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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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Efficient readout electronics for multianode photomultiplier

Efficient readout electronics for multianode photomultiplier

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Conference on Hard X-Ray, Gamma-Ray and Neutron Detector Physics XII

作者： Lerche, Christoph W. Herrero-Bosch, Vicente Ferrando-Jodar, Nestor Gadea-Girones, Rafa Sanchez-Martinez, Filomeno Mora-Masa, Francisco J. Univ Politecn Valencia Inst Instrumentacin Imagen Mol E-46071 Valencia Spain Inst Fs Corpuscular Valencia Spain

ISBN: (纸本)9780819483010

We present a novel active and analog readout and preprocessing topology for position sensitive photodetectors (PSPD) that allows to readout a large variety of PSPD devices with different pixel numbers. Additionally, the topology was designed to allow for a significant reduction of analog-to-digital conversion channels. The circuit topology replaces the common passive charge divider and consists of N input stages, N x M weighting stages and M analog adder stages, where N is the number of the input channels, i.e. the number of photodetector pixels and M is the number of outputs. The circuit performs the multiplication of a matrix (the weights) with a vector (signals). For this, the input stage makes M copies of each of the N input signals, the weighting stage multiplies these signal copies with N x M different weights and the output stage adds all weighted copies with the same copy index. For high flexibility, the weights are programmable and the topology allows to interconnect several identical circuits for larger N. Measurements with a first prototype ASIC show that the achieved energy and centroid resolutions equal the resolutions from detectors with passive charge division circuits. However, the presented topology presents important advantages such as scalability. As a first application, we used the prototype ASIC to correct the sensitivity inhomogeneity of position sensitive photomultiplier tubes. As a second application for the circuit, we present a Neural Network based positioning scheme for gamma-ray imaging detectors with thick, monolithic scintillation crystals. This allows to correct the strong border artifacts of the center of gravity positioning scheme in monolithic scintillation crystals and thus enhances the spatial resolution of the gamma-ray imaging detector.

关键词： positioning algorithm Gamma-Ray Imaging Neural Network positioning

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A MLAT algorithm Based on Target Pressure Altitude 12

A MLAT Algorithm Based on Target Pressure Altitude

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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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DOI-enhanced gamma-ray position detection for a small animal PET camera

DOI-enhanced gamma-ray position detection for a small animal...

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Nuclear Science Symposium/Medical Imaging Conference

作者： Lerche, Ch. W. Ros, A. Abellan, D. Palazon, J. A. Sanchez, F. Martinez, J. Sebastia, A. Benlloch, J. M. Univ Valencia CSIC Inst Fis Corpuscular Valencia Spain

ISBN: (纸本)0780392213

We studied the possibility of correcting edge artifacts caused by the Center of Gravity positioning algorithm (COG) within thick continuous scintillation crystals for gamma-ray imaging detectors. An enhanced charge division readout (CDR) together with multi-channel position sensitive photo-multiplier tubes allows the measurement of the 2(nd) moment of the scintillation light distribution within continuous and large-sized crystals. Using the 2(nd) moment together with the centroids provided by the CDR, the standard deviation sigma of the light distribution can be computed, providing a good estimator for the depth of interaction (DOI). We measured the sigma resolution at 81 positions of a test-detector's sensitive area and found an average resolution of 6 +/- 4.0mm. At the central region of 20 x 20mm(2) the performance of our method was with 3 +/- 0.8mm sigma resolution much better. The lowest observed value was 1.8mm. The 0(th), 1(X)(st), 1(Y)(st) and 2(nd) moments of the light distribution were also measured for the 81 positions and compared to predictions obtained by a model for the light distribution. Analytic studies show that the use of the first low order moments probably allows significant reduction of the DOI-caused border artifacts of the COG algorithm.

关键词： DOI PET positioning algorithm gamma ray imaging continuous scintillators

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An Improved Long-Period Precise Time-Relative positioning Method Based on RTS Data

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SENSORS 2021年第1期21卷 53-53页

作者： Lu, Yangwei Ji, Shengyue Tu, Rui Weng, Duojie Lu, Xiaochun Chen, Wu Chinese Acad Sci Natl Time Serv Ctr Shu Yuan Rd Xian 710600 Peoples R China China Univ Petr East China Dept Surveying & Mapping Qingdao 266580 Peoples R China Hong Kong Polytech Univ Shenzhen Res Inst Shenzhen 518057 Peoples R China Hong Kong Polytech Univ Dept Land Surveying & Geoinformat Hong Kong 999077 Peoples R China

The high precision positioning can be easily achieved by using real-time kinematic (RTK) and precise point positioning (PPP) or their augmented techniques, such as network RTK (NRTK) and PPP-RTK, even if they also have their own shortfalls. A reference station and datalink are required for RTK or NRTK. Though the PPP technique can provide high accuracy position data, it needs an initialisation time of 10-30 min. The time-relative positioning method estimates the difference between positions at two epochs by means of a single receiver, which can overcome these issues within short period to some degree. The positioning error significantly increases for long-period precise positioning as consequence of the variation of various errors in GNSS (Global Navigation Satellite System) measurements over time. Furthermore, the accuracy of traditional time-relative positioning is very sensitive to the initial positioning error. In order to overcome these issues, an improved time-relative positioning algorithm is proposed in this paper. The improved time-relative positioning method employs PPP model to estimate the parameters of current epoch including position vector, float ionosphere-free (IF) ambiguities, so that these estimated float IF ambiguities are used as a constraint of the base epoch. Thus, the position of the base epoch can be estimated by means of a robust Kalman filter, so that the position of the current epoch with reference to the base epoch can be obtained by differencing the position vectors between the base epoch and the current one. The numerical results obtained during static and dynamic tests show that the proposed positioning algorithm can achieve a positioning accuracy of a few centimetres in one hour. As expected, the positioning accuracy is highly improved by combining GPS, BeiDou and Galileo as a consequence of a higher amount of used satellites and a more uniform geometrical distribution of the satellites themselves. Furthermore, the positioning accura

关键词： GNSS satellite receivers positioning error positioning algorithm

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A Multiple Target positioning and Tracking System Behind Brick-Concrete Walls Using Multiple Monostatic IR-UWB Radars

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SENSORS 2019年第18期19卷 4033-4033页

作者： Yoo, Sungwon Wang, Dingyang Seol, Dong-Min Lee, Chulsoo Chung, Sungmoon Cho, Sung Ho Hanyang Univ Dept Elect & Comp Engn Seoul 04763 South Korea LIGNex1 Co Ltd Data Link & Positioning Syst Seongnam 13488 South Korea Agcy Def Dev Def Ind Technol Ctr Seoul 04353 South Korea

Recognizing and tracking the targets located behind walls through impulse radio ultra-wideband (IR-UWB) radar provides a significant advantage, as the characteristics of the IR-UWB radar signal enable it to penetrate obstacles. In this study, we design a through-wall radar system to estimate and track multiple targets behind a wall. The radar signal received through the wall experiences distortion, such as attenuation and delay, and the characteristics of the wall are estimated to compensate the distance error. In addition, unlike general cases, it is difficult to maintain a high detection rate and low false alarm rate in this through-wall radar application due to the attenuation and distortion caused by the wall. In particular, the generally used delay-and-sum algorithm is significantly affected by the motion of targets and distortion caused by the wall, rendering it difficult to obtain a good performance. Thus, we propose a novel method, which calculates the likelihood that a target exists in a certain location through a detection process. Unlike the delay-and-sum algorithm, this method does not use the radar signal directly. Simulations and experiments are conducted in different cases to show the validity of our through-wall radar system. The results obtained by using the proposed algorithm as well as delay-and-sum and trilateration are compared in terms of the detection rate, false alarm rate, and positioning error.

关键词： impulse radio ultra-wideband radar through-wall radar imaging multiple target positioning and tracking wall characteristic estimation constant false alarm rate positioning algorithm

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Identification of Mobile Terminal with Femtocell on Drone for Civil Protection Applications 10

Identification of Mobile Terminal with Femtocell on Drone fo...

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10th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems - Technology and Applications (IDAACS)

作者： Avanzato, Roberta Beritelli, Francesco Vaccaro, Mario Univ Catania Dept Elect Elect & Comp Engn Catania Italy

ISBN: (纸本)9781728140698

In the last few years the interest in advanced methods for the identification of people missing in natural disaster scenarios has increased. The paper offers an innovative technique for the identification of a mobile terminal under the rubble by means of a series of measurements carried out by a femtocell positioned on a four-rotor UAV (Unmanned Aerial Vehicle), commonly named drone. This technique uses the Reference Signal Received Power (RSRP) from the terminals under the rubble. The first tests show that the results are satisfactory, obtaining an error on the estimate of the position on average of about 2 meters.

关键词： Drone Femtocell Reference Signal Received Power positioning algorithm 4G technologies (LTE)

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Energy characterization of attitude algorithms 17

Energy characterization of attitude algorithms

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17th IEEE International Conference on Industrial Informatics (INDIN)

作者： Carratu, Marco Dello Iacono, Salvatore Hoang, Minh Long Pietrosanto, Antonio Univ Salerno Dept Ind Engn Fisciano SA Italy

ISBN: (纸本)9781728129273

The aim of this paper is to presents a comparison among three different algorithms of sensor data fusion based on Inertial Measurement Unit (IMU) looking at how they influence the energy consumption in an IMU platform. Complementary filter, Kalman filter and Quaternion filter have been considered for the aim using a low-cost platform equipped with Micro-Electro-Mechanical-system (MEMS) as gyroscope, accelerometer and magnetometer. The energy consumptions have been measured during both static and dynamic operations, using the industry-standard CoreMark performance benchmark with the ULPMark line of ultra-low-power benchmarks, reporting the difference among the considered algorithms.

关键词： MEMS IMU Energy consumption ULPMark positioning algorithm Low power

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The Research of Multipath and Linear Error for Pseudolites Applications

The Research of Multipath and Linear Error for Pseudolites A...

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3rd International Conference on Mechanical and Electronics Engineering (ICMEE 2011)

作者： Wan, Xiaoguang Zhan, Xingqun Shanghai Jiao Tong Univ Sch Aeronaut & Astronaut Shanghai Peoples R China

ISBN: (纸本)9783037852866

Pseudolites are ground-based transmitters that send global navigation satellite system like signals, such as GPS, GLONASS, or Galileo. As an independent system for indoor positioning, pseudolites technique can be explored for a wide range of positioning and navigation application where the signal of satellite GNSS can't be received. However, with indoor environment, the positioning method of pseudolite navigation system is not entirely same as GNSS, and there are some challenging issues in research and system design. In this paper, a signal difference carrier phase measurement system with pseudolites is design. Furthermore, two major problems are studied that they are multipath error and linear errors.

关键词： Pseudolite Multipath Linear error positioning algorithm

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