Earthshine and Asteroseismology Telescope (East) Network

Several automated optical telescopes have been setup at appropriate longitudes around the globe to study earthshine variations and asteroseismology. The first telescope has been setup at Teide Observatory, Tenerife, Spain in October 2004. The intensity of earthshine relates to the average of Earth’s albedo, and in turn relates to the global temperature of the Earth. A global network is necessary because each site can measure the earthshine reflected from only a part of the Earth. The network will also be used for asteroseismology study. It can measure photometric variations of pulsating stars. The long-term and continuous measurements allow the accurate determination of mode frequencies of stellar pulsations, which provides information on the properties of stellar interior.     

谈"材料成型及控制工程专业"人才培养规格

材料成型及控制工程专业是机械热加工领域的新型专业,正确认识专业,确定人才培养规格是搞好专业建设的基础.     

轻型空间相机遮光罩组件的研制

文章介绍了空间遥感相机遮光罩的结构特点及其功能。重点介绍了一种用于可见-红外光谱仪上的轻型遮光罩,该仪器安装于2005年美国发射的火星勘测轨道飞行器(MRO)上。     

角分集ISAR高分辨成像

对不同视角雷达回波进行融合可以形成大的相干积累角,显著增强雷达空间监控能力。给出一种角分集(制)信号融合成像方法,对于角分集(制)回波方位向存在大的间隔,首先将每一距离单元方位向有效稀疏孔径数据排列组合成一Hankel矩阵,由参数化方法估计一维信号参数,再由估计得到的参数对空缺部分预测填补,对每个距离单元横向补全后,压缩得到二维图像。该方法克服了以往预测方法的不足,能有效用于方位向稀疏孔径预测外推,最终仿真与实际数据处理结果证实结论。     

摆动扫描地球敏感器数学模型及飞行试验结果

描述了东方红三号卫星(DFH-3)控制系统设计和数学仿真中采用的摆动扫描地球敏感器IRES-01的数学模型，东方红三号卫星近三年飞行试验结果与数学仿真结果基本一致，证明数学模型是正确的。     

低地球轨道环境原子氧对航天器表面材料聚酰亚胺作用的数值模拟

在建立数学物理模型的基础上，对氏地球轨道环境和地面实验环境下，有无保护层的聚酰亚胺所受原子氧冲蚀作用进行了进行了成功的数值模拟，获得了具有工程应用价值的数值计算结果，并讨论了数学物理模型中各参数对基蚀曲线形状的影响。从数值模拟结果和美国太空实验结果的比较可以看出，本文数据模拟的结果是正确的。该项工作对航天器的设计具有重要指导意义。     

星光折射航天器自主定轨方案比较

当星光透射大气发生折射时 ,用星光折射角精确地反映星光在大气中离地球表面的高度 ,并建立高度、航天器与地球的几何关系。通过对折射角进行观测 ,间接测得地平 ,从而改善了用地平仪直接测地平所造成的航天器自主导航精度低的不足。本文提出了几种利用星光折射的航天器自主定轨方案 ,并作了细致的仿真实验 ,对直接和间接两种测量地平方法以及几种星光折射自主定轨方案进行了分析比较。     

Ariane transfer vehicle in service of man in orbit

The Ariane transfer vehicle (ATV), an Ariane 5 borne, unmanned propulsion vehicle, is designed to transport the logistics needed to resupply the International Space Station (ISS) and the man tended free flyer (MTFF) step 2 with pressurized and unpressurized cargo and to dispose the waste. The ATV is an expendable vehicle and is disposed of by a safe atmospheric burn up. In accordance with the AR5 schedule it should be operational in 1996 for missions toward ISS and beyond the year 2000 for MTFF 2 missions. The main constituents of the proposed ATV are the modified AR5 third stage L5, an upgraded VEB steering the launcher as well as the ATV and the P/L-adaptor providing mechanical and umbilical links to the payload. The mechanical part of the RVD-kit will be placed on the payload-module, the main RVD sensors are located on the adaptor and the needed computer intelligence will be integrated on the VEB. To minimize the development, and recurring costs, the ATV concept fully complies to the idea of maximum use of existing hardware and software, mainly from the AR5, Hermes and Columbus programs thus minimizing development and recurring costs. The ATV is compatible to ISS, MTFF and OMV and is able to transport logistic modules compatible with NSTS and U.S.-expendable launchers.     

异步电动机的最小能量运行点

在异步电动机的一般数学模型基础之上，提出了本文使用的数学模型。和一般数学模型相比，此模型对异步电动机转子电阻的变化较不敏感。借助异步电动机的期望电磁转矩，推导出了参数化的状态运行点(定子电流和磁链在稳定状态下的值)一最小能量运行点，得到异步电动机的最小能量运行条件。     

开放式飞行任务规划方法

本文给出了一种基于分布式黑板结构的开放式飞行任务规划方法，简要叙述了飞行器飞行任务规划的概念和其独特要求，并对飞行任务规划的数据预处理、知识表达、规划方法作了深入的探讨。最后介绍了分布式黑板的结构和运行方式。