检索结果-内蒙古大学图书馆

On-orbit attitude planning for Earth observation imaging with star-based geometric calibration

Science China(Technological Sciences) 2025年第2期68卷 243-256页

作者： Di HUANG Zhifu WANG Jianya GONG Haoran JI Institute of Aerospace Science and Technology School of Remote Sensing and Information EngineeringWuhan UniversityWuhan 430072China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingSchool of Remote Sensing and Information EngineeringWuhan UniversityWuhan 430072China National Key Laboratory of Air-based Information Perception and Fusion Luoyang 471009China Intelligent Game and Decision Laboratory Beijing 100071China

To improve the quality of remote sensing images,a novel on-orbit attitude planning method for Earth observation imaging with star-based geometric calibration is presented in this *** traditional imaging processes,the proposed method includes both pre-calibration and post-calibration stages to enhance the accuracy of satellite geometric positioning.A multiple-constraint attitude planning algorithm was developed to ensure star-based calibration,wherein the satellite camera and star sensors simultaneously capture the images of *** integration of cameras and multiple star sensors enables effective attitude *** the Earth imaging stage,a fast on-orbit attitude planning algorithm was developed to determine the satellite attitude and the optimal imaging times for ground *** with existing methods,the fast on-orbit attitude planning algorithm can significantly reduce computational time and resource consumption via initial value selection and *** demonstrate the effectiveness of the proposed attitude planning method,which was successfully applied to Wuhan 1 satellite.

关键词： attitude planning Earth observation imaging geometric calibration attitude constraints

来源：评论

学校读者我要写书评

暂无评论

Hybrid meta-optics facilitate an athermal continuous zoom optical system

引用

Optics Express 2025年第8期33卷 17121-17135页

作者： Tang, Yufeng Mao, Shan Song, Yichen Zhao, Jianlin Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technology Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and Technology Northwestern Polytechnical University Xi’an710129 China Shaanxi Key Laboratory of Optical Remote Sensing and Intelligent Information Processing Xi’an710119 China

To meet the demand for continuous zoom capabilities in compact lenses over a wide temperature range, we designed a compact continuous zoom optical system based on hybrid meta-optics. This system can achieve thermal stability without additional heating or cooling across a broad temperature range, utilizing commonly available optical glass. It features a total length of just 9∼12 mm and comprises only 4 lenses. By incorporating metalens, the system effectively corrects chromatic aberration and off-axis distortion, while leveraging the thermal stability of these lenses to achieve passive thermal management. Analytical results demonstrate that the system is structurally compact, capable of smooth continuous zooming from -20∼+60 ℃ with a focal length range of 4.9∼9.8 mm, and maintains excellent imaging quality throughout (with a modulation transfer function greater than 0.5 at 100 lp/mm). Additionally, the zoom and tolerances are highly feasible. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Aberrations

来源：评论

学校读者我要写书评

暂无评论

Metalens-based hybrid probe near-infrared endoscope objective

引用

Optics Express 2025年第3期33卷 5757-5768页

作者： Song, Yichen Mao, Shan Tang, Yufeng Zhao, Jianlin Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technology Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and Technology Northwestern Polytechnical University Xi’an710129 China Shaanxi Key Laboratory of Optical Remote Sensing and Intelligent Information Processing Xi’an710119 China

Rapid large-area deep tissue imaging at long working distances is important for clinical diagnosis. A near-infrared metalens-based hybrid probe con-focal micro-endoscope (pCM) objective with a large field of view of 500 µm, a long working distance of 300 µm, and a small caliber of 2.2 mm was designed, which is compatible with conventional endoscopes to produce cell-resolution images of deep tissues. The performance of the metalens-based hybrid objective optical system was analyzed. Results show that the metalens-based hybrid pCM significantly improves the imaging quality of such optical systems under the premise of meeting the design accuracy requirements, which provides a new solution and an effective realization for the design of such optical systems. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Infrared devices

来源：评论

学校读者我要写书评

暂无评论

A Fast and Robust Calibration Method for Lambert Model in VLP System Without Any Geometric Measurement

引用

IEEE Internet of Things Journal 2025年第10期12卷 14653-14662页

作者： Huang, Tianming Zhuang, Yuan Yang, Xiansheng Sun, Xiao Yu, Tengfei Cao, Xiaoxiang Wuhan University State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan430072 China Wuhan University State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan Institute of Quantum Technology Shenzhen Research Institute Wuhan430072 China Company Ltd. Suzhou215347 China

Visible light positioning (VLP) is one of the most promising technologies for providing high-precision, low-cost indoor positioning, and navigation services. However, the traditional calibration methods of VLP are complex and unfriendly to users, which hinders the large-scale commercial deployment of VLP systems. In this article, a fast and robust calibration method for received signal strength (RSS)-based VLP system is proposed, which dispenses with geometric measurement and greatly simplifies the calibration procedures. The proposed method calibrates the Lambert model through two steps, first using a ratio method to calibrate the Lambert order, and then estimating the constant term. The actual processes only require moving a robot equipped with a photodetector (PD) along a rectangular trajectory once, and then the program will automatically estimate the required parameters by analyzing the RSS during this period. Experimental results show a good stability of the calibrated parameters, as well as an excellent distance measuring accuracy within 12 cm. The proposed method is 3.7 times more efficient than traditional methods while the positioning accuracy is close, which will greatly reduce the time and labor costs of large-scale deployment. © 2014 IEEE.

关键词： Calibration

来源：评论

学校读者我要写书评

暂无评论

Simulations of GaoFen-5 Directional Polarimetric Camera(DPC) Observations Using the Advanced Vector Discrete Ordinate Radiative Transfer Model

引用

Advances in Atmospheric Sciences 2025年第3期42卷 486-500页

作者： Yuchen XIE Ziqiang ZHU Fuzhong WENG Zhengqiang LI Xiuzhen HAN School of Remote Sensing&Geomatics Engineering Nanjing University of Information Science&TechnologyNanjing 210044China Earth System Modeling and Prediction Centre China Meteorological AdministrationBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China Environmental Protection Key Laboratory of Satellite Remote Sensing&Key Laboratory of Remote Sensing and Digital Earth Aerospace Information Research InstituteChinese Academy of Sciences.Beijing 100101China National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081China

In recent years,polarization remote sensing has garnered increasing attention,particularly within the realm of *** accurately simulate polarization information,the vector discrete-ordinate radiative transfer(VDISORT)model developed earlier by the community is further enhanced to an advanced version(referred to as A-VDISORT)through an improved ocean surface *** Fresnel reflection matrix,which includes wind-generated roughness and shading effects,is served by an ocean bidirectional reflection distribution function(BRDF).The simulation from AVDISORT is compared with SCIATRAN for a Rayleigh scattering atmosphere,and the influence of water-leaving radiance is analyzed by the PSTAR(Polarized System for Transfer of Atmospheric Radiation) *** GaoFen-5 Directional Polarimetric Camera(DPC) observations with polarization and multi-angle information,clear-sky pixel recognition over the ocean is first carried *** DPC reflectance of clear conditions is normalized and compared with the *** is shown that A-VDISORT has a high simulation accuracy with a bias of –*** difference between simulation and observation exhibits a standard normal probability distribution function.

关键词： vector radiative transfer equation A-VDISORT ocean BRDF GF-5 DPC

来源：评论

学校读者我要写书评

暂无评论

Spatiotemporal influence of driving factors on water conservation in underdeveloped plateau regions: a case in the Yellow River Basin of Sichuan, China

引用

Journal of Mountain Science 2025年第4期22卷 1289-1305页

作者： WANG Xuan MA Lei LU Heng LIU Chao NIE Ruihua LI Naiwen TAN Xiao YANG Zhengli Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural ResourcesSchool of Geography and Ocean ScienceNanjing UniversityNanjing 210023China State Key Laboratory of Hydraulics and Mountain River Engineering College of Hydraulic and Hydroelectric EngineeringSichuan UniversityChengdu 610065China

The Yellow River Basin in Sichuan Province(YRS)is undergoing severe soil erosion and exacerbated ecological vulnerability,which collectively pose formidable challenges for regional water conservation(WC)and sustainable *** effectively enhancing WC necessitates a comprehensive understanding of its driving factors and corresponding intervention strategies,existing studies have largely neglected the spatiotemporal heterogeneity of both natural and socio-economic ***,this study explored the spatiotemporal heterogeneity of WC drivers in YRS using multi-scale geographically weighted regression(MGWR)and geographically and temporally weighted regression(GTWR)models from an eco-hydrological *** discovered that downstream regions,which are more developed,achieved significantly better WC than upstream *** results also demonstrated that the influence of temperature and wind speed is consistently dominant and temporally stable due to climate stability,while the influence of vegetation shifted from negative to positive around 2010,likely indicating greater benefits from understory *** growth positively impacted WC in upstream regions but had a negative effect in the more developed downstream *** findings highlight the importance of targeted water conservation strategies,including locally appropriate revegetation,optimization of agricultural and economic structures,and the establishment of eco-compensation mechanisms for ecological conservation and sustainable development.

关键词： Water conservation Multi-scale Geographically Weighted Regression Geographically and Temporally Weighted Regression The Yellow River Basin in Sichuan Province Spatiotemporal variation

来源：评论

学校读者我要写书评

暂无评论

Developing an analytical model for neighborhood-scale urban surface bidirectional reflectance incorporating three-dimensional structure

引用

IEEE Transactions on Geoscience and remote sensing 2025年

作者： Ye, Tiejun He, Tao Xu, Hongxin Ma, Yichuan Wuhan University Hubei Key Laboratory of Quantitative Remote Sensing of Land and Atmosphere School of Remote Sensing and Information Engineering Wuhan430079 China

The bidirectional reflectance factor (BRF) is a key parameter for understanding the radiative transfer process within cities, influenced by the sun-target-sensor geometry. Simulating urban BRF poses significant challenges due to the complex three-dimensional (3D) structures of urban landscapes. Previous attempts have been facing significant hurdles, either inadequately addressing the complexities of real-world urban structures or consuming too many computing resources. To overcome these challenges, this study introduces an analytical model - Urban Bidirectional Reflectance Analytical Model (UBRAM), which takes advantage of landscape-level geometric and radiometric parameters incorporating 3D urban structures to simulate the BRF of neighborhood-scale urban landscapes (100-1000m). UBRAM underwent verification using simulations from the well-known radiative transfer model (Discrete Anisotropic Radiative Transfer, DART) under various solar-illumination geometries and diverse urban morphologies. Results demonstrated a good agreement between UBRAM and DART, with an overall R2 ranging from 0.829 to 0.983 and the shape similarity index exceeding 0.99 in most scenes, underscoring the effectiveness of UBRAM. Notably, leveraging a modular design, UBRAM enables independent processing of 3D urban scenes and radiative transfer simulation, ensuring efficiency and scale applicability. This study establishes UBRAM as a viable model, offering a novel approach for quantifying BRF of neighborhood-scale urban surfaces. Moreover, UBRAM requires a limited number of easily obtainable parameters, facilitating its straightforward adaptation for application in other urban areas. UBRAM facilitates the simulation of radiative transfer processes based on 3D real-world urban models, thereby enhancing the accuracy of scene rendering and downstream applications such as urban heat island and environment monitoring. © 1980-2012 IEEE.

关键词： Radiative transfer

来源：评论

学校读者我要写书评

暂无评论

remote sensing of liquid cloud profiles based on an analytical cloud profiling model

引用

Science China Earth Sciences 2025年第4期68卷 998-1012页

作者： Huazhe SHANG Husi LETU Lesi WEI Run MA Yutong WANG Zhaoxin CAI Shuai YIN Chong SHI State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing100049China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science&EngineeringYibin644005China Meteorological Disasters Defense Technology Center Meteorological Bureau of Shanxi ProvinceTaiyuan030032China

The characteristics of microphysical profiles of liquid clouds(i.e.,the cloud effective radius(ER)and liquid water content(LWC))are important factors in understanding the aerosol-cloud-precipitation process and improving the evaluation of cloud radiative effects on a global ***,the profiling of clouds is limited to measurements such as radars or lidars,and retrievals from active sensors are influenced by the attenuation of signals and surface *** when vast amounts of cloud property retrievals that express column or cloud-top/base characteristics from passive sensors are generated,these two-dimensional cloud products are scarcely ever used to further produce three-dimensional cloud profiles because of the lack of a reasonable analytical model to bridge the ***,this study developed a cloud profile reconstruction model(CPRM)based on our previous analytical cloud profile model and evaluated the sensitivities of visible-to-infrared bands of passive cloud observation sensors to each parameter of the *** results indicated that the optical thickness,cloud-top ER,and geometrical thickness can be derived from multiwavelength measurements,whereas the slope of the cloud droplet number concentration(CDNC)and the cloud-base ER could hardly be directly ***,the analytical model was utilized to rebuild cloud profiles seen by CloudSat and *** analytical model could capture the shape and the vertical variations of the cloud ER and LWC.

关键词： Analytical cloud profiling model Cloud effective radius Cloud liquid water content CloudSat Airborne mea-surements

来源：评论

学校读者我要写书评

暂无评论

DSMF-Net: A One-Stage SAR Ship Detection Network Based on Deformable Strip Convolution and Multiscale Feature Refinement and Fusion

引用

IEEE Journal of Selected Topics in Applied Earth Observations and remote sensing 2025年 18卷 10694-10710页

作者： Liu, Xingyu Pan, Jun Hu, Rong Huang, Wenli Lin, Jiawei Hu, Jiarui Wuhan University School of Resources and Environmental Sciences Hubei 430079 China Wuhan University State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Hubei 430079 China Jilin University College of Geo-Exploration Science and Technology Key Laboratory of Geophysical Exploration Equipment Ministry of Education Changchun130021 China

Synthetic aperture radar (SAR), an all-weather and day-and-night remote sensing imaging technology, is crucial for ship detection. However, SAR images are hampered by speckle noise and coastal clutter, and ship targets exhibit multiscale and small-scale characteristics. To tackle these challenges, we introduce the DSMF-Net, a SAR ship detection network leveraging deformable strip convolution and multiscale feature refinement and fusion. First, to counter interference from complex backgrounds, such as nearshore ports and speckle noise, the deformable strip convolution (DSConv) is introduced and incorporated into the backbone network for SAR ship feature extraction, named SSFEBackbone. DSConv adaptively adjusts convolution sampling positions based on ship target characteristics, precisely extracting features with directional and strip structures. Second, the dual-stream self-attention feature refinement module is utilized to refine high-level semantic features. Through the mixing spatial and channel attention (MSCA) mechanism, differences and correlations between complex backgrounds and ship entities are further captured, enhancing feature expression. Finally, the adaptive selective feature pyramid network is proposed. By leveraging MSCA attention, high-level semantic and low-level spatial features are flexibly matched, enabling better key information retention during fusion and background clutter suppression, thus improving detection performance for complex backgrounds and multiscale ship targets. Experimental results demonstrate that DSMF-Net performs significantly better in ship detection in SAR images. It outperforms existing state-of-the-art methods on the SAR-Ship-Dataset, high-resolution SAR images dataset, and SAR ship detection dataset, achieving an AP50 of 96.8%, 93.1%, and 97.4%, respectively. © 2008-2012 IEEE.

关键词： Radar clutter

来源：评论

学校读者我要写书评

暂无评论

Prospects on mangrove knowledge services in the smart era:From plant atlas to knowledge graphs

引用

Science China Earth Sciences 2025年第1期68卷 111-127页

作者： Zhi-Wei HOU Wenlong JING Cheng-Zhi QIN Ji YANG Qing XIA Xiaoling YIN Key Laboratory of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of SciencesGuangzhou510070China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China School of Traffic&Transportation Engineering Changsha University of Science and TechnologyChangsha410114China

Mangroves are crucial to the ecological security of the Earth and human *** management,conservation,and restoration are of great importance and necessitate the support of spatio-temporal information and multidisciplinary knowledge such as biology and *** knowledge services such as plant atlas provide illustrated textual knowledge of ***,this kind of service is oriented to information retrieval and is incapable of effectively mining and utilizing fragmented knowledge from multi-source heterogeneous data,facing the problem of“massive data,rare knowledge”.Knowledge graphs are capable of extracting,organizing,and fusing the knowledge contained in massive data into semantic networks that can be understood and computed by *** provide a solution for the realization of intelligent knowledge *** on the urgent need for mangrove knowledge acquisition,formal representation,and intelligent services,this paper proposes a research prospect on mangrove knowledge graphs and knowledge *** first analyze the similarities and differences between various domain-specific concepts of *** this basis,we define the mangrove knowledge graph as a large-scale knowledge base that integrates multi-disciplinary knowledge and spatio-temporal information with mangrove ecosystems as the ***,we propose a research framework for mangrove knowledge services that can realize the transformation from multi-modal data to intelligent knowledge services,including multiple research levels such as ubiquitous data sensing and aggregation,knowledge organization and graph construction,and intelligent mangrove knowledge ***,the methods and workflow for constructing mangrove knowledge graphs are ***,we discuss the challenges and possible future directions of mangrove knowledge services in the smart era,including the construction of a mangrove knowledge system that integrates the domain-specific charac

关键词： Mangrove Tupu Knowledge graph Multi-modal Knowledge service

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：