搜索结果: 1-15 共查到“航空、航天科学技术 R-D model”相关记录20条 . 查询时间(0.203 秒)
ESTIMATION OF SATELLITE-BASED SO42− AND NH4+ COMPOSITION OF AMBIENT FINE PARTICULATE MATTER OVER CHINA USING CHEMICAL TRANSPORT MODEL
PM2.5 chemical components sulfate ammonium satellite-estimated chemical transport model
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2018/5/15
Epidemiologic and health impact studies have examined the chemical composition of ambient PM2.5 in China but have been constrained by the paucity of long-term ground measurements. Using the GEOS-Chem ...
AIRCRAFT SEGMENTATION IN SAR IMAGES BASED ON IMPROVED ACTIVE SHAPE MODEL
SAR target segmentation aircraft ISOMAP
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2018/5/16
In SAR image interpretation, aircrafts are the important targets arousing much attention. However, it is far from easy to segment an aircraft from the background completely and precisely in SAR images...
3D MODEL GENERATION USING OBLIQUE IMAGES ACQUIRED BY UAV
UAV oblique images flight plan SfM cultural heritage open source
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2017/8/10
In recent years, many studies revealed the advantages of using airborne oblique images for obtaining improved 3D city models (including façades and building footprints). Here the acquisition and ...
AUTONOMOUS NAVIGATION OF SMALL UAVS BASED ON VEHICLE DYNAMIC MODEL
utonomous Navigation UAV Vehicle Dynamic Model Integration GNSS outage
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2016/3/25
This paper presents a novel approach to autonomous navigation for small UAVs, in which the vehicle dynamic model (VDM) serves as the main process model within the navigation filter. The proposed metho...
A Systematic Study on the Impact of Dimensionality for a Two-Dimensional Aerodynamic Optimization Model Problem
Systematic Study Impact Dimensionality Two-Dimensional Aerodynamic Optimization Model Problem
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2015/7/3
A model problem, based on the NACA0012 airfoil, is studied. The thickness distribution of the symmetric NACA0012 airfoil is optimally approximated with a 4th-order Bezier curve. This best-fit ap...
Ionospheric Threat Model Methodology for WAAS
Ionospheric Threat Model Methodology WAAS
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2015/6/26
The ionosphere is the largest remaining error source affecting GPS. It also has some of the least predictable spatial and temporal variations. As such the ionosphere becomes the determining factor in ...
LAAS Ionosphere Spatial Gradient Threat Model and Impact of LGF and Airborne Monitoring
LAAS Ionosphere Spatial Gradient Threat Model Airborne Monitoring
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2015/6/26
The ionosphere spatial gradient and its temporal rate of change in the vicinity of a LAAS-equipped airport are likely to influence the architecture required to meet the Category II/III precision appro...
A Comprehensive Ionosphere Storm Data Analysis Method to Support LAAS Threat Model Development
Ionosphere Storm Support LAAS Threat Model
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2015/6/26
Several recent papers have analyzed the potential threat of severe ionosphere spatial gradients on LAAS users [1-4]. To support this work, a comprehensive methodology has been developed to analyze WAA...
Prior Probability Model Development to Support System Safety Verification in the Presence of Anomalies
Prior Probability Model Development Support System Safety Verification
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2015/6/26
Assessments of “prior probabilities” of faults that must be mitigated are essential to integrity and safety verification for safety-critical systems. In the case of Global Navigation Satellite System ...
Model Analysis on the Performance of an Inertial Aided FLL-Assisted-PLL Carrier-Tracking Loop in the Presence of Ionospheric Scintillations
Model Analysis Performance Inertial Aided FLL-Assisted-PLL Carrier-Tracking Loop Presence Ionospheric Scintillations
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2015/6/25
Ionospheric scintillation has a significant impact on the availability of Global Positioning System (GPS) and Wide Area Augmentation System (WAAS), especially when the GPS/WAAS receiver is dynamically...
Constructing Ionospheric Irregularity Threat Model for Korean SBAS
Constructing Ionospheric Irregularity Threat Model Korean SBAS
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2015/6/24
Single-frequency based Satellite-Based Augmentation Systems (SBAS), the augmentation of the Global Navigation Satellite System (GNSS), broadcast estimates of vertical ionospheric delays and confidence...
SATELLITE IMAGE SIMULATIONS FOR MODEL-SUPERVISED, DYNAMIC RETRIEVAL OF CROP TYPE AND LAND USE INTENSITY
M4Land land management classification system Sentinel
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2015/5/6
To support food security, information products about the actual cropping area per crop type, the current status of agricultural production and estimated yields, as well as the sustainability of the ...
A 3D Model Based Imdoor Navigation System for Hubei Provincial Museum
Three-dimensional Navigation Mobile Application Database
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2014/4/21
3D models are more powerful than 2D maps for indoor navigation in a complicate space like Hubei Provincial Museum because they can provide accurate descriptions of locations of indoor objects (e.g., d...
Combustor design and performance prediction based on parametric model
parametric model parametric design combustor design combustor performance performance prediction
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2014/5/15
By combining the three-dimensional model software and grid generation software, the combustor parametric model and high quality and high speed gridding in the full flow field has been realized. Based ...
Improved uncertainty propagation method of dynamic model for Mars entry spacecraft
Mars entry dynamic equations improved method high accuracy
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2014/6/9
In order to research the uncertainty propagation laws of Mars entry dynamic equations for the Mars entry phase, an improved method was presented for analyzing the effect of the initial state uncertain...