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This paper is focused on deformation monitoring using the Ground-Based SAR (GBSAR) technique and a particular data acquisition configuration, which is called discontinuous GBSAR (D-GBSAR). In the most commonly used GBSAR configuration, the radar is left installed in situ, acquiring data periodically, e.g. every few minutes. Deformations are estimated by processing sets of GBSAR images acquired during several weeks or months, without moving the system. By contrast, in the D-GBSAR the radar is installed and dismounted at each measurement campaign, revisiting a given site periodically. This configuration is useful to monitor slow deformation phenomena. This paper outlines the D-GBSAR data analysis procedure implemented by the authors. This is followed by a discussion of some specific aspects of D-GBSAR monitoring. Two successful examples of D-GBSAR monitoring are discussed: one concerns an urban area, while the second one involves a rural area where the monitoring requires the use of artificial corner reflectors. 相似文献
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地表形变D-InSAR监测方法及关键问题分析 总被引：2，自引：0，他引：2
总结和分析了地表形变D-InSAR监测的主要方法和当前所面临的主要问题。针对常规D-InSAR技术中大气相位和低相干区域相
位解缠，分别介绍了基于Delaunay三角网的不规则格网解缠方法、累积干涉纹图处理方法（Stacking Interferograms）、永久性
散射体（PS）技术以及角反射器干涉测量（CR-InSAR）方法，分析了各自的适用条件和优缺点。此外，对有限数据量条件下低相干
区域大气相位校正、相干目标识别等问题进行了重点讨论。立足于工程应用需要，分别对D-InSAR测量地表形变的参数选择、测量
结果的精度验证、D-InSAR测量值与形变的关系、大区域处理以及形变场时空演变等问题进行了分析和讨论。 相似文献
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利用SAR影像配准偏移量提取地表形变的方法与误差分析 总被引：1，自引：1，他引：0
单一的InSAR观测技术可提取地表沿雷达视线方向(LOS)上的一维位移,而利用SAR影像配准过程中的同名像素偏移量可提取地表沿雷达方位向(近南北向)与距离向(近东西向)的二维形变场,与LOS方向的一维形变形成优势互补。本文在分析SAR影像配准偏移量提取地表形变场方法的基础上,推导建立了雷达方位向与距离向形变提取的误差模型,探讨了该方法提取地表形变的主要误差源。以Bam地震ASAR影像和玉树地震PALSAR影像为数据源,分别开展同震形变场的提取与误差分析试验,结果表明,基于SAR像素配准偏移量提取同震形变场的精度主要受匹配窗口尺寸与过采样因子影响,形变提取误差随匹配计算窗口的增大而减小,形变提取精度随过采样因子的增大有适量提高,地形起伏效应在高差较大的SAR影像区域中表现较为显著。 相似文献
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本文总结了星载合成孔径雷达在胶东地区地质应用中取得的一些具有重要意义的研究成果及图像处理分析结果。利用ＥＲＳ－１ＳＡＲ和ＪＥＲＳ－１ＳＡＲ图像在胶东地区发现了东西向韧性剪切带，其中以东尹－西林剪切带最为典型，该方向的构造运动对于胶东金矿区的金元素富集起到了重要作用；在图像分析、结合野外调查和实验室观察的基础上，提出了唐家泊影像异常为陨击遗迹的假说。为满足地质应用研究的需要，还研制了噪声抑制、多统计量纹理分析及图像处理分析方法。本研究表明，星载合成孔径雷达在胶东地区的地质应用中发挥了积极作用，是个十分有效的地质探测工具。 相似文献
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基于SAR干涉点目标分析技术的城市地表形变监测 总被引：1，自引：0，他引：1
通过深入研究干涉点目标的相位模型,提出基于空间搜索的邻近点目标干涉相位差解缠方法,用以计算点目标的地形残差和线性形变,以及分离点目标大气延迟相位和非线性形变相位的时空域滤波方法,解决干涉点目标分析中的关键问题.最后,以苏州地区地表沉降监测为应用试验,利用形成的SAR干涉点目标形变信息提取技术,获取苏州市区1992-2002年间的地表沉降信息.研究结果与已有文献记录保持比较好的一致性,证明SAR干涉点目标技术完全可以发展成为应用于城市地表形变监测的实用化技术.Abstract： Interferometric point target analysis (IPTA) is one of the latest developments in radar interferometric processing. It is achieved by analysis of the interferometric phases of some individual point targets, which are discrete and present temporarily stable backscattering characteristics, in long temporal series of interferometric SAR images. This paper analyzes the interferometric phase model of point targets, and then addresses two key issues within IPTA process. Firstly, a spatial searching method is proposed to unwrap the interferometric phase difference between two neighboring point targets. The height residual error and linear deformation rate of each point target can then be calculated, when a global reference point with known height correction and deformation history is chosen. Secondly, a spatial-temporal filtering scheme is proposed to further separate the atmosphere phase and nonlinear deformation phase from the residual interferometric phase. Finally, an experiment of the developed IPTA methodology is conducted over Suzhou urban area. Totally 38 ERS-1/2 SAR scenes are analyzed, and the deformation information over 3 546 point targets in the time span of 1992-2002 are generated. The IPTA-derivecl deformation shows very good agreement with the published result, which demonstrates that the IPTA technique can be developed into an operational tool to map the ground subsidence over urban area. 相似文献
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This paper reviews the advanced differential interferometry synthetic aperture radar (A-DInSAR) techniques, with two major components in focus. First is the basic concepts, synthetic aperture radar (SAR) data sources and the different algorithms documented in the literature, primarily focusing on persistent scatterers. In the second part, the techniques are compared in order to establish more linkage in terms of the variability of their applications, strength and validation of the interpreted results. Also, current issues in sensor and algorithm development are discussed. The study identified six existing A-DInSAR algorithms used for monitoring various deformation types. Generally, reports of their performance indicate that all the techniques are capable of measuring deformation phenomena at varying spatial resolution with high level of accuracy. However, their usability in suburban and vegetated areas yields poor results, compared to urbanized areas, due to inadequate permanent features that could provide sufficient coherent point targets. Meanwhile, there is continuous development in sensors and algorithms to expand the applicability domain of the technology for a wide range of deformable surfaces and displacement patterns with higher precision. On the sensor side, most of the latest SAR sensors employ longer wavelength (X and P bands) to increase the penetrating power of the signal and two other sensors (ALOS-2 PALSA-2 and SENTINEL-1) are scheduled to be launched in 2013. Researchers are investigating the possibility of using single-pass sensors with different look angles for SAR data collection. With these, it is expected that more data will be available for various applications. Algorithms such as corner reflector interferometry SAR, along track interferometry, liqui-InSAR, and squeeSAR are emerging to increase reliable estimation of deformation from different surfaces. 相似文献
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星载SAR复数图像的配准 总被引：16，自引：4，他引：16
星载干涉雷达测量已经被证实用于生成大范围（乃至全球）的DEM或监测地表位移具有广阔的应用前景，其中SAR复数图像序列的精确配准是保证生成有效干涉相位图的重要环节之一。本文分析了卫星InSAR系统中所涉及的几种坐标系统变换问题，并提出了基于此的几何配准方案，即基于卫星轨道状态矢量、SAR成像几何进行配准的算法；同时，还设计了基于几何配准结果和能量影像相关技术的配准算法，最后使用ERS－1／2、JERS－1和RADARSAT卫星获取的3种SAR复数图像对分别做几何配准和相关配准试验和比较，并对卫星SAR图像质量和轨道数据质量作了定性分析。 相似文献
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基于欧空局开发的跨平台SAR处理系统NEST,阐述了二轨法差分干涉的基本原理,介绍了Nest软件的特点和处理方法,并对Bam地震区域的形变量进行提取。 相似文献
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随着全球气候变化和人类活动剧增,青藏高原的多年冻土环境逐渐变得越来越脆弱。作为青藏高原最重要的基础设施之一,青藏输电线路已于2011年建成并投入使用。由于恶劣的气候和冻土的冻融作用,青藏输电线路部分区域的稳定性遭到破坏,为了保障输电线路的安全运营,需要对输电杆塔稳定性进行监测。传统监测方法（GPS和水准测量）对输电杆塔形变监测存在局限性。本文使用TerraSAR-X ST模式高分辨率SAR数据,采用考虑温度热膨胀形变模型的时序InSAR方法对青藏高原北麓河地区的输电线路杆塔进行形变监测,获得了输电杆塔和通信铁塔的形变速度、高度和热膨胀。结果证实了高分辨率时序InSAR技术在输变电工程形变监测应用中具有广阔的应用前景。 相似文献
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基于PSInSAR方法和ASAR数据监测天津地面沉降的试验研究 总被引：5，自引：0，他引：5
概述了PSInSAR方法的技术流程，阐述了定标ENVISAT ASAR数据对PS候选点（Persistent Scatterer Cadidate，PSC）筛选
的作用。研究表明：对ENVISAR ASAR 数据进行定标有助于筛选出更多的PS候选点；以定标得到的后向散射系数作为阈值，可以剔
除散射信号统计特性较稳定但散射强度低的像素点，从而避免可能由这些点引入的相位误差。在初步实现PSInSAR方法的基础上，
运用14景ENVISAT ASAR数据获得了天津地区的年均线性沉降速率，揭示的天津市地面沉降趋势与前人研究结果较为一致，获得的形
变速率值的准确性尚待数据量的增多而进一步提高。 相似文献
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遥感影像融合作为影像处理领域中最具有挑战的工作,一直是学术界研究的热点。合成孔径雷达SAR（Synthetic Aperture Radar）具备全天时、全天候、穿透云雾等多种特点,却因存在相干斑噪声等问题,使得影像难以解译。相比之下,光学影像可以反映地物的光谱和空间信息,易于解译,但容易受到云雾干扰,造成信息丢失,将光学与SAR影像数据融合可以实现不同类型传感器成像之间的信息互补,能够更好地为后续的影像分析与解译提供方便。本文首先对光学和SAR影像融合进行了系统性回顾,包括传统融合方法和基于深度学习方法在影像融合方面的最新工作,重点阐述了卷积神经网络CNN（Convolutional Neural Network）、生成式对抗网络GAN（Generative Adversarial Networks）等框架在光学和SAR影像融合中的进展;然后总结了光学和SAR影像融合在深度学习领域开发的数据集,并做了简单介绍和说明;最后,从数据集、时间序列影像融合、融合评价体系和算法轻量化等4个方面对光学和SAR影像融合的未来发展趋势进行了展望。 相似文献
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Generation of three-dimensional deformation maps from InSAR data using spectral diversity techniques
E. Erten A. Reigber O. Hellwich 《ISPRS Journal of Photogrammetry and Remote Sensing》2010,65(4):388-394
The capability of DInSAR (Differential Interferometric SAR) for precise large-scale deformation analysis has been shown in various case studies. Generally, DInSAR possesses a high potential for monitoring deformation, but only the velocity component parallel to the line-of-sight direction can be measured. An alternative approach, capable to retrieve the deformation velocity in both range and azimuth direction, is the so-called spectral diversity technique. Spectral diversity is based on a phase comparison between different sub-aperture interferograms of the scene and can generally be regarded as a high-performance technique for estimating the mis-registration between complex SAR images.In this paper, the following questions will be discussed: how to implement the spectral diversity technique for achieving the most accurate results; how to extract the full 3D deformation vector from a combination of ascending/descending passes and how to extract a surface deformation map if the data sets are not perfectly coherent. Finally, a statistical analysis of every individual processing step and an error propagation analysis is undertaken. In order to make a quantitative analysis of the technique, ENVISAT data sets of the Bam earthquake in Iran are used. 相似文献
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Persistent scatterer synthetic aperture radar interferometry (PSI) is a powerful remote sensing technique to detect and measure deformation of the Earth‘s crust – such as subsidence and landslides – with an accuracy of a few millimeters. Deformation is measured at specific points in a radar image called persistent scatterers (PS), which are characterized by long-term constant backscattering properties (high coherence) of the radar signal. Reliable PSI processing requires a stack of 15–50 SAR images and more, and processing is time-consuming (computational costs) and expensive (referring to both, costs for the SAR data and labor costs). Previous research for PS assessment used already acquired SAR data. This paper presents two new methods for predicting PS prior to the radar recording of the area of interest using freely available or low-cost land cover data, topographical maps and OpenStreetMap data. In the procedure, the distance between the assessed PS is calculated and classified regarding to the applicability for PSI processing. Additionally, the dispersion of the assessed PS within the site is analyzed. The results of the two assessment methods are validated using data of real PSI processing. Here, we show that the developed PS assessment techniques are fast and reliable tools to test the spatial applicability of PSI. 相似文献
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闫从政 《测绘与空间地理信息》2014,(7):98-100
基于笔者多年从事变形监测数据处理的相关工作经验,以面向测量机器人的变形监测数据处理为研究对象,介绍了工作基点变形和基准点测量误差的数据处理模型(该模型在传统模型基础上进行了改进),最后,本文结合实际工程数据进行了计算和分析,相信对从事相关工作的同行能有所裨益。 相似文献