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Journal articles on the topic 'Indoor magnetometer calibration. system'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Chow, J. C. K. "STATISTICAL SENSOR FUSION OF A 9-DOF MEMS IMU FOR INDOOR NAVIGATION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W7 (September 12, 2017): 333–38. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w7-333-2017.

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Sensor fusion of a MEMS IMU with a magnetometer is a popular system design, because such 9-DoF (degrees of freedom) systems are capable of achieving drift-free 3D orientation tracking. However, these systems are often vulnerable to ambient magnetic distortions and lack useful position information; in the absence of external position aiding (e.g. satellite/ultra-wideband positioning systems) the dead-reckoned position accuracy from a 9-DoF MEMS IMU deteriorates rapidly due to unmodelled errors. Positioning information is valuable in many satellite-denied geomatics applications (e.g. indoor navi

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Ma, Ming, Qian Song, Yang Gu, and Zhimin Zhou. "Use of Magnetic Field for Mitigating Gyroscope Errors for Indoor Pedestrian Positioning." Sensors 18, no. 8 (2018): 2592. http://dx.doi.org/10.3390/s18082592.

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In the field of indoor pedestrian positioning, the improved Quasi-Static magnetic Field (iQSF) method has been proposed to estimate gyroscope biases in magnetically perturbed environments. However, this method is only effective when a person walks along straight-line paths. For other curved or more complex path patterns, the iQSF method would fail to detect the quasi-static magnetic field. To address this issue, a novel approach is developed for quasi-static magnetic field detection in foot-mounted Inertial Navigation System. The proposed method detects the quasi-static magnetic field using th

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Li, You, Shady Zahran, Yuan Zhuang, et al. "IMU/Magnetometer/Barometer/Mass-Flow Sensor Integrated Indoor Quadrotor UAV Localization with Robust Velocity Updates." Remote Sensing 11, no. 7 (2019): 838. http://dx.doi.org/10.3390/rs11070838.

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Velocity updates have been proven to be important for constraining motion-sensor-based dead-reckoning (DR) solutions in indoor unmanned aerial vehicle (UAV) applications. The forward velocity from a mass flow sensor and the lateral and vertical non-holonomic constraints (NHC) can be utilized for three-dimensional (3D) velocity updates. However, it is observed that (a) the quadrotor UAV may have a vertical velocity trend when it is controlled to move horizontally; (b) the quadrotor may have a pitch angle when moving horizontally; and (c) the mass flow sensor may suffer from sensor errors, espec

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Yang, Wei, Chundi Xiu, Jiarui Ye, et al. "LSS-RM: Using Multi-Mounted Devices to Construct a Lightweight Site-Survey Radio Map for WiFi Positioning." Micromachines 9, no. 9 (2018): 458. http://dx.doi.org/10.3390/mi9090458.

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A WiFi-received signal strength index (RSSI) fingerprinting-based indoor positioning system (WiFi-RSSI IPS) is widely studied due to advantages of low cost and high accuracy, especially in a complex indoor environment where performance of the ranging method is limited. The key drawback that limits the large-scale deployment of WiFi-RSSI IPS is time-consuming offline site surveys. To solve this problem, we developed a method using multi-mounted devices to construct a lightweight site-survey radio map (LSS-RM) for WiFi positioning. A smartphone was mounted on the foot (Phone-F) and another on th

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Muraccini, Marco, Anna Mangia, Maurizio Lannocca, and Angelo Cappello. "Magnetometer Calibration and Field Mapping through Thin Plate Splines." Sensors 19, no. 2 (2019): 280. http://dx.doi.org/10.3390/s19020280.

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While the undisturbed Earth’s magnetic field represents a fundamental information source for orientation purposes, magnetic distortions have been mostly considered as a source of error. However, when distortions are temporally stable and spatially distinctive, they could provide a unique magnetic landscape that can be used in different applications, from indoor localization to sensor fusion algorithms for attitude estimation. The main purpose of this work, therefore, is to present a method to characterize the 3D magnetic vector in every point of the measurement volume. The possibility of descr

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Martins-Filho, Luiz S., and Jader De Amorim. "Experimental Magnetometer Calibration for Nanosatellites’ Navigation System." Journal of Aerospace Technology and Management 8, no. 1 (2016): 103–12. http://dx.doi.org/10.5028/jatm.v8i1.586.

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Koprivica, Branko, Marko Sucurovic, and Alenka Milovanovic. "Calibration of ac induction magnetometer." Facta universitatis - series: Electronics and Energetics 31, no. 4 (2018): 613–26. http://dx.doi.org/10.2298/fuee1804613k.

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The aim of this paper is to describe a procedure and experimental setup for calibration of AC induction magnetometer. The paper presents an overview of the previous research and results of measurement of magnetic flux density inside large diameter multilayer solenoid. This solenoid is magnetising coil of the magnetometer. The paper also describes a system of five smaller coils of the magnetometer which are placed inside the large solenoid. Three small coils are pickup coils, accompanied with two compensation coils, of which one is an empty coil for magnetic field measurement. The experimental

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Nevzorov, A. A., A. A. Orlov, V. K. Ignatjev, and A. A. Bardin. "Calibration algorithm of Hall magnetometer in visible coordinate system." Measurement 134 (February 2019): 939–46. http://dx.doi.org/10.1016/j.measurement.2018.11.065.

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9

Feng, Pan, Danyang Qin, Min Zhao, Ruolin Guo, and Teklu Berhane. "Unsupervised Indoor Positioning System Based on Environmental Signatures." Entropy 21, no. 3 (2019): 327. http://dx.doi.org/10.3390/e21030327.

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Mobile sensors are widely used in indoor positioning in recent years, but most methods require cumbersome calibration for precise positioning results, thus the paper proposes a new unsupervised indoor positioning (UIP) without cumbersome calibration. UIP takes advantage of environment features in indoor environments, as some indoor locations have their signatures. UIP considers these signatures as the landmarks, and combines dead reckoning with them in a simultaneous localization and mapping (SLAM) frame to reduce positioning errors and convergence time. The test results prove that the system

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10

Long, Dafeng, Xiaoming Zhang, Xiaohui Wei, Zhongliang Luo, and Jianzhong Cao. "A Fast Calibration and Compensation Method for Magnetometers in Strap-Down Spinning Projectiles." Sensors 18, no. 12 (2018): 4157. http://dx.doi.org/10.3390/s18124157.

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Attitude measurement is an essential technology in projectile trajectory correction. Magnetometers have been used for projectile attitude measurement systems as they are small in size, lightweight, and low cost. However, magnetometers are seriously disturbed by the artillery magnetic field during launch. Moreover, the error parameters of the magnetometers, which are calibrated in advance, usually change after extended storage. The changed parameters have negative effects on attitude estimation of the projectile. To improve the accuracy of attitude estimation, the magnetometers should be calibr

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Razavi, Hamidreza, Hassan Salarieh, and Aria Alasty. "Optimization-based gravity-assisted calibration and axis alignment of 9-degrees of freedom inertial measurement unit without external equipment." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 2 (2019): 192–207. http://dx.doi.org/10.1177/0954410019861778.

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Applicable in numerous fields, low-cost micro-electromechanical system inertial measurement units often require on-sight calibration by the end user due to the existence of systematic errors. A 9-degrees of freedom inertial measurement unit comprises a tri-axis accelerometer, a tri-axis gyroscope, and a tri-axis magnetometer. Various proposed multi-position calibration methods can calibrate tri-axis accelerometers and magnetometers to a degree. Yet the full calibration of a tri-axis gyroscope and axis alignment of all the sensors still often requires equipment such as a rate table to generate

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Gonsette, Alexandre, Jean Rasson, and François Humbled. "In situ vector calibration of magnetic observatories." Geoscientific Instrumentation, Methods and Data Systems 6, no. 2 (2017): 361–66. http://dx.doi.org/10.5194/gi-6-361-2017.

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Abstract. The goal of magnetic observatories is to measure and provide a vector magnetic field in a geodetic coordinate system. For that purpose, instrument set-up and calibration are crucial. In particular, the scale factor and orientation of a vector magnetometer may affect the magnetic field measurement. Here, we highlight the baseline concept and demonstrate that it is essential for data quality control. We show how the baselines can highlight a possible calibration error. We also provide a calibration method based on high-frequency absolute measurements. This method determines a transform

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Wang, Dongsheng, Yongjie Lu, Lei Zhang, and Guoping Jiang. "Intelligent Positioning for a Commercial Mobile Platform in Seamless Indoor/Outdoor Scenes based on Multi-sensor Fusion." Sensors 19, no. 7 (2019): 1696. http://dx.doi.org/10.3390/s19071696.

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Many traffic occasions such as tunnels, subway stations and underground parking require accurate and continuous positioning. Navigation and timing services offered by the Global Navigation Satellite System (GNSS) is the most popular outdoor positioning method, but its signals are vulnerable to interference, leading to a degraded performance or even unavailability. The combination of magnetometer and Inertial Measurement Unit (IMU) is one of the commonly used indoor positioning methods. Within the proposed mobile platform for positioning in seamless indoor and outdoor scenes, the data of magnet

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Cunion, Ed. "Spherical calibration and quality control of ground and UAV vector magnetometer data." Leading Edge 40, no. 5 (2021): 382a1–382a6. http://dx.doi.org/10.1190/tle40050382a1.1.

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Ground traverse and unmanned aerial vehicle (UAV) airborne magnetic mapping results covering an urban landfill are compared for a picoTesla-resolution fluxgate vector magnetometer (FVM). Rural and urban system noise tests are undertaken first to develop FVM quality assessment and control methods that are then used for processing the landfill survey data. The FVM ground and UAV survey results are subsequently compared with a femtoTesla-resolution alkali-vapor scalar magnetometer ground survey that provides a scalar total magnetic intensity image reference standard.

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Karam, Samer, George Vosselman, Michael Peter, Siavash Hosseinyalamdary, and Ville Lehtola. "Design, Calibration, and Evaluation of a Backpack Indoor Mobile Mapping System." Remote Sensing 11, no. 8 (2019): 905. http://dx.doi.org/10.3390/rs11080905.

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Indoor mobile mapping systems are important for a wide range of applications starting from disaster management to straightforward indoor navigation. This paper presents the design and performance of a low-cost backpack indoor mobile mapping system (ITC-IMMS) that utilizes a combination of laser range-finders (LRFs) to fully recover the 3D building model based on a feature-based simultaneous localization and mapping (SLAM) algorithm. Specifically, we use robust planar features. These are advantageous, because oftentimes the final representation of the indoor environment is wanted in a planar fo

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Sanampudi*, Anusha. "Indore Navigation Mobile Application using Indore Positioning System (IPS)." International Journal of Basic Sciences and Applied Computing 2, no. 10 (2020): 5–7. http://dx.doi.org/10.35940/ijbsac.i0154.0221020.

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Indoor Positioning system (IPS) is the technology that is used to locate smart phones, people or other objects inside a building where Global Positioning System (GPS) doesn’t work or lack precision such as airports, underground locations, parking, multi-storey buildings etc…There is no fixed standard for implementing IPS rather it could be customized according to the location chosen. IPS in turn uses a number of technologies such as Wi-Fi, Bluetooth, Beacons, magnetic positioning, dead reckoning etc…Among the various technologies available studies prove that Magnetic localization provides a mo

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Won, Daehee, Jongsun Ahn, Sangkyung Sung, Moonbeom Heo, Sung-Hyuck Im, and Young Jae Lee. "Performance Improvement of Inertial Navigation System by Using Magnetometer with Vehicle Dynamic Constraints." Journal of Sensors 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/435062.

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A navigation algorithm is proposed to increase the inertial navigation performance of a ground vehicle using magnetic measurements and dynamic constraints. The navigation solutions are estimated based on inertial measurements such as acceleration and angular velocity measurements. To improve the inertial navigation performance, a three-axis magnetometer is used to provide the heading angle, and nonholonomic constraints (NHCs) are introduced to increase the correlation between the velocity and the attitude equation. The NHCs provide a velocity feedback to the attitude, which makes the navigatio

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De-La-Llana-Calvo, Álvaro, José-Luis Lázaro-Galilea, Alfredo Gardel-Vicente, et al. "Weak Calibration of a Visible Light Positioning System Based on a Position-Sensitive Detector: Positioning Error Assessment." Sensors 21, no. 11 (2021): 3924. http://dx.doi.org/10.3390/s21113924.

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Reduced deployment and calibration requirements are key for scalable and cost-effective indoor positioning systems. In this work, we propose a low-complexity, weak calibration procedure for an indoor positioning system based on infrastructure lighting and a positioning-sensitive detector. The proposed calibration relies on genetic algorithms to obtain the relevant system parameters in the real positioning environment without a priori information, and requires a low number of simple measurements. The achievable performance of the proposal was assessed by direct comparison with a formal offline

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19

Zhang, Guiying, Shengjie Huang, and Qiang Lin. "In Situ Calibration of Magnetic Coil System Using Ellipticity-Induced Bell-Bloom Magnetometer." IEEE Photonics Journal 11, no. 1 (2019): 1–9. http://dx.doi.org/10.1109/jphot.2018.2889578.

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20

Wu, Falin, Yuan Liang, Yong Fu, and Chenghao Geng. "A New Indoor Positioning System Using Artificial Encoded Magnetic Fields." Journal of Navigation 71, no. 2 (2017): 299–316. http://dx.doi.org/10.1017/s0373463317000698.

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The demand for accurate indoor positioning continues to grow but the predominant positioning technologies such as Global Navigation Satellite Systems (GNSS) are not suitable for indoor environments due to multipath effects and Non-Line-Of-Sight (NLOS) conditions. This paper presents a new indoor positioning system using artificial encoded magnetic fields, which has good properties for NLOS conditions and fewer multipath effects. The encoded magnetic fields are generated by multiple beacons; each beacon periodically generates unique magnetic field sequences, which consist of a gold code sequenc

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Zhu, Jin Lin, Bing Mo, Chao Dong Ling, and Wen Yuan Fu. "3D Indoor Positioning System Based on MEMS Sensors." Key Engineering Materials 645-646 (May 2015): 498–503. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.498.

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Nowadays, most of scholar study the 2D indoor positioning system based inertial sensors. But in some case, the information of 3D space about person is very important, such as mine accident, fire rescue, and so on. In this paper, we focus on designing and implementing a 3D indoor positioning system based on MEMS sensors and barometer sensor. The MEMS sensors including a three-axis accelerometer, a three-axis gyroscope, and a three-axis magnetometer is used for acquiring information of human movement. Barometer sensor is used to measure the height of the person where he is. Then the collected ra

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Plaschke, Ferdinand, Hans-Ulrich Auster, David Fischer, et al. "Advanced calibration of magnetometers on spin-stabilized spacecraft based on parameter decoupling." Geoscientific Instrumentation, Methods and Data Systems 8, no. 1 (2019): 63–76. http://dx.doi.org/10.5194/gi-8-63-2019.

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Abstract. Magnetometers are key instruments on board spacecraft that probe the plasma environments of planets and other solar system bodies. The linear conversion of raw magnetometer outputs to fully calibrated magnetic field measurements requires the accurate knowledge of 12 calibration parameters: six angles, three gain factors, and three offset values. The in-flight determination of 8 of those 12 parameters is enormously supported if the spacecraft is spin-stabilized, as an incorrect choice of those parameters will lead to systematic spin harmonic disturbances in the calibrated data. We sho

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Kersten, T. P., D. Stallmann, and F. Tschirschwitz. "DEVELOPMENT OF A NEW LOW-COST INDOOR MAPPING SYSTEM – SYSTEM DESIGN, SYSTEM CALIBRATION AND FIRST RESULTS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 15, 2016): 55–62. http://dx.doi.org/10.5194/isprs-archives-xli-b5-55-2016.

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For mapping of building interiors various 2D and 3D indoor surveying systems are available today. These systems essentially differ from each other by price and accuracy as well as by the effort required for fieldwork and post-processing. The Laboratory for Photogrammetry & Laser Scanning of HafenCity University (HCU) Hamburg has developed, as part of an industrial project, a lowcost indoor mapping system, which enables systematic inventory mapping of interior facilities with low staffing requirements and reduced, measurable expenditure of time and effort. The modelling and evaluation of th

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Lin, Chih-Hsuan, Chao-Hung Song та Kuei-Ann Wen. "Integrating Resonator to Enhance Magnetometer Microelectromechanical System Implementation with ASIC Compatible CMOS 0.18 μm Process". Micromachines 12, № 6 (2021): 635. http://dx.doi.org/10.3390/mi12060635.

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In this study, a multi-function microelectromechanical system (MEMS) was integrated with a MEMS oscillator, using the resonant frequency oscillation characteristics of the oscillator to provide the Lorentz current of the magnetometer to enhance a large dynamic range of reading, which eliminates the off-chip clock and current generator. The resonant frequency can be adjusted by adjusting the bias voltage of the oscillator to further adjust the sensitivity of the magnetometer. With the mechanical Q value characteristic, a great dynamic range can be achieved. In addition, using the readout circui

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Li, Supeng, Defu Cheng, Quanming Gao, et al. "An Improved Calibration Method for the Misalignment Error of a Triaxial Magnetometer and Inertial Navigation System in a Three-Component Magnetic Survey System." Applied Sciences 10, no. 19 (2020): 6707. http://dx.doi.org/10.3390/app10196707.

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In order to calibrate the misalignment error of a triaxial magnetometer and an inertial navigation system in a three-component magnetic survey system, an improved method with easy realization is proposed in this paper. We establish the misalignment error model based on Euler’s theorem. We transform the calibration of misalignment error into estimating calibration parameters to minimize the value of objective function. Then, the nonlinear least squares method is used to estimate the calibration parameters. In the simulation experiment, the deviation between the value and the preset value is wit

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Martínez del Horno, Miguel, Ismael García-Varea, and Luis Orozco Barbosa. "Calibration of Wi-Fi-Based Indoor Tracking Systems for Android-Based Smartphones." Remote Sensing 11, no. 9 (2019): 1072. http://dx.doi.org/10.3390/rs11091072.

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With the growing development of smartphones equipped with Wi-Fi technology and the need of inexpensive indoor location systems, many researchers are focusing their efforts on the development of Wi-Fi-based indoor localization methods. However, due to the difficulties in characterizing the Wi-Fi radio signal propagation in such environments, the development of universal indoor localization mechanisms is still an open issue. In this paper, we focus on the calibration of Wi-Fi-based indoor tracking systems to be used by smartphones. The primary goal is to build an accurate and robust Wi-Fi signal

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刘, 春. "Extrinsic Calibration of Multi LiDAR-Camera Robotic System for Indoor Mapping." Geomatics Science and Technology 07, no. 04 (2019): 151–59. http://dx.doi.org/10.12677/gst.2019.74021.

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Chow, J. C. K. "DRIFT-FREE INDOOR NAVIGATION USING SIMULTANEOUS LOCALIZATION AND MAPPING OF THE AMBIENT HETEROGENEOUS MAGNETIC FIELD." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W7 (September 12, 2017): 339–44. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w7-339-2017.

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In the absence of external reference position information (e.g. surveyed targets or Global Navigation Satellite Systems) Simultaneous Localization and Mapping (SLAM) has proven to be an effective method for indoor navigation. The positioning drift can be reduced with regular loop-closures and global relaxation as the backend, thus achieving a good balance between exploration and exploitation. Although vision-based systems like laser scanners are typically deployed for SLAM, these sensors are heavy, energy inefficient, and expensive, making them unattractive for wearables or smartphone applicat

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Opromolla, Roberto. "Magnetometer Calibration for Small Unmanned Aerial Vehicles Using Cooperative Flight Data." Sensors 20, no. 2 (2020): 538. http://dx.doi.org/10.3390/s20020538.

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This paper presents a new method to improve the accuracy in the heading angle estimate provided by low-cost magnetometers on board of small Unmanned Aerial Vehicles (UAVs). This task can be achieved by estimating the systematic error produced by the magnetic fields generated by onboard electric equipment. To this aim, calibration data must be collected in flight when, for instance, the level of thrust provided by the electric engines (and, consequently, the associated magnetic disturbance) is the same as the one occurring during nominal flight operations. The UAV whose magnetometers need to be

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Narita, Yasuhito, Ferdinand Plaschke, Werner Magnes, David Fischer, and Daniel Schmid. "Error estimate for fluxgate magnetometer in-flight calibration on a spinning spacecraft." Geoscientific Instrumentation, Methods and Data Systems 10, no. 1 (2021): 13–24. http://dx.doi.org/10.5194/gi-10-13-2021.

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Abstract. Fluxgate magnetometers are widely used for in situ magnetic field measurements in the context of geophysical and solar system studies. Like in most experimental studies, magnetic field measurements using the fluxgate magnetometers are constrained by the associated uncertainties. To evaluate the performance of magnetometers, the measurement uncertainties of calibrated magnetic field data are quantitatively studied for a spinning spacecraft. The uncertainties are derived analytically by perturbing the calibration parameters and are simplified into the first-order expression including t

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31

Jamali, A., F. Anton, A. Abdul Rahman, and D. Mioc. "A COMPARISON OF ARTIFICIAL NEURAL NETWORK AND HOMOTOPY CONTINUATION IN 3D INTERIOR BUILDING MODELLING." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-4/W7 (October 23, 2017): 13–21. http://dx.doi.org/10.5194/isprs-archives-xlii-4-w7-13-2017.

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Indoor surveying is currently based on laser scanning technology, which is time-consuming and costly. A construction model depends on complex calculations which need to manage a large number of measured points. This is suitable for the detailed geometrical models utilized for representation, yet excessively overstated when a simple model including walls, floors, roofs, entryways, and windows is required, such a basic model being a key for efficient network analysis such as shortest path finding. To reduce the time and cost of the indoor building data acquisition process, the Trimble LaserAce 1

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Gao, Xin, Piotr Mackowiak, Biswajit Mukhopadhyay, Oswin Ehrmann, Klaus Dieter Lang, and Ha Duong Ngo. "Wireless Pressure Sensor System." Applied Mechanics and Materials 530-531 (February 2014): 75–78. http://dx.doi.org/10.4028/www.scientific.net/amm.530-531.75.

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This system consists of a pressure silicon sensor, calibration module and wireless module. The pressure sensor used in this work is a piezoresistive silicon sensor that developed by Technical University Berlin. After calibration of the sensors output signals, the XBee-chip was used for wireless transmission. The three components with peripheral circuits and batteries were integrated in a 50mm × 50mm PCB. The system was then tested in a climate chamber at different temperatures and pressures. Programs for signal receiving and processing were developed in Matlab-environment. The experimental res

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Jalal Abadi, Marzieh, Luca Luceri, Mahbub Hassan, Chun Tung Chou, and Monica Nicoli. "A Cooperative Machine Learning Approach for Pedestrian Navigation in Indoor IoT." Sensors 19, no. 21 (2019): 4609. http://dx.doi.org/10.3390/s19214609.

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This paper presents a system based on pedestrian dead reckoning (PDR) for localization of networked mobile users, which relies only on sensors embedded in the devices and device- to-device connectivity. The user trajectory is reconstructed by measuring step by step the user displacements. Though step length can be estimated rather accurately, heading evaluation is extremely problematic in indoor environments. Magnetometer is typically used, however measurements are strongly perturbed. To improve the location accuracy, this paper proposes a novel cooperative system to estimate the direction of

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Keller, Friedrich, and Harald Sternberg. "Multi-Sensor Platform for Indoor Mobile Mapping: System Calibration and Using a Total Station for Indoor Applications." Remote Sensing 5, no. 11 (2013): 5805–24. http://dx.doi.org/10.3390/rs5115805.

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Kersten, T. P., D. Stallmann, and F. Tschirschwitz. "DEVELOPMENT OF A NEW LOW-COST INDOOR MAPPING SYSTEM – SYSTEM DESIGN, SYSTEM CALIBRATION AND FIRST RESULTS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 15, 2016): 55–62. http://dx.doi.org/10.5194/isprsarchives-xli-b5-55-2016.

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Wen, C., Y. Xia, Y. Lian, et al. "MOBILE LASER SCANNING SYSTEMS FOR GPS/GNSS-DENIED ENVIRONMENT MAPPING." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-1 (September 26, 2018): 457–60. http://dx.doi.org/10.5194/isprs-archives-xlii-1-457-2018.

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<p><strong>Abstract.</strong> Indoor 3D mapping provides a useful three-dimensional structure via an indoor map for many applications. To acquire highly efficient and relatively accurate mapping for large-scale GPS/GNSS-denied scene, we present an upgraded backpacked laser scanning system and a car-mounted indoor mobile laser scanning system. The systems provide both 3D laser scanning point cloud and camera images. In this paper, a simultaneous extrinsic calibration approach for multiple multi-beam LIDAR and multiple cameras is also proposed using the Simultaneous Localizatio

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Oh, Sojung, Jinsoo Shin, Jeongin Kang, and Impyeong Lee. "Calibration of a Rotating Stereo Line Camera System for Indoor Precise Mapping." Korean Journal of Remote Sensing 31, no. 2 (2015): 171–82. http://dx.doi.org/10.7780/kjrs.2015.31.2.11.

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Woźniak, Marek, Waldemar Odziemczyk, and Kamil Nagórski. "INVESTIGATION OF PRACTICAL AND THEORETICAL ACCURACY OF WIRELESS INDOOR POSITIONING SYSTEM UBISENSE." Reports on Geodesy and Geoinformatics 95, no. 1 (2013): 36–48. http://dx.doi.org/10.2478/rgg-2013-0011.

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Abstract This paper presents the accuracy investigation results and functionality of Ubisense RTLS positioning system. Three kinds of studies were conducted: test of calibration accuracy, analysis of theoretical accuracy of the coordinates determination as well as accuracy measurements in field conditions. Test of calibration accuracy was made with several different geometric constellation of reference points (tag positions). We determined changes of orientation parameters of receivers and disturbance of positioning points coordinates against chosen reference points constellations. Analysis of

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Yang, Sui Jun, Jia Ying Song, De Xin Hou, and Shu Liang Ye. "Simulation of Indoor Environment Monitor Calibration Gas Mantle Based on FLUENT." Advanced Materials Research 472-475 (February 2012): 2217–22. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2217.

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The concentration error of standard gas in different locations of calibration system will have different degrees of impact on accuracy of calibration results. Among them, concentration of standard gas in gas mantle that combine detection sensors and gas transmission pipelines show the greatest impact on calibration results. In order to realize monitoring and analysis of the overall calibration process, this paper simulated gas concentration change status during calibration process of indoor environmental monitor gas mantle by FLUENT software. Gas concentration change status and sensor measurem

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Lin, Chih-Hsuan, Chao-Hung Song та Kuei-Ann Wen. "Multi-Function Microelectromechanical Systems Implementation with an ASIC Compatible CMOS 0.18 μm Process". Micromachines 12, № 3 (2021): 314. http://dx.doi.org/10.3390/mi12030314.

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A multi-function microelectromechanical system (MEMS) with a three-axis magnetometer (MAG) and three-axis accelerometer (ACC) function was implemented with an application-specific integrated circuit (ASIC)-compatible complementary metal-oxide-semiconductor (CMOS) 0.18 μm process. The readout circuit used the nested chopper, correlated double-sampling (CDS), noise reduction method; the frequency division multiplexing method; the time-division multiplexing method; and the calibration method. Sensing was performed by exciting the MEMS three-axis magnetometer at X/Y/Z axes mechanical resonant freq

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Wang, Lei, Bo Song, Xueshuai Han, and Yongping Hao. "Attitude Determination Method by Fusing Single Antenna GPS and Low Cost MEMS Sensors Using Intelligent Kalman Filter Algorithm." Mathematical Problems in Engineering 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/4517673.

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For meeting the demands of cost and size for micronavigation system, a combined attitude determination approach with sensor fusion algorithm and intelligent Kalman filter (IKF) on low cost Micro-Electro-Mechanical System (MEMS) gyroscope, accelerometer, and magnetometer and single antenna Global Positioning System (GPS) is proposed. The effective calibration method is performed to compensate the effect of errors in low cost MEMS Inertial Measurement Unit (IMU). The different control strategies fusing the MEMS multisensors are designed. The yaw angle fusing gyroscope, accelerometer, and magneto

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Wang, Yinlong, Jinkui Chu, Ran Zhang, Jinshan Li, Xiaoqing Guo, and Muyin Lin. "A Bio-Inspired Polarization Sensor with High Outdoor Accuracy and Central-Symmetry Calibration Method with Integrating Sphere." Sensors 19, no. 16 (2019): 3448. http://dx.doi.org/10.3390/s19163448.

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A bio-inspired polarization sensor with lenses for navigation was evaluated in this study. Two new calibration methods are introduced, referred to as “central-symmetry calibration” (with an integrating sphere) and “noncontinuous calibration”. A comparison between the indoor calibration results obtained from different calibration methods shows that the two proposed calibration methods are more effective. The central-symmetry calibration method optimized the nonconstant calibration voltage deviations, caused by the off-axis feature of the integrating sphere, to be constant values which can be ca

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Yang, Jin Xian. "Design and Application of Geomagnetic Dynamic Simulator." Key Engineering Materials 467-469 (February 2011): 1200–1205. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.1200.

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A geomagnetic dynamic simulator was designed, and attitude simulation application method was proposed. Three pairs of square Helmholtz coil system was designed, and the geomagnetic field was cancelled by DC current, forming a zero magnetic field space and generating controlled size and direction magnetic field. Three DC current sources were adopted to produce the current for canceling geomagnetic field and the desired magnetic field. The geomagnetic field was offset without three DC power, the premise of saving cost and ensure the accuracy. As the magnetometer accuracy and dynamic capability d

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Huang, Ying, Chong Xi Shi, and Tong Zhen Bo. "The Research of Calibration of the Rainfall in Laboratory Landslide Test." Applied Mechanics and Materials 204-208 (October 2012): 562–70. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.562.

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The laboratory landslide test device of three part constituting by the model slotk and the catchment sink and rainfall system is developed according to test requirements, and it carried out to research calibration test of rainfall and correction of rainfall for rainfall systems under laboratory conditions. The calibration results of rainfall shown that the indoor rainfall increases linearly with time if the opening of the water-tap is reasonably controlled and that can ensure stability of the supplying water of the laboratory landslide test. The correction results of rainfall shown that, accor

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Kiani, Maryam, and Seid H. Pourtakdoust. "Spacecraft Attitude and System Identification Using Marginal Reduced UKF Utilizing the Sun and Calibrated TAM Sensors." Applied Mechanics and Materials 225 (November 2012): 417–22. http://dx.doi.org/10.4028/www.scientific.net/amm.225.417.

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This paper deals with attitude determination, parameter identification and reference sensor calibration simultaneously. A LEO satellite’s attitude, inertia tensor as well as calibration of Three-Axis-Magnetometer (TAM) are estimated during a maneuver designed to satisfy persistency of excitation condition. For this purpose, kinematic and kinetic state equations of spacecraft motion are augmented for the determination of inertia tensor and TAM calibration parameters including scale factors, misalignments and biases along three body axes. Attitude determination is a nonlinear estimation problem.

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López-Pastor, José-Antonio, Antonio-Jesús Ruiz-Ruiz, Antonio-Javier García-Sánchez, and José-Luis Gómez-Tornero. "An Automatized Contextual Marketing System Based on a Wi-Fi Indoor Positioning System." Sensors 21, no. 10 (2021): 3495. http://dx.doi.org/10.3390/s21103495.

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A complete contextual marketing platform including an indoor positioning system (IPS) for smartphones is proposed and evaluated to later be deployed in large infrastructures, such as malls. To this end, we design and implement a novel methodology based on location-as-a-service (LAAS), comprising all the required phases of IPS generation: mall digital map creation, the tools/procedures for offline calibration fingerprint acquisition, the location algorithm, the smartphone app acquiring the fingerprint data, and a validation procedure. To select an appropriate fingerprint location algorithm, a c

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Du, Hao, Wei Wang, Chaowen Xu, Ran Xiao, and Changyin Sun. "Real-Time Onboard 3D State Estimation of an Unmanned Aerial Vehicle in Multi-Environments Using Multi-Sensor Data Fusion." Sensors 20, no. 3 (2020): 919. http://dx.doi.org/10.3390/s20030919.

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The question of how to estimate the state of an unmanned aerial vehicle (UAV) in real time in multi-environments remains a challenge. Although the global navigation satellite system (GNSS) has been widely applied, drones cannot perform position estimation when a GNSS signal is not available or the GNSS is disturbed. In this paper, the problem of state estimation in multi-environments is solved by employing an Extended Kalman Filter (EKF) algorithm to fuse the data from multiple heterogeneous sensors (MHS), including an inertial measurement unit (IMU), a magnetometer, a barometer, a GNSS receiv

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Feng, Sheng, Chengdong Wu, Yunzhou Zhang, and Shigen Shen. "Collaboration calibration and three-dimensional localization in multi-view system." International Journal of Advanced Robotic Systems 15, no. 6 (2018): 172988141881377. http://dx.doi.org/10.1177/1729881418813778.

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In this research, the authors have addressed the collaboration calibration and real-time three-dimensional (3D) localization problem in the multi-view system. The 3D localization method is proposed to fuse the two-dimensional image coordinates from multi-views and provide the 3D space location in real time. It is a fundamental solution to obtain the 3D location of the moving object in the research field of computer vision. Improved common perpendicular centroid algorithm is presented to reduce the side effect of the shadow detection and improve localization accuracy. The collaboration calibrat

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Zhang, Zijian, Xiaojun Cheng, Bilian Yang, and Dong Yang. "Exploration of Indoor Barrier-Free Plane Intelligent Lofting System Combining BIM and Multi-Sensors." Remote Sensing 12, no. 20 (2020): 3306. http://dx.doi.org/10.3390/rs12203306.

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Lofting is an essential part of construction projects and the high quality of lofting is the basis of efficient construction. However, the most common method of lofting currently which uses the total station in a multi-person cooperative way consumes much manpower and time. With the rapid development of remote sensing and robot technology, using robots instead of manpower can effectively solve this problem, but few scholars study this. How to effectively combine remote sensing and robots with lofting is a challenging problem. In this paper, we propose an intelligent lofting system for indoor b

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Landau, Yael, and Boaz Ben-Moshe. "STEPS: An Indoor Navigation Framework for Mobile Devices." Sensors 20, no. 14 (2020): 3929. http://dx.doi.org/10.3390/s20143929.

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This paper presents a vision-based navigation system designed for indoor localization. The suggested framework works as a standalone 3 D positioning system by fusing a sophisticated optical-flow pedometry with map constrains using an advanced particle filter. The presented method requires no personal calibration and works on standard smartphones with relatively low energy consumption. Field experiments on Android smartphones show that the expected 3 D error is about 1–2 m in most real-life scenarios.

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