Measuring deformations using SAR interferometry and GPS observables with geodetic accuracy: Application to Tokyo,Japan     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

This paper presents new methodology for correcting interferometric synthetic aperture radar (InSAR) deformation maps using GPS observables and products. The methodology presents a sequential procedure for correcting the errors presented in InSAR deformation maps such as troposphere delay, ionosphere delay and baseline error. The main target of this research is to measure land deformations with geodetic accuracy using only one L-band interferogram with the aid of GPS observables and products. The proposed methodology was tested on Tokyo bay area which has been affected by the 2011 Tohoku earthquake. The results were verified against deformations detected by GPS stations and geodetic triangulation network showing a standard deviation of 5.6 and 10.5 mm, respectively.  相似文献   

Maximum-likelihood estimation for multi-aspect multi-baseline SAR interferometry of urban areas     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

The reconstruction of digital surface models (DSMs) of urban areas from interferometric synthetic aperture radar (SAR) data is a challenging task. In particular the SAR inherent layover and shadowing effects need to be coped with by sophisticated processing strategies. In this paper, a maximum-likelihood estimation procedure for the reconstruction of DSMs from multi-aspect multi-baseline InSAR imagery is proposed. In this framework, redundant as well as contradicting observations are exploited in a statistically optimal way. The presented method, which is especially suited for single-pass SAR interferometers, is examined using test data consisting of experimental airborne millimeterwave SAR imagery. The achievable accuracy is evaluated by comparison to LiDAR-derived reference data. It is shown that the proposed estimation procedure performs better than a comparable non-statistical reconstruction method.  相似文献   

A hybrid method for optimization of the adaptive Goldstein filter     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

The Goldstein filter is a well-known filter for interferometric filtering in the frequency domain. The main parameter of this filter, alpha, is set as a power of the filtering function. Depending on it, considered areas are strongly or weakly filtered. Several variants have been developed to adaptively determine alpha using different indicators such as the coherence, and phase standard deviation. The common objective of these methods is to prevent areas with low noise from being over filtered while simultaneously allowing stronger filtering over areas with high noise. However, the estimators of these indicators are biased in the real world and the optimal model to accurately determine the functional relationship between the indicators and alpha is also not clear. As a result, the filter always under- or over-filters and is rarely correct. The study presented in this paper aims to achieve accurate alpha estimation by correcting the biased estimator using homogeneous pixel selection and bootstrapping algorithms, and by developing an optimal nonlinear model to determine alpha. In addition, an iteration is also merged into the filtering procedure to suppress the high noise over incoherent areas. The experimental results from synthetic and real data show that the new filter works well under a variety of conditions and offers better and more reliable performance when compared to existing approaches.  相似文献   

基于改进PSInSAR技术的非城区地表形变监测     

张红峰  刘瀛 《大地测量与地球动力学》2021,41(6):568-571

为解决经典PSInSAR技术在非城区因受永久散射体空间分布不足而导致地形形变监测误差较大的问题,提出基于分时散射体(partial time scatterer,PTS)提取的改进算法。首先基于改进的经验模态分解对影像进行边缘保持平滑滤波降噪,然后采用可信概率估计对PTS目标进行联合提取,最后通过参数差分估计分离PTS相位和计算形变速率,从而得到监测区的地表形变。实验结果表明,提取的PTS目标基本可保持传统PS点的空间分布特性和时序变化趋势,提高非城区目标点的空间分布密度,本文算法具有有效性。  相似文献   

机载双天线InSAR联合定标算法     

王萌萌  黄国满  花奋奋  魏钜杰  卢丽君 《测绘学报》2014,43(12):1259-1265

为了提高InSAR获取DEM的精度,实际生产作业过程中每一架次均须飞临定标场,这就要求测绘人员需要多次布设角反射器.本文针对外业重复布设角反射器耗费时间和人力的问题,提出一种新的机载双天线InSAR联合干涉参数定标算法,实现了利用一次布设的控制点同时标定多架次干涉参数,减少了野外布设角反射器的工作量.该方法首先基于敏感度方程的定标方法选择适于机载双天线InSAR数据的干涉定标参数,其次将基于局部配准的配准方法和PSInSAR中PS点选取的方法首次引入高程连接点的选取中,实现了多架次同一场景的高程衔接.最后,根据控制点和连接点高程属性的差异,建立了不同的误差方程,组成联合定标模型,并利用中国测绘科学研究院的CASMSAR-X数据进行了联合定标试验,验证了该算法的正确性和有效性.  相似文献   

InSARʱ�򷨷�������ӳ���λ����μ�MODISˮ������Է���   总被引：1，自引：0，他引：1  

杨成生  张勤  张菊清 《大地测量与地球动力学》2015,35(1):92-96

????????????????????ε?????????????????????????40??Envisat ASAR?????д???????????飬????????????????λ????κ?MODIS???????????????з?????  相似文献   

2017年九寨沟MS7.0地震同震地表三维形变场解算研究          下载免费PDF全文

祝杰  韩宇飞  王坦  李瑜  王阅兵  师宏波  刘洋洋  樊俊屹  邵银星 《中国地震》2022,38(2):348-359

利用覆盖九寨沟M_S7.0地震的Sentinel-1升、降轨和Radarsat-2升轨数据,分别提取了3个轨道沿雷达视线向形变,运用多平台联合观测方法解算了九寨沟地震沿地表真实的垂直向、SN向和EW向形变信息。结果表明,3个轨道InSAR数据均监测到了LOS向同震形变,范围约55km×45km,呈“果仁状”,靠近卫星飞行方向最大形变量为12.9cm (降轨),远离卫星飞行方向最大形变量为19.5cm (升轨)。三维形变结果显示,垂直向上位移达23.4cm,垂直向下位移达17.6cm;北向位移达141.8cm,南向位移达100.2cm;东向位移达22.0cm,西向位移达10.7cm。树正断裂两端地块呈非对称水平相对运动,上盘单侧向东形变较剧烈,符合左旋走滑型地震事件的运动特征。  相似文献