四渡河特大桥GPS控制网的布设及成果分析

介绍四渡河特大桥GPS控制网,采用一种新颖的平差计算方式,解决了与周边控制网的接边精度问题,解决了大山区大高差对GPS施工控制网的精度影响。实际验证了国产单频静态GPS接受机,也能进行高精度的施工控制测量。     

武汉天兴洲长江大桥市政配套工程测量技术方案

武汉天兴洲大桥是武汉市继长江大桥之后又一座大型公铁两用大桥,两岸市政配套工程属大型市政工程,详细介绍了它的控制测量和地形测量技术方案及产品的检查验收,为类似工程的测量方案提供借鉴。     

Hyper Redundancy for Accuracy Enhancement in Automated Close Range Photogrammetry

A generic network design in close range photogrammetry is one where optimal multi-ray intersection geometry is obtained with as few camera stations as practicable. Hyper redundancy is a concept whereby, once the generic network is in place, many additional images are recorded, with the beneficial impact upon object point precision being equivalent to the presence of multiple exposures at each camera position within the generic network. The effective number of images per station within a hyper redundant network might well be in the range of 10 to 20 or more. As is apparent when it is considered that a hyper redundant network may comprise hundreds of images, the concept is only applicable in practice to fully automatic vision metrology systems, where it proves to be a very effective means of enhancing measurement accuracy at the cost of minimal additional work in the image recording phase. This paper briefly reviews the network design and accuracy aspects of hyper redundancy and illustrates the technique by way of the photogrammetric measurement of surface deformation of a radio telescope of 26 m diameter. This project required an object point measurement accuracy of σ  = 0·065 mm, or 1/400 000 of the diameter of the reflector.     

中国-日本绝对重力仪器测量比对结果

本文给出了中科院测地所FG5-112和日本京都大学FG5-201及日本国土地理院FG5-104等几台绝对重力仪在武汉九峰和香港天文台绝对重力测量比对结果。分析说明不同仪器间具有良好的一致性,其中FG5-112与FG5-104结果间的互差达8×10-8m/s2;FG5-112与FG5-201和FG5-104等的观测互差小于2×10-8m/s2。这种比对观测,可为深入了解仪器性能和精确测定不同台站重力非潮汐变化提供可靠参考。     

航天INSAR复影像对的自动快速匹配

针对航天INSAR主、辅影像数据的特点，提出了加大匹配窗口、加大锚点间隔的匹配策略，以提高匹配的可靠性和速度。在匹配过程中，综合利用轨道参数和强度影像金字塔进行粗匹配，并对强度影像采用相关系数与最小二乘相结合的双向匹配方案，实现了自动、快速、高可靠性和高精度的航天INSAR复影像匹配。最后总结了航天INSAR复影像匹配的特点。     

有限元法逼近局域大地水准面的数学模型

顾及到大地水准面的物理特性,依据其在局部所应满足的数学物理方程,讨论了有限元法逼近局域大地水准面的数学思想,给出了相应的数学模型.     

Methods for Setting up a Three-Dimensional Industrial Surveying System of “Building Blocks Type”

1　Methodsfororientatinginitialdirec tioninindustrialsurveyDifferentfromconventionalengineeringsurvey,thedistancebetweenthetwoangle measurementdevicesinindustrialsurveyisnomorethantenmeters.Theaccu racyforthemeasurementofobjectpointsisrequiredtobebetween± ( 0 .0 2～ 0 .0 5～ 0 .2 0 )mm ,sotheaccu racyfortheorientationoftheinitialdirectionoughttobehigh .Theexistingmethodsfororientatingtheinitialdirectionbetweenthetwoangle measurementdevicesincludemethodofusinginnertarget,collimatormethod,metho…     

工业测量数据的可视化方法研究

简要介绍了测量获取离散点数据的一般手段，阐述了3维曲面重建的NURBS方法和空间Delauany三角剖分方法，简要说明了使用OpenGL进行3维开发的机制，并给出了3维空间交互和查询的实现步骤。为有效地发掘测量数据潜在的信息和规律提供了一条新的途径。     

用切贝谢夫配点法消除地球自振常微分方程组在地心处的奇异性

用切贝谢夫配点法求解地球自振常微分方程组,无需进一步改化即可消除这组方程在地心处的奇异性,并能获得高精度的结果。     

精密三角高程测量严密计算的理论研究与初步实验

本文根据水准面、似大地水准面、参考椭球面、高程异常、垂线偏差与正常高之间的关系，推导出了新的普通三角高程测量及光电测距三角高程测量的精密计算公式，并对新公式进行了初步的实验验证。