Synthetic Aperture Radar(SAR)interferometry is one of the most powerful remote sensing tools for ground deformation detection.However,tropospheric delay greatly limits the measurement accuracy of the InSAR technique.W...Synthetic Aperture Radar(SAR)interferometry is one of the most powerful remote sensing tools for ground deformation detection.However,tropospheric delay greatly limits the measurement accuracy of the InSAR technique.While vertically stratified tropospheric delays have been extensively investigated and well tackled,turbulent tropospheric phase noise still remains an intractable issue.In recent years,great efforts have been made to reduce the influence of turbulent atmospheric delay.This contribution is intended to provide a systematic review of the progress achieved in this field.First,it introduces the physical characteristics of atmospheric signals in interferograms.Then,a review of the main mitigation algorithms proposed in the literature is provided.In addition,the strengths and weaknesses of each approach are analyzed to provide guidance for choosing a suitable method accordingly.Finally,sug-gestions for resolving the challenging issues and an outlook for future research are given.展开更多
In the past 30 years,the small baseline subset(SBAS)InSAR time-series technique has emerged as an essential tool for measuring slow surface displacement and estimating geophysical parameters.Because of its ability to ...In the past 30 years,the small baseline subset(SBAS)InSAR time-series technique has emerged as an essential tool for measuring slow surface displacement and estimating geophysical parameters.Because of its ability to monitor large-scale deformation with millimeter accuracy,the SBAS method has been widely used in various geodetic fields,such as ground subsidence,landslides,and seismic activity.The obtained long-term time-series cumulative deformation is vital for studying the deformation mecha-nism.This article reviews the algorithms,applications,and challenges of the SBAS method.First,we recall the fundamental principle and analyze the shortcomings of the traditional SBAS algorithm,which provides a basic framework for the following improved time series methods.Second,we classify the current improved SBAS techniques from different perspectives:solving the ill-posed equation,increasing the density of high-coherence points,improving the accuracy of monitoring deformation and measuring the multi-dimensional deformation.Third,we summarize the application of the SBAS method in monitoring ground subsidence,permafrost degradation,glacier movement,volcanic activity,landslides,and seismic activity.Finally,we discuss the difficulties faced by the SBAS method and explore its future development direction.展开更多
碳捕集、利用和封存(Carbon Capture,Utilization and Storage)已经成为减少大气中二氧化碳的一种有效方法,但大量的二氧化碳注入地下可能会引起地表发生变形.为了探究二氧化碳注入后注采区的地表变化情况,本文基于45景Sentinel-1A升轨...碳捕集、利用和封存(Carbon Capture,Utilization and Storage)已经成为减少大气中二氧化碳的一种有效方法,但大量的二氧化碳注入地下可能会引起地表发生变形.为了探究二氧化碳注入后注采区的地表变化情况,本文基于45景Sentinel-1A升轨影像,运用SBAS-InSAR技术对国内某CO_(2)陆地埋存实验区域进行为期两年半形变监测工作,并构建了一种适用于小区域顾及GNSS的大气延迟改正模型.根据结果显示,本文提出的大气改正模型可以有效削减干涉图中的对流层延迟误差.根据InSAR结果显示,在注气过程中地表沿卫星视线方向靠近卫星,即地表发生隆起现象.通过提取注气井附近的形变时间序列,转换到垂直方向与GNSS数据对比,发现在注气之后,地表先隆起,几个月后开始逐渐回落.综合分析来看,结合GNSS与InSAR技术可以观测到该地区地表微小形变信息,GNSS监测站不仅可以用于校正InSAR干涉图中的大气延迟误差,还可以用于验证InSAR监测结果.展开更多
基金This work was partly supported by the National Science Fund for Distinguished Young Scholars,grant number 41925016the National Natural Science Foundation of China,grant number 41804008.
文摘Synthetic Aperture Radar(SAR)interferometry is one of the most powerful remote sensing tools for ground deformation detection.However,tropospheric delay greatly limits the measurement accuracy of the InSAR technique.While vertically stratified tropospheric delays have been extensively investigated and well tackled,turbulent tropospheric phase noise still remains an intractable issue.In recent years,great efforts have been made to reduce the influence of turbulent atmospheric delay.This contribution is intended to provide a systematic review of the progress achieved in this field.First,it introduces the physical characteristics of atmospheric signals in interferograms.Then,a review of the main mitigation algorithms proposed in the literature is provided.In addition,the strengths and weaknesses of each approach are analyzed to provide guidance for choosing a suitable method accordingly.Finally,sug-gestions for resolving the challenging issues and an outlook for future research are given.
基金This work was funded by the National Key R&D Program of China(2019YFC1509205)the National Natural Science Foundation of China(Nos.42174023 and 41804015)+1 种基金the Postgraduate Scientific Research Innovation Project of Hunan Province(150110074)the Postgraduate Scientific Research Innovation Project of Central South University(212191010).
文摘In the past 30 years,the small baseline subset(SBAS)InSAR time-series technique has emerged as an essential tool for measuring slow surface displacement and estimating geophysical parameters.Because of its ability to monitor large-scale deformation with millimeter accuracy,the SBAS method has been widely used in various geodetic fields,such as ground subsidence,landslides,and seismic activity.The obtained long-term time-series cumulative deformation is vital for studying the deformation mecha-nism.This article reviews the algorithms,applications,and challenges of the SBAS method.First,we recall the fundamental principle and analyze the shortcomings of the traditional SBAS algorithm,which provides a basic framework for the following improved time series methods.Second,we classify the current improved SBAS techniques from different perspectives:solving the ill-posed equation,increasing the density of high-coherence points,improving the accuracy of monitoring deformation and measuring the multi-dimensional deformation.Third,we summarize the application of the SBAS method in monitoring ground subsidence,permafrost degradation,glacier movement,volcanic activity,landslides,and seismic activity.Finally,we discuss the difficulties faced by the SBAS method and explore its future development direction.
文摘碳捕集、利用和封存(Carbon Capture,Utilization and Storage)已经成为减少大气中二氧化碳的一种有效方法,但大量的二氧化碳注入地下可能会引起地表发生变形.为了探究二氧化碳注入后注采区的地表变化情况,本文基于45景Sentinel-1A升轨影像,运用SBAS-InSAR技术对国内某CO_(2)陆地埋存实验区域进行为期两年半形变监测工作,并构建了一种适用于小区域顾及GNSS的大气延迟改正模型.根据结果显示,本文提出的大气改正模型可以有效削减干涉图中的对流层延迟误差.根据InSAR结果显示,在注气过程中地表沿卫星视线方向靠近卫星,即地表发生隆起现象.通过提取注气井附近的形变时间序列,转换到垂直方向与GNSS数据对比,发现在注气之后,地表先隆起,几个月后开始逐渐回落.综合分析来看,结合GNSS与InSAR技术可以观测到该地区地表微小形变信息,GNSS监测站不仅可以用于校正InSAR干涉图中的大气延迟误差,还可以用于验证InSAR监测结果.
