火星全球导航卫星系统

讨论了建立类地行星全球导航定位系统的意义,并对火星全球导航卫星系统星座的布构型进行了初步分析设计.对不同导航星座的覆盖特性与导航定位性能进行了评估,给出了最佳星座设计,它可以作为将来建立火星导航卫星系统的星座设计参考.     

A—SMGCS技术和应用介绍

近十年来，机场场面监视经历了从基于“看见与被看见”的原则进行导航，发展到目前的基于场面活动雷达的SMGCS（Surface Movement Guidance and Control System）系统。欧洲及美国的许多机场已经安装了基于模式S的SMGCS系统，但这些系统只是通过在车辆上安装基于雷达或GPS的模块，用于向监控中心发送本目标的位置信息，而相互之间没有手段进行信息的自主交流，所以只能在监控中心实现一定的监视功能，各个移动车辆之间并不能看到相对的位置信息等。     

光学主被动复合导引头及关键技术

红外成像探测，激光成像测距的光学主被动复合导引头工作波长短，具有良好的空间分辨率和速度分辨率，可大幅度提高对RV的识别距离、末制导精度及杀伤概率。简要介绍了国外光学主被动复合导引头的研发动态，基本原理及关键技术达到的水平。提出了跟踪研究的基本思路，途径及建议。     

Study on extraction of crop information using time-series MODIS data in the Chao Phraya Basin of Thailand

In order to acquire the crop-related information in Chao Phraya Basin, time-series MODIS data were used in this paper. Although the spatial resolution of MODIS data is not very high, it is still useful for detecting very large-scale phenomenon, such as changes in seasonal vegetation patterns. After the data processing a general crop-related LULC (land use and land cover) map, cropping intensity map and cropping patterns map were produced. Analysis of these maps showed that the main land use type in the study area was farmland, most of which was dominated by rice. Rice fields mostly concentrated in the flood plains and double or triple rice-cropping system was commonly employed in this area. Maize, cassava, sugarcane and other upland crops were mainly distributed in the high alluvial terraces. Because these area often have water shortage problem particularly in the dry season which can support only one crop in a year, the cropping intensity was very low. However, some upland areas can be cultivated twice a year with crops which have short growing seasons. The crop information extracted from MODIS data sets were assessed by CBERS data, statistic data and so on. It was shown that MODIS derived crop information coincided well with the statistic data at the provincial level. At the same time, crop information extracted by MODIS data sets and CBERS were compared with each other which also showed similar spatial patterns.     

物理学圣地——完美诠释哥本哈根精神

高度的智力活动、大胆的涉险精神、深奥的研究内容与快活的乐天主义"哥本哈根精神"是由20世纪初丹麦的著名科学家尼耳斯·玻尔所提出的,玻尔的挚友、著名物理学家罗森菲耳德为"哥本哈根精神"下的定义是:完全自由的判断与讨论的美德。不仅如此,玻尔倡导的"平等、自由讨论和相互紧密地合作的浓厚的学术气氛",已经成为放之四海皆宜的团队工作准则。只有在他积极营造的那种"使人感到繁忙、激动、活泼、欢快、无拘无束、和蔼可亲"的气氛中,"工作者"才会是美丽的。"哥本哈根精神"完美地诠释了团队精神,它以一个成功者的姿态存在:相互的沟通配合和较为明显的责任分担,需要更为统一的思想,对目标的认同和个人牺牲。     

Chirp雷达的两种有效积累算法的研究

分析了Chirp雷达系统中包络走动对积累检测的影响,然后提出了两种有效的积累算法:时移包络补偿积累算法和包络插值移位补偿积累算法,分析了其原理、步骤及运算量。仿真结果显示后者的性能要优于前者。这两种方法在低信噪比条件下都能够实现较长时间的有效积累。     

空中交通管理协同决策

CDM是一种基于信息交换及政府与企业之间联合协作的理念，用于创造更为安全和更为有效的系统环境。通过信息交换，所有参与各方就能对整个系统和所有运作限制产生一个公共的态势认知，在此基础上参与各方就能协调地做出更为安全有效的决策，同时也在最大程度上满足了各个企业的商业需求。     

用模型喷管模拟研究发动机组外向辐射传热

根据热辐射理论，分析空间发动机外向辐射会传热的基本特点，得出在地面用模型喷管－电热喷管缩比件模拟这一传热现象的必要条件为两者几何相似，壁面热流密度q以及表面黑度ε相等。可行性分析为地面模拟试验提供了科学的依据，其结论可用来指导试验。     

海参崴印象

“海参崴气候属温带季风性海洋气候，夏季潮湿，多雾，时有台风；秋季是海参崴最好的季节，天气晴朗，阳光充足，日照时间较长，是俄罗斯旅游度假胜地之一。”