共查询到20条相似文献,搜索用时 15 毫秒
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S. F. El-Hakim 《The Photogrammetric Record》1999,16(93):547-553
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本文在讨论DDE技术的基础上,对MapInfo、VB的DDE机制的实现作了探讨和分析,根据校级区域GIS工程的实际开发研究工作,简要地介绍了利用DDE技术,在MapInfo下,利用高级语言VB,达到数据处理的实时动态。 相似文献
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空间前方交会测量中,基线长及基线方向值的误差对所有观测点的坐标影响是系统性的。本文提出一种方法,利用空间交会测量中的多余观测,可以精确计算出这些系统误差,同时在交会点的坐标中也消去了基线误差的影响。 相似文献
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The first development stages of the low cost, PC based, near real time photogrammetry system, PHOENICS, are discussed. Hardware and software components are described and planned system enhancement stages are sketched out. Concepts employed for target detection and analysis are briefly discussed. A target centre detection technique in which a combination of original and thresholded image is employed and a target design especially suited for thresholding techniques are presented. The introduction of parallel processing hardware into PHOENICS during the enhancement phase is explained. Accuracies achieved in first experiments with the prototype of PHOENICS are reported. 相似文献
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如何提高惯性测量的精度,是惯性测量工作者面临的主要问题。本文首先对目前惯性测量系统中采用的几种实时处理方法进行了分析和比较,提出一种改进的卡尔曼滤波算法。仿真结果表明:改进的卡尔曼滤波算法较卡尔曼滤波定位精度高。 相似文献
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本文讨论了处理动态数据的自适应卡尔曼滤波法,提出了适用于远海导航定位和近海导航定位的自适应最佳定位模型——EAF模型和PAF模型;为了满足实际海上航行的需要,研制了一个实用的海上动态定位系统——SDPS系统。 相似文献
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基于VRML三维动态虚拟现实场景的实现 总被引:5,自引:1,他引:5
本文分析了VRML与VR的关系。然后在简要介绍VRML的基础上,详细论述了用VRML构造3D虚拟现实模型及动态虚拟场景的方法及其关键技术,并举例以各应用进行了比较说明。最后总结了VRML的优缺点及其发展趋势。 相似文献
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利用过渡坐标系改进3维坐标变换模型 总被引:4,自引:4,他引:4
本文针对我国平面控制网与高程网分开布设的特点,借助于与站心坐标系指向一致的过渡坐标系,改进了计算坐标转换参数的常用模型。改进后的模型联合平面控制点的坐标和高程控制点的高程求解与其他3维空间坐标的7个转换参数,不需要3维已知点。并用算例说明了本文所提出的模型的优越性。 相似文献
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The use of CCD cameras for digital photogrammetry has only slowly been taken up by the photogrammetric community. However, the pace of change is quickening with better understanding and cheaper equipment. Recently a decision was made to start some research into close range three dimensional digital measurement. The overall objective was to develop a low cost system for the automated measurement of small industrial objects. This shorter contribution describes the initial stages of this work. 相似文献
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R. Wood 《The Photogrammetric Record》1972,7(40):454-465
A number of proposals have been put forward for the extraction of three dimensional data from a pair of electron microscope photographs taken from different angles. The methods used have, in general, been either point by point analyses or rather inconvenient. This paper shows that an existing photogrammetric plotter of topographic accuracy can, with very simple modification, be converted to give continuous plotting facilities from certain such micrographs. 相似文献
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本文讨论惯性测量系统的构成及工作原理,给出了惯性系统中常用的各种坐标系之间的转换关系,在此基础上重点讨论了捷联式惯性测量系统的特点,定位精度,给出了捷联式惯性测量系统的定位方程和计算状态参数的计算流程图,这些对这项技术用于列车实时定位的可能性提供了重要参考价值。 相似文献