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Uniform gradient magnetic field and spatial localization method based on Maxwell coils for virtual surgery simulation

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COMPUTER ANIMATION AND VIRTUAL WORLDS 2024年第3期35卷

作者： Huang, Yi Deng, Xutian Zhao, Xujie Xie, Wenxuan Yuan, Zhiyong Zhao, Jianhui Wuhan Univ Sch Comp Sci Wuhan 430072 Hubei Peoples R China Tech Univ Munich Sch Computat Informat & Technol Munich Germany Chinese Univ Hong Kong Sch Mech & Automat Engn Hong Kong Peoples R China

With the development of virtual reality technology, simulation surgery has become a low-risk surgical training method and high-precision positioning of surgical instruments is required in virtual simulation surgery. In this paper we design and validate a novel electromagnetic positioning method based on a uniform gradient magnetic field. We employ Maxwell coils to generate the uniform gradient magnetic field and propose two positioning algorithms based on magnetic field, namely the linear equation positioning algorithm and the magnetic field fingerprint positioning algorithm. After validating the feasibility of proposed positioning system through simulation, we construct a prototype system and conduct practical experiments. The experimental results demonstrate that the positioning system exhibits excellent accuracy and speed in both simulation and real-world applications. The positioning accuracy remains consistent and high, showing no significant variation with changes in the positions of surgical instruments. A pair of Maxwell coils generate a uniform gradient magnetic field. The magnetic sensor is fixed on the surgical instrument, and the magnetic induction intensity component received by the sensor is combined with the proposed positioning algorithm to achieve real-time positioning of the surgical instrument and display it in the simulation environment. image

关键词： electromagnetic localization Maxwell coils positioning algorithm surgery simulation uniform gradient magnetic field virtual reality

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Lateral positioning of vibration source for underground pipeline monitoring based on ultra-weak fiber Bragg grating sensing array

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MEASUREMENT 2021年 172卷 108892-108892页

作者： Jiang, Jinpeng Liu, Fang Wang, Honghai Li, Sheng Gan, Weibing Jiang, Ru Wuhan Univ Technol Natl Engn Lab Fiber Opt Sensing Technol Wuhan 430070 Peoples R China Wuhan Univ Technol Sch Informat Engn Wuhan 430070 Peoples R China

Monitoring the underground pipeline to prevent the illegal intrusion is a quite important work for civil infrastructure security management. The distributed fiber optic sensing technology nowadays has been widely used in the monitoring. Meanwhile, it also suffers from a relatively high false alarm rate. To tackle the difficult problem of false alarms, the paper develops a short range lateral positioning method of vibration source based on ultra-weak fiber Bragg grating vibration sensing array. Two parallel fiber optic cables are required to be deployed at the both sides of the pipeline. The positioning algorithm establishes a least square misfit function between the predicted and observed travel time difference based on the double-cable data. By systematically searching through the possible lateral distance in a selected range, an optimal distance can be identified according to the minimal misfit value. The tests on synthetic and field data validate the effectiveness of the proposed method.

关键词： Pipeline monitoring Source lateral positioning Fiber optic cable Ultra-weak fiber Bragg grating positioning algorithm

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UWB-Based Indoor Localization: How to Optimally Design the Operating Setup?

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2022年 71卷 1页

作者： Cerro, Gianni Ferrigno, Luigi Laracca, Marco Miele, Gianfranco Milano, Filippo Pingerna, Valentina Univ Molise Dept Med & Hlth Sci Vincenzo Tiberio I-86100 Campobasso Italy Univ Cassino & Southern Lazio Dept Elect & Informat Engn I-03043 Cassino Italy Sapienza Univ Rome Dept Astronaut Elect & Energy Engn I-00185 Rome Italy

Localizing objects in indoor environments with anchor-based systems poses several challenges to be faced. The main one is the design phase. What is the minimum number of anchors to be adopted? What is the optimal placement of the anchors in the operating domain? These are typical issues that need to be solved in this stage. Such issue is generally addressed by several experimental tests, imposing high costs both in the required large amounts of time and in the use of devices. In addition, sometimes the experiments will not warrant to identify the optimal design solution. In this work, a black-box design tool is proposed, able to manage different environments, in terms of domain size, maximum number of available anchors, device metrological features, and target performance. Such an approach, to be effective, needs a preliminary validation versus experimental results to make the future performance predictions reliable and avoid unexpected localization accuracy degradation. For this reason, the presented work adopts a side-by-side development, by evaluating results' compatibility, in static and dynamic contexts, before addressing further and more complex analyses relying on the design tool only. Such a comparison proves the goodness of the developed design tool, and the outcomes allow an accurate localization system design by finding anchors' placement solutions with the minimum computational burden.

关键词： Location awareness Design tools Performance evaluation Optimization Computational modeling Uncertainty Extraterrestrial measurements Design tools indoor localization optimization positioning algorithm ultrawideband (UWB) technology

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Localization algorithm of wireless sensor network based on matrix reconstruction

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COMPUTER COMMUNICATIONS 2020年第0期154卷 216-222页

作者： Wang, Ping Tu, Gang Fuzhou Univ Int Studies & Trade Fuzhou 350202 Fujian Peoples R China Jiangsu Vocat Coll Finance & Econ Fac Mech Elect & Informat Engn Huaian 223003 Jiangsu Peoples R China

In view of the situation that the sensor network is applied to the complex environment, the connectivity is low, the ranging information is limited, and the ranging data has noise, this paper propose the positioning algorithm based on the addition of the generalized Lagrange matrix. Based on the low-rank characteristics of the distance matrix between the nodes of the sensor network, the distance recovery problem under partial sampling information is modeled as the matrix completion problem under Gaussian noise. The unmeasured distance information can be inferred through matrix filling and the noise and anomaly caused by the external environment can be filtered at the same time, which reduces the influence of environmental noise on the positioning and improves the positioning stability and accuracy.

关键词： Wireless sensor network positioning algorithm Extended Lagrangian matrix Matrix recover

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The Study and Realization of Satellite positioning algorithm in No Light

The Study and Realization of Satellite Positioning Algorithm...

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3rd International Conference on Photonics and Image in Agriculture Engineering (PIAGENG)

作者： Li, Jizhong Liu, Jinmei Qingdao Agr Univ Sci & Informat Coll Qingdao 266109 Peoples R China

ISBN: (纸本)9780819495594

In order to position, the algorithms of three satellites and two is designed when the equation groups constituted by received satellite signals can't be solved by traditional algorithm in no light of sky. The equation groups are constituted by received signal equations and earth ellipsoid equation. The equation groups are linearized with first-order Taylor series, and the location result was solved by Gauss-Newton iterative algorithm. The measurement results based on this new algorithm were analyzed in this paper and it perfectly shows that the three satellites positioning is a good supplement to the conventional location, and the Two Satellites positioning is a useful reference when there are no enough satellites that can be received.

关键词： Navigation Principle positioning algorithm Linearization Gauss-Newton method

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Mountain Mapping Relaying Communication positioning algorithm

Mountain Mapping Relaying Communication Positioning Algorith...

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2nd International Conference on Measurement, Instrumentation and Automation (ICMIA 2013)

作者： Zhu Shengjie Feng Xinhuan Wuhan Univ Sch Resources & Environm Sci Wuhan 430072 Peoples R China Wuhan Univ Sch Comp Wuhan 430072 Peoples R China

ISBN: (纸本)9783037857519

Naturally, for the mountain mapping, the communication system's power is limited, As a matter of fact, the stations should be built as high as possible in order to eliminate the terrain shielding and radiate to the farther areas, however the number of users or other aspects also counts, In this paper, we introduced new methods to locate the modified location for the base stations in the mountain areas, and with this method, we use less stations to cover the most areas in the given situation. For a random mountain terrain, the coverage rate of this model is as high as 95.1%.

关键词： Mountain Mapping Field Communication positioning algorithm Mapping equipment

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Research on the Visualization of Electromagnetic Environment in Nuclear Power Plants

International Core Journal of Engineering

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International Core Journal of Engineering 2022年第10期8卷 221-229页

作者： Yu Wang

The equipment and cables of the various plants of Nuclear Power Plant are complex, which greatly improves the possibility of electrical equipment being subjected to electromagnetic interference, and electromagnetic interference is mainly reflected in the interference of digital, pointer-type instrumented systems and automatic control systems, resulting in false alarms and electromagnetic compatibility failures. In order to solve such faults, the project team conducted field tests in and developed a set of electromagnetic environment visualization system based on image recognition algorithm, including image recognition, image processing, electromagnetic signal monitoring, etc., to visually display the electromagnetic environment in key areas of the plant and sort out a complete test and monitoring process.

关键词： Electromagnetic Environment positioning algorithm Electromagnetic Data Analysis

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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 Smart UAV-Femtocell Data Sensing System for Post-Earthquake Localization of People

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IEEE ACCESS 2020年 8卷 30262-30270页

作者： Avanzato, Roberta Beritelli, Francesco Univ Catania Dept Elect Elect & Comp Engn I-95125 Catania Italy

The paper proposes an intelligent data sensing and geo-localization algorithm, based on an innovative mobile computing system that measures the power level of RF sources through a 2G/5G femtocell-UAV system. In natural disasters (mainly earthquakes and floods) the system can identify any missing persons under the rubble within a range of precision between 1 to 2 meters. In this paper, more specifically, the algorithm allows classifying the terminal even in the presence of obstacles that cause anisotropic propagation of radio signals, through a series of power measurements based on the Reference Signal Received Power (RSRP). An attenuation model that takes into account the different types of materials is introduced, and a method for optimizing the drone's flight path and duration is proposed. The performances, expressed in terms of accuracy in identifying the mobile terminal and in terms of position estimation average error, are evaluated according to the material's density and its attenuation.

关键词： Femtocell UAV system geo-localization technique 2G 5G radio technologies reference signal received power (RSRP) mobile terminal classification positioning algorithm energy consumption

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A Study on the Application of WSN positioning Technology to Unattended Areas

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IEEE ACCESS 2019年 7卷 38085-38099页

作者： Lv, Yanhui Liu, Yong Hua, Jiangfeng Shenyang Ligong Univ Coll Informat Sci & Engn Shenyang 110159 Liaoning Peoples R China

Wireless sensor network (WSN) is a kind of self-organized network that plays a critical role in the rescue and relief work of some unattended areas in recent years. With the application background of unattended areas, a positioning algorithm with high accuracy and coverage in the WSN is presented in this paper. First, in view of the complicated environment in unattended areas and demand for accurate positioning, this paper focuses on the ranging-based positioning technology, introduces double-hop ranging in the Euclidean algorithm into the 3D ranging process at the node, and proposes 3DL positioning algorithm on this basis. This proposed algorithm is able to achieve 3D positioning of network nodes and effectively enlarge the network positioning coverage by upgrading the positioned node with adequate accuracy to proxy anchor. Second, since unattended areas are mostly non-line-of-sight (NLOS) environments and node positioning accuracy is affected by NOLS factors, a 3DL-N positioning algorithm is proposed by introducing the way of making up for node positioning error based on the 3DL algorithm. The algorithm makes use of the relative positioning function of anchors to figure out the ranging correction parameter and node positioning error compensation value and adds it to the positioning process of the common to further improve its positioning accuracy. Finally, the simulation results indicate that the positioning algorithm proposed in this paper enjoys significant strengths in terms of positioning accuracy and coverage on the premise of consuming no higher node energy.

关键词： positioning accuracy positioning algorithm wireless sensor network (WSN)

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