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TIE POINTS EXTRACTION FOR SAR IMAGES BASED ON DIFFERENTIAL CONSTRAINTS
Synthetic Aperture Radar (SAR) Tie Points Matching Extraction Differential Constraints
2018/4/30
Automatically extracting tie points (TPs) on large-size synthetic aperture radar (SAR) images is still challenging because the efficiency and correct ratio of the image matching need to be improved. T...
THREE-DIMENSIONAL RECONSTRUCTION OF THE VIRTUAL PLANT BRANCHING STRUCTURE BASED ON TERRESTRIAL LIDAR TECHNOLOGIES AND L-SYSTEM
Terrestrial LiDAR L-system Branching structure Point cloud data Topology structure
2018/4/30
For the purpose of extracting productions of some specific branching plants effectively and realizing its 3D reconstruction, Terrestrial LiDAR data was used as extraction source of production, and a 3...
TYPICAL APPLICATIONS OF AIRBORNE LIDAR TECHNOLAGY IN GEOLOGICAL INVESTIGATION
airborne light detection and ranging (LiDAR) surface subsidence landslide fault
2018/4/30
The technology of airborne light detection and ranging (LiDAR), also referred to as Airborne Laser Scanning, is widely used for high-resolution topographic data acquisition (even under forest cover) w...
3D BUILDING CHANGE DETECTION BETWEEN CURRENT VHR IMAGES AND PAST LIDAR DATA
Change detection LiDAR data VHR images DSM Quality Disparity MRF Optimization
2018/3/30
Change detection is an essential step to locate the area where an old model should be updated. With high density and accuracy, LiDAR data is often used to create a 3D city model. However, updating LiD...
EXTRACTION OF BUILDING ROOF EDGES FROM LIDAR DATA TO OPTIMIZE THE DIGITAL SURFACE MODEL FOR TRUE ORTHOPHOTO GENERATION
LiDAR Aerial photos Edge Detection DSM True Orthophoto
2018/3/30
Various kinds of urban applications require true orthophotos. True orthophoto generation requires a DSM (Digital Surface Model) to project the photo orthogonally and minimize geometric distortion due ...
NUMERICAL SIMULATION AND EXPERIMENTAL VALIDATION OF WAVE PATTERN INDUCED COORDINATE ERRORS IN AIRBORNE LIDAR BATHYMETRY
Airborne LiDAR bathymetry multimedia photogrammetry refraction wave pattern accuracy analysis
2018/3/30
Airborne LiDAR bathymetry (ALB) requires a refraction correction on the basis of Snell’s law at the air-water interface and a speedof- light correction to be applied on the raw laser data in order to ...
雷达数据采集一直是以香农采样定理为基础的，因而在军事侦测、地球遥感等涉及大范围、高分辨率观测应用中面临挑战：或难以实现期望的高采样率，或带宽限制难以支持实时处理，或系统复杂难以机载或星载。所以，如何突破香农采样，以更少的采样实现高分辨率观测是稀疏微波成像的重大基础科学问题与技术问题。近年来发展的压缩感知理论展现了利用观测场景的稀疏性解决问题的新构想，但已知框架(L(1)正则化)对采样率要求依然过高...
MONITORING OF HORIZONTAL MOVEMENTS OF HIGH-RISE BUILDINGS AND TOWER TRANSMITTERS BY MEANS OF GROUND-BASED INTERFEROMETRIC RADAR
Ground-based radar interferometry Horizontal movements Deformations High-rise buildings Tower transmitters
2018/3/6
The paper describes possibilities of the relatively new technics – ground based radar interferometry for precise determining of deformation of structures. Special focus on the horizontal movements of ...
OBJECT-ORIENTED CLASSIFICATION OF LIDAR DATA FOR POST-EARTHQUAKE DAMAGE DETECTION
LiDAR Earthquake Classification Object Oriented Image Analysis Buildings Damage Detection
2018/3/6
The collapse of buildings during the earthquake is a major cause of human casualties. Furthermore, the threat of earthquakes will increase with growing urbanization and millions of people will be vuln...
探地雷达在土地整治道路工程验收中的应用研究
探地雷达 无损探测 混凝土 误差分析
2018/3/2
道路验收工作中，厚度、压实度等工程参数常常是验收工作中的重要指标，基于探地雷达的道路工程质量检测技术在土地整治项目区的道路验收中可以达到无损、快速和准确。研究采用pulse EKKO PRO 1000型探地雷达,使用剖面法对道路工程混凝土路面进行雷达探测，结合现场钻孔取心进行电磁波速度修正，经过校正、增益、背景去噪、反褶积等多项预处理，有效抑制噪声，提高分辨力，最后根据相应的电磁波传播速度值完成厚...
3.11THz标准体雷达散射截面测量
太赫兹(THz)波 雷达散射截面(RCS) 标准体 定标
2018/2/25
针对太赫兹近场散射特性测量特点，基于CO2激光抽运的太赫兹激光器和双层独立转动平台搭建了一套高频段太赫兹雷达散射截面（RCS）测量系统。利用不锈钢光滑金属球体作为标准定标体验证了系统的可靠性，测量结果与理论值误差小于3 dBsm，系统的信噪比优于24 dB。首次利用该系统开展了3.11 THz频点处不同材料及涂覆层圆形金属平板及不同底面直径圆锥体RCS的测量。通过比较分析发现了表面阳极氧化和喷漆处...
该文针对现有穿墙雷达建筑物布局成像中扩展目标稀疏成像方法未能有效利用墙体反射信号的结构稀疏性，导致成像中出现墙体不连贯和墙体轮廓不明显的问题，提出一种利用稀疏信号块间耦合的建筑物布局成像方法。该方法在块稀疏信号特性的高斯分层先验模型的基础上，利用块间耦合系数进一步表征场景中墙体反射信号的结构稀疏性，然后将其引入到控制稀疏信号先验概率分布的超参数中，从而把稀疏信号的结构性转化为超参数的耦合关系，最后...
电离层相位污染严重制约天波超视距雷达对低可探测慢速舰船目标的检测性能，时频校正法成为目标检测的重要手段，对其进行分类并选取6种典型方法进行了去污染的综合性能评估。首先分析了性能比较的影响因素，然后从去污染的有效性、鲁棒性和运算量等几个方面进行了校正方法的综合比较。为电离层相位污染校正算法库的丰富和实际工程应用提供参考。
双基前视SAR几何定位及同步误差分析
合成孔径雷达 双基前视 无参考点定位 定位精度
2018/1/23
针对目标区域不存在图像匹配基准点如对海面目标、草原目标等定位时，基于图像匹配的目标定位方法失效问题，该文提出基于R-D原理的双基前视SAR几何定位方法。首先，在相邻合成孔径中心时刻，利用收发平台与目标的几何关系进行数学建模；再结合地距SAR图像中的目标与场景中心点的关系，解算目标相对接收平台的位置信息；最终，根据双基地前视SAR系统的特点，建立空时频同步误差模型，并结合仿真计算结果给出其对定位精度...