搜索结果: 91-105 共查到“知识库 雷达工程”相关记录1912条 . 查询时间(4.844 秒)
利用中国廊坊站（39.4°N，116.7°E）流星雷达在2012年4月1日至2013年3月31日的水平风场观测数据，分析廊坊上空80~100km的中间层与低热层（Mesosphere and Lower Thermosphere，MLT）大气平均纬向风和经向风的季节变化特征.结果表明平均纬向风和经向风都表现出明显的季节变化特征.平均纬向风在冬季MLT盛行西风，极大值位于中间层顶，随高度增加西风减弱...
2012年7月海口与北京大气钠层观测
激光雷达 中高层大气 钠层密度 大气光学
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2018/5/4
2012年7月海南激光雷达站（20°N，110°E）和北京激光雷达站（40°N，116°E）同时进行观测，对比低纬和中纬度中高层大气钠层分布及密度变化特性.两地使用相同的Nd：YAG激光器和泵浦染料激光器产生589nm激光，设定相同的激光参数，使用相同的直径1000mm的望远镜接收钠层的光子回波.两地均观测到突发钠层和双钠层事件.其中：海口观测到突发钠层事件9个，双钠层事件1个；北京观测到突发钠层...
主动防护系统探测雷达的高速多目标配对
主动防护系统 多目标配对 高速目标
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2016/9/7
提出了一种基于目标补偿的主动防护系统探测雷达高速多目标配对方法。通过采用点频连续波与负斜率线性调频连续波的组合作为雷达发射信号，由点频差拍信号获得高速目标的多普勒频率， 构造补偿信号，对负斜率线性调频信号的差拍信号进行补偿，对于同一速度的高速目标补偿后得到目标距离。仿真结果验证了该方法的有效性。
结构矢量法的模糊故障树重要度分析
模糊故障树 梯形模糊数 重要度分析 结构矢量
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2018/3/6
针对模糊故障树分析中，重要度分析描述复杂、抽象含义不明确以及不利于重要度排序等问题，提出基于结构矢量的重要度分析方法。首先将梯形模糊数抽象为匀质梯形，将梯形模糊数的变化抽象为梯形质心的矢量变化。而后利用质心变化矢量在水平和垂直方向上的分量定义模糊故障树中故障率的变化量、梯形模糊数模糊度的变化量以及故障率的变化率。最后以某型雷达水冷系统故障为顶事件，通过重要度分析验证了所提方法的有效性。
OPERATIONAL MAPPING OF THE ENVIRONMENTAL CONDITION OF RIPARIAN ZONES OVER LARGE REGIONS FROM AIRBORNE LIDAR DATA
Riparian Zones LiDAR Large Spatial Extents Riparian Condition
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2016/2/29
Riparian zones maintain water quality, support multiple geomorphic processes, contain significant biodiversity and also maintain the
aesthetics of the landscape. Australian state and national govern...
AUTOMATIC RECONSTRUCED ROOF SHAPES FOR LIDAR STRIP ADJUSTMENT AND QUALITY CONTROL
LIDAR Reconstruction Adjustment Building Point Cloud Quality
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2016/2/29
In the recent years, the performance of LiDAR systems was improved by acquisition of the terrain surface with steadily increasing
point densities. However, the main error sources affecting the quali...
TREE CROWN DELINEATION FROM HIGH RESOLUTION AIRBORNE LIDAR BASED ON DENSITIES OF HIGH POINTS
Tree detection tree crown delineation density of high points (DHP) canopy height model (CHM)
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2016/2/29
Tree detection and tree crown delineation from Airborne LiDAR has been focusing mostly on utilizing the canopy height model
(CHM). This paper presents a method for individual tree crown delineation ...
ESTIMATING VERTICAL LEAF AREA DENSITY PROFILES OF TREE CANOPIES USING THREE-DIMENSIONAL PORTABLE LIDAR IMAGING
Broad leaf Canopy Leaf area density Lidar Point cloud 3D Voxel
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2016/2/29
In this paper, a new method for estimation of vertical leaf area density (LAD) profile of tree canopy using portable scanning lidar is
proposed. In this method, which we refer to as the voxel-based ...
A DECIDIOUS-CONIFEROUS SINGLE TREE CLASSIFICATION AND INTERNAL STRUCTURE DERIVATION USING AIRBORNE LIDAR DATA
LiDAR species classification geometrical analysis bole derivation branch derivation
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2016/2/29
This project has two main purposes; the first is to perform deciduous-coniferous classification for 65 trees by using the leaf-on single
flight LiDAR data. It was done by looking at the geometrical ...
OBJECT DETECTION IN AIRBORNE LIDAR DATA FOR IMPROVED SOLAR RADIATION MODELING IN URBAN AREAS
Airborne LiDAR 3D Point Cloud Solar Potential 3D Horizon Segmentation Vegetation
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2016/2/29
In times of higher market prices of fossil fuels and to meet the increasingly environmental and economic threads of climate change
renewable energy must play a major role for global energy supply. Th...
NEW INTEGRATION APPROACH OF PHOTOGRAMMETRIC AND LIDAR TECHNIQUES FOR ARCHITECTURAL SURVEYS
Integration Image Edge Matching LIDAR Automation Architecture
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2016/2/29
In the last few years, LIDAR and image-matching techniques have been employed in many application fields because of their
quickness in point cloud generation. Nevertheless, these techniques do not a...
VERIFICATION OF A BUILDING DAMAGE ANALYSIS AND EXTENSION TO SURROUNDINGS OF REFERENCE BUILDINGS
Change Detection LIDAR Vegetation Classification Building Disaster Raster Multispectral
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2016/2/29
After a disaster not necessarily all buildings in affected areas are damaged. Therefore, a building damage analysis does not only have
to distinguish different damage types. In fact, unchanged build...
LIDAR FILTERING ALGORITHMS FOR URBAN FLOOD APPLICATION: REVIEW ON CURRENT ALGORITHMS AND FILTERS TEST
LiDAR Filtering Algorithm Digital terrain model (DTM) Urban flood modelling Classification Urban Flood
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2016/2/29
Digital terrain model (DTM) is one of the important input parameters in urban flood application. This is because it influences the
flow direction, flow velocity, flood extend and flood depth. LiDAR ...
AUTOMATIC ROAD EXTRACTION FROM LIDAR DATA BASED ON CLASSIFIER FUSION IN URBAN AREA
LIDAR Road Extraction Classifier Fusion Classifier selection Genetic Algorithm
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2016/2/29
LIDAR is a powerful remote sensing technology for acquisition of 3D information from terrain surface. Algorithms used for LIDAR
data in urban area are used mostly to deal with the 3D points cloud an...