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IEEE International Conference on Mechatronics & Automation

作者： Xu, Zili He, Donglin Tang, Yong Li, Jing CAAC Res Inst 2 R&D Ctr Chengdu Sichuan Provinc Peoples R China

ISBN: (纸本)9781479970988

MLAT (Multilateration) techniques have been successfully deployed for airport surveillance for quite some time now, it makes use of signals transmitted by an aircraft to calculate the position of aircraft. However, Multilateration techniques when applied in a wide area surveillance environment for aircraft target positioning, for the impact of Geometric Dilution of Precision (GDOP), the three-dimensional positioning algorithm for target positioning may result in relatively low positioning accuracy, and even cause divergence. For partial response signals transmitted by the civil aviation airborne secondary transponder contain target pressure altitude, the MLAT algorithm based on target pressure altitude can correct the three-dimensional positioning algorithm, reduce the dimensions of positioning equations, ensure algorithm convergence and increase positioning accuracy. The test results based on the practical application system illustrates the MLAT algorithm based on target pressure altitude is more accurate than the traditional three-dimensional positioning algorithm alone.

关键词： MLAT(multilateration) positioning algorithm target pressure altitude

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High-precision positioningSystem of Four-quadrant DetectorBased on the Database Query

High-precision PositioningSystem of Four-quadrant DetectorBa...

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International Conference on Photonics and Optical Engineering (icPOE)

作者： Zhang Xin Deng Xiao-guo Su Xiu-qin Zheng Xiao-qiang Chinese Acad Sci Xian Inst Opt & Precis Mech Xian 710119 Peoples R China Chinese Acad Sci Grad Univ Beijing 100049 Peoples R China

ISBN: (纸本)9781628415650

The fine pointing mechanism of the Acquisition, Pointing and Tracking (APT) system in free space laser communication usually use four-quadrant detector (QD) to point and track the laser beam accurately. The positioning precision of QD is one of the key factors of the pointing accuracy to APT system. A positioning system is designed based on FPGA and DSP in this paper, which can realize the sampling of AD, the positioning algorithm and the control of the fast swing mirror. We analyze the positioning error of facular center calculated by universal algorithm when the facular energy obeys Gauss distribution from the working principle of QD. A database is built by calculation and simulation with MatLab software, in which the facular center calculated by universal algorithm is corresponded withthe facular center of Gaussian beam, and the database is stored in two pieces of (EPROM)-P-2 as the external memory of DSP. The facular center of Gaussian beam is inquiry in the database on the basis of the facular center calculated by universal algorithm in DSP. The experiment results show that the positioning accuracy of the high-precision positioning system is much better than the positioning accuracy calculated by universal algorithm.

关键词： four-quadrant detector positioning algorithm database query FPGA DSP

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Optimal KNN positioning algorithm via Theoretical Accuracy Criterion in WLAN Indoor Environment

Optimal KNN Positioning Algorithm via Theoretical Accuracy C...

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IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Xu, Yubin Zhou, Mu Meng, Weixiao Ma, Lin Harbin Inst Technol Commun Res Ctr Harbin 150001 Peoples R China

ISBN: (纸本)9781424456383

This paper proposes the optimal K nearest neighbors (KNN) positioning algorithm via theoretical accuracy criterion (TAC) in wireless LAN (WLAN) indoor environment. As far as we know, although the KNN algorithm is widely utilized as one of the typical distance dependent positioning algorithms, the optimal selection of neighboring reference points (RPs) involved in KNN has not been significantly analyzed. Therefore, in order to fill this gap, the optimal KNN positioning algorithm based on the best TAC is introduced. And this algorithm is beneficial to construct the reliable WLAN indoor positioning system and provide the efficient location based services (LBSs). The relationship among theoretical expectation accuracy, unit interval of neighboring RPs and dimensions of target location region is also revealed. Furthermore, the feasibility and effectiveness of optimal KNN positioning algorithm are verified based on the experimental comparisons respectively in the regular office room, straight corridors, static positioning and dynamic tracking situations.

关键词： accuracy criterion WLAN positioning algorithm radio fingerprint expectation error

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Received signal strength based positioning for multiple nodes in wireless sensor networks

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DIGITAL SIGNAL PROCESSING 2014年第0期25卷 41-50页

作者： Lin, Lanxin So, H. C. Chan, Y. T. City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China Royal Mil Coll Canada Dept Elect & Comp Engn Kingston ON K7K 7B4 Canada

We address the problem of locating multiple nodes in a wireless sensor network with the use of received signal strength (RSS) measurements. In RSS based positioning, transmit power and path-loss factor are two environment dependent parameters which may be uncertain or unknown. For unknown transmit powers, we devise two-step weighted least squares (WLS) and maximum likelihood (ML) algorithms for node localization. The mean square error of the former is analyzed in the presence of zero-mean white Gaussian disturbances. When both transmit powers and path-loss factors are unavailable, two nonlinear least squares estimators, namely, the direct ML approach and combination of linear least squares and ML algorithm, are developed. Numerical examples are also included to evaluate the localization accuracy of the proposed estimators by comparing with two existing node positioning methods and the Cramer-Rao lower bound. (C) 2013 Elsevier Inc. All rights reserved.

关键词： Wireless sensor network Source localization Received signal strength positioning algorithm

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An Improved Location algorithm for BDS based on time delay estimation

An Improved Location Algorithm for BDS based on time delay e...

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作者： Fei SHEN Zhurong WANG Wei LI Xu LI Wennan Wu Xiaoran GUO JiangSu BDS Application Industry Institute. LTD.

Combining the advantages of Chan algorithm and Taylor series expansion method, the article has proposed an improved localization algorithm in the BDS positioning system. The algorithm eliminates much deviation of the positioning results in Chan algorithm, offers the optimized result as the initial value of Taylor series expansion method, then get the weighted sum of the positioning of the results of the two kinds of algorithm, finally put the final result as the location of the mobile station coordinates. Experimental results show that the proposed algorithm can effectively improve the positioning precision in the noise environment.

关键词： BDS Chan algorithm Taylor Series Method positioning algorithm

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Indoor Three-Dimensional positioning Method Based on CSS

Indoor Three-Dimensional Positioning Method Based on CSS

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International Conference on Mechatronics Engineering and Computing Technology (ICMECT)

作者： Liu, Gaoping Zhang, Jinyan Yang, Ruxiang Zhejiang Wanli Univ EDA Key Lab Ningbo Peoples R China Ningbo Homever Intelligent Technol Co Ltd Ningbo Peoples R China

ISBN: (纸本)9783038351153

This paper designs a three-dimensional positioning scheme suitable for indoor, adopts Chirp Spread Spectrum (CSS) and the particular Symmetric Double-Sided Two-Way Ranging (SDS-TWR). Combining BMP085 pressure sensor to measure altitude, it can implement three-dimensional positioning of a moving object in indoor. Due to the complex indoor environment would cause multipath effect when Chirp signal being transmitted, this scheme uses Kalman filtering method to filter out mutative coordinate value, thus the positioning error can be controlled within 1 m.

关键词： CSS three-dimensional positioning algorithm Kalman filter

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New Virtual Frisch-Grid CdZnTe Detector Design With Sub-Millimeter Spatial Resolution

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE 2014年第5期61卷 2567-2572页

作者： Lee, Kisung Bolotnikov, Aleksey Bae, Seungbin Roy, Utpal Camarda, Giuseppe Petryk, Matthew Cui, Yonggang Hossain, Anwar Yang, Ge Dedic, Vaclav Kim, Kihyun James, Ralph B. Korea Univ Seoul 136701 South Korea Brookhaven Natl Lab Upton NY 11973 USA SUNY Binghamton Binghamton NY 13902 USA Charles Univ Prague CR-11636 Prague Czech Republic

We evaluated the performance of a position-sensitive virtual Frisch-grid (VFG) CdZnTe detector, mm mm mm, via sensing strips on its side surfaces. Once the signals were collected from the anode, and from four or eight strips attached to the detector's sides, we assessed the anode's energy spectra and derived histograms from the side electrodes to evaluate the feasibility of achieving sub-millimeter spatial resolution in the X-Y plane. Using a highly collimated 30-keV X-ray beam at the National Synchrotron Light Source, and applying corrections to the raw data, we determined the photon-interaction points by conventional Anger logic and via a more sophisticated statistics-based positioning (SBP) algorithm. With the VFG detector's current configuration, we achieved a resolution below 1 mm, even for low-energy X-rays.

关键词： CdZnTe Frisch-grid position-sensitive positioning algorithm radiation detector

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Multidimensional scaling approach for node localization using received signal strength measurements

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DIGITAL SIGNAL PROCESSING 2014年 34卷 39-47页

作者： Lin, Lanxin So, H. C. Chan, Frankie K. W. City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China

Node localization has played an important role in wireless sensor networks. In this paper, cooperative localization using received signal strength (RSS) measurements is addressed. The technique of weighted multidimensional scaling (WMDS) which relies on pairwise distance information between nodes is utilized in our algorithm development. Assuming that the transmit power is available, we first convert the original nonlinear localization problem to a system of linear equations, leading to computational attractiveness. It is also proved that the positioning accuracy of the WMDS solution attains the Cramer-Rao lower bound at sufficiently small noise conditions. Furthermore, the proposed method is extended to the unknown transmit power case by exploiting the ratio of squared distance estimates extracted from the RSS information. The effectiveness of the WMDS approach is demonstrated via comparison with several conventional RSS-based positioning methods. (C) 2014 Elsevier Inc. All rights reserved.

关键词： Node localization Received signal strength positioning algorithm Multidimensional scaling

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PD positioning Method and Experimental Study Based on Circular-shaped Ultrasonic Array Sensors

PD Positioning Method and Experimental Study Based on Circul...

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International Conference on Power System Technology (PowerCon)

作者： Li Yanqing Wang Fei Wang Chuan Hu Weitao Xie Qing Tao Junhan North China Elect Power Univ Baoding Baoding City Hebei Province Peoples R China

ISBN: (纸本)9781479950324

PD ultrasound array positioning method is one of the latest achievements in the field of array sensor technology and array signal processing technology. This method can achieve spatial orientation and on-line monitoring of partial discharge source effectively. Ultrasonic array sensor was developed rapidly in the past forty years, its application involves many areas of military and national such as radar, exploration, sonar, communications, seismology, radio astronomy, biomedical engineering, etc. Previous studies showed that the positioning performance of circular-shaped array sensor is superior to the square, linear array sensor and other forms. Therefore, we undertook in-depth study in allusion to circular-shaped ultrasonic array sensor. Contents of this paper are summed up in the following three aspects. Firstly, this paper developed a circular-shaped ultrasonic array sensor. We carried out a detailed and comprehensive investigation on structures, materials and size parameters of array sensor elements and assemblies, and we combined with the specific characteristics of PD ultrasound signals, then we determine the structure of array sensor elements and its main parameters: the dimensions of probe and tail are Phi 7.8x13mm Phi 5.2x13mm, the frequency range is 70kHz-280kHz, etc. The assembly is made of aviation aluminum materials, its sizes are as follows: length is 50mm, width is 40mm, the cylindrical bores in circular-shaped ultrasonic array sensor assemblies are arranged in a circular ring shape, the diameter of the cylindrical bore is 5.2mm, and the depth of the cylindrical bore is 5mm. We get circular-shaped ultrasonic array sensor by assembling ultrasonic array sensor elements and array sensor assembly. Secondly, since the actual PD ultrasonic signals from electrical equipments are wideband signals, we adopt rotational signal subspace (RSS) algorithm to focus processing, which can reserve the information maximally to realize the direction information accumulat

关键词： partial discharge circular-shaped ultrasound array sensor positioning algorithm experimental system

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Remote Position Detection of Steel Coils Using 2D Laser Scanners: Two-line-tracker 14

Remote Position Detection of Steel Coils Using 2D Laser Scan...

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14th International Conference on Control, Automation and Systems (ICCAS)

作者： Kim, Yonghun Kim, Pyungkang Cho, Kyeongyong Hong, Yoon-Shik Kim, Soohyun Kim, Kyung-Soo Kim, Young-Keun Lim, Tae-Gyoon Korea Adv Inst Sci & Technol Dept Mech Engn Taejon 305701 South Korea Handong Global Univ Dept Mech & Control Engn Pohang Gyeongsangbuk D South Korea Res Inst Ind Sci & Technol Pohang Si Gyeongsangbuk D South Korea

ISBN: (纸本)9788993215069

It is important to measure the position of steel coils, especially when automatically transporting them by crane in the relevant industry. To realize a fully automatic coil transporting system, the positions of coils relative to the crane must be measured accurately. This paper introduces a measurement system that can detect positions of the target coil with high robustness and accuracy using 2-D laser sensors. The proposed system can derive the radius, length of a coil, which can be in various sizes, without using any prior informations about the coil. Based on the detected dimensions of the target coil, the sensor system can calculate the positions of coil in real time from a remote distance. The performance of the system is validated through experiments conducted on actual coils, which showed that the precision is within 30mm from a distance range of 5 meters.

关键词： Target tracking robust sensing positioning algorithm 2-D laser scanner

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