嫦娥二号探测器在轨运行视景仿真系统的研究与实现

针对嫦娥二号探测器在轨运行阶段的仿真需求,充分发挥视景仿真的优势,利用嫦娥一号探测器获得的地形和影像数据、日地月嫦娥二号探测器星历数据,基于OSG(OpenScene Graph)设计了针对嫦娥二号任务的在轨运行视景仿真系统。论述了该系统的开发平台,系统总体框架,并对系统的实现进行了详细描述。论述了月球模型数据构建,嫦娥二号探测器构建,星历数据库构建与访问,仿真实体空间位置的实时更新,CCD立体相机探测过程的仿真,视点的控制等实现方法。仿真结果表明系统完全能满足嫦娥二号任务在轨运行仿真的要求,并已应用于嫦娥二号任务执行过程中。     

撞击坑识别方法综述

目前国内外有多种撞击坑识别方法,在一定程度上实现了对撞击坑的识别提取,但是其准确性以及对数据的适应性不尽相同。首先对撞击坑识别研究进展进行概述,再对撞击坑识别方法进行归纳总结,指出不同方法的优缺点和适用条件。最后,对撞击坑识别研究存在的问题进行分析,提出了研究撞击坑识别的重点及解决途径。     

嫦娥一号图像数据处理与全月球影像制图

“中国首次月球探测工程全月球影像图”是我国第一幅覆盖月球的遥感影像图, 将成为嫦娥工程后期探测和月球科学研究的重要基础图件. 详细介绍了嫦娥一号CCD图像数据的获取、数据特点和数据质量, 描述了图像数据的处理方法和流程, 按制图规范对图像数据进行了镶嵌拼接和处理, 制作了覆盖全月球的1:250万比例尺影像图, 并进行了影像图的定位精度分析. 数据处理和制图结果表明, 嫦娥一号CCD数据及其定位精度能够满足1:250万比例尺的制图要求, 制作的“中国首次月球探测工程全月球影像图”, 其相对定位精度优于240 m, 平面定位精度约为100 m~1.5 km, 定位精度略好于2005联合控制网(ULCN2005)和克莱门汀基础地图(2.0版); 对所有像元进行了逐一光度校正, 大大改善了全球图像的一致性, 是目前覆盖最全、图像质量最好、定位精度最高的全月球影像图.     

地基雷达技术及其在太阳系天体探测中的应用

人类利用雷达波进行天文研究距今已有40多年历史了.它是一种发射雷达波到目标天体,通过分析其回波特性来进行天文探测的技术.该文从地基雷达在太阳系天体探测中的应用出发,分析了地基雷达相比其他探测手段的优点;介绍了地基雷达的基本工作原理;给出了近年来地基雷达的发展情况和探测成果;最后从现有条件出发,探讨了我国开展地基雷达探测的设想.     

黑龙江省移动应急气象服务系统设计

黑龙江省移动应急气象服务系统是通过亚洲Ⅱ号和Ⅳ号通信卫星与国家气象信息中心通信主站进行连接,主站通过中国气象局宽带网络系统与黑龙江省气象信息中心接通．实现在黑龙江省行政区内灾害地点快速组网,在现场快速构建气象服务平台,实现应急现场直接与黑龙江省气象台或全国天气预报电视会商系统接入的各分会场进行视频会商。及时准确地把突发事件现场监测的气象要素及现场背景资料上传给省气象台和后方指挥中心。确保现场天气的准确预报和重大事项的决策。同时还具备与其它气象监测系统的通信组网能力。     

面向移动端月球形貌展示的快速三维地图平台搭建

受限于移动设备运算能力和三维地图数据网络传输速度,如何在快速移动端流畅地显示月球三维地图,展示月球形貌细节,还是一个难点。为解决这一问题,本文首先考察已有的移动端三维地图实现方法,在此基础上研究了一种基于前后台异步渲染策略的三维月球地图实现方案;基于嫦娥月球数据,构建了一个月球三维形貌地图原型系统,并成功应用于移动端的嫦娥月球三维形貌数据发布。     

Geochemistry and chronology of the Jiehekou Group metamorphic basic volcanic rocks in the Lüliang Mountain area,Shanxi, China

Samples were systematically collected from metamorphic basic volcanic rocks in the Jiehekou and Xiyupi areas on both sides of the Lüliang Mountains, Shanxi Province and analyzed for their major elements, trace elements and rare earth elements (REE). The geochemical characteristics of their major, trace and rare-earth elements indicated that the metamorphic basic volcanic rocks in this area were emplaced in the tectonic environment like a modern continental rift. Sm-Nd and Rb-Sr isotope chronological studies demonstrated that the Jiehekou Group metamorphic basic volcanic rocks were formed during the 2600-Ma crust/mantle differentiation event, and were transformed by granulite facies metamorphism during the late Neo-Archaean period (2500 Ma ±), making the Sm-Nd systematics of the rocks reset. During the late Paleoproterozoic period (1800 Ma ±) the Rb-Sr systematics of the rocks were disturbed again in response to the Lüliang movement. Since the extent of disturbance was so weak that the Sm-Nd systematics was not affected, the age of 1600 Ma ± obtained from this area seems to be related to local magmatic activities within the craton. Research results lend no support to the idea that the Lüliang Group was formed during the Archaean. Instead, it should be formed during the Proterozoic.     

延庆数字地震台阵及其观测新技术

为了对地震震源过程和震源区的细结构进行详细的研究，并在减轻北京地区地震灾害方面作出贡献，中国地震局和德国联邦地球科学和自然资源研究院于2000年开始进行一项“中—德地震科技合作流动台阵近场地震观测和北京地区防震减灾”的地震科研课题（王培德，陈运泰，2001）。在这个课题中，由德国联邦地球科学和自然研究院（BGR）提供9台宽频带数字地震仪构成流动台阵，在中国进行观测。该台阵布设在北京西北的延庆地区，称为延庆数字地震台阵。延庆数字地震台阵使用了一些国际地震观测技术中的新技术，本文对延庆数字地震台阵进行一些介绍…     

Design and Implementation of Space Dust Database

Space debris is very dangerous to the security of on-the-orbit spacecrafts, and it is increasing in number at high speed with the expansion of human space exploration. Space debris has become a serious space pollutant noticed by many astronomers. The increase of space dust sources and the development of research on space dust urgently need space dust data sharing and exchanging. It is necessary for us to establish the Space Dust Database to realize the sharing and canonical management of the data. The Space Dust Database (SDD) management system,based on the 3-layer B/S computer mode, was designed and implemented in this paper. The system‘s features include significantly improved runtime efficiency, good scalability and maintainability. The Space Dust Database can pTovide some scientific bases for the study of the chemical constituents, mineral composition, origin and sources of space dust, but also provide excellent data services and decision-making support for the protection of space and model construction of space dust.     

Study on the earthquake fault of the Lulong ML=6.2 earthquake by precise relocation of aftershock

Introduction The Lulong county is about 75 km northeast to Tangshan in Hebei Province. An earthquake of ML=6.2 took place on October 19, 1982 about 4 km northeast to the county town. The epicenter of the mainshock is located at 39°57′N, 119°04′E by the Beijing seismic network. The 1976 Tang- shan 7.8 earthquake and the successive Luanxian 7.1, Ninghe 6.9 and the Lulong earthquake spread in NE-SW direction in space. SONG and WANG et al of Institute of Geophysics, China Seismolog…