极远紫外成像光谱仪在空间科学中的应用与展望

极远紫外成像光谱仪是空间科学研究中重要的数据获取工具,通过对不同天体目标极远紫外辐射的观测,可以反演出天体中主要物质的含量和变化规律,从而为空间天气、宇宙起源等许多前沿科学提供研究资料。文章分析了极远紫外成像光谱仪在空间科学研究中的优势,介绍了国际发展概况．列举了日地空间环境观测、地外行星体观测和宇宙空间观测3个应用领...     

传输型线阵测绘相机几何精度标定方法

分析了传统框幅式测绘相机几何精度评价和测试方法的局限性：不适用于以长焦距、小视场角为主的传输型线阵测绘相机。从传输型测绘相机原理出发。分析了以视主点作为传输型测绘相机主点评价指标的合理性和可行性。指出了同传统方法相比在几何精度标定过程中需要注意的问题并提出标定方法。     

多指标LMI鲁棒故障检测滤波器在卫星姿态控制系统中的应用

卫星在轨运行中,需要对其故障进行及时的检测,模型的不确定性使得如何在轨卫星的故障检测产生了很大的干扰。以往的方法是将故障、输入和干扰统一作为广义输入,通过H∞范数增益最小使得系统残差最大程度地接近于故障,然而这不能反映故障、输入和干扰三者的重要关系。为此需要研究三者到残差增益的多指标下,滤波器的参数设计方法。以推导从三者到残差的传递函数表达式为主要方法,以线性矩阵不等式为工具,把指标化为可求解模型,得到多指标下的故障检测滤波器设计方法。设计的滤波器应用于采用喷气执行机构的在轨卫星模型里,给出了滤波器的设计结果。从仿真的结果看,虽然三个增益无法满足同时远远小于1的条件,但通过自适应的阈值,可实现对在轨喷气执行器卫星的鲁棒故障检测。     

基于PXI总线的实时综合测试系统研究

为提高现有卫星测试系统的效率,对基于PXI总线的实时综合测试系统进行了研究。给出了测试系统的中央控制台、实时测试仿真单元和控制输出单元和辅助测试装置主要硬件构成,以及任务管理、实时测试仿真单元、控制输出单元和显示终端等软件组成。介绍了系统的工作原理,以及实时测控、多平台间实时数据共享交互等关键技术。结果表明,该系统从实时测试仿真单元信号采集至仿真运算结束的时间约1~10 ms。     

虚拟桌面技术研究与应用

IT技术的发展使得计算机的硬件系统环境与用户的实际使用环境相互分离,为了实现用户可以对计算机系统进行远程维护和管理,同时在节约计算机系统管理成本、降低设备功耗和提高可管理性方面,虚拟桌面技术能够很好满足这些需求。主要分析虚拟桌面技术的关键技术以及解决方案,并对虚拟桌面技术进行展望。     

静电悬浮微加速度计高灵敏度电容检测通道设计

高灵敏度电容式位移检测是实现静电悬浮微加速度计闭环测控的关键技术之一.针对微加速度计径向悬浮检测的特点及指标要求,设计了高灵敏度、高精度电容式微位移检测通道.该通道主要由前置RC隔离网络与C/V转换、高共模抑制比差动放大器、二级运放、二阶压控电压源有源带通滤波、相敏解调(含模拟乘法器与四阶Butterworth低通滤波...     

Mineral mapping in the Kap Simpson complex,central East Greenland,using HyMap and ASTER remote sensing data

This research focuses on the application of HyMap airborne hyperspectral data and ASTER satellite multispectral data to mineral exploration and lithologic mapping in the Arctic regions of central East Greenland. The study area is the Kap Simpson complex in central East Greenland. The Kap Simpson complex is one of the largest exposed Palaeogene felsic complexes of East Greenland. It has been the target of several mineral exploration projects. The analysis of the HyMap data produced a detailed picture of the spatial distribution of the alteration minerals in the Kap Simpson complex, unavailable from field-based studies in the area. The analysis of the ASTER data produced mineral maps which due to the moderate spatial and spectral resolution of the ASTER imagery can be useful for reconnaissance level mineral exploration. Colour composites of the mean normalized ASTER thermal bands display lithological information and detected a large felsic igneous intrusion that has not been shown on the recently compiled geological maps of the area. The results of this research have considerable potential to evaluate the use of hyperspectral and multispectral remote sensing for geological purposes in the Arctic regions of central East Greenland.     

基于Kalman滤波器的卫星钟实时异常监测算法

基于卫星钟钟差的Kalman滤波器模型,提出了一种卫星钟实时异常监测算法,对算法原理进行了讨论,并利用IGS精密钟差数据,对算法进行了性能验证。结果表明：该算法对卫星钟的异常情况（包括单点相位跳变与连续相位跳变）可以进行有效监测,同时还可以完成异常数据的剔除与替换,并且具有较小的替换误差。该算法具有显著的实时性,可以应用于星载原子钟的实时异常监测中。     

Spin parameters of nanosatellite BLITS determined from Graz 2 kHz SLR data

The nanosatellite BLITS (Ball Lens In The Space) is the first object designed as a passive, spherical retroreflector of the Luneburg type, dedicated for Satellite Laser Ranging (SLR). The 2 kHz SLR station Graz measures spin parameters of this satellite, providing information about the rotational dynamics of the body. The measurements obtained during the period from September 26, 2009 to November 24, 2010 show a significant change of the spin configuration. The spin axis was dynamically precessing since the launch and currently is sinus-like behaving between coordinates RA 120°…150°, Dec 30°…60° (J2000 inertial reference frame). The angle between the symmetry axis and the spin axis of BLITS is not constant, but is decreasing since the launch, while its spin period is rather stable with a mean value of 5.613 s (clockwise rotation). The satellite was dynamically changing its attitude during the first three months after deployment; after this time the spin parameters are relatively stable.     

Economic effect of satellite communications based on the Great East Japan Earthquake

On 11 March 2011, an undersea earthquake of magnitude 9.0, the largest ever recorded in Japan, occurred off the Oshika Peninsula on the Pacific coast of the Tohoku region. The hypocentral region extended for 500 km in the north–south direction from Iwate Prefecture to Ibaraki Prefecture, and for 200 km in east–west direction. The earthquake generated a tsunami with a height of more than 10 m and a run-up height of up to 40.0 m in certain places, which inflicted devastating damage on the coastal areas of the Tohoku and Kanto regions. In addition to the tsunami, the earthquake caused shaking, liquefaction, subsidence, and the collapse of dams, causing major damage to vast areas in the Tohoku and Kanto regions and disrupting various types of infrastructure, including communication. In light of this unprecedented damage, satellite communications were important from various perspectives while terrestrial communications systems were damaged, and an objective evaluation of the role played by satellite communications is relevant to its future installation, adoption and use as a standalone or backup system. Furthermore, satellite communications can help reduce the extent of damage, particularly damage to communications systems, inflicted by strong earthquakes in the future. Accordingly, we report a preliminary quantitative evaluation of the role of satellite communications in the Great East Japan Earthquake, of the role of satellite communications if it becomes widespread, and of its expected role in future large-scale earthquakes in terms of the economic effect converted into cost.