搜索结果: 31-45 共查到“知识库 雷达工程”相关记录1910条 . 查询时间(4.911 秒)
提出了一种基于平行因子分析的时空非均匀采样下双基地MIMO雷达收发角及多普勒频率联合估计算法。首先计算K级非均匀延迟器输出数据的协方差矩阵并对该矩阵进行变换和去冗余处理，然后将新数据转化为三阶张量并对其进行降维处理，最后通过交替最小二乘和Root MUSIC算法估计出目标收发角和多普勒频率。该算法实现了时域和空域孔径自由度的二次扩展，提高了参数估计精度，降低了运算量。此外，通过最小冗余配置，实...
为解决雷达对低空目标角度估计精度不高的问题，提出一种基于时间反转（TR）多输入多输出（MIMO）雷达的低空目标波达方向估计算法。该算法先利用TR技术的聚焦性能，获得回波信号矩阵；然后根据MIMO雷达波形的分集特性，推导出TR MIMO雷达的虚拟阵列形式；再通过行列复用，采用双向空间平滑(FBSS)算法解相干，有效地提高了低空目标的DOA估计精度。实验仿真结果表明：在信噪比为-10 dB的条件下，该...
基于超材料的雷达吸波材料研究进展
超材料 雷达吸波材料 宽带
2018/12/16
雷达吸波材料能够有效地抑制透射波和反射波，因而被广泛应用于隐身、电磁屏蔽和兼容以及无线通信等领域。受制于材料的电磁频散特性，传统吸波材料的宽带低频吸波性能难以进一步提高。近年来，随着超材料结构设计的不断发展，基于超材料构架设计实现的宽带电磁吸波，由于具有更加灵活的电磁调控能力，因而在其电磁性能提升方面具有更大拓展空间。围绕雷达吸波超材料的最新研究进展，结合电磁吸波超材料的发展背景、设计原理和性能表...
ROAD NETWORK MAPPING USING AIRBORNE LiDAR DATA
Road Airborne Laser Scanning (ALS) Intensity
2018/11/19
The accurate, detailed and up-to-date road information is highly essential geo-spatial databases for transportation, smart city and other related applications. Thus, the main objective of this researc...
GEOPHYSICAL PARAMETER RETRIEVAL FOR MICROWAVE C BAND SYNTHETIC APERTURE RADAR (SAR) DATASET USING INTEGRAL EQUATION MODEL
Microwave SAR Geophysical Parameters IEM Modelling
2018/11/19
The microwave remote sensing is highly useful, as it provides synoptic observation of the Earth’s surface or planetary bodies, regardless of day or night and the atmospheric conditions, propagation th...
RADAR CROSS SECTION CHARACTERIZATION OF CORNER REFLECTORS IN DIFFERENT FREQUENCY BANDS AND POLARIZATIONS
Corner Reflector Radar Cross Section Trihedral Dihedral Compact Antenna Test Range Facility Calibration
2018/11/19
Corner Reflectors (CR) are standard passive radar targets which offer one of the best solutions for SAR calibration. Radar Cross Section (RCS) of corner reflectors plays a vital role for estimation of...
ASSESSING THE CONDITION OF BURIED PIPE USING GROUND PENETRATING RADAR (GPR)
Ground Penetrating Radar (GPR) Pipe deterioration Buried utilities
2018/10/26
The invention of Ground Penetrating Radar (GPR) technology has facilitated the possibility of detecting buried utilities and has been used primarily in civil engineering for detecting structural defec...
ON VOLUME DATA REDUCTION FOR LIDAR DATASETS
LiDAR Redundancy Q-tree Big Data Problem Topography DTM
2018/9/19
This paper discusses a current issue for several experimental science disciplines, which is the Big Data Problem (BDP). This research study focused on light intensity and ranging (LiDAR) datasets, whi...
COMBINED VISUAL EXPLORATION OF 2D GROUND RADAR AND 3D POINT CLOUD DATA FOR ROAD ENVIRONMENTS
Ground Penetrating Radar 3D Point Cloud Infrastructure Maintenance
2018/9/12
Ground-penetrating 2D radar scans are captured in road environments for examination of pavement condition and below-ground variations such as lowerings and developing pot-holes. 3D point clouds captur...
北京地区大气温度及重力波活动的季节变化
激光雷达 大气温度 重力波 势能密度
2018/5/4
利用瑞利激光雷达观测数据，分析了北京地区35~70km高度范围内大气温度和重力波活动的季节变化.发现北京地区30~70km高度范围内的大气温度有明显的年周期变化：平流层顶最高温度出现在6，7月份，大约为270K；中间层70km高度最低温度也出现在6，7月份，大约为200K.以2014年10月14日晚数据为例，分析重力波势能密度，发现50km以下重力波势能存在耗散，而在50km以上重力波近乎无耗散地...
ABOVEGROUND BIOMASS ESTIMATION USING RECONSTRUCTED FEATURE OF AIRBORNE DISCRETE-RETURN LIDAR BY AUTO-ENCODER NEURAL NETWORK
Aboveground Biomass (AGB) Estimation Discrete-Return LiDAR Regression Auto-Encoder Neural Network
2018/4/30
Aboveground biomass (AGB) estimation is critical for quantifying carbon stocks and essential for evaluating carbon cycle. In recent years, airborne LiDAR shows its great ability for highly-precision A...
INFRARED ROTATION PLANE RADAR CHANGE DETECTION
Infrared Rotation Plane Radar Change Detection Depth Information Mixed Gaussian Background Modeling
2018/4/30
The existing change detection method mainly stays on the pixel-level, which is very susceptible to light, shadow, etc. And the complex calculation and analysis for each pixel reduce the detection effi...
GF-3 SAR IMAGE DESPECKLING BASED ON THE IMPROVED NON-LOCAL MEANS USING NON-SUBSAMPLED SHEARLET TRANSFORM
GF-3 SAR non-subsampled Shearlet transform image despeckling improved Non-Local Means
2018/4/30
GF-3 synthetic aperture radar (SAR) images are rich in information and have obvious sparse features. However, the speckle appears in the GF-3 SAR images due to the coherent imaging system and it hinde...
FLOOD EXTENT MAPPING USING DUAL-POLARIMETRIC SENTINEL-1 SYNTHETIC APERTURE RADAR IMAGERY
Flood Polarimetry SAR Radar Harvey Sentinel-1
2018/4/30
Rapid generation of synthetic aperture radar (SAR) based flood extent maps provide valuable data in disaster response efforts thanks to the cloud penetrating ability of microwaves. We present a method...