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近日,中国测绘科学研究院张永红研究团队利用自主研发的InSAR超算平台,成功获取了2021年9月至2022年4月全国地表形变一张图。
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2021年12月10日下午,由测绘与空间信息学院主办的第8期智“绘”讲堂在J6楼434学术报告厅成功举办。本期智“绘”讲堂邀请到了中南大学教授、校学术委员会委员、国际数字地球学会中国国家委员会委员、微波遥感专业委员会副主任委员、中国地震学会大地测量与地震动力学专业委员会副主任委员、中国测绘学会矿山测量专业委员会副主任委员李志伟教授作了题为“高精度InSAR三维形变测量”的主题报告。受疫情影响,本次...
低轨卫星编队的精密轨道和基线确定是分布式InSAR卫星系统完成科学任务的重要前提。目前,基于GNSS数据的缩减动力学绝对和相对轨道确定是获得高精度轨道和基线产品的主要手段。本文利用天绘二号编队星载GPS实测数据,采用缩减动力学定轨方法进行编队卫星绝对和相对定轨研究。GPS数据质量分析表明,A星与B星接收机的信号跟踪能力和数据质量基本相当。通过对轨道机动进行常值加速度建模,可以有效消除机动对天绘二号...
多时相InSAR技术具有探测大范围毫米级地表形变的能力,已被广泛应用于地面沉降监测。近几年,应用多时相InSAR技术监测以高铁为代表的大尺度人造线状地物形变备受关注。本文将C波段SAR数据用于高铁沿线路基形变监测,应用相位稳定性分析和改进的StaMPS技术来增加相干性点的密度和形变参数解算的稳定性。采用研究区时间跨度为21个月的47景Sentinel-1A数据,对连(云港)盐(城)高铁及其沿线区域...
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我国首套自主知识产权超算InSAR系统实现全国地表形变监测(图)
自主知识产权 超算 InSAR系统 地表形变监测
2020/12/16
近日,中国科学院空天信息创新研究院王超研究员团队与计算技术研究所尤海航研究员团队,成功研制了我国首套自主知识产权的超算合成孔径雷达干涉测量(InSAR)系统,首次实现了全国尺度地表形变InSAR制图。地球表面因受地球内外动力的驱动,一直不停地运动和变化,从秒级的地震破裂到数十年甚至更长时间的断层蠕变,造成的地质灾害威胁着人类生命和财产安全。我国作为受地质灾害影响最严重的国家之一,地质灾害造成的损失...
随着不同成像参数SAR卫星不断发射升空以及新 的I nSAR技术不断出现,同一地区可以获取多尺度、多 源、异 质 的I nSAR地 表 形 变 监 测 数 据.将 这 些 多 源 I nSAR地表形变监测数据作为观测量,实际三维地表形 变作为未知参数,建立模型并解算,实现东西、南北和垂 直向地表形变监测,为地质灾害预报及监测提供更全面 的基础资料.本文以I nSAR三维地表形变解算为核心研 究内容...
一种新的桥梁区域时序InSAR相位解缠方法
时间序列InSAR 桥梁形变检测 相位解缠 二分图匹配
2019/4/18
时间序列InSAR技术是一种空间遥感技术,可用于获取基础设施的高精度微小形变信息,相比传统测量手段,该技术有较多优点,在桥梁形变检测方面有广阔的应用前景。但现有的时间序列InSAR技术中的相位解缠算法在大型斜拉桥形变检测上存在较大解缠误差,导致目前该技术还难以获取正确的斜拉桥形变结果。提出一种新的时间序列InSAR相位解缠算法。通过构建约束三角网络,对残差点进行分块,利用二分图最优权匹配方法获取最...
EVALUATION OF AIRBORNE L- BAND MULTI-BASELINE POL-INSAR FOR DEM EXTRACTION BENEATH FOREST CANOPY
Digital Elevation Model, SAR, Multi-baseline Pol-InSAR, TomoSAR, Forest canopy, Scattering characteristics separation
2018/5/14
DEM beneath forest canopy is difficult to extract with optical stereo pairs, InSAR and Pol-InSAR techniques. Tomographic SAR (TomoSAR) based on different penetration and view angles could reflect vert...
GROUND SUBSIDENCE ALONG SHANGHAI METRO LINE 6 BY PS-InSAR METHOD
Ground subsidence Shanghai Metro Line 6 PS-InSAR COSMO-SkyMed Envisat ASAR
2018/5/15
With the rapid development of urban economy, convenient, safe, and efficient urban rail transit has become the preferred method for people to travel. In order to ensure the safety and sustainable deve...
THE TRANSMISSION CHANNEL TOWER IDENTIFICATION AND LANDSLIDE DISASTER MONITORING BASED ON INSAR
Transmission Channel Transmission Tower Identification InSAR Time Series D-InSAR Landslide Monitoring
2018/5/14
The transmission distance of transmission lines is long, the line affected by the diversity of climate and topography of the corridors of transmission lines, differences in regional geological structu...
ANALYSIS OF LAND SUBSIDENCE MONITORING IN MINING AREA WITH TIME-SERIES INSAR TECHNOLOGY
Time-series InSAR Land Subsidence ALOS PALSAR RADARSAT-2
2018/5/15
Time-series InSAR technology has become a popular land subsidence monitoring method in recent years, because of its advantages such as high accuracy, wide area, low expenditure, intensive monitoring p...
INSAR UNWRAPPING ERROR CORRECTION BASED ON QUASI-ACCURATE DETECTION OF GROSS ERRORS (QUAD)
QUAD, InSAR, Unwrapping Error Correction, Gross Error, L1-norm
2018/5/14
Unwrapping error is a common error in the InSAR processing, which will seriously degrade the accuracy of the monitoring results. Based on a gross error correction method, Quasi-accurate detection (QUA...
PRELIMINARY GAOFEN-3 INSAR DEM ACCURACY ANALYSIS
GF-3 satellite, error analysis, calibration, digital elevation model, precision validation
2018/5/11
GF-3 satellite, the first C band and full-polarization SAR satellite of China with spatial resolution of 1 m, was successfully launched in August 2016. We analyze the error sources of GF-3 satel...
GROUND SUBSIDENCE MONITORING WITH MT-InSAR AND MECHANISM INVERSION OVER XI’AN, CHINA
Xi’an MT-InSAR Land subsidence Subway line No.3 Inversion
2018/5/15
The ancient Xi’an, China, has been suffering severe land subsidence and ground fissure hazards since the 1960s, which has affected the safety of Subways. Multi-sensor SAR data are conducted to monitor...
ERROR ANALYSIS AND VALIDATION FOR INSAR HEIGHT MEASUREMENT INDUCED BY SLANT RANGE
InSAR DEM Slant Range Error Simulation Validation SRTM TanDEM-X
2018/5/16
InSAR technique is an important method for large area DEM extraction. Several factors have significant influence on the accuracy of height measurement. In this research, the effect of slant range meas...