CBERS-1卫星IRMSS扫描角监控器研制

扫描角监控器是CBERS_1卫星红外多光谱扫描仪(IRMSS)中的重要部件。文章主要介绍了扫描角监控器的工作原理、主要技术指标以及研制过程中的技术状态、技术难点、关键技术和质量保证。最后对国内外相关的技术项目及经济社会效益情况做了简要对比和分析     

MTFC在光学遥感成像系统优化设计中的应用研究

图像处理作为成像链路的重要组成部分，是系统优化设计不得不考虑的一个环节，其中调制传递函数补尝（MTFC）是当今研究的热点，在遥感成像系统优化设计中发挥着重要作用。如果综合应用地面MTFC的能力，对遥感器进行优化设计，则可以大大减轻遥感器的研制难度、节约成本和缩短研制周期。该文对MTFC在光学遥感成像系统优化设计中的应用进行了一些探讨。     

MTFC在光学遥感成像系统优化设计中的应用研究

图像处理作为成像链路的重要组成部分,是系统优化设计不得不考虑的一个环节,其中调制传递函数补尝(MTFC)是当今研究的热点,在遥感成像系统优化设计中发挥着重要作用。如果综合应用地面MTFC的能力,对遥感器进行优化设计,则可以大大减轻遥感器的研制难度、节约成本和缩短研制周期。该文对MTFC在光学遥感成像系统优化设计中的应用进行了一些探讨。     

多光谱多镜头CCD相机的光学配准

文章分析了多光谱多镜头CCD相机光学配准的重要性 ,以及影响多光谱多镜头CCD相机的光学配准的各种技术因素     

紫外/红外准成像双色导引头技术研究

介绍了紫外／红外准成像双色导引头。该导引头采用玫瑰花形扫描方式，将双色信息融合技术与计算机技术相结合，用双色玫瑰扫描分时相关控制算法，实现了复杂干扰环境下的光谱鉴别等系统技术，具有对抗多个红外诱饵干扰的能力，从而使该类导弹的战术性能，特别是抗干扰性能获得了飞跃式的提高。     

一种新的卫星光学立体测量技术

提出了一种新的立体影像解析方法。在卫星轨道特性和相机交会角已知的条件下,根据对同一地物的摄影时间差提取高度信息,进而确定其三维空间位置。建立了不考虑/考虑地球自转的地物高度测定,以及位置确定模型,给出了地物空间位置计算的流程。讨论了地物高度的测量误差和对卫星平台性能的基本要求。新方法用摄影时间差的测量取代传统方法影像像点坐标的测量,更简捷和准确,更适合数字图像,具有重要应用价值。     

Analysis of the Micrometeoroid and Debris Hazard Posed to an Orbiting Parabolic Mirror

Many concepts of future space systems involve the use of parabolic mirrors for optical applications. The need for a highly reflective finish means that performance of such systems will be particularly vulnerable to space debris and micrometeoroids. A case study was performed to examine the micrometeoroid and debris hazard posed to an orbiting parabolic mirror. The mirror considered was nominally Earth-pointed in a circular orbit with two candidate altitudes in low Earth orbit (LEO), well within the region inhabited by man-made debris. The timeframes of interest for the two missions were 2002–2004 and 2005–2015. Microgram and larger particles were considered.To perform this study, it was necessary to determine the debris and meteoroid flux across the parabolic surface. To assess sensitivity of results to uncertainity in available data, two approaches were taken. The first approach was an analytical procedure based on use of long duration exposure facility (LDEF) data and published theoretical results. The second approach used two readily available computer models: the ESA MASTER model and NASA's ORDEM96. In addition, an in-house implementation of the Grün meteoroid model was used. While multiple results were available for the total flux and flux distributed over azimuth, only the MASTER model was available for generating the desired elevation data to obtain the flux distribution over the parabolic mirror. In an attempt to bound the uncertainty in the knowledge of the elevation distribution, the results from both the MASTER and ORDEM96 models were processed together to form a separate, hybrid prediction. In addition, results were used in the preliminary design of a protective skirt.This case study elucidated the practical obstacles and considerations in performing a sufficiently accurate debris and meteoroid analysis using data and tools that are readily available to the broad space sector. The resulting procedures are useful in the assessment of the risk posed to optics by the meteoroid and debris environment and in the design of protection.     

从一维正投影光流场恢复二维刚体运动和结构

研究从一维正投影光流场恢复二维刚体运动和结构。证明利用一维正投影光流场中最少3个光流点可以完全确定刚体的二维旋转运动参数，一般情况下有2个解，尽管不能确定刚体的二维平移运动参数，但利用一维正投影光流场可以完全确定二维刚体的结构。文中给出了具体算例。     

加工表面形貌的在线检测及其应用

介绍了一种基于光针法的表面形貌测量装置,它能在线测量加工工件圆周方向的波纹度和轴向表面轮廓形貌,其垂直分辨率为0.02～0.10μm,横向分辨率为30～50μm。切削试验表明,该装置能够在线识别刀具上的积屑瘤、切削过程中的颤振和刀具磨损对加工表面形貌的影响。     

Integrated guidance and control for solar sail station-keeping with optical degradation

Current control approaches for solar sail station-keeping on libration point orbits have not considered the degradation of the sail’s optical properties. However, significant optical degradation could lead to poor station-keeping performance or even complete failure. This paper presents an integrated guidance and control strategy to address this problem by updating the reference orbit based on in situ estimation. An exponential optical degradation model is incorporated into the solar radiation acceleration model, and an on-line reference orbit update approach is incorporated into the station-keeping, coupled with an active disturbance rejection controller. The reflection coefficient is estimated on-line and the reference orbit is updated discretely when the optical properties have degraded by a prescribed amount. This strategy provides discrete updates to the reference orbits such that the perturbation due to the optical degradation is maintained within a small range. These smaller perturbations can be dealt with by the controller’s robustness and station-keeping can be sustained for long durations even in the presence of large optical degradation.