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Research on the Construction of Group Elderly Care Service Platform Based on IoT Technology

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Journal of Electronic Research and Application 2024年第2期8卷 68-73页

作者： Jialu Li Jianan Weng weiming tian Hunan University of Information Technology Changsha 410000China Chongqing Telecommunication Polytechnic College Chongqing 402247China

Internet of Things(IoT)technology is widely used in various fields,and its application in elderly care services has been highlighted in recent *** study aims to explore how IoT technology can improve the efficiency of group-based elderly care *** concept,characteristics,and current application status of IoT technology in elderly care services were ***,the characteristics and needs of group elderly care services were analyzed,including advantages and challenges,as well as the expectations and needs of the elderly for elderly care *** evaluation methods and future development directions of IoT technology in improving the efficiency of group elderly care services were discussed,including data collection and analysis methods,selection and measurement of efficiency evaluation indicators,challenges,and development directions.

关键词： Internet of Things technology Group-based elderly care services Efficiency improvement

Construction and Application of a Quality Evaluation System for Group Elderly Care Services Based on the Internet of Things

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Proceedings of Business and Economic Studies 2024年第1期7卷 155-161页

作者： Xiyu Yang Jialu Li weiming tian Hunan University of Information Technology Changsha 410000China Chongqing Telecommunication Polytechnic College Chongqing 400000China

With the continuous intensification of global aging,the issue of elderly care has become an increasingly prominent social *** Internet of Things(IoT)technology,as an emerging field,holds broad application *** article focuses on the application of IoT technology in group elderly care services and constructs a quality evaluation system for these services based on IoT *** the analysis of practical application cases,the advantages and challenges of IoT technology in group elderly care services have been examined,confirming the feasibility and effectiveness of the evaluation system.

关键词： Internet of Things Group retirement Quality assessment system

A novel subsidence monitoring technique based on space-surface bistatic differential interferometry using GNSS as transmitters

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Science China(Information Sciences) 2015年第6期58卷 68-83页

作者： ZENG Tao ZHANG tian tian weiming HU Cheng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Radar Research Laboratory School of Information and ElectronicsBeijing Institute of Technology

Synthetic Aperture Radar Differential Interferometry(DIn SAR) technique is an effective tool with large coverage and high spatial accuracy for subsidence monitoring. Nevertheless, the temporal resolution is usually poor so that rapid deformation cannot be measured due to the long revisit time of radar *** SAR Differential Interferometry technique using Global Navigation Satellite System(GNSS) as illuminator has a shorter revisit time, whereas the measurement accuracy is constrained by low signal power, narrow bandwidth and atmospheric delay error. To cope with these problems, in this paper, we propose a novel subsidence monitoring technique based on Space-Surface bistatic Differential Interferometry(SS-DI) with GNSS transmitters, where two stations consist of a reference one and a measurement one that are deployed on the ground. First, we applied a space differential processing between two stations to cancel identical errors such as tropospheric and ionospheric errors etc. Then we used a long time coherent integration to improve the signal noise ratio. Subsequently, we also utilized a time differential processing to construct double differential equations with respect to unknown deformation variables. Finally, we solved the equations to obtain a highly accurate estimation of three dimension deformation. Furthermore, an SS-DI experiment using Beidou-2 as transmitters was carried out to validate the proposed method, where a high accuracy(0.01 mm) device was utilized to simulate subsidence deformation. The experimental results reveal that the proposed method has better performance of spatial measurement accuracy of 0.53 mm compared with differential GPS method.

关键词： differential interferometry subsidence monitoring Beidou-2/Compass-2 space-surface bistatic radar differential GPS

Multistatic ground-based differential interferometric MIMO radar for 3D deformation measurement

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Science China(Information Sciences) 2021年第12期64卷 248-249页

作者： Cheng HU Yunkai DENG weiming tian School of Information and Electronics Beijing Institute of Technology

Deformation measurement is crucial for forecasting landslide hazards of natural and engineered slopes. Ground-based differential interferometric radar(GB-DInRad) uses phase differential interferometric technology for ... 详细信息

关键词： GB-MIMO radar 3-D deformation measurement multi-static radar system differential interferometry GB-SAR

Partition of GB-InSAR deformation map based on dynamic time warping and k-means

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Journal of Systems Engineering and Electronics 2022年第4期33卷 907-915页

作者： tian weiming DU Lin DENG Yunkai DONG Xichao Radar Research Lab School of Information and ElectronicsBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Electronic and Information Technology in Satellite Navigation(Beijing Institute of Technology) Ministry of EducationBeijing 100081China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Centre Chongqing 401120China Advanced Technology Research Institute Beijing Institute of TechnologyJi'nan 250300China

Ground-based interferometric synthetic aperture radar(GB-InSAR)can take deformation measurement with a high *** of the GB-InSAR deformation map benefits analyzing the deformation state of the monitoring scene *** partition methods rely on labelled datasets or single deformation feature,and they cannot be effectively utilized in GBInSAR *** paper proposes an improved partition method of the GB-InSAR deformation map based on dynamic time warping(DTW)and *** DTW similarities between a reference point and all the measurement points are calculated based on their time-series *** the DTW similarity and cumulative deformation are taken as two partition *** the k-means algorithm and the score based on multi evaluation indexes,a deformation map can be partitioned into an appropriate number of *** datasets of West Copper Mine are processed to validate the effectiveness of the proposed method,whose measurement points are divided into seven classes with a score of 0.3151.

关键词： ground-based interferometric synthetic aperture radar(GB-InSAR) deformation map partition dynamic time warping(DTW) k-means

Constrained geometry analysis to resolve 3-D deformations from three ground-based radars

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Journal of Systems Engineering and Electronics 2021年第6期32卷 1263-1269页

作者： DENG Yunkai ZHU Jiaxin tian weiming HU Cheng YANG Wenyu Radar Research Lab School of Information and ElectronicsBeijing Institute of TechnologyBeijing 100081China Key Labo-ratory of Electronic and Information Technology in Satellite Navigation Ministry of EducationBeijing Institute of TechnologyBeijing 100081China Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges Reservoir Area Chongqing Three Gorges UniversityChongqing 404000China Advanced Technology Research Insti-tute Beijing Institute of TechnologyJi’nan 250300China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

When multiple ground-based radars(GB-rads)are utilized together to resolve three-dimensional(3-D)deformations,the resolving accuracy is related with the measurement geometry constructed by these *** paper focuses on constrained geometry analysis to resolve 3-D deformations from three *** geometric dilution of precision(GDOP)is utilized to evaluate 3-D deformation accuracy of a single target,and its theoretical equation is derived by building a simplified 3-D coordinate *** for a 3-D scene,its optimal accuracy problem is converted into determining the minimum value of an objective function with a boundary *** genetic algorithm is utilized to solve this constrained optimization *** simulations are made to validate the correctness of the theoretical analysis results.

关键词： three-dimensional(3-D)deformation ground-based radar(GB-rad) constrained geometry geometric dilution of precision(GDOP) accuracy evaluation

Feasibility study of inclined geosynchronous SAR focusing using Beidou IGSO signals

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Science China Earth Sciences 2016年第12期59卷 240-242页

作者： Xichao DONG Cheng HU weiming tian tian ZHANG Yuanhao LI Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology

Dear editor,Geosynchronous synthetic aperture radar(GEO SAR)[1,2]has an inclined geosynchronous orbit of around 36000 km,which leads to its short revisit time of around 24 hours and a wide coverage of up to approximately one third of the Earth *** long integration time guarantees the fine ***,GEO SAR owns the promising capability of providing images with the high resolution,

关键词：倾斜地球同步轨道 SAR 北斗聚焦信号

DEM generation using bistatic interferometry:high-coherence pixel selection and residual reference phase compensation

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Science China(Information Sciences) 2015年第6期58卷 25-38页

作者： ZENG Tao ZHU Mao HU Cheng tian weiming ANTONIOU Michail Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology School of Electronic Electrical and Systems Engineering University of Birmingham

The bistatic spaceborne/stationary In SAR configuration could be applied to generate digital elevation model(DEM). However, two factors limit the DEM precision improvement. On one hand, due to the effects of the illuminator’s sidelobe and the high objects’ shadow, the pixels in the corresponding area might be polluted by the noise. On the other hand, owing to the presence of deviation(between the real value and the nominal value of the master/slave antenna positions), after utilizing the nominal value to compensate for the reference phase, the residual reference phase would remain. In order to solve the problems, we proposed a new bistatic DEM generation algorithm. Firstly, we applied the coherence-phase joint analysis method to select high-coherence points. Secondly, we deduced the transforming relationship from the deviation to the residual reference phase, and then compensated for the residual reference phase. In the experiment, the Yao Gan-3(an L-band spaceborne SAR) was selected as the transmitter and the two stationary receivers were mounted on the top of a tall building. The algorithm recommended in this paper was applied to process the measured bistatic data. The analysis of the results demonstrated that the elevation error of the generated DEM for some targets had been limited to the level of 1–2 m.

关键词： bistatic In SAR high coherence pixel DEM SAR bistatic SAR

High-precision deformation monitoring algorithm for GBSAR system: rail determination phase error compensation

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Science China(Information Sciences) 2016年第8期59卷 204-219页

作者： Cheng HU Mao ZHU Tao ZENG weiming tian Cong MAO Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology

In recent years, the repeat-pass GBSAR(ground based synthetic aperture radar) system has demonstrated its capacity to acquire deformation. Nevertheless, in a variety of applications, it needs to measure the deformation with the precision up to 0.1 mm, which could not be reached by utilizing the traditional PS(permanent scatterer) algorithm in most cases. Generally, one of the main reasons could be summarized into the phase error caused by the rail determination error, because the precision of rail determination might degrade during long working hours. However, the traditional PS algorithm could not compensate for the phase error caused by the rail determination error. In order to solve the problems, we modify the conventional PS ***, we deduced the transformation relationship between the rail determination error and its corresponding interferometric phase error. Then, the phase errors caused by the atmosphere and the rail determination error were jointly compensated. The experimental data, which were obtained in Fangshan District in Beijing(China), were used to test and verify the performance of the new algorithm. After the comparison between the results processed by the new algorithm and those processed by the traditional algorithm, the proposed method demonstrated its ability to obtain high-precision deformation.

关键词： permanent scatterer(PS) synthetic aperture radar(SAR) ground-based SAR deformation monitoring radar