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Štefanisko, Ivan. "Integration of inertial navigation with global navigation satellite system." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221167.
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This paper deals with study of inertial navigation, global navigation satellite system, and their fusion into the one navigation solution. The first part of the work is to calculate the trajectory from accelerometers and gyroscopes measurements. Navigation equations calculate rotation with quaternions and remove gravity sensed by accelerometers. The equation’s output is in earth centred fixed navigation frame. Then, inertial navigation errors are discussed and focused to the bias correction. Theory about INS/GNSS inte- gration compares different integration architecture. The Kalman filter is used to obtain navigation solution for attitude, velocity and position with advantages of both systems.
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Tetewsky, Avram Ross Jeff Soltz Arnold Vaughn Norman Anszperger Jan O'Brien Chris Graham Dave Craig Doug Lozow Jeff. "Making sense of inter-signal corrections : accounting for GPS satellite calibration parameters in legacy and modernized ionosphere correction algorithms /." [Eugene, Ore. : Gibbons Media & Research], 2009. http://www.insidegnss.com/auto/julyaug09-tetewsky-final.pdf.
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"Author biographies are available in the expanded on-line version of this article [http://www.insidegnss.com/auto/julyaug09-tetewsky-final.pdf]""July/August 2009." Web site title: Making Sense of GPS Inter-Signal Corrections : Satellite Calibration Parameters in Legacy and Modernized Ionosphere Correction Algorithms.
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Liu, Langtao. "An intelligent differential GPS navigation system." Thesis, Brunel University, 1997. http://bura.brunel.ac.uk/handle/2438/5219.
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This thesis describes an Intelligent Differential GPS Navigation System developed for a PhD research project. The first part of the work was to apply differential technology to Global Positioning System to locate the current position of the user with an improved positioning accuracy. The essential part of this Differential GPS system is a Differential GPS Reference Station. This DGPS Reference Station includes a DGPS mathematical model and the corresponding algorithms, which calculates the differential correction messages. These messages are then transmitted to a mobile GPS receiver by a radio data link. By using these corrections, the mobile GPS receiver's positioning accuracy can be improved from about 100 m to 4 m. This DGPS Reference station has been used to implement system software for this research. Differential correction algorithms were modified, characteristics of system components were changed, and different digital filters were also applied at different locations to investigate the impact on system performance. Besides all these capabilities which are needed for the research purpose, this DGPS Reference Station has all the standard functions, and can be used as a standard DGPS Reference Station. The second part of the work was to combine this Differential GPS system with a suitable digital map to form a navigation system. A suitable digital map database was chosen and modified, and the content of the map was then reproduced on the mobile GPS receiver's host PC screen. This digital map, combined with the current location of the user, provides the basic navigational information for the user to reach a desired destination. To help the user further and demonstrate the potential use of the system, an intelligent route-planing algorithm that can produce the optimum route automatically was also designed. The system integration was achieved by the design of the mobile navigation unit and the combination of this mobile navigation unit with the constructed DGPS Reference Station. The final system consists of a DGPS Reference Station, a UHF radio data transmitter, a mobile GPS receiver, a digital map system, a route searching and planing algorithm and a UHF radio data receiver. Field trials were carried out to test the system static and dynamic performances. Repeated experiments showed that both the static and dynamic positioning accuracies were within the range of 4 meters. The constructed system is a prototype navigation system which incorporates the basic navigational functions. It is envisaged that this system can be directly used, or further developed to suit a special need, as required. A typical application of the system would be to guide a user to a desired destination. Other examples include: aircraft autolanding control system, car self-driving, taxi fleet control, criminal tracing and personal navigation systems.
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Blunt, Paul. "Advanced global navigation satellite system receiver design." Thesis, University of Surrey, 2007. http://epubs.surrey.ac.uk/842714/.
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The research described by this thesis was undertaken at a very timely moment in the development of global navigation satellite systems (GNSS). During the course of this work the signal structure of an entirely new generation of GNSS signals was been defined. The first satellites producing a new range of different coding and modulation schemes have been launched, initiating the modernisation of the American GPS and the introduction of the European Galileo system. An important aspect of the new signal structure for both GPS modernisation and Galileo is an entirely new kind of modulation called BOC (Binary Offset Carrier). Despite certain advantages this modulation comes with the notorious characteristic of a multi-peaked correlation function. In our view all known receivers, or receiver principles, have problems with this: either because the receiver is not fail safe and is potentially unreliable (the so-called bump-jumping receiver); or the multi-peaks are eliminated at the very substantial cost in much degraded accuracy. During my research under Dr Hodgart what seems to be an entirely new and original method has been developed which entirely solves the problem of tracking BOC. The problem of multi-peaks goes away and there is no loss of potential accuracy. This thesis describes in detail this invention and the first experimental results. This research was carried out at the University of Surrey under the joint supervision of Surrey Space Centre and Surrey Satellite Technology Ltd. Shortly before this work began SSTL achieved a contract to design and build the first ever test satellite (Giove- A) of the Galileo signals and technology. This research contributed to the design and manufacture of a Galileo signal generator which was flown on-board the satellite (launched December 2005). Expanding upon SSTL's existing designs this work enabled the design and creation appropriate receivers to monitor the transmissions both in ground based emulations and real live tests after launch. These designs are intended to be the core of future SSTL space receivers. This thesis describes in detail the creation of both transmitter and receiver architectures for the testing and evaluation of GNSS signals.
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Andrade, Alessandra Arrojado Lisbôa de. "Navigating into the new millennium : the global navigation satellite system regulatory framework." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64258.pdf.
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Cheng, Chao-heh. "Calculations for positioning with the Global Navigation Satellite System." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176839268.
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Park, Jihye. "IONOSPHERIC MONITORING BY THE GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS)." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339715308.
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Macedo, Scavuzzi Dos Santos Juliana. "The liability of global navigation satellite system (GNSS) used for air navigation in Brazil." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119329.
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The use of Global Navigation Satellite System (GNSS) for air navigation brings important advantages to aviation since it is able to reduce routes, save fuel and diminish greenhouse gas emissions. It is also a more flexible and precise navigational aid that improves flight operations at critical moments such approach, landing and take-off. However, the GNSS signal may fail; and depending on the moment of this failure, its failure could cause an accident. Therefore, air navigation service providers' liability in using GNSS is a concern. Since there is no international treaty that responds to the liability of the GNSS and of air navigation service providers, national solutions appear as a practical and necessary answer to liability claims. Brazil has already started using GNSS in air navigation, and it has a Ground Based Augmentation System (GBAS) that is being tested at Rio de Janeiro International Airport. Therefore, it is important to study the Brazilian liability regime in order to determine if its general liability rules, especially its governmental liability system could apply to the civil liability of the air navigation service providers using GNSS in case of an accident caused by a signal failure. These claims are mostly governed by government liability in Brazil and the legal system in place is able to respond to them. However, since there is much controversy regarding government liability under the Brazilian doctrine, a specific legislation that would be able to balance the different interests at stake seems a reasonable option.L'utilisation du Système de positionnement par satellites (GNSS) pour la navigation aérienne offre de nombreux avantages à l'aviation puisqu'il est en mesure de réduire les itinéraires, d'économiser de l'essence et de diminuer les émissions de gaz à effet de serre. Il constitue également une aide à la navigation plus flexible et plus précise qui améliore les opérations de vol à des moments critiques tels que l'approche, l'atterrissage, et le décollage. Cependant, le signal GNSS pourrait être défectueux. Dépendamment du moment de la défaillance du signal, celle-là pourrait causer un accident. Ainsi donc, la responsabilité des fournisseurs de services de navigation aérienne est sujette à préoccupation. Puisqu'aucun traité international ne se penche sur la question de la responsabilité du GNSS et des fournisseurs de services de navigation aérienne, des solutions nationales apparaissent comme des réponses pratiques et nécessaires aux revendications de responsabilité. Le Brésil a déjà commencé à utiliser la GNSS en navigation aérienne, et a un Ground Based Augmentation System (GBAS) qui est en train d'être testé à l'aéroport international de Rio de Janeiro. Ainsi donc, il est important d'étudier le régime de responsabilité brésilien pour déterminer si ses règles générales de responsabilité – et plus particulièrement son système de responsabilité gouvernemental – pourraient également s'appliquer à la responsabilité civile des fournisseurs de services de navigation aérienne utilisant le GNSS dans le cas d'un accident causé par une défaillance de signal. Ces revendications sont en grande partie gouvernées par la responsabilité gouvernementale au Brésil et le système légal en place pour y répondre. Cependant, puisqu'il y a beaucoup de controverse entourant la responsabilité du gouvernement sous la doctrine brésilienne, une législation spécifique qui serait en mesure d'équilibrer les différents intérêts en jeu semble être une alternative raisonnable.
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Li, Jian. "Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178220159.
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Bhanot, Sunil. "Implementation and optimization of a Global Navigation Satellite System software radio." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176840392.
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Andries, Stephanie. "The Global Navigation Satellite System (GNSS) and the European Galileo program /." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30283.
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The Global Navigation Satellite System (GNSS) is the main element of the CNS/ATM system elaborated by the International Civil Aviation Organization (ICAO).The US GPS and Russian GLONASS are the two existing systems. Both of them were created by the military.
Europe is currently developing a civil navigation satellite system: Galileo.
This thesis will present some legal issues of the GNSS discussed in the framework of ICAO: sovereignty of States, universal accessibility, continuity and quality of the service, cost recovery and financing, certification and liability.
It will also present some legal issues due to the creation of the European Galileo program. The financing, organizational framework, certification and liability will be examined. Finally, ICAO's Charter on the Rights and Obligations of States Relating to GNSS Services will be considered.
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Kouris, Aristodimos. "An incoherent correlator-based star tracking system for satellite navigation." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271771.
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Mukka, Nagaraju. "Simulink Based Modeling of a Multi Global Navigation Satellite System." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955011/.
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The objective of this thesis is to design a model for a multi global navigation satellite system using Simulink. It explains a design procedure which includes the models for transmitter and receiver for two different navigation systems. To overcome the problem, where less number of satellites are visible to determine location degrades the performance of any positioning system significantly, this research has done to make use of multi GNSS satellite signals in one navigation receiver.
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Chen, Luyi. "DUAL FREQUENCY PATCH ANTENNA DESIGN FOR GLOBAL NAVIGATION SATELLITE SYSTEM." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178633247.
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Lennen, G. R. "The application of digital techniques to Navstar GPS receiver design." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234682.
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Akos, Dennis M. "A software radio approach to Global Navigation Satellite System receiver design." Ohio University / OhioLINK, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1174615606.
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Weiss, Jan Peter. "Modeling and characterization of multipath in global navigation satellite system ranging signals." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284495.
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Turhan, Birol Erdem. "Optimisation of MF DGNSS, maritime and aeronautical radiobeacon coverage by frequency re-assignment." Thesis, Bangor University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298601.
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Aquino, Marcio Henrique Oliveira de. "Regional approach to wide area DGPS." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287196.
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Liu, Fan. "Analysis of integrity monitoring for the local area augmentation system using the global navigation satellite system." Ohio University / OhioLINK, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175192969.
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Tabatabaei, Balaei Asghar Surveying & Spatial Information Systems Faculty of Engineering UNSW. "Detection, characterization and mitigation of interference in receivers for global navigation satellite systems." Publisher:University of New South Wales. Surveying & Spatial Information Systems, 2007. http://handle.unsw.edu.au/1959.4/40545.
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GPS has become very popular in recent years. It is used in wide range of applications including aircraft navigation, search and rescue, space borne attitude and position determination and cellular network synchronization. Each application places demands on GPS for various levels of accuracy, integrity, system availability and continuity of service. Radio frequency interference (RFI) which results from many sources such as TV/FM harmonics, radar or mobile satellite systems, presents a challenge to the use of GPS. It can affect all the service performance indices mentioned above. To improve the accuracy of GPS positioning, a continuously operating reference station (CORS) network can be used. A CORS network provides all the enabled GPS users in an area with corrections to the fundamental measurements, producing more precise positioning. A threat to these networks is a threat to all high-accuracy GPS users. It is therefore necessary to monitor the quality of the received signal with the objective of promptly detecting the presence of RFI and providing a timely warning of the degradation of system accuracy, thereby boosting the integrity of GPS. This research was focused on four main tasks: a) Detection. The focus here is on a power spectral density fluctuation detection technique, in which statistical inference is used to detect narrowband continuous-wave (CW) interference in the GPS signal band after being captured by the RF front-end. An optimal detector algorithm is proposed. At this optimal point, for a fixed Detection Threshold (DT), probability of false alarm becomes minimal and for a fixed probability of false alarm, we can achieve the minimum value for the detection threshold. Experiments show that at this point we have the minimum computational load. This theoretical result is supported by real experiments. Finally this algorithm is employed to detect a real GPS interference signal generated by a TV transmitter in Sydney. b) Characterization. In the characterization section, using the GNSS signal structure and the baseband signal processing inside the GNSS receiver, a closed formula is derived for the received signal quality in terms of effective carrier to noise ratio ( ). This formula is tested and proved by calculating the C/No using the I and Q data from a software GPS receiver. For pulsed CW, a similar analysis is done to characterize the effect of parameters such as pulse repetition period (PRP) and also duty cycle on the received signal quality. Considering this characterization and the commonality between the GPS C/A code and Galileo signal as a basis to build up a common term for satellite availability, the probability of satellite availability in the presence of CW interference is defined and for the two currently available satellite navigation systems (GPS L1 signal and Galileo signal (GIOVE-A BOC(1, 1) in the E1/L1 band)) it is shown that they can be considered as alternatives to each other in the presence of different RFI frequencies as their availability in the presence of CW RFI is different in terms of RFI frequency. c) Mitigation. The last section of the research presents a new concept of ?Satellite Exclusion Zone?. In this technique, using our previously developed characterization techniques, and considering the fact that RFI has different effects on different satellite signals at different times depending on satellite Doppler frequency, the idea of excluding the most vulnerable satellite signal from positioning calculations is proposed. Using real data and real interference, the effectiveness of this technique is proven and its performance analyzed. d) Hardware implementation. The above detection technique is implemented using the UNSW FPGA receiver board called NAMURU.
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Andries, Stephanie. "The Global Navigation Satellite System (GNSS) and the European Galileo programme, legal issues." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64259.pdf.
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Bensoussan, Denis. "GNSS and Galileo Liability Aspects." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=93845.
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In the next coming years global satellite navigation systems (GNSS) will make part of our daily life, as the world is becoming "GNSS-dependant in the same way that it has become Internet-dependant". Indeed, more than ten years folowing the opening up to civilians of satellite-based navigation systems initially designed for military purposes, civil satellite navigation applications are becoming more and more numerous. The potential benefits have proven enormous in terms of transport safety and efficiency as well as for non-transport-related industries.Dans les toutes prochaines années, les systèmes globaux de navigation par satellite (GNSS) feront partie intégrante de notre vie quotidienne. En effet, un peu plus de dix ans après la libéralisation de l'accès des civils aux systèmes de navigation par satellite initialement conçus à des fins militaires, les applications civiles permises par la navigation par satellite sont de plus en plus nombreuses et les bénéfices potentiels sont énormes en matière de sécurité et d'efficacité des transports comme pour d'autres secteurs et industries. fr
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Belanger, Joseph Franncois Maurice. "Studey into the use of the global navigation satellite system for maritime structure analysis." Thesis, University of Southampton, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500836.
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Habrich, Heinz. "Geodetic applications of the global navigation satellite system (GLONASS) and of GLONASS/GPS combinations /." [S.l.] : [s.n.], 1999. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
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Lazarevskiy, Alexander, and Олександр Андрійович Лазаревський. "Navigation dead reckoning system based on a mobile phone." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/50760.
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1. S. Beauregard and H. Haas, “Pedestrian dead reckoning: A basis for personal positioning,” in Proceedings of the 3rd Workshop on Positioning, Navigation and Communication, March 2006, pp. 27–35.
2. A. R. Jimenez, F. Seco, C. Prieto, and J. Guevara, “A comparison of pedestrian dead-reckoning algorithms using a low-cost MEMS IMU,” in 2009 IEEE International Symposium on Intelligent Signal Processing, August 2009, pp. 37–42.
3. P. Kasebzadeh, C. Fritsche, G. Hendeby, F. Gunnarsson, and F. Gustafsson, “Improved pedestrian dead reckoning positioning with gait parameter learning” in 2016 19th International Conference on Information Fusion (FUSION), July 2016, pp. 379–385.
4. A. Brajdic, R. Harle, “Walk detection and step counting on unconstrained smartphones,” in Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing, September, 2013, pp. 225–234. https://doi.org/10.1145/2493432.2493449The problem of pedestrian dead reckoning (PDR) is referred to the class of individual navigation problems. The common solution in mobile phones is the use of satellite navigation (GPS, GLONASS, Galileo, etc.). But satellite signal sometimes can be jammed intentionally or lost due to obstacles in urban area. Also, the problem of PDR is interesting in the user localization in indoor environment such as large garages, city molls, etc. Instrumentation of smartphones is now based on Micro-Electro-Mechanical Sensors (MEMS) technology and includes standard set of Inertial Measurement Unit (IMU): accelerometers, gyroscopes, magnetometers and pressure sensor (optionally). Accelerometers can be used to detect step events and further to calculate lengths. But it is sensitive to walking speed, slope of the road, etc., which leads to inaccurate results of calculating the stride length. Also, as any dead reckoning technique PDR suffers from the cumulative error. Since the location estimate is always calculated based on the previous result, the error accumulates rapidly over time. This means that correction updates are necessary on regular basis.
Проблема обліку загибелі пішоходів (ОЗП) відноситься до класу індивідуальних проблем навігації. Загальним рішенням у мобільних телефонах є використання супутникової навігації (GPS, ГЛОНАСС, Galileo тощо). Але супутниковий сигнал іноді може бути заклинений навмисно або втрачений через перешкоди в міській місцевості. Крім того, проблема ОЗП цікава в локалізації користувачів у приміщенні, наприклад, у великих гаражах, міських торгових центрах тощо. Зараз прилади для смартфонів засновані на технології мікро-електромеханічні датчики (MEМД) і включають стандартний набір інерційних вимірювальних приладів (IВП): акселерометри, гіроскопи, магнітометри та датчик тиску (за бажанням). Акселерометри можна використовувати для виявлення крокових подій та подальшого обчислення довжин. Але він чутливий до швидкості ходьби, нахилу дороги тощо, що призводить до неточних результатів розрахунку довжини кроку. Крім того, як і будь-яка техніка розрахунок критичних випадків, ОЗП залежить від сукупної помилки. Оскільки оцінювання місця розташування завжди обчислюється на основі попереднього результату, помилка швидко накопичується з часом. Це означає, що необхідні регулярні оновлення виправлень.
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Ritchie, Douglas Allen. "Factors That Affect the Global Positioning System and Global Navigation Satellite System in an Urban and Forested Environment." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etd/2089.
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The purpose of this study was to evaluate the accuracy in real time measurements acquired from GPS and GLONASS satellite observations using RTK techniques in an urban and forested environment. To determine this accuracy, 2 data sets of 3-dimensional coordinates were created and compared at 14 stations situated at East Tennessee State University. One data set included coordinates determined by conventional land survey methods; the second was solved by RTK GPS/GLONASS. Once the magnitude of any deviation in the coordinate positions was determined, the contributions to the accuracies from cycle slips, multipath, satellite availability, PDOP, and fixed or float solutions were evaluated. Three points in the urban environment varied from the conventional data set. Multipath was assumed to be the major bias in these points. Seven points in the forested environment varied from the conventional data set. The use of float solutions and high PDOP may have caused this bias.
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Viswanatha, Raghunath. "Design and Simulation of Multi-Frequency Global Navigation Satellite System Receiver Radio Frequency Front-End." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1227298677.
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Su, Hua. "Precise orbit determination of global navigation satellite system of second generation (GNSS-2) orbit determination of IGSO, GEO and MEO satellites /." [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=962099635.
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Unwin, Martin. "The design and implementation of a small satellite navigation unit based on a global positioning system receiver." Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/844372/.
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This thesis describes the definition, implementation, and in-orbit testing of an autonomous navigation unit based upon a GPS receiver for use on board a small satellite in low Earth orbit. It explains the motivation for the use of GPS to provide this function, and describes the practical application and integration of this technology into an existing microsatellite system. Until now, the technology for any satellite to track itself has not existed. Space agencies spend significant funds supporting a network of tracking stations around the world for orbit determination. With the recent realisation of the Global Positioning System and the availability of inexpensive receiver hardware, it has become a practical proposition to include a GPS receiver within the demanding constraints of a small satellite. A GPS receiver on-board a satellite can eliminate the necessity for ground-based tracking by providing an autonomous orbit determination capability. During the course of these studies, the requirements and constraints of a small satellite were identified by the author and matched with the capabilities of a GPS receiver. A GPS Navigation Unit was defined to provide autonomous services available oil demand for the satellite platform and payloads; position and velocity; time synchronisation; orbital elements; payload triggering and GPS data logging (for experimental and research purposes). The GPS Navigation Unit includes a processing facility capable of command and initialisation of the GPS receiver, and data processing to give orbit determination capability. When used on a microsatellite, the additional constraints of low power consumption necessitate the intermittent operation of the GPS receiver. To test the concept of the GPS Navigation Unit, a commercial Trimble TANS II GPS receiver system that had been modified for orbital velocities was integrated into the PoSAT-1 microsatellite which was launched into low Earth orbit in September 1993. A method for orbit determination was developed for use with the output from the GPS receiver, and the GPS Navigation Unit was implemented in software according to the constraints of the PoSAT-1 mission. The significant results from these studies include: The first use of a GPS receiver on a microsatellite, PoSAT-1. The implementation, test and validation of a GPS Navigation Unit in low Earth orbit. The first satellite mission to demonstrate the capability for autonomous orbit determination through the GPS Navigation Unit. The definition of the general-purpose interfaces between a small satellite and a satellite- borne GPS Navigation Unit.
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Tran, Khoa Anh. "Automatic Identification of Points of Interest in Global Navigation Satellite System Data: A Spatial Temporal Approach." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4595.
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In addition to the emergence of smartphones and tablets in recent years, the rise of Global Navigation Satellite Systems (GNSS) has allowed mobile tracking applications to become popular and be put into many uses. Analyzing tracking records to identify points of interest (POIs) is useful for both prediction applications and research such as human behavior analysis, transportation planning, and especially travel surveys. Past research in travel surveys has shown that a GPS mobile phone-based survey is a useful tool for collecting information about individuals. Moreover, a passive travel survey collection is preferred to an active travel survey method by the respondents and the analysts because it is proven to be less error prone. However, passive collection remains a challenge due to a lack of high accuracy algorithms to automatically identify trip starts and trip ends. While travel surveys need a POI identification algorithm to carry out passive information collection, mobile tracking applications must be careful not to affect the user's battery life, which limits the number of GPS coordinates that can be recorded and therefore affects the accuracies of existing POI identification algorithms. This thesis presents Automatic Spatial Temporal Identification of Points of Interest (ASTIPI), an unsupervised spatial temporal algorithm to identify POIs. ASTIPI utilizes the temporal and spatial properties of the dataset to obtain a high accuracy of POI identification, even on a reduced GPS dataset that uses techniques to conserve battery life on mobile devices. While reducing outliers within POIs, ASTIPI also has a linear running time and maintains the temporal orders of the location data so that arrival and departure information can be easily extracted and thus, users' trips can be quickly identified. Using data from real mobile devices, evaluations of ASTIPI and other existing algorithms are performed, showing that ASTIPI obtains the highest accuracy of POI identification with an average accuracy of 88% when performing on full datasets generated using the GPS Auto-Sleep module and an average accuracy of 59% when performing on a reduced dataset generated using both the GPS Auto-Sleep module and the Critical Points algorithm.
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McCall, Daryl Lynn. "Investigation through simulation techniques of the application of differential GPS to civil aviation." Ohio : Ohio University, 1985. http://www.ohiolink.edu/etd/view.cgi?ohiou1184013759.
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Braasch, Michael S. "On the characterization of multipath errors in satellite-based precision approach and landing systems." Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1173748635.
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Couronneau, Nicolas. "Performance analysis of assisted-GNSS receivers." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/254273.
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The goal of this thesis is to improve the understanding of the performance of Global Navigation Satellite System (GNSS) receivers that use assistance data provided by cellular networks. A typical example of such a receiver is a mobile phone including a Global Positioning System (GPS) receiver. Using assistance data such as an accurate estimate of the GPS system time is known to improve the availability and the time-tofirst- fix performance of a GNSS receiver. However, the performance depends on the architecture of the cellular network and may vary significantly across networks. This thesis presents three new contributions to the performance analysis of assisted-GNSS receivers in cellular networks. I first introduce a mathematical framework that can be used to calculate a theoretical lower bound of the time-to-first-fix (TTFF) in an assisted-GNSS receiver. Existing methods, for example the flow-graph method, generally focus on calculating the theoretical mean acquisition time of a pseudo-noise signal for one satellite only. I extend these methods to calculate the full probability distribution of the joint acquisition of several satellites, as well as the sequential acquisition of satellites, which is commonly performed in assisted receivers. The method is applied to real measurements made in a multipath fading channel. I next consider time assistance in unsynchronised cellular networks. It is often argued that unsynchronised networks can not provide fine-time aiding since they do not have a common clock, although few experimental results have been reported in the existing literature. I carried out experiments on a GSM network, a second-generation cellular network, in Cambridge, UK, in order to measure the time stability of the synchronisation signals. The results showed a large variability in the time stabilities across different base stations and I evaluated the performance of an ensemble filter that combines the measurements into a single, more accurate, estimate of the universal time. The main contribution is to show that the performance of such a filter is adequate to provide fine-time assistance to a satellite navigation receiver. Finally, I address the positioning performance of an assisted receiver in synchronised cellular networks. Cellular positioning has been often investigated in the literature, but few results on real networks have been presented. Many positioning methods are proprietary and little information about their performance in real networks haven been published publicly. A CDMA2000 cellular network in Calgary, Canada, was used to collect experimental data. The time stability and the synchronisation of the CDMA2000 pilot signals were excellent and were used to evaluate the performance of CDMA2000-based cellular positioning system. I then developed a method to combine the pseudo-range measurements from the GPS signals and the CDMA2000 base stations. I evaluated the performance of positioning in both outdoor and indoor environments, and I analysed the effects and the possible mitigation of non-line-of-sight signals. The main contribution is to show that additional satellite navigation signals can improve the accuracy of cellular positioning beyond what is theoretically expected from the improvement in the geometry.
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Фролова, І. С. "Коли карта не в силах допомогти, є сигнал GPS." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/14005.
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Dainty, Benjamin G. "Use of two-way time transfer measurements to improve geostationary satellite navigation :." Ft. Belvoir Defense Technical Information Center, 2007. http://handle.dtic.mil/100.2/ADA472457.
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Wellons, William Lee. "A shipboard global positioning system carrier phase interferometric aircraft flight reference system." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1179860957.
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Huang, Jidong. "A HIGH-INTEGRITY CARRIER PHASE BATCH PROCESSOR FOR DIFFERENTIAL SATELLITE POSITIONING." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1196143814.
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Bedada, Tullu Besha. "Absolute geopotential height system for Ethiopia." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4726.
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This study used airborne gravity data, the 2008 Earth Gravity Model (EGM08) and Shuttle Radar Topographic Mission (SRTM) digital elevation data in a ‘Remove-Compute-Restore’ process to determine absolute vertical reference system for Ethiopia. This gives a geopotential height at any isolated field point where there is a Global Navigation Satellite System (GNSS) measurement without reference to a vertical network or a regional datum point. Previously, height was determined conventionally by connecting the desired field point physically to a nearby bench mark of a vertical network using co-located measurements of gravity and spirit levelling. With the use of precise GNSS positioning and a gravity model this method becomes obsolesce. The new approach uses the ‘Remove-Restore’ process to eliminate longer to shorter wavelengths from the measured gravity data using EGM08 and geometrical and condensed gravity models of the SRTM data. This provides small, smooth and localised residuals so that the interpolation and integration involved is reliable and the Stokes-like integral can be legitimately restricted to a spherical cap. A very fast, stable and accurate computational algorithm has been formulated by combining ‘hedgehog’ and ‘multipoint’ models in order to make tractable an unavoidably huge computational task required to remove the effects of about 1.5 billion! SRTM topographic mass elements representing Ethiopia and its immediate surroundings at 92433 point airborne gravity observations. The compute stage first uses an iterative Fast Fourier Transform (FFT) to predict residual gravity at aircraft height as a regular grid on to the surface of the ellipsoidal Earth and then it used a Fourier operation equivalent to Stokes’ integral to transform the localised gravity disturbance to residual potential. The restore process determines the geopotential number on or above the Earth’s surface where practitioners need it by restoring the potential effects of the removed masses. The accuracy of the geopotential number computed from gravity and topography was evaluated by comparing it with the one derived directly from EGM08 and precise geodetic levelling. The new model is in a good agreement across 100 km baseline with a standard deviation of 56 10−2 2 −2 × m s and 39 10−2 2 −2 × m s relative to EGM08 and levelling, respectively ( 10−2 2 −2 m s is approximately equivalent to 1mm of height). The new method provides an absolute geopotential height of a point on or above the Earth’s surface in a global sense by interpolating from geopotential models prepared as the digital grids carried in a chip for use with the GNSS receiver in the field.
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Casadei, Alessandro. "An optical navigation filter simulator for a CubeSat mission to Didymos binary asteroid system." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17998/.
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AIDA (Asteroid Impact and Deflection Assessment), is a joint NASA-ESA mission that will operate within 65803 Didymos binary system and whose main purpose is to experiment and investigate the kinetic impact technique for the deviation of the asteroid trajectories in space.
HERA, the "mother" satellite designed by ESA, will aim to collect data about the chemical-physical composition of the binary system and about the characteristics of the impact between DART, the bullet-satellite realized and run by NASA, and the minor of the two celestial bodies that compose Didymos, which should occur around October 2022. HERA satellite will carry high-level technology onboard, including some CubeSats.
This panorama also includes the DustCube mission, a project proposal for a CubeSat, whose main objective is to assist HERA in the acquisition of data.
This thesis, as part of the DustCube project, aims at investigating the autonomous navigation of the CubeSat within the Didymos system, in particular through the development of a navigation filter based on optical observables. By making use of images gathered by a couple of infrared cameras, both LoS and range measurements are retrieved and fed to an Extended Kalman Filter.
Results show that, even if implementing a reduced dynamical model within the filter, the expected position accuracy is below the requested 10 meters.
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Katragadda, Mahesh. "Design and Simulation of a Planar Crossed-Dipole Global Navigation Satellite System (GNSS) Antenna in the L1 Frequency Band." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1345227397.
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Havlík, Martin. "Využití satelitních navigačních systémů v dopravě." Master's thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-5049.
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The work focuses on the application of satellite navigation systems in the different transport fields. It describes the general principle of operation of navigation systems, as well as its history and development. The following section describes the current navigation systems, the principle of operation, architecture and services. A separate chapter is devoted to being the European Galileo system and its services. Practical work deals with the applications according to the navigation systems across different transport sectors. In addition to the transport sector are given applications in other areas of human activity. The main part is devoted to the application in the monitoring and management of the company's fleet. Part of the analysis is the calculation of the efficiency of this investment.
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Silva, Denis Vinicius Ricardo da. "Determinação de um modelo geoidal local para o Distrito Federal." reponame:Repositório Institucional da UnB, 2017. http://repositorio.unb.br/handle/10482/30984.
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Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geociências Aplicadas, 2017.Submitted by Raquel Almeida (raquel.df13@gmail.com) on 2017-11-20T16:13:23Z No. of bitstreams: 1 2017_DenisViniciusRicardodaSilva.pdf: 3726942 bytes, checksum: 9a7076dc55d9f42c5868d0539bdb17ec (MD5)
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O modelo geoidal é parte fundamental na transformação entre as altitudes ortométricas e geométricas. Existem aspectos positivos na sua utilização quando comparados a métodos clássicos de levantamento. O surgimento das técnicas de posicionamento por GNSS (Global Navigation Satellite System) impulsionou de maneira significativa diversas linhas de pesquisa, na busca de um modelo geoidal cada vez mais preciso. A disponibilidade de dados altimétricos, gravimetria terrestre e orbital também contribuíram neste sentido. Deste então, várias abordagens para a obtenção de um modelo geoidal tem sido apresentadas. Atualmente a integração de diferentes métodos se mostra uma alternativa promissora para o cálculo do geoide. Neste contexto, o emprego da técnica Remove-Calcula-Restaura (RCR) tem demonstrado resultados importantes no Brasil e em outras partes do mundo. A base de todas as formulações da técnica RCR envolve métodos gravimétrico e orbital, por isto, utiliza Modelos Digitais de Terreno (MDT), dados gravimétricos terrestres, Modelos do Geopotencial Global (MGG) e valor de densidade para o cálculo de modelos geoidais. Neste trabalho é apresentado um levantamento das diferentes formulações utilizadas no processo de redução gravimétrica. Também uma análise das principais variáveis que possam influenciar no cálculo das anomalias gravimétricas e na elaboração de modelos geoidais, a partir da técnica RCR. Para o cálculo, utilizou-se um pacote denominado GRAVTool, baseado no software MATLAB®. No final da pesquisa, tem-se também, como marco, a determinação de um modelo geoidal local para o Distrito Federal.
The geoidal model is a fundamental part of the transformation between orthometric and geometric heights. There are positive aspects in its use when compared to classical survey methods. The emergence of GNSS (Global Navigation Satellite System) positioning techniques has significantly boosted several lines of research in the search for an increasingly accurate geoidal model. The availability of altimetric data, terrestrial and orbital gravimetry also contributed in this sense. From this, several approaches to obtaining a geoid model have been presented. Currently the integration of different methods shows a promising alternative for the calculation of the geoid. In this context, the use of the Remove-Compute-Restore technique (RCR) has shown important results in Brazil and in other parts of the world. The basis of all RCR technique formulations is derived from gravimetric and orbital methods, using Digital Terrain Models (DTM), terrestrial gravimetric data, Global Geopotential Models (GGM) and density value for the calculation of geoid models. This work presents a revision of the different formulations used in the gravimetric reduction process. Also an analysis of the main variables that can influence the calculation of the gravimetric anomalies and the elaboration of geoid models from the RCR technique. For the calculation, a package called GRAVTool, based on the MATLAB® software, is used. At the end of the research, we also have as a landmark, the determination of a local geoidal model for the Brazilian Federal District.
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Bommakanti, Hemanth Ram Kartik. "Impact of Time Synchronization Accuracy in Integrated Navigation Systems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260239.
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Global Navigation Satellite System/Inertial Measurement Unit (GNSS/IMU) Integrated Navigation Systems (INS) integrate the positive features of GNSS and IMU for optimal navigation guidance in high accuracy outdoor navigation systems, for example using Extended Kalman Filter (EKF) techniques. Time synchronization of IMU data with precise GNSS based time is necessary to accurately synchronize the two systems. This must be done in real-time for time sensitive navigation applications such as autonomous vehicles. The research is done in two parts. The first part is the simulation of inaccurate time-stamping in a single axis of nonlinear input data in a gyroscope and an accelerometer, to obtain the timing error value that is tolerable by a high accuracy GNSS/INS system. The second part is the creation of a real-time algorithm using an STM32 embedded system enabled with FreeRTOS real-time kernel for a GNSS receiver and antenna, along with an IMU sensor. A comparative analysis of the time synchronized system and an unsynchronized system is done based on the errors produced using gyroscope and accelerometer readings along a single axis from the IMU sensor, by conducting static and rotational tests on a revolving chair.The simulation concludes that a high accuracy GNSS/INS system can tolerate a timing error of up to 1 millisecond. The real-time solution provides IMU data paired with updated GNSS based time-stamps every 5 milliseconds. The timing jitter is reduced to a range of ±1 millisecond. Analysis of final angular rotation error and final position error from gyroscope and accelerometer readings respectively, indicate that the real-time algorithm produces a reduction in errors when the system is static, but there is no statistical evidence showing the reduction of errors from the results of the rotational tests.GNSS / IMU integrerade navigationssystem kombinerar de positiva egenskaperna hos GNSS och IMU för optimal prestanda i noggranna navigationssystem. Detta görs med hjälp av sensorfusion, till exempel EKF. Tidssynkronisering av IMU-data med exakt GNSS-baserad tid är nödvändigt för att noggrant synkronisera de två systemen. Detta måste göras i realtid för tidskänsliga navigationsapplikationer såsom autonoma fordon. Forskningen görs i två delar. Den första delen är simulering av icke-linjär rörelse i en axel med felaktig tidsstämpling hos ett gyroskop och en accelerometer. Detta görs för att erhålla det högsta tidsfel som är acceptabelt hos ett GNSS / INS-system med hög noggrannhet. Den andra delen är skapandet av en realtidsalgoritm med ett inbyggt STM32-system med FreeRTOS som realtidskärna för en GNSSmottagare och antenn, tillsammans med en IMU-sensor. En jämförande analys av det tidssynkroniserade systemet mot ett osynkroniserat system görs baserat på de positionsfel längs en axel som produceras av gyroskopoch accelerometermätningar. Detta görs genom att utföra statiska och roterande tester med hjälp av en roterande stol.Simuleringen visar att ett noggrant GNSS / INS-system tolererar ett tidsfel på upp till 1 millisekund. Realtidslösningen ger IMU-data med tidsstämplar synkroniserade med GNSS-tid var femte millisekund. Tidsjittret reduceras till ett intervall mellan ± 1 millisekund. Analysen av det slutliga vinkelrotationsfelet och positionsfelet från gyroskopoch accelerometermätningar indikerar att realtidsalgoritmen ger ett lägre fel när systemet är statiskt. Det finns dock inga statistiska bevis för förbättringen från resultaten av rotationstesterna.
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Appleget, Andrew L. "A Consolidated Global Navigation Satellite System Multipath Analysis Considering Modern Signals, Antenna Installation, and Boundary Conditions for Ground-Based Applications." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1593112317616893.
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Куценко, Олександр Вікторович, and Oleksandr V. Kutsenko. "Методи диференційної навігації повітряних суден за сигналами глобальних навігаційних супутникових систем." Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/52287.
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Дисертаційна робота присвячена вирішенню актуальної науково-технічної задачі розробки методів диференційної навігації повітряних суден за сигналами глобальних навігаційних супутникових систем, що має важливе значення для підвищення безпеки польотів.
Метою дисертаційної роботи є розробка і експериментальне дослідження нових і удосконалених методів диференційної навігації повітряних суден за сигналами multi-GNSS, при виконанні операцій: маневру в зоні аеродрому, здійснення заходу на посадку з вертикальним скеровуванням і по категорії.
В дисертаційній роботі проведений аналіз документів провідних організацій та наукових публікацій в авіаційній і космічній галузях. За цими даними можна стверджувати, що авіаційний транспорт відіграє провідну роль у забезпеченні стійкості економічного та соціального розвитку. Ключовим елементом, який забезпечує ефективність і надійність експлуатації авіаційного транспорту є аеронавігаційне забезпечення, зокрема його радіонавігаційна складова. Особливе значення приділяється розробці супутникових систем посадки. Розглянута прийнята ICAO класифікація заходів на посадку, і проведений аналіз існуючих категорійних систем посадки за приладами. Наданий опис вимог які висуваються до супутникової системи посадки.Аналіз показав, що актуальною науковою задачею є розробка методів диференційної навігації повітряних суден за сигналами глобальних навігаційних супутникових систем, що має важливе значення для підвищення безпеки польотів.
В дисертаційній роботі розглянутий фінальний сегмент заходу на посадку та локальна топоцентрична Декартова система координат XYV пов’язана з злітно-посадковою смугою. Розглянуто похибки які виникають в системі посадки за приладами по сигналам кількох навігаційних супутникових систем. Представлено існуючі і розроблені моделі які дозволяють зменшити вплив даних похибок. Зокрема розроблену модель залишкової тропосферної затримки після здійснення диференційної корекції псевдовідстані ключовою особливістю якої є можливість застосування за відсутності метеорологічних даних. Надана модель корекції псевдовідстані і псевдошвиткості які розраховуються за даними отриманими з кількох наземних навігаційних приймачів, з метою передачі в бортову підсистему системи посадки.
В дисертаційній роботі представлені існуючі і розроблені методи виявлення збоїв в наземній підсистемі системи посадки, визначення вкладу наземної підсистеми в похибку скоректованої псевдовідстані, оцінювання точності і цілісності визначення координат, в кінематичному режимі для різних комбінацій супутникових систем.В дисертаційній роботі описаний розроблений апаратно-програмний комплекс що реалізує створені методи і моделі і дозволяє в умовах напівнатурного моделювання досліджувати точність та цілісність навігаційного рішення при виконанні запланованої операції: маневру в зоні аеродрому, здійснення за-ходу на посадку з вертикальним скеровуванням і по категорії з використанням різних комбінацій сигналів супутникових систем: GPS, GLONASS, GALILEO і BeiDou.
Надані результати льотних випробувань розробленого апаратно-програмного комплексу. Експериментальний політ являв собою відпрацювання лінійної траєкторії, що імітує фінальну ділянку заходу на посадку і проліт над злітно посадковою смугою.
За результатами випробувань отримані такі дані: оцінка вкладу наземної підсистеми в похибку визначення псевдовідстані протягом проведення експерименту; для супутникової навігаційної системи при виконанні запланованої операції: маневру в зоні аеродрому, здійснення за-ходу на посадку з вертикальним скеровуванням і по категорії з використанням різних комбінацій сигналів супутникових систем: GPS, GLONASS, GALILEO і BeiDou отримані еліпсоїди похибок навігаційної системи та, відсоток хибної дієздатності та хибної недієздатності системи.The dissertation is devoted to the solution of the actual scientific and technical problem: aircraft differential navigation methods development with the use of global navigation satellite systems signals. That is important for increasing the safety of flights. The aim of the dissertation is the develop and experimentally study new and improved methods of aircraft differential navigation with the use multi-GNSS signals for performing operations: a maneuver in the aerodrome area, landing approach with vertical guidance and categorical. The dissertation analyzes the documents of leading organizations and scientific publications in the aviation and space industries. According to these data, it can be argued that air transport plays a leading role in ensuring the sustainability of economic and social development. A key element that ensures the efficiency and reliability of air transport operations is air navigation support, in particular its radio navigation component. Special attention is paid to the development of satellite landing systems. The ICAO classification of landing approaches is considered, and the analysis of existing categorical systems of instrumental landing is presented. A requirements description for the satellite landing system is provided. The analysis showed that the actual scientific task is aircraft differential navigation methods development with the use of global navigation satellite systems signals, which is important for improving flight safety. In the dissertation, the final approach segment and the local Cartesian coordinate system XYV connected with the runway are considered. The errors arising in the instrumental aircraft landing system with the use of several satellite systems signals are considered. Presented existing and developed models that reduce the impact of these errors. In particular, the developed model of residual tropospheric delay after the differential correction of the pseudorange. A key feature of which is the possibility of application in case of meteorological data absence. Given a model of pseudorange and pseudorate correction witch calculated from data obtained from several ground-based receivers, and transmit to the landing system onboard subsystem.The dissertation presents existing and developed methods for detecting failures in the landing system ground subsystem, determining the contribution of the ground subsystem to the error of the corrected pseudorange, estimating the accuracy and integrity of coordinate determination in a kinematic mode for different combinations of satellite systems. The dissertation describes the developed hardware and software complex that implements created methods and models and allows navigation solution accuracy and integrity hardware in the loop simulation research, for performing operations: a maneuver in the aerodrome area, landing approach with vertical guidance and categorical, using different signals combinations from satellite systems: GPS, GLONASS, GALILEO and BeiDou. Presented flight test results of the developed hardware and software complex. The experimental flight has a linear trajectory that simulates the landing final approach segment and the flight over the runway. According to the test results, the following data were obtained: ground subsystem contribution estimation to the pseudorange error during the experiment; for satellite navigation system during the planned operation: maneuver in the aerodrome area, landing approach with vertical guidance and categorical using different signals combinations from satellite systems: GPS, GLONASS, GALILEO and BeiDou, navigation system error ellipsoids and the percentage false system capacity and false system incapacity were obtained.
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Smith, Andrew M. "Global navigation satellite system (GNSS) signal simulator : an analysis of the effects of the local environment and atmosphere on receiver positioning." Thesis, University of Bath, 2007. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512261.
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Global Navigation Satellite Systems can provide position, velocity and time information to users using receiver hardware. The United States developed Global Positioning System (GPS) is the only current fully operational system; however further systems are in development. The GPS has shown considerable success for navigation, but it still has a number of problems that limit its accuracy. The two main problems are the ionosphere and local environment of the receiver. The ionosphere causes a delay and random rapid shifts in phase and amplitude (scintillation) to the signal. The local environment can provide the signal with multiple routes (multi-path) to the receiver. In this project a GPS signal simulator is developed, which models the effects of the ionosphere and multi-path on the modulated signals. The focus is made on the GPS system as the simulator measurements can be compared to the real measurements; however other systems will be considered in the future. A number of experiments investigating multi-path and ionospheric effects on a receiver’s ability to track the signals have been completed. The simulator has been used to replicate a real local multi-path environment and the results have been compared. Further investigations of the multi-path have shown a unique multi-path signature in the receiver power output. The later part of the thesis describes a case study investigating a short but rapid period of scintillation observed on three receivers based in Norway. An analysis of the multi-path environment was completed, but was found not to be the cause. The ionosphere was investigated using equipment based across Scandinavia. The equipment showed that geomagnetic conditions were disturbed at the time of the event. The GPS measurements were compared with all-sky camera data to show that the scintillation can be attributed to the GPS signal path crossing electron density structures associated with the aurora.
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Dal, Poz William Rodrigo [UNESP]. "Investigações preliminares sobre a influência do clima espacial no posicionamento relativo com GNSS." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/100251.
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O erro devido à ionosfera nas observáveis GNSS (Global Navigation Satellite System) é diretamente proporcional à densidade de elétrons presente na ionosfera e inversamente proporcional a frequência do sinal. Da mesma forma que no posicionamento por ponto, os resultados obtidos no posicionamento relativo são afetados pelo efeito sistemático da ionosfera, que é uma das maiores fontes de erro no posicionamento com GNSS. Mesmo considerando que parte dos erros devido à ionosfera é cancelada na dupla diferenciação, a ionosfera pode causar fortes impactos no posicionamento relativo. O problema principal neste método de posicionamento é a variação espacial na densidade de elétrons, que pode ocorrer em função de vários fatores, tais como hora local, variação sazonal, localização do usuário, ciclo solar e atividade geomagnética. Dependendo das condições do clima espacial, que é controlado pelo Sol, a atividade geomagnética pode ser alterada de forma significativa, dando origem a uma tempestade geomagnética. Nesta pesquisa foram avaliados os efeitos da ionosfera no posicionamento relativo, com observações GNSS da fase da onda portadora (L1), nas regiões ionosféricas de latitude média e alta e na região equatorial. Nas duas primeiras regiões foram analisados os efeitos da ionosfera em períodos de irregularidades, decorrentes de tempestades geomagnéticas. Na região equatorial, que engloba o Brasil, foram analisados os efeitos da ionosfera em função da variação diária e sazonal. No processamento dos dados GNSS foi utilizado o GPSeq, que processa os dados na forma recursiva e fornece os Resíduos Preditos da Dupla Diferença da Fase (RPDDF)...
The error caused by ionosphere on GNSS (Global Navigation Satellite System) is directly proportional to the density of electrons from ionosphere and inversely proportional to the frequency squared of the signal GNSS. As in the case of point positioning, results in relative positioning are affected by systematic effect from ionosphere, which is one of major error sources in the GNSS positioning. Although some errors caused by ionosphere are canceled in double difference, strong impacts may be caused by ionosphere on the relative positioning. In this positioning the main problem is the spatial variation in electron density that can occur due local time, seasonal variation, user location, solar cycle, geomagnetic activity, etc. Depending on the conditions of space weather, in which is controlled by the Sun, the geomagnetic activity can be changed inducing geomagnetic storms. In this research the effects from ionosphere has been evaluated in GNSS relative positioning using L1 carrier phase observations, at the three regions of the ionosphere: middle and high latitudes and equatorial region. In regions of middle and high latitudes have been analyzed the effects from ionosphere in irregularities periods, caused by geomagnetic storms. In the equatorial region, including Brazil, have been analyzed the effects from ionosphere according daily and seasonal variation. In the processing GNSS data has been used GPSeq software. This software processes the data in a recursive form and provides the Predicted Residual of Carrier Phase Double Difference (PRCPDD) ... (Complete abstract click electronic access below)
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Antoš, Vladimír. "Využití satelitních navigačních systémů v železniční dopravě." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-71728.
Full textAbstract:
The aim of this thesis is to determine the feasibility and benefits of potential use of satellite navigation in rail transport. The theoretical part focuses on the operation of satellite navigation and a description of important systems. The practical part deals with the use in rail transport. Analysis of telematics and fleet management shows one direction of use. Furthermore, there is analyzing of the projects and their value added and usability in practice. Thesis provides a description of the situation and opinion on future use of satellite systems.
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Darmovzal, Pavel. "Využití globálních družicových polohových systémů při mezinárodních přepravách nebezpečných věcí." Master's thesis, Vysoká škola ekonomická v Praze, 2017. http://www.nusl.cz/ntk/nusl-359331.
Full textAbstract:
The master thesis The usage of Global Navigation Satellite Systems in the transnational transport of dangerous goods examines the possibilities of space-based radio-navigation systems in the transport sector, specifically in the carriage of hazardous materials. The author puts an emphasis on identifying the economic and other benefits, as well as the downsides from the key users perspective, which is accomplished by means of interaction with said stakeholders. The dissertations final part aims to point to the factors decisive in the future development with regard to societal needs on both national and European Union levels.