基于D-InSAR技术的伊朗巴姆地震地表形变监测   总被引：1，自引：1，他引：0  

寇程  柯长青 《震灾防御技术》2013,8(1):72-80

以伊朗巴姆地区为例,对伊朗巴姆地震造成的地表形变进行了差分干涉测量,得到了垂直向的同震三维形变场,并运用GIS三维分析技术对形变场进行了分析。实验结果表明,地震在巴姆城市的东侧造成了较大形变,在西侧也产生了微量形变。巴姆城市北部地块沉降,南部地块隆起。同时在巴姆城市南部可明显看到地震造成的断层。实验结果验证了基于C波段的SAR数据的D-InSAR技术在干燥地区监测地表形变方面的可行性。本文对产生去相关效应的原因进行了解释,认为对于干燥少植被的地区干涉效果较好。并指出,如果能够通过技术进步提高雷达干涉测量的精度并降低观测成本,同时将该技术与GPS、GIS等技术相结合,从而更好地研究形变机理,这将对地质灾害的研究产生重大意义。  相似文献   

DEFPOS and Its First Results     

M.ahan  .Yeingil  N.Aksaker    .Kιzιolu  M.Akyιlmaz 《中国天文和天体物理学报》2005,5(2):211-220

A spectrometer was built to examine the interstellar medium (ISM) using the hydrogen Balmer a line. It is called Dual Etalon Fabry-Perot Optical Spectrometer (DEFPOS). DEFPOS will be coupled to coude exit of the 150 cm telescope (RTT150) installed at TUBITAK National Observatory (TUG). DEFPOS was ready for observations about two years ago, but work was still continuing on the RTT150 coude exit alignment. So we have started observing HII regions with DEFPOS without the RTT150. We present here some characteristics of the instrument and some of the results obtained.  相似文献   

Contaminants in ATCA baselines with shadowing: a case study of cross-talk in short-spacing interferometers     

Ravi Subrahmanyan  Avinash A. Deshpande 《Monthly notices of the Royal Astronomical Society》2004,349(4):1365-1380

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星载SAR干涉技术最新研究进展   总被引：1，自引：0，他引：1  

陈艳玲  黄珹  丁晓利  李志伟 《天文学进展》2006,24(4):296-307

简要介绍了SAR、InSAR、D-InSAR的发展概况,以及InSAR、D-InSAR的基本原理．重点讨论了InSAR、D-InSAR技术的最新理论及存在的问题,包括多基线SAR干涉技术、极化干涉技术、大气效应的削弱、永久散射体方法、InSAR与LIDAR和GPS等数据源的融合技术,以及InSAR并行算法等。详细论述InSAR、D-InSAR技术在地球科学及气象学等领域所取得的最新进展。最后对InSAR技术的发展前景作了展望。  相似文献   

High dynamic range imaging by pupil single-mode filtering and remapping     

G. Perrin  S. Lacour  J. Woillez  É. Thiébaut 《Monthly notices of the Royal Astronomical Society》2006,373(2):747-751

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The coupling performance of photonic crystal fibres in fibre stellar interferometry     

J. Corbett  A. Dabirian  T. Butterley  N. A. Mortensen  J. R. Allington-Smith 《Monthly notices of the Royal Astronomical Society》2006,368(1):203-210

Large mode area (LMA), single-mode photonic crystal fibres (PCFs) have the potential to provide significant instrumental advantages in fibre stellar interferometry, due to their broad-band attenuation spectrum, endlessly single-moded performance and very large core size. We investigate the theoretical performance of coupling the telescope point spread function directly into LMA PCFs. We find that a single LMA fibre can replace as many as three step-index fibres for atmospheric seeing characterized by   D _T/ r _o≥ 2  with approximately the same coupling performance and a slower feed from the telescope. This could lead to considerable simplification of broad-band fibre interferometers.  相似文献   

Comparison of Fourier and model-based estimators in single-mode multi-axial interferometry     

E. Tatulli  J.-B. LeBouquin 《Monthly notices of the Royal Astronomical Society》2006,368(3):1159-1168

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A distorted radio shell in the young supernova SN 1986J     

M. A. Pérez-Torres  A. Alberdi  J. M. Marcaide  J. C. Guirado  L. Lara  F. Mantovani  E. Ros  K. W. Weiler 《Monthly notices of the Royal Astronomical Society》2002,335(1):L23-L28

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First‐year sea ice spring melt transitions in the Canadian Arctic Archipelago from time‐series synthetic aperture radar data, 1992–2002     

J. J. Yackel  D. G. Barber  T. N. Papakyriakou  C. Breneman 《水文研究》2007,21(2):253-265

This paper synthesizes 10‐years' worth of interannual time‐series space‐borne ERS‐1 and RADARSAT‐1 synthetic aperture radar (SAR) data collected coincident with daily measurement of snow‐covered, land‐fast first‐year sea ice (FYI) geophysical and surface radiation data collected from the Seasonal Sea Ice Monitoring and Modeling Site, Collaborative‐Interdisciplinary Cryospheric Experiment and 1998 North Water Polynya study over the period 1992 to 2002. The objectives are to investigate the seasonal co‐relationship of the SAR time‐series dataset with selected surface mass (bulk snow thickness) and climate state variables (surface temperature and albedo) measured in situ for the purpose of measuring the interannual variability of sea ice spring melt transitions and validating a time‐series SAR methodology for sea ice surface mass and climate state parameter estimation. We begin with a review of the salient processes required for our interpretation of time‐series microwave backscatter from land‐fast FYI. Our results suggest that time‐series SAR data can reliably measure the timing and duration of surface albedo transitions at daily to weekly time‐scales and at a spatial scales that are on the order of hundreds of metres. Snow thickness on FYI immediately prior to melt onset explains a statistically significant portion of the variability in timing of SAR‐detected melt onset to pond onset for SAR time‐series that are made up of more than 25 images. Our results also show that the funicular regime of snowmelt, resolved in time‐series SAR data at a temporal resolution of approximately 2·5 images per week, is not detectable for snow covers less than 25 cm in thickness. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

Internal solitary waves in the East China Sea     

LI Xiaofeng  ZHAO Zhongxiang  HAN Zhen  XU Liuxiong 《海洋学报(英文版)》2008,27(3):51-59

A European Space Agency＇ s ENVISAT advanced synthetic aperture radar （ASAR） image covering Zhejiang coastal water in the East China Sea （ECS） was acquired on 1 August 2007. This image shows that there are about 20 coherent internal solitary wave （ISW） packets propagating southwestward toward Zhejiang coast. These ISW packets are separated by about 10 kin, suggesting that these ISWs are tide-generated waves. Each ISW packet contains 5-15 wave crests. The wavelengths of the wave crests within the ISW packets are about 300 m. The lengths of the leading wave crests are about 50 km. The ISW amplitude is estimated from solving KdV equation in an ideal two-layer ocean model. It is found that the ISW amplitudes is about 8 m. Further analysis of the ASAR image and ocean stratification profiles show that the observed ISWs are depression waves. Analyzing the tidal current finds that these waves are locally generated. The wavelength and amplitude of the ECS ISW are much smaller than their counter- parts in the South China Sea （SCS）. The propagation speed of the ECS ISW is also an order of magnitude smaller than that of the SCS ISW. The observed ISWs in the ECS happened during a spring tide period.  相似文献