基于灰关联分析的GPS高程拟合加权平均函数模型权函数优选

基于灰色系统理论的灰关联分析方法,提出了权函数的优选方法,实例分析表明其具有较好的实用价值.     

L1估计的分布及统计性质

推导了Ｌ１估计的密度函数,讨论了Ｌ１估计的统计性质,证明Ｌ１估计是无偏估计,同时还证明Ｌ１估计优于ＬＳ估计。     

An integrated wavelet concept of physical geodesy

For the determination of the earth's gravity field many types of observations are nowadays available, including terrestrial gravimetry, airborne gravimetry, satellite-to-satellite tracking, satellite gradio-metry, etc. The mathematical connection between these observables on the one hand and gravity field and shape of the earth on the other is called the integrated concept of physical geodesy. In this paper harmonic wavelets are introduced by which the gravitational part of the gravity field can be approximated progressively better and better, reflecting an increasing flow of observations. An integrated concept of physical geodesy in terms of harmonic wavelets is presented. Essential tools for approximation are integration formulas relating an integral over an internal sphere to suitable linear combinations of observation functionals, i.e. linear functionals representing the geodetic observables. A scale discrete version of multiresolution is described for approximating the gravitational potential outside and on the earth's surface. Furthermore, an exact fully discrete wavelet approximation is developed for the case of band-limited wavelets. A method for combined global outer harmonic and local harmonic wavelet modelling is proposed corresponding to realistic earth's models. As examples, the role of wavelets is discussed for the classical Stokes problem, the oblique derivative problem, satellite-to-satellite tracking, satellite gravity gradiometry and combined satellite-to-satellite tracking and gradiometry. Received: 28 February 1997 / Accepted: 17 November 1997     

输电线路测量辅助处理软件编制

采用VB 6.0并结合架空输电线路测量内业数据整理的特点,编制了输电线路测量辅助处理软件对测量数据进行编辑处理,生成各种成果表和归档资料,同时提供与架空送电线路软件的数据接口。该软件实现了架空输电线路内业数据处理自动化的,已在架空输电线路工程中得到广泛应用。     

警用电子地图基础平台的设计与研究

警用电子地图基础平台是利用空间地理信息技术,以电子地图为基础,以公安宽带网络为依托,实现公安基础信息基于空间电子地图的可视化查询和分析,为公安业务提供行之有效的管理手段。     

B/S党务信息管理系统方案研究与设计

电子党务信息管理系统是实现党务管理信息化、规划化的有效途径,能够辅助完成党务管理中的各项工作,本文在分析当前党务信息管理的前提下,给出了建设党务信息管理系统的总体结构框架设计及具体功能设计方案,为党务信息管理系统的建设提供思路。     

QuickBird影像的正射校正研究

根据现有的数据特点和项目要求,在Erdas软件中,对Quickbird影像提出了可行的正射校正流程,重点分析有理函数模型的数学推导和算法实现,最终解决在校正过程中遇到的问题。     

GPS接收机内部噪声水平测试方法研究

阐述了在GPS精度鉴定系统中,针对短基线快速检核GPS接收机内部噪声水平测试方法进行研究,并结合试验验证了方法的可靠性.     

逐点内插法建立DEM的研究

本文讨论了移动拟合法和加权平均法两种逐点内插法建立DEM的原理及算法实现,并对其中的关键技术——动态确定阈值R和权函数的确定与实现进行了详细讨论。文章在分析常规权函数的基础上提出了一种新的定权方法。最后通过大量试验数据对两种内插方法的精度以及不同权函数的精度分别进行了评定。