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positioning accuracy of IGPS

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Journal of Harbin Institute of Technology(New Series) 2010年第2期17卷 219-224页

作者：于淼陈杰窦丽华甘明刚 School of Automation Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education

The positioning accuracy of a short-haul target-locating system,the inverse-GPS(IGPS) ,was analyzed in detail. The relationship between IGPS and the positioning error was discussed. The multiplicative error minimal bound of the geometric dilution of precision (GDOP) about the four-base-station IGPS was also investigated. In order to clarify the practical implementation of IGPS,the multiplicative and additive error factors which affect the positioning accuracy and theoretical estimation of positioning accuracy were presented. By analyzing the experiments of locating a target's position in virtual three-dimensional areas,the positioning performance of IGPS was illustrated. The results show that the multiplicative and additive error factors should be eliminated in IGPS to improve the positioning accuracy.

关键词： inverse-GPS(IGPS) GDOP positioning accuracy

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Comparison of density and positioning accuracy of PS extracted from super-resolution PSI with those from traditional PSI

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Journal of Systems Engineering and Electronics 2021年第6期32卷 1318-1324页

作者： ZHANG Hao CUI Bin GUAN Zhichao DUN Han School of Geographic and Biologic Information Nanjing University of Posts and TelecommunicationsNanjing 210049China Beijing Key Laboratory of Urban Spatial Information Engineering Beijing 100038China State Key Laboratory of Informa-tion Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Department of Geoscience and Remote Sensing Delft University of TechnologyDelft 2628the Netherlands

In the application of persistent scatterer interferometry(PSI),deformation information is extracted from persistent scatterer(PS)points.Thus,the density and position of PS points are critical for PSI.To increase the PS density,a time-series InSAR chain termed as"super-resolution persistent scatterer interferometry"(SR-PSI)is proposed.In this study,we investigate certain important properties of SR-PSI.First,we review the main workflow and dataflow of SR-PSI.It is shown that in the implementation of the Capon algorithm,the diagonal loading(DL)approach should be only used when the condition number of the covariance matrix is sufficiently high to reduce the discontinuities between the joint images.We then discuss the density and positioning accuracy of PS when compared with traditional PSI.The theory and experimental results indicate that SR-PSI can increase the PS density in urban areas.However,it is ineffective for the rural areas,which should be an important consideration for the engineering application of SR-PSI.Furthermore,we validate that the positioning accuracy of PS can be improved by SRPSI via simulations.

关键词： super resolution persistent scatterer interferometry(PSI) positioning accuracy

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Performance improvement of 5G positioning utilizing multi-antenna angle measurements

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Satellite Navigation 2022年第3期3卷 193-206,I0005页

作者： Wenfei Guo Yue Deng Chi Guo Shufeng Qi Jingrong Wang Wuhan University WuhanHubeiChina

Time delay-based the 5th Generation Mobile Communication Technology(5G)positioning is a main method to perform high-precision positioning in Global Navigation Satellite System(GNSS)denied areas.However,in practical applications,the occlusion of signals in a complex environment results in few observable base stations,which affects the reliability and accuracy of positioning.The aim of this study is to improve the performance of the 5G positioning in complex environments with an insufficient number of observable base stations.First,the Angle of Departure(AOD)capability of multi-antennas is integrated into Multi-Round-Trip-Time(Multi-RTT)positioning,establishing a novel 5G RTT/AOD positioning model.Then,the influencing factors of positioning performance,including the Dilution of Precision(DOP)and the accuracy of the AOD measurements,is analyzed.The relationship between DOP and RTT/AOD positioning accuracy is deduced.Afterwards,simulation experiments are performed on 5G positioning with the Multi-RTT and RTT/AOD methods in two scenarios with good and complex environments.The theoretical analysis and experimental results show that 5G positioning with the RTT/AOD method increases the horizontal and vertical accuracies by approximately 25 and 65%,respectively,compared with the Multi-RTT method.The positioning reliability is also greatly improved.The proposed model can well solve the inefficiency of 5G positioning with the RTT method in scenarios where the number of base stations is less than three.

关键词： 5G positioning Angle of departure positioning accuracy positioning reliability

Performance analysis of two RDSS positioning modes of BeiDou-3 system

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Astrodynamics 2022年第3期6卷 317-327页

作者： Dongxia Wang Rui Guo Nan Xing Zhijun Liu Tianqiao Zhang Hui Ren Xiaojie Li Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Operation Control Department Beijing Satellite Navigation CenterBeijing 100094China Astronomy Department Beijing Normal UniversityBeijing 100875China

The BeiDou-3 global satellite navigation system(BDS-3)provides two radio determination satellite service(RDSS)positioning services for users,i.e.,the traditional RDSS(TRDSS)positioning of the BeiDou-2 regional satellite navigation system,and the comprehensive RDSS(CRDSS)positioning,which integrates the RDSS and radio navigation satellite service.As published studies regarding the RDSS positioning service are few,we analyze and compare the performances of the two RDSS positioning modes.First,we systematically investigate the principles of the TRDSS and CRDSS positioning,and then analyze the evaluation methods in terms of their positioning accuracy,real time,and coverage range.Second,based on the BeiDou RDSS measured data,we evaluate the performances of the TRDSS and CRDSS positioning.Compared with TRDSS positioning,CRDSS positioning exhibits the following:1)A significant increase in positioning accuracy,resulting in error improvement from 8 to 2 m and root mean square improvement from 3.13 to 0.85 m;in other words,the positioning error,constant deviation,and stability improve significantly.2)The real time reduces slightly from 1.1 to 1.8 ns,which is within the acceptable range.3)The coverage range expands from the areas of 62°E-145°E and 5°N-55°N to the areas of 50°E-170°E and 0°N-70°N,respectively.4)CRDSS positioning is not restricted by the constraints of the digital elevation database or the user elevation information and can thus solve the occlusion problem effectively.

关键词： TRDSS positioning CRDSS positioning positioning accuracy real time coverage range

A Review of Device-Free Indoor positioning for Home-Based Care of the Aged:Techniques and Technologies

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 1901-1940页

作者： Geng Chen Lili Cheng Rui Shao Qingbin Wang Shuihua Wang College of Electronic and Information Engineering Shandong University of Science and TechnologyQingdao266590China School of Computer Science and Technology Henan Polytechnic UniversityJiaozuo454000China

With the development of urbanization,the problem of neurological diseases brought about by population aging has gradually become a social problem of worldwide concern.Aging leads to gradual degeneration of the central nervous system,shrinkage of brain tissue,and decline in physical function in many elderlies,making them susceptible to neurological diseases such as Alzheimer’s disease(AD),stroke,Parkinson’s and major depressive disorder(MDD).Due to the influence of these neurological diseases,the elderly have troubles such as memory loss,inability to move,falling,and getting lost,which seriously affect their quality of life.Tracking and positioning of elderly with neurological diseases and keeping track of their location in real-time are necessary and crucial in order to detect and treat dangerous and unexpected situations in time.Considering that the elderly with neurological diseases forget to wear a positioning device or have mobility problems due to carrying a positioning device,device-free positioning as a passive positioning technology that detects device-free individuals is more suitable than traditional active positioning for the home-based care of the elderly with neurological diseases.This paper provides an extensive and in-depth survey of device-free indoor positioning technology for home-based care and an in-depth analysis of the main features of current positioning systems,as well as the techniques,technologies andmethods they employ,fromthe perspective of the needs of the elderly with neurological conditions.Moreover,evaluation criteria and possible solutions of positioning techniques for the home-based care of the elderly with neurological conditions are proposed.Finally,the opportunities and challenges for the development of indoor positioning technology in 6G mobile networks for home-based care of the elderly with neurological diseases are discussed.This review has provided comprehensive and effective tracking and positioning techniques,technologies and methods for the elderly,by which we can obta

关键词： Home-based care device-free neurological diseases indoor positioning positioning techniques and technologies positioning accuracy

positioning error compensation for parallel mechanism with two kinematic calibration methods

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Chinese Journal of Aeronautics 2020年第9期33卷 2472-2489页

作者： Guohua ZHAO Dan WANG Liangbao LIU Jiangzhen GUO Wuyi CHEN He LI School of Mechanical Engineering and Automation Beihang UniversityBeijing 100083China School of Electric and Automatic Engineering Changshu Institute of TechnologyChcmgshu 215500China AVIC Aviation High-Technology Co. LtdNantong 226011China

Compared with serial mechanisms, the parallel mechanism(PM) theoretically exhibited higher positioning accuracy, dynamic performance, strength-to-weight ratio, and lower manufacturing cost, but they had not been widely used in the practical application. One key issue, positioning accuracy, which directly affected their performance and was greatly influenced by the errors of kinematic structure parameters was analyzed. To effectively enhance the positioning precision of PMs, a novel modeless kinematic calibration method, namely the split calibration, was presented and its compensation effect of the positioning error was comprehensively compared with that of an integrated method on two different types of PMs. A strange phenomenon-correct and incorrect identified results were derived from two different PMs by the same integrated method, respectivelywhich had not been reported yet was discovered, and the origin of it was revealed utilizing numerical simulations. Finally, respective merits and drawbacks of these two methods obtained in this paper provided underlying insights to guide the practical application of the kinematic calibration for PMs.

关键词： Compensation effect Kinematic calibration Parallel mechanism positioning accuracy Structure parameters

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A Layout Method of Space-Based Pseudolite System Based on GDOP Geometry

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Chinese Journal of Electronics 2023年第5期32卷 1050-1058页

作者： YANG Xin WANG Feixue LIU Wenxiang XIAO Wei YE Xiaozhou National University of Defense Science and Technology

The pseudolite system can be used to provide positioning and timing service for users in a specific area. In order to provide better positioning and timing service, a good geometric configuration needs to be formed for the pseudolite system. For the problem of pseudolite system deployment, the average and mean square values of geometric dilution of precision(GDOP)are optimized in this paper for users in a target area. We proposed a space-based pseudolite deployment method based on GDOP geometry, starting from the minimum GDOP value for users in the central area. From the simulation results, it can be seen that, compared with the empirical method and the NSGA-II method, the method in this paper has the smallest average GDOP, a better robustness, and a higher positioning accuracy in the target area, through which a pseudolite deployment proposal can be quickly obtained.

关键词： Pseudolite positioning accuracy Geometric dilution of precision Geometry structure

Analysis of positioning accuracy for COMPASS based on Single/multi frequency Pseudo-range

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Analysis of Positioning Accuracy for COMPASS based on Single...

New Three-Dimensional Assessment Model and Optimization of Acoustic positioning System

第四届中国卫星导航学术年会

作者： Yongxing Zhu Xiaolin Jia Liang Yu Xi'an Research Institute of Surveying & Mapping Xi'an Surveying and Mapping Station

Compass/Beidou satellite navigation system makes it possible for positioning using three frequencies for the first time. Single frequency pseudo-range measurement and multi-frequency combination pseudo-range measurement are introduced;single & dual frequency positioning accuracy of raw & smooth pseudo-range are analyzed;and the single point availability for different accuracy demands at Lintong station is counted. Results show that: the noise of the ionosphere free using triple-frequency combination is amplified as much as the one using dual frequency combination by eliminating only the first order ionosphere delay;and the amplification is 30 times by eliminating both the first and second order ionosphere delay;pseudo-range positioning errors less than 10 meters takes up about 95% for single & dual frequency pseudo-range;and the single point availability for 10 meters, 15 meters and 20 meters (both level and height errors) take up about 95%, 99% and 100% at the this station.

关键词： Beidou Satellite Navigation System Multi-frequency Combination Pseudo-range Measurement Smooth Pseudo-range positioning positioning accuracy Availability

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Computers, Materials & Continua 2020年第8期64卷 1005-1023页

作者： Lin Zhao Xiaobo Chen Jianhua Cheng Lianhua Yu Chengcai Lv Jiuru Wang College of Automation Harbin Engineering UniversityHarbin150001China Department of Electrical and Electronic Engineering The University of MelbourneVictoria3010Australia College of Information and Communication Harbin Engineering UniversityHarbin150001China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya572000China School of Information Science and Engineering Linyi UniversityLinyi276005China

This paper addresses the problem of assessing and optimizing the acoustic positioning system for underwater target localization with range measurement.We present a new three-dimensional assessment model to evaluate the optimal geometric beacon formation whether meets user requirements.For mathematical tractability,it is assumed that the measurements of the range between the target and beacons are corrupted with white Gaussian noise with variance,which is distance-dependent.Then,the relationship between DOP parameters and positioning accuracy can be derived by adopting dilution of precision(DOP)parameters in the assessment model.In addition,the optimal geometric beacon formation yielding the best performance can be achieved via minimizing the values of geometric dilution of precision(GDOP)in the case where the target position is known and fixed.Next,in order to ensure that the estimated positioning accuracy on the region of interest satisfies the precision required by the user,geometric positioning accuracy(GPA),horizontal positioning accuracy(HPA)and vertical positioning accuracy(VPA)are utilized to assess the optimal geometric beacon formation.Simulation examples are designed to illustrate the exactness of the conclusion.Unlike other work that only uses GDOP to optimize the formation and cannot assess the performance of the specified size,this new three-dimensional assessment model can evaluate the optimal geometric beacon formation for each dimension of any point in three-dimensional space,which can provide guidance to optimize the performance of each specified dimension.

关键词： Acoustic positioning system three-dimensional assessment model positioning accuracy DOP optimal configuration