高精度正立方玻璃体干涉检测方案设计     

翁兴涛  李松 《武汉大学学报(信息科学版)》1998,(1)

锥体棱镜作为各种测距仪的附件，属高精度光学元件，且其精度高低对测距仪测距精度影响很大。不少生产厂家在加工中普遍采用先加工出一个正立方体，而后在顶角处斜切出锥体棱镜的加工方法。本文详细讨论了用干涉法检测正立方体各项质量指标，特别提出了利用封闭多边形内角之和恒定的原理消除干涉系统的系统误差，从而使对二面直角的测量可达极高精度。  相似文献   

On the application of SAR interferometry to geomorphological studies: estimation of landform attributes and mass movements   总被引：9，自引：0，他引：9  

Filippo Catani  Paolo Farina  Sandro Moretti  Giovanni Nico  Tazio Strozzi 《Geomorphology》2005,66(1-4):119

This paper presents two examples of application of Synthetic Aperture Radar (SAR) interferometry (InSAR) to typical geomorphological problems. The principles of InSAR are introduced, taking care to clarify the limits and the potential of this technique for geomorphological studies. The application of InSAR to the quantification of landform attributes such as the slope and to the estimation of landform variations is investigated. Two case studies are presented. A first case study focuses on the problem of measuring landform attributes by interferometric SAR data. The interferometric result is compared with the corresponding one obtained by a Digital Elevation Model (DEM). In the second case study, the use of InSAR for the estimation of landform variations caused by a landslide is detailed.  相似文献   

Interferometric/daylight seismic imaging   总被引：8，自引：0，他引：8  

G. T. Schuster  J. Yu  J. Sheng  J. Rickett 《Geophysical Journal International》2004,157(2):838-852

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Bam earthquake: Surface deformation measurement using radar interferometry   总被引：2，自引：0，他引：2  

夏耶 《地震学报(英文版)》2005,18(4):451-459

1 Basic principle of SAR and SAR-interferometry Synthetic aperture radar (SAR) is one kind of microwave side-looking imaging radar (Cur- lander and McDonough, 1991). In order to obtain an image for a large area, the carriers are many for the aerospace vehicle, like airplane, aerospace craft and satellite. As a result of its operational character, all-weather and high resolution, in the recent 20 years, SAR has obtained quicker de- velopment compared with an optical pickoff. Its applicati…  相似文献   

The 1994 Sefidabeh (eastern Iran) earthquakes revisited: new evidence from satellite radar interferometry and carbonate dating about the growth of an active fold above a blind thrust fault   总被引：2，自引：0，他引：2  

B. Parsons  T. Wright  P. Rowe  J. Andrews  J. Jackson  R. Walker  M. Khatib  M. Talebian  E. Bergman  E. R. Engdahl 《Geophysical Journal International》2006,164(1):202-217

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几种卫星合成孔径雷达影像配准算法的比较研究   总被引：8，自引：0，他引：8  

罗小军  刘国祥  黄丁发  丁晓利 《测绘科学》2006,31(1):19-21

复数影像配准是卫星合成孔径雷达干涉数据处理中的重要步骤之一,影像配准精度将直接影响干涉条纹图的质量和由此提取的高程或位移结果的精度。文中利用上海地区ERS-1/2影像数据进行实验,对比分析了三种方法的配准质量和运算效率,试验结果表明:在配准质量方面,相干系数法最高,相位差影像平均波动函数法次之;而在信噪比较低的情况下,最大频谱法的配准质量优于相位差影像平均波动函数法。在运算效率方面,相位差影像平均波动函数法的运算效率最高。  相似文献   

A new ultrasonic interferometer for the determination of equation of state parameters of sub-millimeter single crystals     

Hartmut A. Spetzler  Ganglin Chen  Scott Whitehead  Ivan C. Getting 《Pure and Applied Geophysics》1993,141(2-4):341-377

A new giga-Hertz ultrasonic interferometer has been developed, based on ultrasonic microscopy technology. The interferometer operates from 0.3 GHz to 1.5 GHz. The high frequency and associated small wavelengths together with the large bandwidth make it possible to measure travel times in samples with thicknesses of several microns and allow for unprecedented accuracy in bond corrections. An absolute accuracy of 1 part in 10⁵ in travel time measurements is achievable in single crystals (thickness of 200 microns) or glasses of interest to the earth sciences. The high precision travel time data, combining with sample length measurements using a laser interferometer built in our laboratory, yield very high precision ultrasonic velocities.The interferometer is intended for use in conjunction with a newly developed 4 GPa gas piston cylinder apparatus (Getting andSpetzler, 1993) for equation of state measurements under simultaneous pressure and temperature. A separate correction for the bond will be made for each datum at every point in temperature pressure space.  相似文献   

静地卫星定轨的模糊度及基线选址   总被引：3，自引：2，他引：3  

杜兰 郑勇张捍卫  陈勤勤 《测绘学院学报》2003,20(2):100-102

在短基线相位干涉法卫星定轨原理的基础上，分析了各主要误差源及其对相位模糊度计算的影响特性，指出目标卫星的初始轨道精度是影响模糊度解的主要因素；讨论了高稳定度的原子钟和共用本振方法以及近角距的较差观测对提高模糊度解的可靠性和精密定轨的积极作用。最后提出了综合有效率的概念，它可作为地面双基线布设及最优选址的参考依据。  相似文献   

极化干涉SAR数据地表土地类型分类   总被引：2，自引：0，他引：2  

李新武  郭华东  杨虎  王长林  廖静娟  范典 《遥感学报》2002,6(6):507-510

基于新疆和田地区1994年10月9日和10日SIR-C-L波段全极化雷达数据。首先对极化干涉测量的基本原理和数据处理流程进行了详细的阐述，接着，用Cloude相干最优算法得到了与3种地物散射机制相对应的3个最优相干图。并且就地物相干性对极化的强烈依赖和3种散射机制中地物的最优相干特性进行了分析，具有最高相干值的相位图在提取DEM方面较有利，具有最低相干值的相干图在地物识别方面较有利。最后，在对最优相干系数。后向散射系数和熵进行数据相关性分析基础上，利用得到的最优相干系数，熵和后向散射系数数据进行了土地类型的识别和分类，得到了很好的效果。  相似文献   

Seismological and SAR signature of unrest at Nisyros caldera, Greece     

M. Sachpazi  Ch. Kontoes  N. Voulgaris  M. Laigle  G. Vougioukalakis  Olga Sikioti  G. Stavrakakis  J. Baskoutas  J. Kalogeras  J. Cl. Lepine 《Journal of Volcanology and Geothermal Research》2002,116(1-2)

Nisyros island, a Quaternary volcanic center located at the SE of the Aegean Volcanic Arc, has been in the past characterized by periods of intense seismic activity accompanied sometimes by hydrothermal explosions, the last one being in 1887. The recent long lasting episode of unrest (1995–1998) in the area is the first instrumentally documented providing information on the behavior of the volcano. Evidence from seismicity and SAR interferometry suggests that the presently active part of the Kos–Nisyros volcano-tectonic complex is located at the NW coast of Nisyros island defining an area much smaller than the whole volcano-tectonic area. Seismicity patterns vary both temporally and spatially consistently with different rates of vertical ground deformation inferred from SAR interferometry. These observations help us to discuss the different elements controlling the behavior of the volcanic system such as: the existence, location and timing of magma chamber inflation, the occurrence of tensile failure at the boundaries of the chamber and the possibility of magmatic fluids being expelled to form a shallow magmatic intrusion, the seismic failure and migration of hypocenters indicating shallow magma transport.  相似文献