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Articoli di riviste sul tema "Global positon system"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 1 febbraio 2022

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1

Ito, Shinpei, Akinori Takahashi, Ruochen Si e Masatoshi Arikawa. "Visual-Inertial Odometer-Based Global High Precision Indoor Human Navigation in a University Library". Abstracts of the ICA 1 (15 luglio 2019): 1–2. http://dx.doi.org/10.5194/ica-abs-1-142-2019.

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<p><strong>Abstract.</strong> AR (Augmented Reality) could be realized as a basic and high-level function on latest smartphones with a reasonable price. AR enables users to experience consistent three-dimensional (3D) spaces co-existing with 3D real and virtual objects with sensing real 3D environments and reconstructing them in the virtual world through a camera. The accuracy of sensing real 3D environments using an AR function, that is, visual-inertial odometer, of a smartphone is extremely higher than one of a GPS receiver on it, and can be less than one centimeter. However, current common AR applications generally focus on “small” real 3D spaces, not large real 3D spaces. In other words, most of the current AR applications are not designed for uses based on a geographic coordinate system.</p><p>We proposed a global extension of the visual-inertial odometer with an image recognition function of geo-referenced image markers installed in real 3D spaces. Examples of geo-referenced image markers can be generated from analog guide boards existing in the real world. We tested this framework of a global extension of the visual-inertial odometer embedded in a smartphone on the first floor in the central library of Akita University. The geo-referenced image markers such as floor map boards and book categories sign boards were registered in a database of 3D geo-referenced real-world scene images. Our prototype system developed on a smartphone, that is, iPhone XS, Apple Inc., could first recognized a floor map board (Fig. 1), and could determine the 3D precise distance and direction of the smartphone from the central position of the floor map board in a local 3D coordinate space with the origin point as the central positon of the board. Then, the system could convert the relative precise position and the relative direction of the smartphone’s camera in a local coordinate space into a global precise location and orientation of it. A subject was walking the first floor in the building of the library with a world tracking function of the smartphone. The experimental result shows that the error of tracking a real 3D space of a global coordinate system was accumulated, but not bad. The accumulated error was only about 30 centimeters after the subject’s walking about 30 meters (Fig. 2). We are now planning to improve our prototype system in the accuracy of indoor navigation with calibrating the location and orientation of a smartphone based sequential recognitions of multiple referenced scene image markers which have already existed for a general user services of the library before developing this proposed new services. As the conclusion, the experiment’s result of testing our prototype system was impressive, we are now preparing a more practical high-precision LBS which enables a user to be navigated to the exact location of a book of a user’s interest in a bookshelf on a floor with AR and floor map interfaces.</p>
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Sasaki, Kimiaki. "Position-Detecting System Based on the Global Positioning System". Transportation Research Record: Journal of the Transportation Research Board 1916, n. 1 (gennaio 2005): 30–33. http://dx.doi.org/10.1177/0361198105191600105.

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The Railway Technical Research Institute has developed a position detection system based on a new Global Positioning System (GPS). This system uses GPS to detect the approximate location of a train and then selects one of three algorithms to process the location data and determine the train's precise location. Running tests performed on the system showed that its position error was less than 4 m. This system has the potential to be used to control the car body tilting of tilt trains accurately and allow them to run at the maximum possible speed through the tight curves typical of the narrow-gage lines found in Japan. In addition, the automatic map created by this system makes it much easier to maintain the accuracy of the onboard database.
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., Haniah, e Agfianto Eko Putra. "Purwarupa Portable Global Positioning System". IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) 3, n. 1 (30 aprile 2015): 105. http://dx.doi.org/10.22146/ijeis.3876.

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AbstrakTelah dibuat sebuah sistem GPS portable menggunakan receiver GPS serta tampilan LCD 128X64. Sistem ini dapat membantu pengguna untuk mengetahui posisi mereka berada agar tidak tersesat. Sistem ini menampilkan data latitude, longitude, kecepatan dan waktu yang ditampilkan pada LCD 128X64. Sehingga pengguna bisa mengetahui posisi mereka dengan melihat posisi garis lintang dan garis bujur. Sistem ini dibuat dengan menggunakan mikrokontroler ATmega32 sebagai pemroses, GPS receiver Polstar PMB-688 untuk menerima data posisi dari satelit dan LCD 128X64 sebagai penampil. Sistem yang dibuat telah mampu menampilkan posisi garis lintang, garis bujur dan kecepatan secara akurat. Deviasi rata-rata untuk GPS portabel dibanding dengan GPS garmin adalah 1,753449 m ± 0,113532 m sedangkan deviasi rata-rata untuk kecepatan adalah 0,441 km/j ± 0,247 km/j. Kata kunci— GPS, Posisi, Polstar PMB-688, Atmega32, Mikrokontroler. Abstract Has created a portable GPS system uses a GPS receiver as well as an LCD display 128X64. This system can help users to identify where they are located so as not to get lost. This system displays the latitude, longitude, speed and time are displayed on the LCD 128X64. So users can know their position by looking at the position of latitude and longitude. This system using microcontroller ATmega32 as processor, GPS receiver Polstar PMB-688 to receive position data from satellites and LCD 128X64 as a viewer. The system is already capable of showing the position of the latitude, longitude and speed accurately. Average deviation for GPS portable than static point is 1.753449 m ± 0.113532 m while the average deviation for speed is 0.441000 kmh ± 0.247000 kmh. Keywords— GPS, Position, Polstar PMB-688, Atmega32, Mikrocontroller.
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Singal, Pooja, e R. S. Chhillar R.S.Chhillar. "Dijkstra Shortest Path Algorithm using Global Position System". International Journal of Computer Applications 101, n. 6 (18 settembre 2014): 12–18. http://dx.doi.org/10.5120/17690-8654.

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Tymchenko, B. I. "GLOBAL POSITION SYSTEM SENSOR MODEL FOR ROBOTICS SIMULATOR". Odes’kyi Politechnichnyi Universytet Pratsi, n. 3(53) (2017): 88–93. http://dx.doi.org/10.15276/opu.3.53.2017.12.

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Jain, Apoorva. "Rectangular Microstrip Patch Antenna for Global Position System". International Journal of Engineering Trends and Technology 37, n. 1 (25 luglio 2016): 28–32. http://dx.doi.org/10.14445/22315381/ijett-v37p207.

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Mandic, Stefan. "Position of Serbia in the global capitalist system". Kultura, n. 148 (2015): 80–101. http://dx.doi.org/10.5937/kultura1548080m.

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Xu, Liang, Jingjun Guo e Jianjing Jiang. "Health monitoring of suspension bridges by global position system". IABSE Symposium Report 84, n. 5 (1 gennaio 2001): 8–15. http://dx.doi.org/10.2749/222137801796350455.

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Chase-Dunn, Christopher. "Guatemala in the Global System". Journal of Interamerican Studies and World Affairs 42, n. 4 (2000): 109–26. http://dx.doi.org/10.2307/166344.

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This article presents a short summary of the world-systems perspective on globalization as relevant to considering the possibilities and probabilities of Guatemala’s prospects for democracy and development. Guatemala’s structural position in the larger global political economy is examined. The strategy of “globalization from below” as popular movement alliances’ response to neoliberal corporate globalization is considered in the Guatemalan context.
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Akbar, Z., Z. B. Hasanuddin e A. E. U. Salam. "Automatic buoy system for position control based on global positioning system (GPS)". IOP Conference Series: Materials Science and Engineering 885 (6 agosto 2020): 012024. http://dx.doi.org/10.1088/1757-899x/885/1/012024.

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Kuang, Xing Hong, Zhe Yi Yao e Shi Ming Wang. "A Design of Position Terminal Based on BDS". Applied Mechanics and Materials 635-637 (settembre 2014): 1128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.1128.

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With the development of economy, the global satellite navigation system with its high speed, high efficiency, high precision measurement and positioning a series of significant advantages, favored by various industry data collection and monitoring of personnel resources , the advent of satellite navigation systems to solve a large-scale, rapid and high-precision global positioning problem. Its scope of application has penetrated to the various departments of the national economic and social development in various fields and industries. To be able to monitor the progressive realization of automated data collection and transmission, the urgent need to adopt advanced positioning technology to build real-time location monitoring system PC Based Development Background navigation receiver , an overview of the inter Beidou BD-126 systems and microcontrollers can be serially the basic principle of mouth communication describes the communication protocol Compass BD-126 positioning module and the next crew between the microcontroller to control development in the use of PC positioning system for a detailed description , including the BDS Beidou satellite navigation module and microcontroller serial data communications, microprocessor controlled real-time data display , and so on
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de Francisco Ortiz, Óscar, Irene Ortiz e Antonio Bueno. "New Global Referencing Approach in a Camera-LCD Micro Positioning System". Sensors 20, n. 7 (9 aprile 2020): 2118. http://dx.doi.org/10.3390/s20072118.

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In any precision manufacturing process, positioning systems play a very important role in achieving a quality product. As a new approach to current systems, camera-LCD positioning systems are a new technology that can provide substantial improvements enabling better accuracy and repeatability. However, in order to provide stability to the system a global positioning system is required. This paper presents an improvement of a positioning system based on the treatment of images on an LCD in which a new algorithm with absolute reference has been implemented. The method is based on basic geometry and linear algebra applied to computer vision. The algorithm determines the spiral center using an image taken at any point. Consequently, the system constantly knows its position and does not lose its reference. Several modifications of the algorithm are proposed and compared. The simulation and test of the algorithm provide an important improvement in the reliability and stability of the positioning system providing errors of microns for the calculation of the global position used by the algorithm.
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Lee, Seungwoo, Bob E. Schutz e P. A. M. Abusali. "Hybrid Precise Orbit Determination Strategy by Global Position System Tracking". Journal of Spacecraft and Rockets 41, n. 6 (novembre 2004): 997–1009. http://dx.doi.org/10.2514/1.1113.

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Bartha, Ferenc A., e Tibor Krisztin. "Global stability in a system using echo for position control". Electronic Journal of Qualitative Theory of Differential Equations, n. 40 (2018): 1–16. http://dx.doi.org/10.14232/ejqtde.2018.1.40.

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Jovićević, Mladen, e Željko Janjetović. "Position of the European Union in the Global Trade System". ECONOMICS 5, n. 2 (20 dicembre 2017): 19–32. http://dx.doi.org/10.1515/eoik-2017-0021.

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Summary Only a few decades ago, the main drivers of globalization were the exchange of goods and capital flows, while the global trading system of today, fuelled by rapid technological changes increasingly bases itself on knowledge. The Key events - such as the use of the Internet and the increasingly important role of the rising countries economies - have contributed to a faster global exchange, but to a new nature as well. In order to illustrate the scope of the increase, perhaps it would be the best to mention the fact that in the 1970’s the share of trade in the world GDP amounted to 20%, whereas today it makes about one half. On the other hand, modern products represent compounds of raw materials, components, technologies and services originating from different areas and different continents, which has globalized the products themselves. In such conditions of the market competition, imposed by globalization and liberalization, for the European Union to remain as a leader, it had to prepare a sound and well-founded foreign policy strategy. The aim of this paper is to analyse the current position of the European Union in the global trading system, instruments of foreign trade policy, goals, foreign trade and the main challenges placed before the Union.
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Juang, J. C. "Analysis of global navigation satellite system position deviation under spoofing". IET Radar, Sonar & Navigation 3, n. 1 (2009): 1. http://dx.doi.org/10.1049/iet-rsn:20070153.

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Boicov, Victor. "Global position system technology to monitoring auto transport in Latvia". Applied Technologies and Innovations 8, n. 3 (15 novembre 2012): 38–44. http://dx.doi.org/10.15208/ati.2012.14.

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YAMADA, Manabu, Yasuhiro TAKI e Yasuyuki FUNAHASHI. "Global Position and Attitude Control of an Airship System Against a Constant Wind Disturbance(Mechanical Systems)". Transactions of the Japan Society of Mechanical Engineers Series C 76, n. 767 (2010): 1770–79. http://dx.doi.org/10.1299/kikaic.76.1770.

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Sapaty, P. S. "Simulating distributed and global consciousness under spatial grasp paradigm". Mathematical machines and systems 4 (2020): 49–61. http://dx.doi.org/10.34121/1028-9763-2020-4-49-61.

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The interest to what is often called awareness, consciousness, also self-consciousness, has grown enormously in recent years, with many theories and publications trying to explain what this can actually mean and where can be located. The paper is investigating the possibility of using developed and tested in different countries Spatial Grasp model and technology (SGT) for simulation of different ideas and concepts related to global awareness and consciousness in distributed dynamic systems, with potential applications in intelligent system management, industrial development, space research, security, and defense. The main technology component, Spatial Grasp Language (SGL), allows us to obtain powerful and compact spatial solutions of different problems by directly expressing their top semantics while hiding traditional system organization and management routines inside networked implementation. The paper describes in SGL a traditional organization of two opposing swarms, called “chasers” and “targets”, randomly operating in expected area. It then enriches the chasers swarm with global awareness and a sort of migrating consciousness, further strengthened by external super-consciousness capability, which allows it to drastically improve performance and make important nonlocal decisions, while moving to superior position over opposing targets swarm. Despite simplicity of the shown practical example, it gives us hope for the use of SGT for simulation of much broader and complex areas linked with consciousness like, for example, brain's biomolecular processes and basic structure of the universe. The developed networking technology can be implemented even in traditional university environments, as was done in the past for its previous versions in different countries.
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Rico-González, Markel, José Pino-Ortega, Fabio Y. Nakamura, Felipe Arruda Moura, Daniel Rojas-Valverde e Asier Los Arcos. "Past, present, and future of the technological tracking methods to assess tactical variables in team sports: A systematic review". Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 234, n. 4 (1 luglio 2020): 281–90. http://dx.doi.org/10.1177/1754337120932023.

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The main aim of this work was to review the use of technological tracking methods to assess collective spatial-positioning variables in team sports. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines and PICO design for systematic reviews, study identification was performed in four databases (PubMed, SPORTDiscus, ProQuest Central, and Web of Science). Articles were selected if they focused on player position and technological tracking methods. After duplicate removal, 2194 articles were identified based on the established search criteria, of which 72 articles were selected and analysed. Semi-automatic optic-based systems, Global Positioning System/Global Navigation Satellite Systems, and local positioning systems were used in 60%, 33% and 7% of the studies, respectively. All studies that measured tactical variables by local positioning system technology in team sports used local position measurement technology. Optic-based systems were used more often in the early years to analyse collective tactical behaviour during competition. Later, Global Positioning System/Global Navigation Satellite Systems became more frequent to measure behaviour in team sports during the training process. The possibility of using the same system during competition and training will facilitate the assessment of collective tactical behaviour in team sports.
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Choi, Won Hyuck, e Min Seok Jie. "Development of Smart Remote Local Information Embedded System Using Global Positioning System". Applied Mechanics and Materials 681 (ottobre 2014): 51–56. http://dx.doi.org/10.4028/www.scientific.net/amm.681.51.

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In case of existing localization system, it usually depends on video information by camera. Therefore, the camera has to be operated 24 hours a day. For the special region of interest, position recognition is available, however, for the most cases, once the camera is out of observed extent, the position recognition is not available. In order to back up these disadvantages, the Wireless Sensor Network, by using GPS and various sensors, can detect and monitoring the data up to the area which the image information cannot detect. For this, the thesis suggests the efficient monitoring system using GPS and human body detecting sensor.
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SERÄ°N, Zehra Vildan. "Global Governance and Turkey’s Position in the Post-Global Crisis Period". Journal of Social and Development Sciences 5, n. 1 (30 marzo 2014): 7–13. http://dx.doi.org/10.22610/jsds.v5i1.800.

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Following the most recent global crisis, the necessity for a new structuring in which developing countries more actively participate in the processes of global governance has become a current issue. The aim of this paper is to offer answers to the question that how should be a governance model in which China, Turkey, Brazil, India and other G-20 countries are more active decision-makers, instead of an international monetary system dominated by the USA. Firstly, the cause of the crisis, that is, the fact that USD relatively ceased to be the reserve money will be analyzed. Secondly, the process of transformation in the IMF administration in a way to allow G-20 countries a more active participation will be addressed. Finally, Turkey’s role in the restructuration of the global financial system -a process which had stemmed from the emergence of global governance through the integration of capital markets and excessive deregulation- will be analyzed, and policy recommendations for better global governance will be discussed.
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Rider, A. T., P. W. McOwan e A. Johnston. "Motion-induced position shifts in global dynamic Gabor arrays". Journal of Vision 9, n. 13 (1 dicembre 2009): 8. http://dx.doi.org/10.1167/9.13.8.

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Dvorkin, V. V., e S. N. Karutin. "Construction of a system for precise determination of the position of users of global navigation satellite systems". Measurement Techniques 54, n. 5 (agosto 2011): 517–23. http://dx.doi.org/10.1007/s11018-011-9759-z.

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Zalewski, Paweł. "Integrity Concept for Maritime Autonomous Surface Ships’ Position Sensors". Sensors 20, n. 7 (7 aprile 2020): 2075. http://dx.doi.org/10.3390/s20072075.

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The primary means for electronic position fixing currently in use in majority of contemporary merchant ships are shipborne GPS (Global Positioning System) receivers or DGPS (Differential GPS) and IALA (International Association of Lighthouse Authorities) radio beacon receivers. More advanced GNSS (Global Navigation Satellite System) receivers able to process signals from GPS, Russian GLONASS, Chinese Beidou, European Galileo, Indian IRNSS, Japan QZSS, and satellite-based augmentation systems (SBAS), are still relatively rare in maritime domain. However, it is expected that such combined or multi-system receivers will soon become more common in maritime transport and integrated with gyro, inertial, radar, laser, and optical sensors, and they will become indispensable onboard maritime autonomous surface ships (MASS). To be prepared for a malfunction of any position sensors, their state-of-the-art integrity monitoring should be developed and standardized, taking into account the specificity of MASS and e-navigation safety. The issues of existing requirements, performance standards, and future concepts of integrity monitoring for maritime position sensors are discussed and presented in this paper.
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Miao, Zhi-Yong, Yun-Long Lv, Ding-Jie Xu, Feng Shen e Shun-Wan Pang. "A Novel Global Position System Signal Tracking Loop Under Dynamic Environments". Journal of Computational and Theoretical Nanoscience 13, n. 1 (1 gennaio 2016): 169–78. http://dx.doi.org/10.1166/jctn.2016.4786.

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Herring, Thomas A., Danan Dong e Robert W. King. "Sub-milliarcsecond determination of pole position using Global Positioning System data". Geophysical Research Letters 18, n. 10 (ottobre 1991): 1893–96. http://dx.doi.org/10.1029/91gl02306.

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M.Prakash, Dr, S. Nithyanantham, V. Nishanth, A. Prakash e D. Kaviyarrasu. "Smart city ambulance for tracking shortest path using global position system". International Journal of Engineering & Technology 7, n. 1.3 (31 dicembre 2017): 187. http://dx.doi.org/10.14419/ijet.v7i1.3.10668.

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Traffic overcrowding and tidal flow management were identified as major problems in modern urban areas, which have caused much uncomfortable for the ambulance. Moreover, road accidents in the city have been nonstop and to bar the loss of life due to the accidents is even more crucial. To implement this, we introduce a scheme called Smart city ambulance system using shortest path finding algorithm and traffic signals. The main theme behind this scheme is to provide a smooth flow for the ambulance to reach the hospitals in time and thus minifying the expiration. The ambulance driver will send the request to control room. After receiving the request from control room then the ambulance is controlled by the control room which furnishes the most scant route to the ambulance and also controls the traffic light according to the ambulance location and thus reaching the hospital safely. The control room will send the alert message to the hospital. This scheme is fully controlled by control room, thus it controls the traffic lights, helping to reach the hospital in time using the shortest path Dijkstra algorithm
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Li, Wei, Deren Gong, Meihong Liu, Ji'an Chen e Dengping Duan. "Adaptive robust Kalman filter for relative navigation using global position system". IET Radar, Sonar & Navigation 7, n. 5 (giugno 2013): 471–79. http://dx.doi.org/10.1049/iet-rsn.2012.0170.

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Bhushana Rao, G. Sasi. "Ionospheric Delay Estimation for Improving the Global Positioning System Position Accuracy". IETE Journal of Research 54, n. 1 (gennaio 2008): 23–29. http://dx.doi.org/10.1080/03772063.2008.10876178.

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Wang, X., X. Shao, D. Gong e D. Duan. "Improved adaptive Huber filter for relative navigation using global position system". Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 225, n. 7 (6 giugno 2011): 769–77. http://dx.doi.org/10.1177/0954410011399226.

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Chen, Wan-Jia, Chi-Hua Chen, Bon-Yeh Lin e Chi-Chun Lo. "A Traffic Information Prediction System Based on Global Position System-Equipped Probe Car Reporting". Advanced Science Letters 16, n. 1 (1 settembre 2012): 117–24. http://dx.doi.org/10.1166/asl.2012.2192.

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Punčochář, Ivo, Jan Škach, Miroslav Šimandl e Ladislav Král. "Nonlinear analysis of position estimate in global navigation satellite systems". Journal of Physics: Conference Series 570, n. 1 (16 dicembre 2014): 012005. http://dx.doi.org/10.1088/1742-6596/570/1/012005.

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Kalenyuk, Iryna, Liudmyla Tsymbal, Antonina Djakona e Evelina Panchenko. "Assessment of intellectual leadership under global competition". Problems and Perspectives in Management 16, n. 4 (14 novembre 2018): 212–23. http://dx.doi.org/10.21511/ppm.16(4).2018.18.

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The formation of knowledge economy issues of leadership is being actualized in today’s global environment under the influence of globalization. An important aspect is the provision of subjects of various levels of intellectual leadership, which means achieving a high position in the competition due to high quality and intensity of the implementation of intellectual resources. The purpose is to justify methodological approaches to the assessment of intellectual leadership and to analyze its manifestation at the level of intellectual resources. The object is the processes of competition and achievement of intellectual leadership of countries in the global environment. The methodical approaches to the evaluation of intellectual leadership of different subjects at three levels (resources, results, outcomes) are offered. The intellectual leadership of countries at the level of resources is empirically analyzed by using the methods of comparative, system-structured, quantitative and qualitative analysis.By the level of intellectual leadership of the first order (accumulated intellectual resources), 32 countries have been identified as leaders, including highly developed countries and emerging active players. The unconditional leaders are the United States and China, whose relative figures are lower due to the large GDP and the population. Norway and Sweden have the highest presence in all TOP lists (6 indicators), in the second place – Finland and Switzerland (5 indicators), Australia, Brazil, New Zealand at all share the third position (4 indicators). Developed countries are predominantly leaders in terms of the formation of intellectual leadership. Outsider countries get on the list of leaders by individual indicators.
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Stahovec, Joseph G. "GLOBAL POSITIONING SYSTEM-BASED POLLUTION RESPONSE ASSET TRACKING SYSTEM (RATS)". International Oil Spill Conference Proceedings 1997, n. 1 (1 aprile 1997): 899–903. http://dx.doi.org/10.7901/2169-3358-1997-1-899.

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ABSTRACT The U.S. Navy's Supervisor of Salvage (SUPSALV) Response Asset Tracking System (RATS) was developed to provide enhanced safety and logistics support, improve worldwide contingency planning capabilities, and increase operational responsiveness through automated tracking of oil spill containment and recovery equipment. RATS's worldwide tracking capability is accomplished by combining Global Positioning System (GPS) technology with VHF and INMARSAT-C transmission links. The system allows the equipment's position to be automatically overlaid on digitized mapping systems and nautical charts. The application of GPS-based RATS technology to oil spill containment and recovery scenarios greatly enhances “command and control” and operational effectiveness.
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Li, Wenyi, Gang Liu, Xiaowei Cui e Mingquan Lu. "Feature-Aided RTK/LiDAR/INS Integrated Positioning System with Parallel Filters in the Ambiguity-Position-Joint Domain for Urban Environments". Remote Sensing 13, n. 10 (20 maggio 2021): 2013. http://dx.doi.org/10.3390/rs13102013.

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As the modern navigation business evolves, demands for high-precision positioning in GNSS-challenged environments increase, and the integrated system composed of Global Navigation Satellite System (GNSS)-based Real-Time Kinematic (RTK), inertial system (INS), Light Detection and Ranging (LiDAR), etc., is accepted as the most feasible solution to the issue. For prior-map-free situations, as the only sensor with a global frame, RTK determines and maintains the global positioning precision of the integrated system. However, RTK performance degrades greatly in GNSS-challenged environments, and most of the existing integrated systems adopt loose coupling mode, which does nothing to improve RTK and, thus, prevents integrated systems from further improvement. Aiming at improving RTK performance in the RTK/LiDAR/INS integrated system, we proposed an innovative integrated algorithm that utilizes RTK to register LiDAR features while integrating the pre-registered LiDAR features to RTK and adopts parallel filters in the ambiguity-position-joint domain to weaken the effects of low satellite availability, cycle slips, and multipath. By doing so, we can improve the RTK fix rate and stability in GNSS-challenged environments. The results of the theoretical analyses, simulation experiments, and a road test proved that the proposed method improved RTK performance in GNSS-challenged environments and, thus, guaranteed the global positioning precision of the whole system.
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37

Gucma, Maciej. "New threat to global transport. GNSS Receiver Spoofing". Archives of Transport 35, n. 3 (30 settembre 2015): 7–14. http://dx.doi.org/10.5604/08669546.1185170.

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Abstract (sommario):
Transport and logistics in XXI century relies on the several technical systems for assuring safe and reliable operations. One of widely used systems are satellite positioning systems, used to monitoring transport means and cargo itself. Reliability of the whole transport chain is often combined with singular reliability of satellite monitoring system. Possible threats to precise positioning of any vehicle is GNSS (Global Navigation Satellite System) deliberate interference. So called spoofing interference can mislead receiver in transport objective for reporting entirely wrong position and timing. To fight with this phenomena’s antispoofing techniques are developed. This paper will provide a review of late researches in field of GNSS anti-spoofing on the side of receiver. GNSS receiver vulnerabilities for a spoofer (device) attack will be presented as well as anti-spoofing algorithms. Possible limitation, costs as well as countermeasures methods will be shown thoroughly. Some of recent trends in anti-spoofing techniques in the world will be outlined up to date.
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38

Zou, Deyue, Shutong Niu, Shuhao Chen, Binhong Su, Xinyi Cheng, Jie Liu, Yunfeng Liu e Yang Li. "A smart city used low-latency seamless positioning system based on inverse global navigation satellite system technology". International Journal of Distributed Sensor Networks 15, n. 9 (settembre 2019): 155014771987381. http://dx.doi.org/10.1177/1550147719873815.

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People have to move between indoor and outdoor frequently in city scenarios. The global navigation satellite system signal cannot provide reliable indoor positioning services. To solve the problem, this article proposes a seamless positioning system based on an inverse global navigation satellite system signal, which can extend the global navigation satellite system service into the indoor scenario. In this method, a signal source is arranged at a key position in the room, and the inverse global navigation satellite system signal is transmitted to the global navigation satellite system receiver to obtain a preset positioning result. The indoor positioning service is continued with the inertial navigation system after leaving the key position. The inverse global navigation satellite system seamless positioning system proposed in this article can unify indoor and outdoor positioning using the same receiver. The receiver does not need to re-receive navigation information when the scene changes, which avoids the switching process. Through the design of signal layer coverage, the receiver is in a warm start state, and the users can quickly fix the position when the scenario changes, realizing quick access in a true sense. This enables the ordinary commercial global navigation satellite system receiver to obtain indoor positioning capability without modification, and the algorithm can perform accurate positioning indoors and outdoors without switching.
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39

Haddadi Amlashi, H., F. Samadzadegan, F. Dadrass Javan e M. Savadkouhi. "COMPARING THE ACCURACY OF GNSS POSITIONING VARIANTS FOR UAV BASED 3D MAP GENERATION". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2020 (6 agosto 2020): 443–49. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2020-443-2020.

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Abstract. GNSS stands for Global Navigation Satellite System and is the standard generic term for satellite navigation systems that provide autonomous geo-spatial positioning with global coverage. The advantage of having access to multiple satellites is accuracy, redundancy, and availability at all the times. Though satellite systems do not often fail, if one fails GNSS receivers can pick up signals from other systems. If the line of sight is obstructed, having access to multiple satellites is also a benefit. GPS (Global Positioning System, USA), GLONASS (Global Navigation Satellite System, Russia), BeiDou (Compass, China), and some regional systems are positioning systems that are usually used. In recent years with the development of the UAVs and GNSS receivers, it is possible to manage an accurate PPK (Post Processing Kinematic) networks with a GNSS receiver mounted on a UAV to achieve the position of images principal points WGS1984 and to reduce the need for GCPs. But the most important challenge in a PPK task is, which a combination of different GNSS constellations would result in the most accurate computed position in checkpoints. For this purpose, this study focused on a PPK equipped UAV to map an open pit (Golgohar mine near Sirjan city). For the purpose, different combination of GPS, GLONASS and BeiDou used for position computed. Results are plotted and compared and found out having access to multiple constellations while doing a PPK task would bring higher accuracies in building photogrammetric models although it may cause some random error due to the higher values of noise while the number of the satellites increases.
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40

Rider, A., e A. Johnston. "Motion-induced position shifts are based on global motion estimates". Journal of Vision 9, n. 8 (24 marzo 2010): 655. http://dx.doi.org/10.1167/9.8.655.

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41

Fabbiano, Ruggero, Federica Garin e Carlos Canudas de Wit. "Distributed Source Seeking Without Global Position Information". IEEE Transactions on Control of Network Systems 5, n. 1 (marzo 2018): 228–38. http://dx.doi.org/10.1109/tcns.2016.2594493.

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42

Nord, Gail D., David Jabon e John Nord. "Activities: The Mathematics of the Global Positioning System". Mathematics Teacher 90, n. 6 (settembre 1997): 455–60. http://dx.doi.org/10.5951/mt.90.6.0455.

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Abstract (sommario):
Teacher's Guide: The Global Positioning System (GPS) is a constellation of twenty-four satellites, orbiting approximately 20 200 km above sea level, that enable receivers to compute their position anywhere on the earth with remarkable accuracy. The mathematical theory and computation involved in the GPS are within the scope of the second-year-algebra curriculum. This activity illustrates an application of mathematics to modern navigation.
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43

Siejka, Zbigniew. "Validation of the Accuracy and Convergence Time of Real Time Kinematic Results Using a Single Galileo Navigation System". Sensors 18, n. 8 (25 luglio 2018): 2412. http://dx.doi.org/10.3390/s18082412.

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Abstract (sommario):
For the last two decades, the American GPS and Russian GLONASS were the basic systems used in global positioning and navigation. In recent years, there has been significant progress in the development of positioning systems. New regional systems have been created, i.e., the Japanese Quasi-Zenith Satellite System (QZSS) and Indian Regional Navigational Satellite System (IRNSS). A plan to build its own regional navigation system named Korean Positioning System (KPS) was announced South Korea on 5 February 2018. Currently, two new global navigation systems are under development: the European Galileo and the Chinese BeiDou. The full operability of both systems by 2020 is planned. The paper deals with a possibility of determination of the user’s position from individual and independent global navigation satellite system (GNSS). The article is a broader concept aimed at independent determination of precise position from individual GPS, GLONASS, BeiDou and Galileo systems. It presents real time positioning results (Real Time Kinematic-RTK) using signals from Galileo satellites only. During the test, 14 Galileo satellites were used and the number of simultaneously observed Galileo satellites varied from five to seven. Real-time measurements were only possible in certain 24-h observation windows. However, their number was completed within 6 days at the end of 2017 and beginning of 2018, so there was possible to infer about the current availability, continuity, convergence time and accuracy of the RTK measurements. In addition, the systematic errors were demonstrated for the Galileo system.
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44

Lindqwister, Ulf J., Adam P. Freedman e Geoffrey Blewitt. "Daily estimates of the Earth's pole position with the global positioning system". Geophysical Research Letters 19, n. 9 (4 maggio 1992): 845–48. http://dx.doi.org/10.1029/92gl00576.

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45

Omae, Manabu, e Takehiko Fujioka. "Experimental Study on Application of DGPS-based Position Information to Automatic Driving Control". Journal of Robotics and Mechatronics 13, n. 4 (20 agosto 2001): 340–51. http://dx.doi.org/10.20965/jrm.2001.p0340.

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Abstract (sommario):
Experimental studies are conducted for investigating the possibility of automatic driving control systems based on absolute position information. Implementation of such control system requires a methodology of measuring the absolute position, and a control algorithm. In this paper, an accurate and real-time estimation of the absolute position by use of DGPS (Differential Global Positioning System) and sensors on a controlled vehicle is proposed. Automatic steering controller, automatic evasive controller, and a method of relative position measurement of neighboring vehicles are also proposed as application of position information to automatic driving control. Experiments are conducted using sedan-type vehicles. Experimental results validate the proposed estimation and control system, and provide the perspective of enhancing the automatic driving control system by use of the absolute position information.
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46

Assimakis, Nicholas, e Maria Adam. "Global Systems for Mobile Position Tracking Using Kalman and Lainiotis Filters". Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/130512.

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Abstract (sommario):
We present two time invariant models for Global Systems for Mobile (GSM) position tracking, which describe the movement inx-axis andy-axis simultaneously or separately. We present the time invariant filters as well as the steady state filters: the classical Kalman filter and Lainiotis Filter and the Join Kalman Lainiotis Filter, which consists of the parallel usage of the two classical filters. Various implementations are proposed and compared with respect to their behavior and to their computational burden: all time invariant and steady state filters have the same behavior using both proposed models but have different computational burden. Finally, we propose a Finite Impulse Response (FIR) implementation of the Steady State Kalman, and Lainiotis filters, which does not require previous estimations but requires a well-defined set of previous measurements.
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47

D'Eon, Stephen P. "Accuracy and signal reception of a hand-held Global Positioning System (GPS) receiver". Forestry Chronicle 71, n. 2 (1 aprile 1995): 192–96. http://dx.doi.org/10.5558/tfc71192-2.

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Accurate and precise reporting of forest survey locations is required to integrate forest survey data with Geographical Information Systems. The accuracies of five Global Positioning System (GPS) survey methods using a hand-held receiver were tested in a mixed forest of trembling aspen and spruce. Accuracy improved by eliminating positions obtained under poor satellite configurations and by using position averaging methods. Single fix positions, taking as little as two minutes to obtain, yielded better than 100m accuracy more than 80% of the time. Allowing the receiver to continuously collect fixes for 15 to 30 minutes and then averaging the fixes yielded a median position error of 17 m. Sixty one stands representing a diversity of cover types, canopy heights, and crown closure in the Petawawa Research Forest were tested during June and July of 1992 for canopy interference with GPS signals. A GPS position was obtained under the canopy in 74% of the stands. Launches of additional GPS satellites since the summer of 1992 have further improved the probability of obtaining accurate geographical positions under forest canopies. Key words: global positioning system, position accuracy, signal reception, canopy interference
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48

Komyagin, Sergey. "EVALUATION OF THE ACCURACY OF STATEMENT OF THE WAY TO THE PROJECT STATUS WITH ACS-3D". Interexpo GEO-Siberia 1, n. 1 (2019): 119–29. http://dx.doi.org/10.33764/2618-981x-2019-1-1-119-129.

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The article deals with the problem of setting the railway track in the design position. Identi-fied shortcomings of existing systems of automated management of construction machinery. The technology of setting the path in the design position of the automated control systems based on global navigation satellite systems, the technical implementation of the system.Presents the problem of the use of technologies based on geoinformation system in creating repair projects, construction (repairs) and operational work, particularly the lack of electronic projects for the automated control systems based on global navigation satellite systems. Is a principle of updating project data, namely the geometrical parameters, before the production of works and the creation of electronic projects. Considered part of the electronic project for ACS-3D straightening techniques. The evaluation of the accuracy of staging the way to the design position of the geometric parameters and compares the results with the requirements of regulatory documents.
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49

Bhardwaj, Ashutosh. "Terrestrial and Satellite-Based Positioning and Navigation Systems—A Review with a Regional and Global Perspective". Engineering Proceedings 2, n. 1 (14 novembre 2020): 41. http://dx.doi.org/10.3390/ecsa-7-08262.

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Abstract (sommario):
Satellite-based navigation techniques have revolutionized modern-day surveying with unprecedented accuracies along with the traditional and terrestrial-based navigation techniques. However, the satellite-based techniques gain popularity due to their ease and availability. The position and attitude sensors mounted on satellites, aerial, and ground-based platforms as well as different types of equipment play a vital role in remote sensing providing navigation and data. The presented review in this paper describes the terrestrial (LORAN-C, Omega, Alpha, Chayka) and satellite-based systems with their major features and peculiar applications. The regional and global navigation satellite systems (GNSS) can provide the position of a static object or a moving object i.e., in Kinematic mode. The GNSS systems include the NAVigation Satellite Timing And Ranging Global Positioning System (NAVSTAR GPS), of the United States of America (USA); the Globalnaya navigatsionnaya sputnikovaya sistema (GLObal NAvigation Satellite System, GLONASS), of Russia; BEIDOU, of China; and GALILEO, of the European Union (EU). Among the initial satellite-based regional navigation systems included are the TRANSIT of the US and TSYKLON of what was then the USSR which became operational in the 1960s. Regional systems developed in the last decade include the Quasi-Zenith Satellite System (QZSS) and the Indian Regional Navigation Satellite System (IRNSS). Currently, these global and regional satellite-based systems provide their services with accuracies of the order of 10–20 m using the trilateration method of surveying for civil use. The terrestrial and satellite-based augmented systems (SBAS) were further developed along with different surveying techniques to improve the accuracies up to centimeters or millimeter levels for precise applications.
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50

Tanaka, Takayuki, Yasunori Yamazaki, Hiroki Watanabe, Takeshi Katae e Kazuo Yamafuji. "Self-Position Detection System Using a Visual-Sensor for Mobile Robots". Journal of Robotics and Mechatronics 11, n. 1 (20 febbraio 1999): 17–24. http://dx.doi.org/10.20965/jrm.1999.p0017.

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Abstract (sommario):
We have been developing an intelligent mobile robot for use as an office building secretary or aid during the day and a security guard or maintenance engineer, e.g., for cleaning floors, at night. Since the robot works and moves autonomously among people in an office environment, it must be able to recognize its own location and environment. We proposed two types of self-positoin detection based on a visual sensor. One is global self-positioning (GSP) by recognizing a room number. The other is local self-positioning (LSP) calculating the relationship between the robot and three light landmarks such as two exit lamps and a fire hydrant lamp in corridors. Experiments verified the effectiveness of the robot's self-position detection.
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