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5th International Conference on Machine Vision (ICMV) - algorithms, Pattern Recognition and Basic Technologies

作者： Li, Chengling Rao, Ruonan Shanghai Jiao Tong Univ Software Sch Shanghai 200240 Peoples R China

ISBN: (纸本)9780819495884

In this paper, a novel RSSI-based position algorithm is proposed for Mobile ad hoc network. The proposed range-based position scheme is implemented by a blind node and several beacons. We show how to use parameters-tuning model and position-correction model to effectively compute a good estimation of the position of blind node. The results of our method in CC2431 indicate that the calculated distance is closer to the actual values and the position of the blind node can be computed in a small amount of time and that the quality of the solution is competitive with previous approaches.

关键词： RSSI position algorithm parameters-tuning beacon node Indoor position

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Doppler-Aided algorithm for BeiDou position

Doppler-Aided Algorithm for BeiDou Position

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4th China Satellite Navigation Conference (CSNC)

作者： Lei, Dengyun Lu, Weijun Yu, DunShan Peking Univ Inst Microelect Beijing Peoples R China Beijing Univ Posts & Telecommun Sch Elect Engn Beijing Peoples R China

ISBN: (纸本)9783642373985;9783642373978

Real-time GNSS positioning rely mainly on pseudorange and carrier-phase. The pseudorange is not accurate because of a lot of noise and interference in environment. High-precision carrier-phase used to smooth pseudorange. While, when cycle slip occurs, the carrier-phase measurement is bias. Unlike Carrier observations, the Doppler observations tend to have higher continuity. In Beidou system, GEO satellites local in geostationary orbit with lower dynamic. So, we can use the small noise bandwidth to improve the accuracy of measurement. This paper analyzes the characteristics and methods of Doppler-assisted positioning the the settlement equation using the weighted least squares method. The simulation and test results show that the positioning of the reliability of the results has been improved.

关键词： Doppler-aided BeiDou System position algorithm Least square

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Doppler-aided algorithm For BeiDou position

Doppler-aided Algorithm For BeiDou Position

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第四届中国卫星导航学术年会

作者： Dengyun Lei Weijun Lu DunShan Yu Institute of Microelectronics Peking University School of electronics engineering Beijing University of posts and Telecommunication

关键词： Doppler-aided BeiDou System position algorithm Least square

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Performance characterization of a novel thin position-sensitive avalanche photodiode-based detector for high resolution PET

Performance characterization of a novel thin position-sensit...

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Nuclear Science Symposium/Medical Imaging Conference

作者： Zhang, Jin Foudray, Angela M. K. Olcott, Peter D. Levin, Craig S. PerkinElmer Optoelect Santa Clara CA 95054 USA

ISBN: (纸本)0780392213

We are developing advanced dedicated breast and small animal positron emission tomography (PET) systems with detectors comprising arrays of 1 x 1 x 3 mm(3) LSO crystals coupled to novel, extremely thin position-sensitive avalanche photodiodes (PSAPD). This thin PSAPD is essential for achieving high crystal packing fraction for a PET system design which has 2 cm effective LSO crystal thickness, 1mm transaxial spatial resolution and 3 rum directly measured photon DOI resolution. These properties facilitate high detection efficiency and three dimensional positioning capability in the detector. With this very thin PSAPD, preliminary results indicated that we can expect I mm 3 intrinsic spatial resolution. We have observed an average of 1.1mm transaxial and 3mm DOI spatial resolution, similar to 11% energy resolution and similar to 2 ns temporal resolution. We have also implemented a position algorithm for reducing the effect of pincushioning on events detected over the face of the PSAPD.

关键词： position sensitive avalanche photodiode PSAPD positron emission tomography energy resolution coincidence time resolution position resolution position algorithm

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Improved positioning algorithm based on two step least square in NLOS environments

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 58-63页

作者： WU Shi-xun LI Ji-ping-yin LIU Shou Department of Electronics and Communication Engineering Central China Normal University Wuhan 430079 China

Non-line-of-sight （NLOS） propagation is a major source of error for accurate time-of-arrival （TOA） location estimation. The two-step least square （LS） method, which does not need any information about the distribution of the NLOS error, has been studied in related researches to provide efficient location estimation of the mobile terminal （MT）. By observing the estimation of the error covariance matrix in the two-step LS method, this paper finds that the measured distances are more suitable than the initial estimated distances by maximum likelihood （ML） algorithm in NLOS environments. Moreover, by making use of the geometry relations among fixed terminals （FTs）, some measured distances which are corrupted by big NLOS errors may be reduced. Further, an iteration method can be adopted to further improve the performance of the algorithm. Accordingly, an improved algorithm based on the two-step LS method is proposed. Simulation results demonstrate that the improved algorithm has better performance than the two-step LS method and converges more quickly. Meanwhile, it is robust in different NLOS environments.

关键词： NLOS propagation TOA least square position algorithm maximum likelihood

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Novel indoor positioning system based on ultra-wide bandwidth

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Visual Computing for Industry,Biomedicine,and Art 2020年第1期3卷 1-6页

作者： Zhen Wei Rui Jiang Xing Wei Yun-An Cheng Lei Cheng Cai Wang School of Computer and Information Hefei University of TechnologyHefei 230009China Engineering Research Center of Safety-critical Industry Measure and Control Technology of Ministry of Education Hefei 230009China School of Mechanical Engineering Hefei University of TechnologyHefei 230009China

To tackle challenges such as interference and poor accuracy of indoor positioning systems,a novel scheme based on ultra-wide bandwidth(UWB)technology is ***,we illustrate a distance measuring method between two UWB ***,a Taylor series expansion algorithm is developed to detect coordinates of the mobile node using the location of anchor nodes and the distance between *** results show that the observation error under our strategy is within 15 cm,which is superior to existing *** final experimental data in the hardware system mainly composed of STM32 and DW1000 also confirms the performance of the proposed scheme.

关键词： Indoor positioning Ultra-wide bandwidth position algorithm Hardware platform

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Design of 3D positioning algorithm Based on RFID Receiver Array for In Vivo Micro-robot

Design of 3D Positioning Algorithm Based on RFID Receiver Ar...

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8th IEEE International Conference on Dependable, Autonomic and Secure Computing

作者： Zhang, Le Zhu, Yongxin Mo, Tingting Hou, Jinlong Hu, Hao Shanghai Jiao Tong Univ Sch Microelect Shanghai 200030 Peoples R China

ISBN: (纸本)9780769539294

The clinical applications of capsule endoscopes have been increasing consistently since the invention of a passive capsule endoscope was made [1]. Though the capsule endoscopes are effective in detecting large lesions along human digestive tract, they cannot meet doctors' requirements of active control of the capsules to carefully examine small lesions. The poor precision of positioning system is one of the major hurdles blocking robots from approaching the accurate position of suspected areas. In this paper, we propose a novel algorithm to exploit the radiation patten of a radio frequency (RF) tag inside the capsule, which forms shadows or traces on a set of receiver arrays. According to the shape of the traces and the radiation pattern, the position of the radiation source, i.e. the tag inside the capsule can be calculated with our algorithm. The details of our algorithm are presented with the simulation results in the paper. With the settings under medical constraints, the degree of positioning precision in simulation is improved to less than 1cm horizontally and 2cm vertically.

关键词： position micro-robot RFID capsule endoscope position algorithm

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AN INDOOR SPACE PARTITION METHOD AND ITS FINGERPRINT positionING OPTIMIZATION CONSIDERING PEDESTRIAN ACCESSIBILITY 23

AN INDOOR SPACE PARTITION METHOD AND ITS FINGERPRINT POSITIO...

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23rd Congress of the International-Society-for-Photogrammetry-and-Remote-Sensing (ISPRS)

作者： Xu, Yue Shi, Yong Zheng, Xingyu Long, Yi Nanjing Normal Univ Sch Geog Sci Nanjing 210023 Jiangsu Peoples R China Nanjing Normal Univ Taizhou Coll Sch Informat Engn Taizhou 225300 Peoples R China

Fingerprint positioning method is generally the first choice in indoor navigation system due to its high accuracy and low cost. The accuracy depends on partition density to the indoor space. The accuracy will be higher with higher grid resolution. But the high grid resolution leads to significantly increasing work of the fingerprint data collection, processing and maintenance. This also might decrease the performance, portability and robustness of the navigation system. Meanwhile, traditional fingerprint positioning method use equational grid to partition the indoor space. While used for pedestrian navigation, sometimes a person can be located at the area where he or she cannot access. This paper studied these two issues, proposed a new indoor space partition method considering pedestrian accessibility, which can increase the accuracy of pedestrian position, and decrease the volume of the fingerprint data. Based on this proposed partition method, an optimized algorithm for fingerprint position was also designed. A across linker structure was used for fingerprint point index and matching. Experiment based on the proposed method and algorithm showed that the workload of fingerprint collection and maintenance were effectively decreased, and poisoning efficiency and accuracy was effectively increased.

关键词： In-door Navigation Space Partition Fingerprint position algorithm Pedestrian Accessibility

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A Novel NLOS Mitigation Approach for Wireless positioning System

A Novel NLOS Mitigation Approach for Wireless Positioning Sy...

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2010 3rd International Conference on Computer and Electrical Engineering(ICCEE 2010)

作者： Chen Jian Zhuo Yong-ning National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China

A Non-light-of-sight (NLOS) mitigation approach based on GBSBEM was proposed in this paper. The main idea is to model the NLOS errors to the elliptical model and mitigate them with a novel method. At the first step, the semi-minor of GBSBEM is estimated, then a way to restrain the NLOS errors with the help of the semi-minor is used. When the semi-minor can not be estimated, an optimization method based on GBSBEM pdf is presented. The method has a good effect to reduce the NLOS error, especially when the NLOS effect is notable.

关键词： nlos mitigation gbsbem position algorithm

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