影模式下偏流角和速高比的计算公式,从而可考虑对所产生的像移进行补偿。 相似文献
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低轨卫星面阵凝视成像技术研究 总被引:2,自引:0,他引:2
文章介绍了面阵凝视成像的工作原理及特点,阐述了低轨卫星对地观测凝视成像面临的像移问题及其解决措施,对像移补偿装置与二维指向机构的结合做了初步探讨。 相似文献
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合成孔径雷达卫星定位误差源分析 总被引:4,自引:1,他引:4
根据合成孔径雷达(SAR)星等斜距民我普勒频移的曲线相交和扁椭圆地球模型、多普勒频率漂移与卫星至目标斜距联立方且的解,详细阐述了SAR星地面目标图像像定位原理。着重分析了平台星历、回波时延、目标高度、多普勒中心频率和时钟等误差与定位精度的关系,最后举例说明误差源的属性。 相似文献
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高分辨率卫星结构-控制-光学一体化建模与微振动响应分析 总被引:5,自引:1,他引:5
文章针对高分辨率遥感卫星的微振动分析,给出了一种结构-控制-光学一体化建模方法:将微振动干扰源模型、整星结构模型、控制系统模型和光学系统模型按照实际的物理联系连接为一个整体,进而预测空间相机在轨微振动的像移响应和干扰源到像移的传递特性。以某遥感卫星为例,将其微振动下的像移响应和传递特性与工程中的其他处理方法的计算结果进行了对比分析。研究结果表明:一体化建模分析方法从原理上更接近卫星在轨实际工作情况,能够给出较为合理的微振动分析结果;其他工程处理方法的分析结果均与一体化建模分析方法有差异,使用时应根据设计和分析的具体目的与条件恰当选择。 相似文献
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用完全不同的方法推导出一种两颗卫星相对运动的表达式.首先,它描述的是一颗真实的卫星相对一颗在理想轨道上运动的虚拟卫星的运动,而这正是研究编队飞行所必须的;其次,这个表达式将真实卫星相对虚拟卫星的三维位置表示成虚拟卫星的Brouwer平根数及两卫星轨道根数之差的函数.据此便可以充分应用已有的关于轨道摄动的研究成果.作为一个基本模型,首先讨论了一颗真实卫星相对虚拟卫星形成椭圆型地面轨迹的飞行方式.基于轨道长期摄动的已有结果可以很容易地揭示这种飞行方式的长期变化,从而可以毫无困难地制定出轨道调整的策略.最后还研究了三颗卫星以同一条椭圆轨迹飞行的轨道设计和控制问题,该椭圆以虚拟卫星为中心. 相似文献
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A. A. Davydov 《Cosmic Research》2011,49(4):335-344
A communication satellite (small spacecraft) injected into a geosynchronous orbit is considered. Flywheel engines are used
to control the rotational spacecraft motion. The spacecraft after the emergency situation has passed into a state of uncontrolled
rotation. In this case, no direct telemetric information about parameters of its rotational motion was accessible. As a result,
the problem arose to determine the rotational satellite motion according to the available indirect information: current taken
from the solar panels. Telemetric measurements of solar panel current obtained on the time interval of a few hours were simultaneously
processed by the least squares method integrating the equations of rotational satellite motion. We present the results of
processing 10 intervals of the measurement data allowing one to determine the real rotational spacecraft motion and to estimate
the total angular momentum of flywheel engines. 相似文献
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为了快速侦察未知区域的地貌信息,遥感卫星可对特定区域进行扫描以获取遥感卫星影像。当卫星经过国外未知区域时,部分卫星无法针对某特定区域进行长时间的驻留扫描,本文提出一种基于条件生成对抗网络模型(Conditional Generative Adversarial Network,CGAN)进行网络训练,前期将某方法获取的区域轮廓地形信息作为CGAN网络的生成网络和鉴别网络中的条件约束信息,通过网络生成器与判别器在训练过程中互相博弈产生特定的输出集,有效地实现由单张电子轮廓图像到对应卫星遥感图像的端到端的非线性映射。本文通过原真实卫星遥感图像与生成卫星遥感图像进行四种对比误差计算,平均误差、均方误差与结构相似度均高于99%,峰值信噪比高于30 dB,生成的图像与原图像之间具备高相似度,实现了在获取坐标定位轮廓信息的先验条件下,对特定区域进行遥感卫星影像内容重建技术。 相似文献
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Luiz Danilo Damasceno Ferreira Atair Rios Neto Nellore Srinivasan Venkataraman 《Acta Astronautica》1985,12(11):899-905
The modelling, analysis and synthesis of an attitude control system for low orbit artificial satellites using stabilizing flaps are presented. The function of the system is to maintain the satellite aligned with the local vertical. The aerodynamic forces on the satellite are modelled assuming free molecular flow using the kinetic theory of gases. The control system development is considered through the application of stochastic control concepts. The satellite motion is described by the equations of motion based on Newtonian formulation. Starting from the separation principle, a sequential procedure is developed in which the state estimation and control problems are handled simultaneously. State estimate is provided by Kalman filter using the information about the position of the satellite and of the flaps. The controller acts on satellite in real time, and the stabilizing flaps are the only control elements. 相似文献
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针对倾斜地球同步轨道(IGSO)和中高地球轨道(MEO)卫星用于卫星双向时间传递(TWSTFT)时的卫星运动所引入的误差进行了研究,并对IGSO和MEO卫星应用于TWSTFT的可行性进行了分析。首先推导了TWSTFT中的卫星运动误差公式,并利用两行根数(TLE)对目前在轨的IGSO和MEO卫星的运动进行了计算,在此基础... 相似文献
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The paper has studied the accuracy of the technique that allows the rotational motion of the Earth artificial satellites (AES) to be reconstructed based on the data of onboard measurements of angular velocity vectors and the strength of the Earth magnetic field (EMF). The technique is based on kinematic equations of the rotational motion of a rigid body. Both types of measurement data collected over some time interval have been processed jointly. The angular velocity measurements have been approximated using convenient formulas, which are substituted into the kinematic differential equations for the quaternion that specifies the transition from the body-fixed coordinate system of a satellite to the inertial coordinate system. Thus obtained equations represent a kinematic model of the rotational motion of a satellite. The solution of these equations, which approximate real motion, has been found by the least-square method from the condition of best fitting between the data of measurements of the EMF strength vector and its calculated values. The accuracy of the technique has been estimated by processing the data obtained from the board of the service module of the International Space Station (ISS). The reconstruction of station motion using the aforementioned technique has been compared with the telemetry data on the actual motion of the station. The technique has allowed us to reconstruct the station motion in the orbital orientation mode with a maximum error less than 0.6° and the turns with a maximal error of less than 1.2°. 相似文献