基于用户和卫星概略位置的信号传播时延估计

辅助长码直捕的一个最重要的先验信息是时间信息,卫星信号传播时延估计是减少时域搜索范围的一个重要方面。针对地面静止用户,给出了基于用户和卫星概略位置的卫星信号传播时延估计算法,并指出用户和卫星位置误差对传播时延的影响可以分离计算。数值计量考印,即使用户和卫星的位置误差均达到1000km,也能将传播时延不确定范围压缩一半。     

国家安全地球物理学的若干研究方向

世界多极化和经济全球化是一种必然趋势,和平与发展虽然是主流,但我国国家安全形势不容乐观,同样面临严峻的挑战.与国家安全相关的地球物理学研究领域很广,主要涉及空间物理学、大气物理学、军事海洋学、空间遥感物理与监测和固体地球物理学.在这些领域中存在众多需要解决的问题,本文列举了一系列亟需研究的重要问题.在此基础上,笔者归纳出国家安全地球物理学的若干研究方向是：（1）具有明显或潜在国家安全应用价值的地球物理理论、方法技术研究;（2）国家安全地球物理装备（仪器）设施研究;（3）国家安全地球物理学中的数据处理理论、方法和技术研究;（4）重大国家安全地球物理学问题研究.由于国家安全地球物理学的研究任务多种多样、且各有侧重,如海、陆、空和二炮,都有各自的研究重点,不能一概而论.以二炮部队所涉及的军事地球物理学研究而论,研究方向应包括：（1）军事情报侦测保障中的地球物理问题研究（包括侦测与反侦测）;（2）作战运用与保障（测地、气象、空间天气、遥感）中的地球物理问题研究;（3）与战略导弹部队作战相关的地球物理武器和地球物理战研究;（4）国防工程中的地球物理应用研究.     

军事工程选址决策支持系统概念设计

本文主要介绍军事工程选址决策支持系统开发的思路和方法,目的在于解决军事工程选址过程中利用计算机提供决策支持的方法。本文主要从军事工程选址决策支持系统的设计思路、决策过程、模型的建立、数据的获取、人机界面及基于GIS的应用等方面予以介绍。本文利用军事港口M的选址问题,着重于介绍系统开发的理论方法和实现过程。     

地方武装部气象保障系统

针对保定武装部对气象信息的特定需求，根据需求内容、需求时间、需求环境等，利用PHP和MySQL、Dreamweaver等工具开发了一个基于PHP和MySQL的Web数据库的气象保障系统。运用PHP高级分页技术、访问MySQL数据库技术、图像处理技术等，采用了Web浏览器、Web服务器、数据库服务器3层结构方式研发。根据服务要素的特性划分为不同的功能模块进行制作，实现了各类信息自动更新，动态实时显示天气预报、天气实况、卫星云图等气象信息。实现了数据库资源在Internet的共享访问，搭建了信息交互访问平台，形成了完整、实用的气象保障服务系统。     

基于大型无人机的气象探测系统设计应用

利用高空高速大型无人机自身优势,设计一种基于大型无人机的新型气象探测系统,旨在丰富气象探测技术手段,提高气象探测的准确性.为了实现高空远距气象探测功能,对系统的组成、接口、控制逻辑等进行逐一设计优化,并创新地采用螺旋运转结构,大幅增加气象任务载荷数量,使单个吊舱可装载24枚探空仪.作为一项军民融合的典型应用,本气象探测...     

DISARMING NATURE: CONVERTING MILITARY LANDS TO WILDLIFE REFUGES*

Since 1988 the United States has closed nearly two dozen major military installations and reclassified them as national wildlife refuges. By presenting a case study of one site of military‐to‐wildlife conversion, this article examines the formation of these places and the implications of casting military practices and environmental conservation as compatible activities. As lands where military and environmental attributes can be perceived as inseparable, military‐to‐wildlife sites exemplify hybrid geographies that challenge dualistic notions of nature and society.     

GIS analysis of the trafficability determined by slope in the eastern Tyrol front (WWI,Eastern Alps): a military history reading

In the autumn of 1914, Austria-Hungary began to prepare for the possibility of an Italian offensive by building field fortifications, which formed the Tyrol Defense Line (TDL). Mountainous areas, such as the area of the TDL, present obstacles to trafficability in large part caused by terrain slope. On the eastern Tyrol front, steep slope obstructed trafficability when the Italians attacked the TDL and represented, in turn, an advantage for the Austro-Hungarian defense. This paper focuses on the assessment of the conditions of trafficability determined by slope in the eastern Tyrol front, using a GIS cost distance analysis. Key sources were the maps of Austrian and Italian official histories, parameters derived mainly from Marinelli’s slope classification, and from the interpretation of the particular historical circumstances. The advantages and disadvantages were considered from the perspective of the defensive and offensive and their significance for the history of this conflict. In particular, these were related to the perimeter to be defended by alternative Austro-Hungarian lines.     

Education

The goal of this article is to analyse several aspects of the construction of a unique project in cartography: the three-dimensional model of the city of Cadiz constructed between 1777 and 1779. Cadiz was the most important fortification in Spain at the time. We focus on new investigations of the two documentary sources relating to the construction of this maquette, or relief map, which hitherto have not been studied in conjunction. This approach facilitates an elucidation of the details of the production of the relief map that benefits from improved knowledge regarding materials, tools, construction techniques and the cost of preparing the model. Additionally, new conclusions are drawn regarding the true utility of maquettes at court and the possible causes of the sudden cancellation of this military project.