成像雷达干涉测量数据相关性与干旱-半干旱地区地表类型特征的关系     

廖静娟  邵芸  郭华东  N.Veneziani 《地球科学进展》2002,17(5):648-652

利用欧洲资源卫星1号和2号获取的重轨干涉测量雷达数据，首先进行干涉测量数据相关性估测，并结合干涉测量数据的振幅信息，开展新疆喀什试验区地表土地类型的识别与分类，区分和识别出裸土、盐碱地、灌丛、裸岩/戈壁、沼泽和水体 6类土地类型。最后通过对不同土地类型的后向散射特性和相关性的分析，探讨了干涉测量数据相关性与干旱-半干旱地区地表特征的关系。  相似文献   

Ground deformation of Nisyros Volcano (Greece) for the period 1995–2002: Results from DInSAR and DGPS observations     

E. Lagios  V. Sakkas  Is. Parcharidis  V. Dietrich 《Bulletin of Volcanology》2005,68(2):201-214

Differential GPS (DGPS) and Differential Interferometric Synthetic Aperture Radar (DInSAR) analyses were applied to the Kos-Yali-Nisyros Volcanic Field (SE Hellenic Volcanic Arc) to quantify the ground deformation of Nisyros Volcano. After intense seismic activity in 1996, a GPS network was installed in June 1997 and re-occupied annually up to 2002. A general uplift ranging from 14 to 140 mm was determined at all stations of the network. The corresponding horizontal displacements ranged from 13 to 53 mm. The displacement vectors indicate that the island is undergoing extension towards the East, West and South. A two-source “Mogi” model combined with assumed motion along the Mandraki Fault was constructed to fit the observed deformation. The best-fit model assumes sources at a depth of 5500 m NW of the centre of the island and at 6500 m offshore ESE of Yali Island. DInSAR analysis using four pairs of images taken between May 1995 and September 2000 suggests that deformation was occurring during 1995 before the start of the seismic crisis. An amplitude of at least 56 mm along the slant range appeared for the period 1996 through 1999. This deformation is consistent with the two-source model invoked in DGPS modelling. Surface evidence of ground deformation is expressed in the contemporaneous reactivation of the Mandraki Fault. In addition, a 600 m long N-S trending irregular rupture in the caldera floor was formed between 2001 and 2002. This rupture is interpreted as the release of surface stress in the consolidated epiclastic and hydrothermal sediments of the caldera floor.  相似文献   

Broadband synthetic aperture borehole radar interferometry   总被引：1，自引：0，他引：1  

I. Mason  N. Osman  Q. Liu  C. Simmat  M. Li 《Journal of Applied Geophysics》2001,47(3-4)

Trials in mines have established that wideband VHF borehole radars (BHR), working in the 10–100-MHz band, can be used to probe the rockmass between boreholes over ranges from <5 m to as much as 150 m with submeter resolution. There is evidence that ore bodies reflect these radar signals both specularly and diffusely, much as the ground/air interface does when overflown by synthetic aperture radar (SAR). In both SAR and BHR, multiple flight lines, together with diffuse reflections admit the possibility of developing interferometric 3D images of the object. This paper examines the possibility of imaging buried objects in three dimensions by interferometrically combining broadband VHF borehole radar profiles shot in adjacent pairs of boreholes. Broadbanding in BHR has the advantage of releasing the image from 2nπ phase ambiguities, but practically, interferometric borehole radar (InBHR) needs high signal-to-noise ratios (SNR) to avoid noise capture. This means that 3D InBHR is limited to ranges in wavelengths which are less than the rock's attenuation factor Q. Interferometric methods are developed which are capable of mapping ore bodies and other structures in three dimensions. Tangent plane migration methods are developed here in order to reconstruct surfaces that lie in the near-field of sparse interferometric arrays.  相似文献   

基于实测值分段线性内插模型的InSAR视线向同震位错分解-以青藏高原昆仑山MemＳsub8.1地震为例x,auto,auto,415px);}stylehf=httprztl.com business week launch   总被引：4，自引：0，他引：4       下载免费PDF全文

马超  单新建 《地震学报》2006,28(1):98-104

利用现场GPS定位的实测值，在尝试过最小二乘拟合并取得初步成果的基础上，进而采用更符合破裂带形态的线性立方插值函数，在破裂带主断面上，建立起一种理论与实测相结合的InSAR视线向(LOS)变化量的分解方程，得到了InSAR视线向位移分解的具有唯一性的解析解. 本文的解析法吸纳了GPS定点实测值的精度优势，利用InSAR全天候、准实时获取连续形变场的技术特点，通过数学近似，最终获得了主破裂带上连续变化的水平位错及垂直位错同震形变曲线.   相似文献   

巴姆地震变形场和应力场：Ⅰ．用差分干涉雷达和Okada方法求解   总被引：1，自引：0，他引：1  

凌勇 曾祺明罗扬  赵永红 《岩石学报》2006,22(9):2367-2374

本文对2003年12月26日伊朗东南部克尔曼省巴姆地区发生的6.6级地震产生的位移场、应变场和应力降分布进行了定量研究。首先从差分干涉雷达(D～InSAR)出发,求解出此次地震的同震干涉条纹和雷达视线方向的位移场,并从雷达干涉的相干图上清楚的观察到了发震断层的痕迹,得出此次地震的发震断层是巴姆断层以西的隐伏断层的结论。然后结合 Harvard 的 CMT(震源机制解)结果、Nakamura 的断层结果(Arg-e-Bam 隐伏断层)以及本文 D-InSAR 求解出的发震断层结果,利用 Okada 程序,计算出此次地震的北、东、垂向三个位移分量,投影得到雷达视线方向的位移,将投影结果与由 D-InSAR得到的位移场比较,看到我们所讨论的断层模式可以很好的解释差分干涉雷达的观测结果,可以合理的解释 Arg-e-Bam 隐伏断层为此次地震的发震破裂断层,通过分析地震的破坏程度分布图,隐伏断层为发震断层的解释可以很好的符合巴姆地震的等震分布图。最后,本文利用 Okada 程序计算得到了此次地震所产生的应变场和应力降场。  相似文献   

多尺度相关性分析的机载双极化InSAR轨道误差校正方法     

何永红  靳鹏伟  蒋陈纯 《地球信息科学学报》2021,23(4):670-679

在高分辨率机载干涉SAR成像处理过程中,由于载机飞行过程中偏离理想轨迹,需要高精度的惯导系统和GPS系统记录载机的运动轨迹并进行运动补偿。然而,由于目前传感器导航精度的限制,在完成运动补偿处理后仍然存在轨道误差,从而影响干涉相位的精度,本文提出了一种机载双极化InSAR轨道误差去除方法。该方法利用小波多尺度分析对不同极化方式差分干涉相位进行多尺度分解,减弱地形误差相位、噪声相位对轨道误差的干扰,然后根据不同极化方式轨道误差的高度相关性,对相位进行降权改正,得到轨道误差改正后的差分干涉相位。为验证该方法的可靠性,分别采用模拟数据和E-SAR P波段双极化数据进行实验分析,结果表明原始差分干涉图中的轨道误差剔除明显,利用P波段获得的校正干涉图生成数字高程模型(DEM),轨道误差改正前后获取的DEM与LiDAR值的均方根误差(RMSE)分别为6.02 m和1.68 m,提高了InSAR测高精度。本研究为机载InSAR轨道误差补偿提供了一种新的思路。  相似文献   

不同分布模式电离层对星载InSAR测高精度的影响及校正     

赵玲  周杨  靳国旺  薛武  许继伟 《测绘科学技术学报》2015,(3):288-293

电离层总电子含量(TEC)会使合成孔径雷达干涉测量(In SAR)信号产生相位延迟,进而影响生成DEM的精度,特别是对L和P等长波段信号的影响不可忽略。因此,针对不同TEC分布模式的电离层开展研究,构建了电离层对星载In SAR测高精度的影响模型,提出了相应的校正方法,并进行了仿真实验。实验表明对于特定波长的In SAR信号,不同TEC分布模式对In SAR测高精度的影响不同:TEC均匀分布的电离层模型对In SAR测高精度的影响较小,并可通过相位解缠、基线估计等环节进行很好的补偿;而TEC不均匀分布的电离层模型对In SAR精度的影响较大,仅靠相位解缠等过程不能较好地消除,必须通过向干涉图中加入电离层影响模型予以纠正。  相似文献   

An iterative PS-InSAR method for the analysis of large spatio-temporal baseline data stacks for land subsidence estimation     

《International Journal of Applied Earth Observation and Geoinformation》2019

South-west of Tehran, the capital city of Iran, is subjected to a high deformation rate due to excessive groundwater extractions. Persistent Scatterrer SAR Interferometry (PS-InSAR) technique is used to monitor Tehran’s deformation. Three time series data including two Sentinel-1A (S-1A) spanning from 2014 to 2017, and an ENVISAT-ASAR data stack spanning from 2004 to 2010, are analyzed. The PS-InSAR technique does not perform well on ENVISAT-ASAR due to poor selection of PS points induced by large perpendicular baselines and strong temporal decorrelation of the dataset. In this paper, a novel Iterative PSI method (IPSI) is proposed to increase the PS points which are lost in PS-InSAR technique because of the unsuccessful derivation of the absolute phase value due to an integer ambiguity. The method selects PS points based on simultaneous analysis of their amplitude and phase. Results demonstrate that the density of PSs has been increased by about 4.5 times. Line of Sight (LOS) velocities obtained from both S-1A and ENVISAT-ASAR data analysis are highly compatible with each other, indicating the reliability of the both applied methods. The maximum cumulative displacements are estimated as 39.6 cm and 88.4 cm for Sentinel-1A and ENVISAT-ASAR datasets respectively. Moreover, the subsidence area has grown in the period between the data acquisition time. The methods are successfully validated by subsidence rates obtained from precise leveling and GPS observations.  相似文献   

全干涉成像的微地震定位方法研究   总被引：1，自引：0，他引：1       下载免费PDF全文

田宵  张雄  张华  麻昌英  戴梦雪  储仿东 《地球物理学报》2020,63(8):3105-3115

基于偏移成像的微地震定位方法由于可避免走时拾取误差以及可实现自动化定位等优点被广泛应用.绕射叠加方法将能量沿走时曲线聚焦到空间网格点上,进行成像时需要搜索发震时刻.干涉成像方法利用互相关提取的走时差信息可避免搜索发震时刻,但定位结果受数据信噪比的影响较大.为了进一步提高干涉成像法的定位精度,本文提出一种同时使用互相关和自相关道集的全干涉成像方法,增加的自相关道集提取的S-P走时差可降低震源-检波器方向的定位误差,提高定位精度.单井监测的理论测试和实际数据的研究结果表明,全干涉成像的定位精度高于仅使用互相关道集的干涉成像方法,同时计算效率高于绕射叠加方法.  相似文献   

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刘斌  张景发  罗毅  姜文亮  李永生 《大地测量与地球动力学》2013,33(4):4-8

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