subject:(Global Navigation Satellite System)

Ryerson University

1. Afifi, Akram. An improved precise point positioning model using GPS and Galileo observations.

Degree: 2015, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A4142

► Precise point positioning (PPP) allows for centimeter- to decimeter-level positioning accuracy using a single global navigation satellite system (GNSS) receiver. However, the use of PPP… (more)

▼ Precise point positioning (PPP) allows for centimeter- to decimeter-level positioning accuracy using a single global navigation satellite system (GNSS) receiver. However, the use of PPP is presently limited due to the time required for the solution to converge or re-converge to the expected accuracy, which typically requires about 30 minutes. This relatively long convergence time is essentially caused by the existing un-modeled GNSS residual errors. Additionally, in urban areas, the number of visible satellites is usually limited when a single satellite constellation is used, which in turn slows down the PPP solution convergence. This, however, can be overcome by combining the observations of two constellations, namely the GPS and Galileo systems. Unfortunately, combining the GPS and Galileo constellations, although enhances the satellite geometry, introduces additional biases that must be considered in the observation mathematical models. These include the GPS-to-Galileo time offset, and Galileo satellite and receiver hardware delays. In addition, the stochastic characteristics of the new Galileo E1 and E5a signals must be determined to a high degree of precision. This can be done by analyzing various sets of GPS and Galileo measurements collected at two stations with short separation. Several PPP models are developed in this dissertation, which combine GPS and Galileo observations in the un-differenced and between-satellite single-difference (BSSD) modes. These include the traditional un-differenced model, the decoupled clock model, the semi-decoupled clock model, and the between-satellite single-difference model. It is shown that the traditional un-differenced GPS/Galileo PPP model, the GPS decoupled clock model, and semi-decoupled clock GPS/Galileo PPP model improve the convergence time by about 25% in comparison with the un-differenced GPS-only PPP model. In addition, the semi-decoupled GPS/Galileo PPP model improves the solution precision by about 25% compared to the traditional un-differenced GPS/Galileo PPP model. Moreover, the BSSD GPS/Galileo PPP model improves the solution convergence time by about 50%, in comparison with the un-differenced GPS PPP model, regardless of the type of BSSD combination used. As well, the BSSD model improves the solution precision by about 50% and 25% when the BSSD loose and tight combinations are used, respectively, in comparison with the un-differenced GPS-only model. Advisors/Committee Members: El-Rabbany, Ahmed (Degree supervisor).

Subjects/Keywords: Galileo satellite navigation system.; Global Positioning System.; Artificial satellites in navigation.

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APA (6^th Edition):

Afifi, A. (2015). An improved precise point positioning model using GPS and Galileo observations. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A4142

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Afifi, Akram. “An improved precise point positioning model using GPS and Galileo observations.” 2015. Thesis, Ryerson University. Accessed April 23, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A4142.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Afifi, Akram. “An improved precise point positioning model using GPS and Galileo observations.” 2015. Web. 23 Apr 2021.

Vancouver:

Afifi A. An improved precise point positioning model using GPS and Galileo observations. [Internet] [Thesis]. Ryerson University; 2015. [cited 2021 Apr 23]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A4142.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Afifi A. An improved precise point positioning model using GPS and Galileo observations. [Thesis]. Ryerson University; 2015. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A4142

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

2. Couronneau, Nicolas. Performance analysis of assisted-GNSS receivers.

Degree: PhD, 2013, University of Cambridge

URL: https://doi.org/10.17863/CAM.16638 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608176

► 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… (more)

▼ 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…

Subjects/Keywords: 530; Physics; GNSS; Global Navigation Satellite System; cellular networks

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APA (6^th Edition):

Couronneau, N. (2013). Performance analysis of assisted-GNSS receivers. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.16638 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608176

Chicago Manual of Style (16^th Edition):

Couronneau, Nicolas. “Performance analysis of assisted-GNSS receivers.” 2013. Doctoral Dissertation, University of Cambridge. Accessed April 23, 2021. https://doi.org/10.17863/CAM.16638 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608176.

MLA Handbook (7^th Edition):

Couronneau, Nicolas. “Performance analysis of assisted-GNSS receivers.” 2013. Web. 23 Apr 2021.

Vancouver:

Couronneau N. Performance analysis of assisted-GNSS receivers. [Internet] [Doctoral dissertation]. University of Cambridge; 2013. [cited 2021 Apr 23]. Available from: https://doi.org/10.17863/CAM.16638 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608176.

Council of Science Editors:

Couronneau N. Performance analysis of assisted-GNSS receivers. [Doctoral Dissertation]. University of Cambridge; 2013. Available from: https://doi.org/10.17863/CAM.16638 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608176

3. Donnelly, Robert F. International Competition for Satellite-Based Navigation System Services.

Degree: PhD, International Studies, 2012, Old Dominion University

URL: 9781267890429 ; https://digitalcommons.odu.edu/gpis_etds/42

► The goal of this work is to review the current state of Global Navigation Satellite System (GNSS) development and its potential impact on the… (more)

Subjects/Keywords: GPS; Global navigation Satellite system; International competition; International Relations

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APA (6^th Edition):

Donnelly, R. F. (2012). International Competition for Satellite-Based Navigation System Services. (Doctoral Dissertation). Old Dominion University. Retrieved from 9781267890429 ; https://digitalcommons.odu.edu/gpis_etds/42

Chicago Manual of Style (16^th Edition):

Donnelly, Robert F. “International Competition for Satellite-Based Navigation System Services.” 2012. Doctoral Dissertation, Old Dominion University. Accessed April 23, 2021. 9781267890429 ; https://digitalcommons.odu.edu/gpis_etds/42.

MLA Handbook (7^th Edition):

Donnelly, Robert F. “International Competition for Satellite-Based Navigation System Services.” 2012. Web. 23 Apr 2021.

Vancouver:

Donnelly RF. International Competition for Satellite-Based Navigation System Services. [Internet] [Doctoral dissertation]. Old Dominion University; 2012. [cited 2021 Apr 23]. Available from: 9781267890429 ; https://digitalcommons.odu.edu/gpis_etds/42.

Council of Science Editors:

Donnelly RF. International Competition for Satellite-Based Navigation System Services. [Doctoral Dissertation]. Old Dominion University; 2012. Available from: 9781267890429 ; https://digitalcommons.odu.edu/gpis_etds/42

4. Silva, Denis Vinicius Ricardo da. Determinação de um modelo geoidal local para o Distrito Federal.

Degree: 2017, Brazil

URL: 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.

O modelo geoidal é parte fundamental na transformação entre as altitudes… (more)

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Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geociências Aplicadas, 2017.

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…

Advisors/Committee Members: Marotta, Giuliano Sant'Anna.

Subjects/Keywords: Gravimetria; Modelo Digital de Terreno (MDT); Densidade; Global Navigation Satellite System

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APA (6^th Edition):

Silva, D. V. R. d. (2017). Determinação de um modelo geoidal local para o Distrito Federal. (Masters Thesis). Brazil. Retrieved from http://repositorio.unb.br/handle/10482/30984

Chicago Manual of Style (16^th Edition):

Silva, Denis Vinicius Ricardo da. “Determinação de um modelo geoidal local para o Distrito Federal.” 2017. Masters Thesis, Brazil. Accessed April 23, 2021. http://repositorio.unb.br/handle/10482/30984.

MLA Handbook (7^th Edition):

Silva, Denis Vinicius Ricardo da. “Determinação de um modelo geoidal local para o Distrito Federal.” 2017. Web. 23 Apr 2021.

Vancouver:

Silva DVRd. Determinação de um modelo geoidal local para o Distrito Federal. [Internet] [Masters thesis]. Brazil; 2017. [cited 2021 Apr 23]. Available from: http://repositorio.unb.br/handle/10482/30984.

Council of Science Editors:

Silva DVRd. Determinação de um modelo geoidal local para o Distrito Federal. [Masters Thesis]. Brazil; 2017. Available from: http://repositorio.unb.br/handle/10482/30984

University of New South Wales

5. Li, Tao. Integer ambiguity estimation and validation for precise GNSS positioning.

Degree: Civil & Environmental Engineering, 2013, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/52977 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11655/SOURCE01?view=true

► Global Navigation Satellite Systems (GNSSs) have been widely used in surveying, geodesy and navigation as well as other fields. By 2020, there will be four… (more)

▼ Global Navigation Satellite Systems (GNSSs) have been widely used in surveying, geodesy and navigation as well as other fields. By 2020, there will be four constellations for global usage, namely the American Global Positioning System (GPS), Russian GLObal NAvigation Satellite System (GLONASS), European Union Galileo and Chinese BeiDou. The first two constellations possess the full operational capability at the moment and the last two are hopefully to be fully operational by 2020. The Japanese regional Quasi-Zenith Satellite System (QZSS) and Indian Regional Navigation Satellite System (IRNSS) are all under developing. Multi-constellations will benefit global positioning, navigation and timing (PNT) users not only in terms of satellite availability, but also precision, integrity and reliability. However, to achieve centimeter to millimeter-level accuracy, resolving the integer ambiguities in the carrier phase measurements is indispensable. As soon as the integer ambiguities are correctly resolved, the carrier phase measurements begin to measure the distance in centimeter to millimeter-level accuracy.The integer ambiguity resolution and validation have been major issues for high precision GNSS positioning over the past two decades. In general, there are three steps required for reliable integer ambiguity resolution and validation. The first step is to estimate the float solution and its variance-covariance matrix by the standard least-squares, regardless of the integer constraint for the ambiguities. Then, the second step is to resolve the integer ambiguities by the integer least-squares with the float ambiguity vector and the variance-covariance matrix. The last step is to constrain the coordinates with the resolved integer ambiguities to achieve centimeter to millimeter-level accuracy. To ensure the reliability of the resolved integer ambiguities and the position, specific modeling and quality control procedures, especially for the integer ambiguity validation, are indispensable. In this research, modeling and quality control procedures for precise and reliable GNSS positioning have been researched. Most importantly, the challenging integer ambiguity resolution and validation issues have been explicitly investigated for both relative positioning and precise point positioning. The major contributions are specified as follows:a) Mathematical modeling aspects for GPS, GLONASS and QZSS constellation integration are investigated. Numerical and theoretical comparative studies are conducted. The results indicate that the identified model outperforms the other models in terms of high integer ambiguity resolution success-rates.b) Mathematical modeling and quality control aspects for precise point positioning are examined. An improved model for triple-frequency precise point positioning is developed and a new procedure of integer ambiguity resolution and validation in precise point positioning is proposed. Success-rate is introduced as an essential factor to evaluate the integer ambiguity resolution performance. Simulation… Advisors/Committee Members: Wang, Jinling, Civil & Environmental Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Global Navigation Satellite Systems (GNSSs); American Global Positioning System (GPS); Russian GLObal NAvigation Satellite System (GLONASS); European Union Galileo; Chinese BeiDou; Validation; Integer ambiguities; Navigation

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APA (6^th Edition):

Li, T. (2013). Integer ambiguity estimation and validation for precise GNSS positioning. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/52977 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11655/SOURCE01?view=true

Chicago Manual of Style (16^th Edition):

Li, Tao. “Integer ambiguity estimation and validation for precise GNSS positioning.” 2013. Doctoral Dissertation, University of New South Wales. Accessed April 23, 2021. http://handle.unsw.edu.au/1959.4/52977 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11655/SOURCE01?view=true.

MLA Handbook (7^th Edition):

Li, Tao. “Integer ambiguity estimation and validation for precise GNSS positioning.” 2013. Web. 23 Apr 2021.

Vancouver:

Li T. Integer ambiguity estimation and validation for precise GNSS positioning. [Internet] [Doctoral dissertation]. University of New South Wales; 2013. [cited 2021 Apr 23]. Available from: http://handle.unsw.edu.au/1959.4/52977 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11655/SOURCE01?view=true.

Council of Science Editors:

Li T. Integer ambiguity estimation and validation for precise GNSS positioning. [Doctoral Dissertation]. University of New South Wales; 2013. Available from: http://handle.unsw.edu.au/1959.4/52977 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11655/SOURCE01?view=true

University of Minnesota

6. Jackson, John. Real-time Kinematic Positioning: Background, Assessment and Forecasting.

Degree: MS, Aerospace Engineering and Mechanics, 2018, University of Minnesota

URL: http://hdl.handle.net/11299/200136

► This thesis presents an introduction and work performed related to real-time kinematic (RTK) positioning. RTK positioning is a differential positioning method that uses signals from… (more)

Subjects/Keywords: Global Navigation Satellite System (GNSS); Global Positioning System (GPS); Low-Cost RTK; Machine Learning; Navigation; Positioning

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APA (6^th Edition):

Jackson, J. (2018). Real-time Kinematic Positioning: Background, Assessment and Forecasting. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/200136

Chicago Manual of Style (16^th Edition):

Jackson, John. “Real-time Kinematic Positioning: Background, Assessment and Forecasting.” 2018. Masters Thesis, University of Minnesota. Accessed April 23, 2021. http://hdl.handle.net/11299/200136.

MLA Handbook (7^th Edition):

Jackson, John. “Real-time Kinematic Positioning: Background, Assessment and Forecasting.” 2018. Web. 23 Apr 2021.

Vancouver:

Jackson J. Real-time Kinematic Positioning: Background, Assessment and Forecasting. [Internet] [Masters thesis]. University of Minnesota; 2018. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/11299/200136.

Council of Science Editors:

Jackson J. Real-time Kinematic Positioning: Background, Assessment and Forecasting. [Masters Thesis]. University of Minnesota; 2018. Available from: http://hdl.handle.net/11299/200136

Ohio University

7. Li, Jian. Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception.

Degree: MS, Electrical Engineering & Computer Science (Engineering and Technology), 1996, Ohio University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178220159

Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception Advisors/Committee Members: Skidmore, Trent (Advisor).

Subjects/Keywords: Global Navigation Satellite System; Global Positioning System; Global Orbiting Navigation Satellite System

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APA (6^th Edition):

Li, J. (1996). Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178220159

Chicago Manual of Style (16^th Edition):

Li, Jian. “Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception.” 1996. Masters Thesis, Ohio University. Accessed April 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178220159.

MLA Handbook (7^th Edition):

Li, Jian. “Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception.” 1996. Web. 23 Apr 2021.

Vancouver:

Li J. Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception. [Internet] [Masters thesis]. Ohio University; 1996. [cited 2021 Apr 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178220159.

Council of Science Editors:

Li J. Investigating the effect of the DGNSS SCAT-I data link on VOR signal reception. [Masters Thesis]. Ohio University; 1996. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178220159

Indian Institute of Science

8. Joshi, Prachi. Analysis and Detection of Ionospheric Depletions over the Indian Region in the Context of Satellite Navigation.

Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3419

► Satellites have revolutionized navigation by making it more universal, accessible and ac- curate. Global Positioning System (GPS) is the most widely used satellite navigation system… (more)

▼ Satellites have revolutionized navigation by making it more universal, accessible and ac- curate. Global Positioning System (GPS) is the most widely used satellite navigation system in the world. However, it is prone to errors from various sources such as the ionosphere, troposphere and clock biases. In order to make the system very accurate and reliable, especially to meet the requirements of safety-critical applications, Satellite Based Augmentation Systems (SBAS) have recently been designed in various countries to augment the GPS by providing corrections for its errors. An Indian SBAS called GAGAN (GPS Aided Geo Augmented Navigation), developed for the Airports Authority of India (AAI) by Indian Space Research Organization (ISRO) is currently being installed and proven for aviation and other use. The uncertain propagation delay of signals through the ionosphere is the most important contributor of error in GPS positioning, its maximal elimination is a major task of SBAS overlays. Ionospheric delays have steady, cyclic, and irregular components. The last types are of particular concern because they are unpredictable. This thesis deals with ionospheric depletion, an important phenomenon of this class that is specific to tropical regions like India and hence have not been well studied in the context of other SBAS systems of the world which cover mid-latitude domains. Depletion is an ionospheric phenomenon in which the density of electrons dips suddenly and then returns close to the previous value. It poses a challenge to the model adopted for ionospheric delay estimation since it may not be detectable by ground systems be- cause of its localized nature, and its occurrence and intensity cannot be predicted. In this work we have analyzed the depletion characteristics over the Indian region such as its distribution, frequency of occurrence, and depth and duration parameters. We have then studied and implemented an existing algorithm to detect a depletion from the Total Electron Content (TEC) data. This algorithm has been found to be inaccurate for estimation of depletion duration, and we have proposed an improved algorithm for depletion detection and shown it to be more suitable for the Indian SBAS, GAGAN. The algorithm utilizes multiple thresholds for depletion detection in order to improve performance in the presence of irregularities including noise. These thresholds are determined by analyzing real TEC data containing depletion events over the Indian region. The detected depletion events are those that have a strong likelihood of contributing large range errors and degrading GAGAN's reliability. The thresholds include depletion parameters such as the depth, duration, rate of change of TEC, and the rate of change of slope of the TEC curve. The characterization of depletion events over the Indian region yielded useful insights into the behaviour of the phenomenon. It was observed that the depletion events were invariably present post-sunset, between 1900 and 0200 hrs. This observation is consistent with the other… Advisors/Committee Members: Mahapatra, P R (advisor).

Subjects/Keywords: Global Positioning System (GPS); Satellite Based Augmentation System (SBAS); Ionospheric Depletions; Satellite Navigation; Global Navigation Satellite Systems (GNSS); Depletion Detection - Ionosphere; Ionospheric Depletion; GAGAN (GPS Aided Geo Augmentation Navigation); Ionospheric Depletion - Spatial Analysis; Ionosphere; Satellite Navigation; Ionospheric Depletion Detection; Geophysics

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APA (6^th Edition):

Joshi, P. (2018). Analysis and Detection of Ionospheric Depletions over the Indian Region in the Context of Satellite Navigation. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3419

Chicago Manual of Style (16^th Edition):

Joshi, Prachi. “Analysis and Detection of Ionospheric Depletions over the Indian Region in the Context of Satellite Navigation.” 2018. Masters Thesis, Indian Institute of Science. Accessed April 23, 2021. http://etd.iisc.ac.in/handle/2005/3419.

MLA Handbook (7^th Edition):

Joshi, Prachi. “Analysis and Detection of Ionospheric Depletions over the Indian Region in the Context of Satellite Navigation.” 2018. Web. 23 Apr 2021.

Vancouver:

Joshi P. Analysis and Detection of Ionospheric Depletions over the Indian Region in the Context of Satellite Navigation. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Apr 23]. Available from: http://etd.iisc.ac.in/handle/2005/3419.

Council of Science Editors:

Joshi P. Analysis and Detection of Ionospheric Depletions over the Indian Region in the Context of Satellite Navigation. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3419

Ohio University

9. Bhanot, Sunil. Implementation and optimization of a Global Navigation Satellite System software radio.

Degree: MS, Electrical Engineering & Computer Science (Engineering and Technology), 1998, Ohio University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176840392

Implementation and optimization of a Global Navigation Satellite System software radio Advisors/Committee Members: Braasch, Michael (Advisor).

Subjects/Keywords: Global Navigation Satellite System; Global Orbital Navigation Satellite System; Spread Spectrum Signal Acquisition

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APA (6^th Edition):

Bhanot, S. (1998). Implementation and optimization of a Global Navigation Satellite System software radio. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176840392

Chicago Manual of Style (16^th Edition):

Bhanot, Sunil. “Implementation and optimization of a Global Navigation Satellite System software radio.” 1998. Masters Thesis, Ohio University. Accessed April 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176840392.

MLA Handbook (7^th Edition):

Bhanot, Sunil. “Implementation and optimization of a Global Navigation Satellite System software radio.” 1998. Web. 23 Apr 2021.

Vancouver:

Bhanot S. Implementation and optimization of a Global Navigation Satellite System software radio. [Internet] [Masters thesis]. Ohio University; 1998. [cited 2021 Apr 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176840392.

Council of Science Editors:

Bhanot S. Implementation and optimization of a Global Navigation Satellite System software radio. [Masters Thesis]. Ohio University; 1998. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176840392

University of Cambridge

10. Couronneau, Nicolas. Performance analysis of assisted-GNSS receivers.

Degree: PhD, 2013, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/254273https://www.repository.cam.ac.uk/bitstream/1810/254273/3/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/4/Couronneau_2013_PhD-36469.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/6/Couronneau_2013_Agreement.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/5/Couronneau_2013_PhD-36469.pdf.jpg ; https://www.repository.cam.ac.uk/bitstream/1810/254273/7/Couronneau_2013_Agreement.pdf.jpg

► 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… (more)

▼ 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…

Subjects/Keywords: Research Subject Categories::NATURAL SCIENCES::Physics; GNSS; Global Navigation Satellite System; cellular networks

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APA (6^th Edition):

Couronneau, N. (2013). Performance analysis of assisted-GNSS receivers. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/254273https://www.repository.cam.ac.uk/bitstream/1810/254273/3/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/4/Couronneau_2013_PhD-36469.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/6/Couronneau_2013_Agreement.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/5/Couronneau_2013_PhD-36469.pdf.jpg ; https://www.repository.cam.ac.uk/bitstream/1810/254273/7/Couronneau_2013_Agreement.pdf.jpg

Chicago Manual of Style (16^th Edition):

Couronneau, Nicolas. “Performance analysis of assisted-GNSS receivers.” 2013. Doctoral Dissertation, University of Cambridge. Accessed April 23, 2021. https://www.repository.cam.ac.uk/handle/1810/254273https://www.repository.cam.ac.uk/bitstream/1810/254273/3/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/4/Couronneau_2013_PhD-36469.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/6/Couronneau_2013_Agreement.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/5/Couronneau_2013_PhD-36469.pdf.jpg ; https://www.repository.cam.ac.uk/bitstream/1810/254273/7/Couronneau_2013_Agreement.pdf.jpg.

MLA Handbook (7^th Edition):

Couronneau, Nicolas. “Performance analysis of assisted-GNSS receivers.” 2013. Web. 23 Apr 2021.

Vancouver:

Couronneau N. Performance analysis of assisted-GNSS receivers. [Internet] [Doctoral dissertation]. University of Cambridge; 2013. [cited 2021 Apr 23]. Available from: https://www.repository.cam.ac.uk/handle/1810/254273https://www.repository.cam.ac.uk/bitstream/1810/254273/3/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/4/Couronneau_2013_PhD-36469.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/6/Couronneau_2013_Agreement.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/5/Couronneau_2013_PhD-36469.pdf.jpg ; https://www.repository.cam.ac.uk/bitstream/1810/254273/7/Couronneau_2013_Agreement.pdf.jpg.

Council of Science Editors:

Couronneau N. Performance analysis of assisted-GNSS receivers. [Doctoral Dissertation]. University of Cambridge; 2013. Available from: https://www.repository.cam.ac.uk/handle/1810/254273https://www.repository.cam.ac.uk/bitstream/1810/254273/3/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/4/Couronneau_2013_PhD-36469.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/6/Couronneau_2013_Agreement.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/254273/5/Couronneau_2013_PhD-36469.pdf.jpg ; https://www.repository.cam.ac.uk/bitstream/1810/254273/7/Couronneau_2013_Agreement.pdf.jpg

Brno University of Technology

11. Straňák, Filip. Přehled a porovnání principů činnosti současných druhů GNSS ve světě: Survey & comparison of operation principles of the existing GNSS.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/33520

► Purpose of this bachelor thesis is and overview and comparison of current global navigation satelite systems and their contribution to air traffic. Basic principles of… (more)

Subjects/Keywords: globálny navigačný družicový systém; GNSS; letecká doprava; global navigation satellite system; GNSS; air traffic

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APA (6^th Edition):

Straňák, F. (2019). Přehled a porovnání principů činnosti současných druhů GNSS ve světě: Survey & comparison of operation principles of the existing GNSS. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/33520

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Straňák, Filip. “Přehled a porovnání principů činnosti současných druhů GNSS ve světě: Survey & comparison of operation principles of the existing GNSS.” 2019. Thesis, Brno University of Technology. Accessed April 23, 2021. http://hdl.handle.net/11012/33520.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Straňák, Filip. “Přehled a porovnání principů činnosti současných druhů GNSS ve světě: Survey & comparison of operation principles of the existing GNSS.” 2019. Web. 23 Apr 2021.

Vancouver:

Straňák F. Přehled a porovnání principů činnosti současných druhů GNSS ve světě: Survey & comparison of operation principles of the existing GNSS. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/11012/33520.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Straňák F. Přehled a porovnání principů činnosti současných druhů GNSS ve světě: Survey & comparison of operation principles of the existing GNSS. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/33520

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

12. Grinter, Thomas. Precise Point Positioning – The evolution of an alternative GNSS positioning solution.

Degree: Civil & Environmental Engineering, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/60053 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51538/SOURCE02?view=true

► Precise Point Positioning (PPP) employs readily available Global Navigation Satellite System (GNSS) orbit and clock correction products to perform point positioning using a single GNSS… (more)

▼ Precise Point Positioning (PPP) employs readily available Global Navigation Satellite System (GNSS) orbit and clock correction products to perform point positioning using a single GNSS receiver. Over the last 20 years, the New South Wales (NSW) state government has invested in Continuously Operating Reference Station (CORS) infrastructure, currently comprising a 200-station network providing cm-level positioning using differential Network Real-Time Kinematic (NRTK) GNSS techniques to a growing market of commercial users who rely on this service. However, in remote western NSW, it is not economically feasible to maintain the same station density to enable NRTK services. In the last 10 years, developments in PPP, including Real-Time PPP (RT-PPP) and Ambiguity-Resolved PPP (AR-PPP), have allowed PPP to potentially offer a viable alternative to NRTK positioning without the need for such a high station density. This thesis investigates the development of PPP over the last 10 years from a practical perspective and highlights the advantages and disadvantages of this positioning technique. Existing static PPP services are found to be adequate for shortened observation periods. The various methodologies and advances in RT-PPP and AR-PPP services are presented. Three separate case studies using large real-time data-sets found potential for these techniques in remote areas lacking dense CORS network coverage. Multi-constellation GNSS and multi-frequency GNSS showed promise for improving initialisation times for real-time ambiguity resolution techniques, even for single-frequency PPP, which will be important for mass market users in the future. Satellite-based delivery of correction services over NSW was tested using the Japanese QZSS service in an Australian first static and kinematic PPP case study. Despite of all these advances in PPP methodology, this thesis has found that PPP, in the near future, will not be able to replace conventional NRTK, but can offer national or regional positioning solutions at specified accuracies, or as a ‘fill-in’ service for practical use in sparser local/regional CORS networks. Advisors/Committee Members: Roberts, Craig, Civil & Environmental Engineering, Faculty of Engineering, UNSW, Harvey, Bruce, Civil & Environmental Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Real time; Precise Point Positioning (PPP); Ambiguity resolution; CORSnet-NSW; Global Navigation Satellite System (GNSS)

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APA (6^th Edition):

Grinter, T. (2018). Precise Point Positioning – The evolution of an alternative GNSS positioning solution. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60053 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51538/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Grinter, Thomas. “Precise Point Positioning – The evolution of an alternative GNSS positioning solution.” 2018. Masters Thesis, University of New South Wales. Accessed April 23, 2021. http://handle.unsw.edu.au/1959.4/60053 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51538/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Grinter, Thomas. “Precise Point Positioning – The evolution of an alternative GNSS positioning solution.” 2018. Web. 23 Apr 2021.

Vancouver:

Grinter T. Precise Point Positioning – The evolution of an alternative GNSS positioning solution. [Internet] [Masters thesis]. University of New South Wales; 2018. [cited 2021 Apr 23]. Available from: http://handle.unsw.edu.au/1959.4/60053 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51538/SOURCE02?view=true.

Council of Science Editors:

Grinter T. Precise Point Positioning – The evolution of an alternative GNSS positioning solution. [Masters Thesis]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60053 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51538/SOURCE02?view=true

University of Illinois – Urbana-Champaign

13. Kim, Doyoun. Low-cost and flexible USRP based real-time global navigation satellite system receiver for ionospheric sounder.

Degree: MS, Electrical & Computer Engr, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/99264

► Software defined radio (SDR) is a recent development in the wireless communication field that provides re-configurability and flexibility to the RF front end. We present… (more)

Subjects/Keywords: Universal software radio peripheral (USRP); Total electron content (TEC); Global Navigation Satellite System (GNSS); Global Positioning System (GPS); Ionospheric sounder

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APA (6^th Edition):

Kim, D. (2017). Low-cost and flexible USRP based real-time global navigation satellite system receiver for ionospheric sounder. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99264

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kim, Doyoun. “Low-cost and flexible USRP based real-time global navigation satellite system receiver for ionospheric sounder.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed April 23, 2021. http://hdl.handle.net/2142/99264.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kim, Doyoun. “Low-cost and flexible USRP based real-time global navigation satellite system receiver for ionospheric sounder.” 2017. Web. 23 Apr 2021.

Vancouver:

Kim D. Low-cost and flexible USRP based real-time global navigation satellite system receiver for ionospheric sounder. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/2142/99264.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kim D. Low-cost and flexible USRP based real-time global navigation satellite system receiver for ionospheric sounder. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99264

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

14. HASNUR RABIAIN, AZMIR. Performance evaluation of MEMS based INS/GPS integration.

Degree: 2010, University of Melbourne

URL: http://hdl.handle.net/11343/36302

► Continuous positioning and attitude determination are of great interest in many applications such as location based services (LBS) and vehicle navigation systems. Global Navigation Satellite… (more)

▼ Continuous positioning and attitude determination are of great interest in many applications such as location based services (LBS) and vehicle navigation systems. Global Navigation Satellite System (GNSS) is the most widely employed technique where it could provide global positioning solutions, at any given time of day and weather. However, its use is limited particularly in urban canyon environments due to its signals being obstructed by buildings and thick foliages. Therefore, it is often integrated with other positioning systems to overcome the problem. The most common system integrated with GNSS is the Inertial Navigation Systems (INS). However, conventional INS are not practically suitable to be used in most land based or commercial applications primarily due to its cost and size. With the advent of technology, it is possible to mass produce Micro-Electronic- Mechanical-System (MEMS) INS, which is relatively inexpensive and smaller than conventional INS. When integrated with GNSS using the Extended Kalman Filter (EKF) algorithm, it can create a more robust navigation system. This in turn makes it a more practical system to be employed in applications such as LBS. However, MEMS INS/GNSS performance is relatively poor compared to conventional INS/GNSS due to its fabrication process and noisy sensors. Therefore, more research is needed to in- vestigate its capability for applications which require continuous positioning solutions. This research aims to evaluate the performance of INS/GNSS integration. This is achieved by comparing the capabilities of two INS/GNSS integration architectures, namely loosely (LC) and tightly coupled (TC), and through the testing of six MEMS based INS. Firstly, a static test was conducted to obtain INS stochastic coecients using Allan Variance (AV) and Power Spectral Density (PSD) analyses. The results from the analyses allow for a performance comparison of the six INS. Secondly, two independent kinematic tests were conducted to evaluate INS performances when integrated with GPS, using both LC and TC integration architectures. GPS outages were simulated to further investigate the capability of INS/GPS to bridge positioning solution when GPS measurements are unavailable. The result of the research showed that the accuracy of integrated INS/GPS using LC integration architecture was comparative to GPS-Single Point Positioning (SPP) solution whereas, considerable improvements were observed when TC integration architecture was employed. Similar trends were observed during simulated GPS outages, where INS/GPS positional errors were signicantly decreased when using TC compared to LC. Ultimately, the positional growth is dependent on the INS grade, where the results showed that higher grade INS outperformed lower grade INS particularly during simulated GPS outages.

Subjects/Keywords: Inertial Navigation; Global Navigation Satellite System; GPS; Stochastic Modelling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

HASNUR RABIAIN, A. (2010). Performance evaluation of MEMS based INS/GPS integration. (Masters Thesis). University of Melbourne. Retrieved from http://hdl.handle.net/11343/36302

Chicago Manual of Style (16^th Edition):

HASNUR RABIAIN, AZMIR. “Performance evaluation of MEMS based INS/GPS integration.” 2010. Masters Thesis, University of Melbourne. Accessed April 23, 2021. http://hdl.handle.net/11343/36302.

MLA Handbook (7^th Edition):

HASNUR RABIAIN, AZMIR. “Performance evaluation of MEMS based INS/GPS integration.” 2010. Web. 23 Apr 2021.

Vancouver:

HASNUR RABIAIN A. Performance evaluation of MEMS based INS/GPS integration. [Internet] [Masters thesis]. University of Melbourne; 2010. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/11343/36302.

Council of Science Editors:

HASNUR RABIAIN A. Performance evaluation of MEMS based INS/GPS integration. [Masters Thesis]. University of Melbourne; 2010. Available from: http://hdl.handle.net/11343/36302

University of New South Wales

15. Channarayapatna Shivaramaiah, Nagaraj. Enhanced receiver techniques for Galileo E5 AltBOC signal processing.

Degree: Surveying & Spatial Information Systems, 2011, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/50877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9771/SOURCE02?view=true

► In Global Navigation Satellite Systems (GNSS) the structure of the signal predominately determines the system performance and wideband signals, in general, offer good performance. Consequently… (more)

▼ In Global Navigation Satellite Systems (GNSS) the structure of the signal predominately determines the system performance and wideband signals, in general, offer good performance. Consequently signal design and the receiver processing for wideband signals have attracted significant research attention in recent years. The L5/E5 frequency band has been exploited for such high performance wideband signals as a part of the process of GNSS modernisation. Due to their appealing performance, the wideband signals are likely to be used in applications that demand high ranging accuracy. The wideband Alternate Binary-Offset-Carrier (AltBOC) modulation is the most sophisticated among the GNSS signals. The receiver baseband signal processing has to overcome several challenges before maximising the benefits offered by AltBOC modulation in terms of computational complexity, resource utilisation, and power consumption. This dissertation proposes efficient acquisition, tracking and multipath mitigation techniques for the L5/E5 band signals, specifically the AltBOC(15,10). The signal detection probability and mean acquisition time performance of different acquisition strategies for AltBOC(15,10) are analysed and a new acquisition method is proposed to increase the detection probability, reduce the mean acquisition time, and reduce the computational resource requirement. A generalised tracking architecture is described and a hybrid tracking architecture which maximises the received signal energy, and hence the tracking performance is proposed. An innovative Sideband-Carrier-Phase-Combination (SCPC) method is proposed to reduce the pseudorange multipath to less than one metre. Results from simulation as well as real test signals are provided to verify the proposed algorithms. In addition, results from an FPGA-based implementation are provided to validate the complexity reduction and power consumption benefit claims of these new methods.Learning from the drawbacks of the AltBOC modulation as far as the reduction in algorithm simplicity is concerned, this dissertation proposes a new modulation scheme called Time-Multiplexed Offset-Carrier QPSK (TMOC-QPSK) that behaves exactly like an AltBOC, yet is “receiver friendly”. A generalisation of the TMOC-QPSK, referred to as Time-Multiplexed-Multi-Carrier (TMMC) modulation, is presented and its potential in dealing with radio frequency interference and frequency selective propagation delay distortion is discussed.

Subjects/Keywords: Global Navigation Satellite Systems (GNSS); Wideband signals

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APA (6^th Edition):

Channarayapatna Shivaramaiah, N. (2011). Enhanced receiver techniques for Galileo E5 AltBOC signal processing. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/50877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9771/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Channarayapatna Shivaramaiah, Nagaraj. “Enhanced receiver techniques for Galileo E5 AltBOC signal processing.” 2011. Doctoral Dissertation, University of New South Wales. Accessed April 23, 2021. http://handle.unsw.edu.au/1959.4/50877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9771/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Channarayapatna Shivaramaiah, Nagaraj. “Enhanced receiver techniques for Galileo E5 AltBOC signal processing.” 2011. Web. 23 Apr 2021.

Vancouver:

Channarayapatna Shivaramaiah N. Enhanced receiver techniques for Galileo E5 AltBOC signal processing. [Internet] [Doctoral dissertation]. University of New South Wales; 2011. [cited 2021 Apr 23]. Available from: http://handle.unsw.edu.au/1959.4/50877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9771/SOURCE02?view=true.

Council of Science Editors:

Channarayapatna Shivaramaiah N. Enhanced receiver techniques for Galileo E5 AltBOC signal processing. [Doctoral Dissertation]. University of New South Wales; 2011. Available from: http://handle.unsw.edu.au/1959.4/50877 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9771/SOURCE02?view=true

Ohio University

16. Liu, Fan. Analysis of integrity monitoring for the local area augmentation system using the global navigation satellite system.

Degree: PhD, Electrical Engineering & Computer Science (Engineering and Technology), 1998, Ohio University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175192969

► This dissertation addresses the signal-in-space integrity monitoring of the Local Area Augmentation System. The theoretical basis and the system architecture of the integrity monitoring… (more)

Subjects/Keywords: local area augmentation system; global navigation satellite system; algorithms

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APA (6^th Edition):

Liu, F. (1998). Analysis of integrity monitoring for the local area augmentation system using the global navigation satellite system. (Doctoral Dissertation). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175192969

Chicago Manual of Style (16^th Edition):

Liu, Fan. “Analysis of integrity monitoring for the local area augmentation system using the global navigation satellite system.” 1998. Doctoral Dissertation, Ohio University. Accessed April 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175192969.

MLA Handbook (7^th Edition):

Liu, Fan. “Analysis of integrity monitoring for the local area augmentation system using the global navigation satellite system.” 1998. Web. 23 Apr 2021.

Vancouver:

Liu F. Analysis of integrity monitoring for the local area augmentation system using the global navigation satellite system. [Internet] [Doctoral dissertation]. Ohio University; 1998. [cited 2021 Apr 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175192969.

Council of Science Editors:

Liu F. Analysis of integrity monitoring for the local area augmentation system using the global navigation satellite system. [Doctoral Dissertation]. Ohio University; 1998. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1175192969

Brno University of Technology

17. Pospíšil, Václav. Navigační systémy: Navigation Systems.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/192256

► The first part of the thesis is devoted to a comprehensive description and development of global navigation satellite systems, which is followed by the second… (more)

Subjects/Keywords: Globální družicový navigační systém; GPS; GLONASS; Galileo; BeiDou-3; autonavigace; navigační aplikace; Global navigation satellite system; GPS; GLONASS; Galileo; BeiDou-3; car navigation; navigation applications

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pospíšil, V. (2020). Navigační systémy: Navigation Systems. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/192256

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pospíšil, Václav. “Navigační systémy: Navigation Systems.” 2020. Thesis, Brno University of Technology. Accessed April 23, 2021. http://hdl.handle.net/11012/192256.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pospíšil, Václav. “Navigační systémy: Navigation Systems.” 2020. Web. 23 Apr 2021.

Vancouver:

Pospíšil V. Navigační systémy: Navigation Systems. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/11012/192256.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pospíšil V. Navigační systémy: Navigation Systems. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/192256

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

18. Chen, Derek. Graphical SLAM for urban UAV navigation.

Degree: MS, Aerospace Engineering, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/99287

► In recent years, there has been rising interest in commercial applications of Unmanned Air Vehicles (UAVs). Examples of their usage include aerial photography, infrastructure inspection… (more)

▼ In recent years, there has been rising interest in commercial applications of Unmanned Air Vehicles (UAVs). Examples of their usage include aerial photography, infrastructure inspection and emergency first response. For widespread commercial adoption of these applications to occur, UAV navigation must be made safe and reliable. In open-sky environments, Global Positioning System (GPS) receivers are most commonly used to provide accurate and globally referenced positioning for UAVs. However, many applications, such as consumer product delivery, require UAVs to operate in densely populated urban environments. In these environments, buildings and structures reflect and block GPS signals, leading to multipath and low satellite visibility. These factors create GPS-challenged environments that result in large errors in UAV positioning or make GPS unavailable. To improve urban GPS, one approach uses environment modeling such as 3D city models to mitigate the effects of multipath and NLOS errors. Others pair GPS with odometry measurements from relative positioning sensors, such as Light Detection and Ranging (LiDAR) sensors. LiDAR-based odometry provides an accurate relative navigation solution in GPS-challenged environments, but requires distinguishable features in the surrounding environment and is susceptible to drift and biases. As a result, there is a need for sensor fusion techniques that can provide reliable and robust positioning in urban environments. In this thesis, we apply a Simultaneous Localization and Mapping (SLAM) approach to fuse GPS pseudorange measurements with LiDAR point clouds and 3D building footprint data of the existing region, for UAV trajectory estimation and environment mapping. Our approach consists of three main aspects: graphical modeling, map-based processing, and inference. First, we use a probabilistic graph, specifically a directed acyclic graph, to model the trajectory of a UAV. Nodes in the graph represent states of the UAV or GPS satellites; while edges represent relations between states created by sensor measurements. We then use the graph to structure our environment maps. We represent our environment in two mapping formats: a point cloud map and an urban building map. The point cloud map is formulated by anchoring each collected LiDAR point cloud with their respective state. The result is a large point cloud collected throughout the trajectory of the UAV. The urban building map is a geometric representation of the large scale structures in the environment. It is first initialized with available sources of 3D building model data for the navigating region. In this work, we use Champaign building footprint data from the State of Illinois data portal. We then run plane fitting algorithms on the collected point clouds at each state to update the urban building map. As the UAV navigates, the graph is populated by additional nodes and corresponding LiDAR measurements, allowing for SLAM of the environment. Next, we apply the formulated maps in two ways: mitigation of errors… Advisors/Committee Members: Gao, Grace X (advisor).

Subjects/Keywords: Navigation; Global Positioning System (GPS)

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APA (6^th Edition):

Chen, D. (2017). Graphical SLAM for urban UAV navigation. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Derek. “Graphical SLAM for urban UAV navigation.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed April 23, 2021. http://hdl.handle.net/2142/99287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Derek. “Graphical SLAM for urban UAV navigation.” 2017. Web. 23 Apr 2021.

Vancouver:

Chen D. Graphical SLAM for urban UAV navigation. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/2142/99287.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen D. Graphical SLAM for urban UAV navigation. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99287

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Sateesh Kumar Gudla. GPS signal propagation characteristics analysis and development of a new navigation solution for precise navigation applications; -.

Degree: Engineering, 2013, Andhra University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/12748

►

The introduction of Global Positioning System (GPS) has been a major breakthrough especially in the field of navigation. Navigation is the process of directing the… (more)

▼

The introduction of Global Positioning System (GPS) has been a major breakthrough especially in the field of navigation. Navigation is the process of directing the movement of a vehicle safely and efficiently from one place to another. The annual growth rate of air traffic in India is approximately 18% and it is greater than rest of the world, which is leading to air space congestion and bringing a great difficulty in controlling the air traffic. In order to control this increased air-traffic efficiently. Satellite based navigation system (e.g. GPS, GALILEO and GLONASS) have to be used in place of the existing ground based navigation systems such as NBD, VOR, DME, ILS etc., as the ground based navigation system offer limited accuracy due to multipath and angular nature of radiating beams. The GPS is a satellite based modern navigation system that provides accurate three dimensional (3D) position, velocity and timing information up to 10-6 sec anywhere on or above the earthand#8223;s surface. The GPS is a location system based on the constellation of 24 satellites, orbiting round the earth at altitudes of 20,200km. GPS system provides precise 3D navigation solution of the order of 30m and 45m horizontal and vertical accuracies respectively. The 3D position determination is based on the concept of trilateration. In this concept, the unknown 3D position (x-, y- and z- coordinates) of the receiver is computed by estimating the satellite positions in the space and measuring the distances to each satellite from the receiver. This distance is referred to as the pseudorange. The pseudorange is calculated by multiplying the radio signal velocity (3×108m/sec) with the signaland#8223;s travel time from the satellite to the receiver. The user receiver position can be determined by solving the navigation equations which are formed by measuring the pseudoranges from at least four satellites.

Appendices p.205-227, References p.228-235

Advisors/Committee Members: Sasi Bhushana Rao, G.

Subjects/Keywords: Electronics Engineering; Very High Frequency Omni directional Range; Global Navigation Satellite System; GPS Architecture; Pseudorandom Noise

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APA (6^th Edition):

Gudla, S. K. (2013). GPS signal propagation characteristics analysis and development of a new navigation solution for precise navigation applications; -. (Thesis). Andhra University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/12748

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gudla, Sateesh Kumar. “GPS signal propagation characteristics analysis and development of a new navigation solution for precise navigation applications; -.” 2013. Thesis, Andhra University. Accessed April 23, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/12748.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gudla, Sateesh Kumar. “GPS signal propagation characteristics analysis and development of a new navigation solution for precise navigation applications; -.” 2013. Web. 23 Apr 2021.

Vancouver:

Gudla SK. GPS signal propagation characteristics analysis and development of a new navigation solution for precise navigation applications; -. [Internet] [Thesis]. Andhra University; 2013. [cited 2021 Apr 23]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12748.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gudla SK. GPS signal propagation characteristics analysis and development of a new navigation solution for precise navigation applications; -. [Thesis]. Andhra University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12748

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

20. Adámať, Martin. Geodetické zaměření a vyhotovení technické mapy lokality Gymnázia Matyáše Lercha.: Surveying and Elaboration of Technical Map of the Locality of Matyáš Lerch Gymnasium.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/62366

► Bachelor thesis describes the creation of the technical map of situation around Matyáš Lerch´s high school in Brno. The thesis describes all stages of the… (more)

Subjects/Keywords: technická mapa; globálne družicové systémy; vyrovnanie siete; podrobné mapovanie; technical map; global navigation satellite system; network adjustment; large-scale mapping

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Adámať, M. (2020). Geodetické zaměření a vyhotovení technické mapy lokality Gymnázia Matyáše Lercha.: Surveying and Elaboration of Technical Map of the Locality of Matyáš Lerch Gymnasium. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/62366

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Adámať, Martin. “Geodetické zaměření a vyhotovení technické mapy lokality Gymnázia Matyáše Lercha.: Surveying and Elaboration of Technical Map of the Locality of Matyáš Lerch Gymnasium.” 2020. Thesis, Brno University of Technology. Accessed April 23, 2021. http://hdl.handle.net/11012/62366.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Adámať, Martin. “Geodetické zaměření a vyhotovení technické mapy lokality Gymnázia Matyáše Lercha.: Surveying and Elaboration of Technical Map of the Locality of Matyáš Lerch Gymnasium.” 2020. Web. 23 Apr 2021.

Vancouver:

Adámať M. Geodetické zaměření a vyhotovení technické mapy lokality Gymnázia Matyáše Lercha.: Surveying and Elaboration of Technical Map of the Locality of Matyáš Lerch Gymnasium. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/11012/62366.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Adámať M. Geodetické zaměření a vyhotovení technické mapy lokality Gymnázia Matyáše Lercha.: Surveying and Elaboration of Technical Map of the Locality of Matyáš Lerch Gymnasium. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/62366

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Helsinki

21. Lehtinen, Jukka. Correction methods of raw GNSS-data needed in automatic steering of a tractor.

Degree: Department of Agricultural Sciences; Helsingfors universitet, Agrikultur- och forstvetenskapliga fakulteten, Institutionen för lantsbruksvetenskaper, 2015, University of Helsinki

URL: http://hdl.handle.net/10138/155827

► Need for higher productivity motivates and forces farmers to adapt new technological solutions. Global Navigation Satellite Systems (GNSS) have enabled several solutions to increase efficiency… (more)

Subjects/Keywords: RTK; Global Navigation Satellite System; GNSS; automatic steering; positioning data correction service; Egnos; Omnistar; Agroteknologi; Agrotechnology; Agroteknologia

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lehtinen, J. (2015). Correction methods of raw GNSS-data needed in automatic steering of a tractor. (Masters Thesis). University of Helsinki. Retrieved from http://hdl.handle.net/10138/155827

Chicago Manual of Style (16^th Edition):

Lehtinen, Jukka. “Correction methods of raw GNSS-data needed in automatic steering of a tractor.” 2015. Masters Thesis, University of Helsinki. Accessed April 23, 2021. http://hdl.handle.net/10138/155827.

MLA Handbook (7^th Edition):

Lehtinen, Jukka. “Correction methods of raw GNSS-data needed in automatic steering of a tractor.” 2015. Web. 23 Apr 2021.

Vancouver:

Lehtinen J. Correction methods of raw GNSS-data needed in automatic steering of a tractor. [Internet] [Masters thesis]. University of Helsinki; 2015. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/10138/155827.

Council of Science Editors:

Lehtinen J. Correction methods of raw GNSS-data needed in automatic steering of a tractor. [Masters Thesis]. University of Helsinki; 2015. Available from: http://hdl.handle.net/10138/155827

Ohio University

22. Cheng, Chao-heh. Calculations for positioning with the Global Navigation Satellite System.

Degree: MS, Electrical Engineering & Computer Science (Engineering and Technology), 1998, Ohio University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176839268

Calculations for positioning with the Global Navigation Satellite System Advisors/Committee Members: van Graas, Frank (Advisor).

Subjects/Keywords: Global Navigation Satellite System; GLONASS; Weighted Least Squares Method

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cheng, C. (1998). Calculations for positioning with the Global Navigation Satellite System. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176839268

Chicago Manual of Style (16^th Edition):

Cheng, Chao-heh. “Calculations for positioning with the Global Navigation Satellite System.” 1998. Masters Thesis, Ohio University. Accessed April 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176839268.

MLA Handbook (7^th Edition):

Cheng, Chao-heh. “Calculations for positioning with the Global Navigation Satellite System.” 1998. Web. 23 Apr 2021.

Vancouver:

Cheng C. Calculations for positioning with the Global Navigation Satellite System. [Internet] [Masters thesis]. Ohio University; 1998. [cited 2021 Apr 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176839268.

Council of Science Editors:

Cheng C. Calculations for positioning with the Global Navigation Satellite System. [Masters Thesis]. Ohio University; 1998. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176839268

KTH

23. Bommakanti, Hemanth Ram Kartik. Impact of Time Synchronization Accuracy in Integrated Navigation Systems.

Degree: Electrical Engineering and Computer Science (EECS), 2019, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260239

►

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… (more)

▼

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…

Subjects/Keywords: Real-Time Solution; Time Synchronization; Integrated Navigation System; Global Navigation Satellite System; Inertial Measurement Unit; Realtidslösning; tidssynkronisering; integrerat navigationssystem; globalt satellitbaserat navigationssystem; tröghetsmätningsenhet; Computer and Information Sciences; Data- och informationsvetenskap

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bommakanti, H. R. K. (2019). Impact of Time Synchronization Accuracy in Integrated Navigation Systems. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260239

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bommakanti, Hemanth Ram Kartik. “Impact of Time Synchronization Accuracy in Integrated Navigation Systems.” 2019. Thesis, KTH. Accessed April 23, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260239.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bommakanti, Hemanth Ram Kartik. “Impact of Time Synchronization Accuracy in Integrated Navigation Systems.” 2019. Web. 23 Apr 2021.

Vancouver:

Bommakanti HRK. Impact of Time Synchronization Accuracy in Integrated Navigation Systems. [Internet] [Thesis]. KTH; 2019. [cited 2021 Apr 23]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260239.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bommakanti HRK. Impact of Time Synchronization Accuracy in Integrated Navigation Systems. [Thesis]. KTH; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260239

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

24. De Bakker, P.F. On User Algorithms for GNSS Precise Point Positioning.

Degree: 2016, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd

► Precise Point Positioning (PPP) is a Global Navigation Satellite System (GNSS) processing method with the objective of providing high positioning accuracy without the need for… (more)

▼ Precise Point Positioning (PPP) is a Global Navigation Satellite System (GNSS) processing method with the objective of providing high positioning accuracy without the need for a nearby base station or dense network of reference stations operated by the user. To reach this objective, PPP uses the very precise carrier phase measurements in addition to the coarse pseudorange measurements, and precise satellite orbits and clock offsets. Before the carrier phase measurements can contribute to the position solution, the carrier phase biases must be estimated from the measurements. Additionally, to compute an accurate position, a number of approaches are used in PPP to reduce the error contributions. A sparse global network of reference stations estimates very accurate satellite orbits and clock offsets, and provides these to the user. A priori models are used to correct for the hydrostatic troposphere delay, relativistic effects, carrier phase wind-up, phase center offsets and variations. We will mainly consider users on or close to the surface of the Earth, which means that site displacement effects (e.g. ocean loading and solid Earth tides) also should be taken into account. The troposphere wet delay is often estimated from the data, and, in conventional PPP, the ionosphere delays are eliminated by combining dual-frequency observations in a reduced number of ionosphere-free observations. The accuracy provided by PPP based on GPS is very high; just a few mm for 24h of static data. However, PPP can still be improved in a number of areas which are addressed in this dissertation: - The need to both eliminate the ionosphere delays and estimate the carrier phase ambiguities results in a relatively weak model. This leads to long (re)initialization times before an accurate position can be computed. In this dissertation a different approach is proposed, implemented and tested that does not form the ionosphere-free combination, but estimates the ionosphere-delays from the observations. First the (linearized) GNSS observation equations are introduced and the functional PPP model is derived. From this we determine the estimable parameters, and treat the possibility of constraining the ionosphere estimation by use of external ionosphere data. This is achieved by correcting the observations with ionosphere model values and estimating only the residual ionosphere delay. Finally, a dynamic model for the residual ionosphere delays is determined and positioning results are presented. - An accurate stochastic model for PPP is lacking, which leads to a suboptimal weighting of the different observation types, an inadequate quality description of the solution, and unreliable hypothesis testing. In this dissertation the stochastic properties of the PPP model are studied starting with the accuracy of the (real-time) satellite orbit and clock offsets, and continuing with the accuracy and correlation of the GNSS observations. For the latter a newly developed method is introduced based on the geometry-free model. This analysis also includes an… Advisors/Committee Members: Teunissen, P.J.G., Van der Marel, H..

Subjects/Keywords: PPP; Precise Point Positioning; GNSS; Global Navigation Satellite System; GPS; Global Positioning System

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APA (6^th Edition):

De Bakker, P. F. (2016). On User Algorithms for GNSS Precise Point Positioning. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd

Chicago Manual of Style (16^th Edition):

De Bakker, P F. “On User Algorithms for GNSS Precise Point Positioning.” 2016. Doctoral Dissertation, Delft University of Technology. Accessed April 23, 2021. http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd.

MLA Handbook (7^th Edition):

De Bakker, P F. “On User Algorithms for GNSS Precise Point Positioning.” 2016. Web. 23 Apr 2021.

Vancouver:

De Bakker PF. On User Algorithms for GNSS Precise Point Positioning. [Internet] [Doctoral dissertation]. Delft University of Technology; 2016. [cited 2021 Apr 23]. Available from: http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd.

Council of Science Editors:

De Bakker PF. On User Algorithms for GNSS Precise Point Positioning. [Doctoral Dissertation]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; urn:NBN:nl:ui:24-uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd ; http://resolver.tudelft.nl/uuid:98b1de71-6d51-446a-b161-c8fb58fbcafd

Univerzitet u Beogradu

25. Tadić, Srđan V., 1978-. Одређивање трајектологије возила при судару употребом интегрисаног система сателитске и инерцијалне навигације.

Degree: Elektrotehnički fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:14243/bdef:Content/get

►

Телекомуникације - сателитски системи, инерцијална навигација, естимација / Telecommunications

Преко милион особа годишње изгуби живот у саобраћајним несрећама. Према подацима Светске Здравствене Организације, од 1896.… (more)

Subjects/Keywords: global navigation satellite systems; inertial navigation; navigation; microelectromechanical sensors; accelerometers; rate gyroscopes; vehicle crashes

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APA (6^th Edition):

Tadić, Srđan V., 1. (2016). Одређивање трајектологије возила при судару употребом интегрисаног система сателитске и инерцијалне навигације. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:14243/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tadić, Srđan V., 1978-. “Одређивање трајектологије возила при судару употребом интегрисаног система сателитске и инерцијалне навигације.” 2016. Thesis, Univerzitet u Beogradu. Accessed April 23, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:14243/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tadić, Srđan V., 1978-. “Одређивање трајектологије возила при судару употребом интегрисаног система сателитске и инерцијалне навигације.” 2016. Web. 23 Apr 2021.

Vancouver:

Tadić, Srđan V. 1. Одређивање трајектологије возила при судару употребом интегрисаног система сателитске и инерцијалне навигације. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Apr 23]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:14243/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tadić, Srđan V. 1. Одређивање трајектологије возила при судару употребом интегрисаног система сателитске и инерцијалне навигације. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:14243/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Ohio University

26. Akos, Dennis M. A software radio approach to Global Navigation Satellite System receiver design.

Degree: PhD, Electrical Engineering & Computer Science (Engineering and Technology), 1997, Ohio University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1174615606

► The software radio has been described as the most significant evolution in receiver design since the development of the superheterodyne concept in 1918. The… (more)

▼ The software radio has been described as the most significant evolution in receiver design since the development of the superheterodyne concept in 1918. The software radio design philosophy is to position an analog-to-digital converter (ADC) as close to the antenna as possible and then process the samples using a combination of software and a programmable microprocessor. There are a number of important advantages to be gained through full exploitation of the software radio concept. The most notable include: 1) The removal of analog signal processing components and their associated nonlinear, temperature-based, and age-based performance characteristics. 2) A single antenna/front-end configuration can be used to receive and demodulate a variety of radio frequency (RF) transmissions. 3) The software radio provides the ultimate simulation/testing environment. Global Navigation Satellite Systems (GNSSs) are the latest and most complex radionavigation systems in widespread use. The United States' Global Positioning System (GPS) and, to a lesser extent, the Russian Global Orbiting Navigation Satellite System (GLONASS) are being targeted for use as next generation aviation navigation systems. As a result, it is critical that a GNSS achieve the reliability and integrity necessary for use within the aerospace system. The receiver design is a key element in achieving the high standards required. This work presents the complete development of a GNSS software radio. A GNSS receiver front end has been constructed, based on the software radio design goals, and has been evaluated against the traditional design. Trade-offs associated with each implementation are presented along with experimental results. Novel bandpass sampling front end designs have been proposed, implemented and tested for the processing of multiple GNSS transmissions. Finally, every aspect of GNSS signal processing has been implemented in software from the necessary spread spectrum acquisition algorithms to those required for a position solution. The GNSS software radio is the first of its kind and will thus bring all the assets associated with the concept into GNSS receiver research. Not only does the work describe the multiple benefits available through a GNSS software radio implementation, but it also establishes the feasibility of such through actual hardware design and experimental results. Advisors/Committee Members: Braasch, Michael (Advisor).

Subjects/Keywords: software radio approach; Global Navigation Satellite System; GNSS; Russian Global Orbiting Navigation Satellite System; analog-to-digital converter

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Akos, D. M. (1997). A software radio approach to Global Navigation Satellite System receiver design. (Doctoral Dissertation). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1174615606

Chicago Manual of Style (16^th Edition):

Akos, Dennis M. “A software radio approach to Global Navigation Satellite System receiver design.” 1997. Doctoral Dissertation, Ohio University. Accessed April 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1174615606.

MLA Handbook (7^th Edition):

Akos, Dennis M. “A software radio approach to Global Navigation Satellite System receiver design.” 1997. Web. 23 Apr 2021.

Vancouver:

Akos DM. A software radio approach to Global Navigation Satellite System receiver design. [Internet] [Doctoral dissertation]. Ohio University; 1997. [cited 2021 Apr 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1174615606.

Council of Science Editors:

Akos DM. A software radio approach to Global Navigation Satellite System receiver design. [Doctoral Dissertation]. Ohio University; 1997. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1174615606

Ohio University

27. Wellons, William Lee. A shipboard global positioning system carrier phase interferometric aircraft flight reference system.

Degree: MS, Electrical Engineering & Computer Science (Engineering and Technology), 1994, Ohio University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1179860957

Subjects/Keywords: Instrument Landing System; Microwave Landing System; Navigation Satellite Timing; Ranging Global Positioning System

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APA (6^th Edition):

Wellons, W. L. (1994). A shipboard global positioning system carrier phase interferometric aircraft flight reference system. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1179860957

Chicago Manual of Style (16^th Edition):

Wellons, William Lee. “A shipboard global positioning system carrier phase interferometric aircraft flight reference system.” 1994. Masters Thesis, Ohio University. Accessed April 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1179860957.

MLA Handbook (7^th Edition):

Wellons, William Lee. “A shipboard global positioning system carrier phase interferometric aircraft flight reference system.” 1994. Web. 23 Apr 2021.

Vancouver:

Wellons WL. A shipboard global positioning system carrier phase interferometric aircraft flight reference system. [Internet] [Masters thesis]. Ohio University; 1994. [cited 2021 Apr 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1179860957.

Council of Science Editors:

Wellons WL. A shipboard global positioning system carrier phase interferometric aircraft flight reference system. [Masters Thesis]. Ohio University; 1994. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1179860957

28. Pereira, Jorge Afonso. Fly by data link: feasibility of a relative navigation solution for aviation relying on a future L-band data link.

Degree: 2015, Repositório Científico do Instituto Politécnico de Lisboa

URL: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/6006

►

Trabalho final de Mestrado para obtenção do grau de Mestre em Engenharia de Electrónica e Telecomunicações

O presente trabalho estuda uma solução alternativa de navegação… (more)

▼

Trabalho final de Mestrado para obtenção do grau de Mestre em Engenharia de Electrónica e Telecomunicações

O presente trabalho estuda uma solução alternativa de navegação aeronáutica que contribua para a racionalização da infrastrutura terrestre de ajudas-rádio de navegação na Europa. O conceito designado de “Performance Based Navigation (PBN)” emerge actualmente ao nível da Organização Internacional de Aviação Civil, visando o aperfeiçoamento do sistema de gestão do tráfego aéreo ao nível da eficiência, segurançae capacidade. O conceito PBN promove a modernização da infrastrutura aeronáutica com base na utilização preferencial de sistemas de navegação por satélite, designadamente mediante o recurso a sinais disponibilizados pelas constelações “Global Navigation Satellite System (GNSS)”. Face às vulnerabilidades dos sistemas GNSS a interferências RF, “jamming” deliberado ou fenómenos solares, foi decidido manter uma infrastrutura de recurso/”backup”, para mitigar falhas GNSS, baseada numa redede rádio-ajudas terrestres “Distance Measuring Equipment (DME)”. Visto que estes DMEs não facultam uma boa cobertura, especialmente a baixa altitude, e tratando-se de equipamentos próximos da obsolescência tecnológica e pouco eficientes em termos de espectro rádioeléctrico, a sua racionalização requer uma tecnologia alternativa. O presente trabalho explora o recurso a novas tecnologias aeronáuticas de comunicações dados ar-solo, designadamente o futuro “data link” OFDM/TDMA de banda L (LDACS), verificando a sua adequação para suportarem as funções de navegação descritas substituindo os DMEs. Pretende-se confirmar a viabilidade com base no conceito de Navegação Relativa (RELNAV) usado em contexto militar recorrendo a filtros Kalman. As características da tecnologia LDACS são descritas e são apresentados resultados de testes do seu desempenho em termos de medição de distâncias (“ranging”). Com base nas capacidades RELNAV militares são propostos melhoramentos baseadosem filtros Kalman, simulando para demonstrar que o LDACS pode ser usado para funçãode navegação. Demonstrada a viabilidade, fica em aberto a oportunidade para sinergias que poderão viabilizar a racionalização da infrastrutura terrestre de navegação e aviónicos.

The main purpose of this work is to study an alternative solution for aeronautical aircraft navigation contributing to the rationalization of the existing European ground navigation infrastructure. The emerging Performance Based Navigation (PBN) concept, described in the document 9613 of the International Civil Aviation Organization (ICAO), calls for increased reliance on Global Navigation Satellite Systems (GNSS) (and its augmentation/differential correction systems1) but retaining ground beacons such as the Distance Measuring Equipments (DME) to cope with Global Positioning System (GPS) and GALILEO outages (e.g. jamming/solar storms). The present work will focus on demonstrating the…

Advisors/Committee Members: Vieira, Pedro Manuel de Almeida Carvalho.

Subjects/Keywords: Tráfego aéreo; Navegação aeronáutica; Espectro na banda L; Navegação por satélite; Comunicações Data link; Navegação relativa; Filtro Kalman; Distância; Air traffic; Aeronautical navigation; L-Band spectrum; Satellite navigation; Air-Ground data link; Relative navigation; Kalman filter; Global navigation satellite system (GNSS); Distance measuring equipment (DME); Ranging; Time difference of arrival; Satellite outages; OFDM technology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pereira, J. A. (2015). Fly by data link: feasibility of a relative navigation solution for aviation relying on a future L-band data link. (Thesis). Repositório Científico do Instituto Politécnico de Lisboa. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/6006

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pereira, Jorge Afonso. “Fly by data link: feasibility of a relative navigation solution for aviation relying on a future L-band data link.” 2015. Thesis, Repositório Científico do Instituto Politécnico de Lisboa. Accessed April 23, 2021. http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/6006.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pereira, Jorge Afonso. “Fly by data link: feasibility of a relative navigation solution for aviation relying on a future L-band data link.” 2015. Web. 23 Apr 2021.

Vancouver:

Pereira JA. Fly by data link: feasibility of a relative navigation solution for aviation relying on a future L-band data link. [Internet] [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2015. [cited 2021 Apr 23]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/6006.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pereira JA. Fly by data link: feasibility of a relative navigation solution for aviation relying on a future L-band data link. [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2015. Available from: http://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/6006

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universitat Politècnica de Catalunya

29. Ghavidel, Ali. Contributions to the determination of electromagnetic bias in Gnss-R altimetry.

Degree: Departament de Teoria del Senyal i Comunicacions, 2015, Universitat Politècnica de Catalunya

URL: http://hdl.handle.net/10803/312844

► En esta tesis doctoral se estudia el sesgo electromagnético en altimetría GNSS-R (Global Navigation Satellite Systems Reflectometry). La altimetría GNSS-R es un nuevo tipo de… (more)

▼ En esta tesis doctoral se estudia el sesgo electromagnético en altimetría GNSS-R (Global Navigation Satellite Systems Reflectometry). La altimetría GNSS-R es un nuevo tipo de sistema que utiliza las señales de navegación como señales de oportunidad para la observación de la tierra. El sesgo electromagnético ha sido un tema de investigación durante varias décadas en altimetría radar convencional utilizando típicamente las bandas C y Ku, y apuntando en la dirección nadir, pero es un tema novedoso en altimetría GNSS-R. En primer lugar se revisan los estudios previos sobre el sesgo electromagnético: la Weakly Non-Linear theory (WNL), la Modulation Transfer Function (MTF), y modelos combinados de ambos. Después de un breve estudio tanto de la WNL como de la MTF, se selecciona un modelo combinado, se simula, y valida en las bandas C y Ku, y luego es extrapolado a la banda L, la banda de las señales de los GNSS. En segundo lugar, se estudia el sesgo electromagnético en el dominio del tiempo y es caracterizado utilizando descriptores estadísticos. Por último, se calcula el impacto de los fenómenos naturales como la lluvia, el oleaje y las corrientes en el sesgo electromagnético . En conclusión, esta tesis doctoral ha demostrado que el sesgo electromagnético no es sólo una función de la velocidad del viento (o del oleaje), sino que también es una función tanto del ángulo de incidencia, como del ángulo de acimut. El estudio en el dominio del tiempo ha demostrado que tiene un comportamiento no lineal. Por otra parte, las fuertes lluvias disminuyen el sesgo electromagnético, pues amortiguan las olas, mientras que las corrientes con dirección opuesta al viento aumentan el sesgo electromagnético, pues aumentan la "rugosidad" superficial, mientras que la corriente tiene la misma dirección de la velocidad del viento, lo reduce. Advisors/Committee Members: [email protected] (authoremail), false (authoremailshow), Camps Carmona, Adriano José (director), true (authorsendemail).

Subjects/Keywords: Global Navigation Satellite Systems Reflectometry; Altimetría GNSS-R; 55; 621.3

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ghavidel, A. (2015). Contributions to the determination of electromagnetic bias in Gnss-R altimetry. (Thesis). Universitat Politècnica de Catalunya. Retrieved from http://hdl.handle.net/10803/312844

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ghavidel, Ali. “Contributions to the determination of electromagnetic bias in Gnss-R altimetry.” 2015. Thesis, Universitat Politècnica de Catalunya. Accessed April 23, 2021. http://hdl.handle.net/10803/312844.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ghavidel, Ali. “Contributions to the determination of electromagnetic bias in Gnss-R altimetry.” 2015. Web. 23 Apr 2021.

Vancouver:

Ghavidel A. Contributions to the determination of electromagnetic bias in Gnss-R altimetry. [Internet] [Thesis]. Universitat Politècnica de Catalunya; 2015. [cited 2021 Apr 23]. Available from: http://hdl.handle.net/10803/312844.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghavidel A. Contributions to the determination of electromagnetic bias in Gnss-R altimetry. [Thesis]. Universitat Politècnica de Catalunya; 2015. Available from: http://hdl.handle.net/10803/312844

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

30. Ziebart, Marek. High precision analytical solar radiation pressure modelling for GNSS spacecraft.

Degree: PhD, 2001, University of East London

URL: https://repository.uel.ac.uk/item/869w7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364487

► In global navigation satellite systems (GNSS) a fundamental operational component is the calculation of the orbits of the system spacecraft. This requires understanding and modelling… (more)

▼ In global navigation satellite systems (GNSS) a fundamental operational component is the calculation of the orbits of the system spacecraft. This requires understanding and modelling the forces that act on the spacecraft. Solar radiation pressure (SRP) is the force caused by the impact of solar photons on the spacecraft surface. For GNSS spacecraft this is a significant force. If SRP is not included in the force model, then the calculated position of the spacecraft can be in error by between one and two hundred metres after one 12-hour orbit. SRP can be modelled using either analytical or empirical methods, or by some combination of the two. Historically, analytical SRP modelling has been somewhat neglected and high precision orbit estimation has relied upon empirical methods to account for SRP. Even so, most of these empirical methods start the estimation process with an a priori analytical model. The success of this empirical approach relies upon having many observations of the range between the system spacecraft and ground-based tracking stations, and works well within the context of the International Global Positioning System Service (IGS) network, which provides the necessary data volume. However, empirical methods do not work as well in operational GNSS, as these typically have a relatively small number of tracking stations. Moreover, empirical methods cannot be applied at the GNSS design stage, where knowledge of the system dynamics plays a key role. Existing methods for calculating analytical SRP models can only be used with relatively simple spacecraft structures, and lack flexibility as tools for analysis. In this study a new method is developed for calculating analytical SRP models that can cope with a high level of complexity in the spacecraft structure. The method is based upon simulating the solar photon flux with a pixel array. Using the method, models are calculated and tested for the Russian GLONASS IIv spacecraft. This particular spacecraft was used as the testbed because, at the time the study was being conducted, an international scientific campaign - called IGEX-98, the International GLONASS Experiment - was being carried out to analyse the Russian system. Developing force models for the spacecraft was one of the campaign goals, and the IGEX-98 steering committee accepted a proposal to use SRP models for GLONASS from this study. A detailed description is given of all the mathematics and physics that was used to develop the modelling technique. The method by which the models can be calculated and applied in practical orbit determination is also provided. In order to test the performance of the SRP models computed for the GLONASS spacecraft using the new method, comparisons were made between two kinds of trajectory. The first kind was calculated by numerical integration of the spacecraft's second order differential equation of motion, where this force model included the custom SRP models developed in the thesis. The second kind of trajectory, which is used as a 'truth' model in the study, was a…

Subjects/Keywords: 629.41; Global navigation satellite systems

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ziebart, M. (2001). High precision analytical solar radiation pressure modelling for GNSS spacecraft. (Doctoral Dissertation). University of East London. Retrieved from https://repository.uel.ac.uk/item/869w7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364487

Chicago Manual of Style (16^th Edition):

Ziebart, Marek. “High precision analytical solar radiation pressure modelling for GNSS spacecraft.” 2001. Doctoral Dissertation, University of East London. Accessed April 23, 2021. https://repository.uel.ac.uk/item/869w7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364487.

MLA Handbook (7^th Edition):

Ziebart, Marek. “High precision analytical solar radiation pressure modelling for GNSS spacecraft.” 2001. Web. 23 Apr 2021.

Vancouver:

Ziebart M. High precision analytical solar radiation pressure modelling for GNSS spacecraft. [Internet] [Doctoral dissertation]. University of East London; 2001. [cited 2021 Apr 23]. Available from: https://repository.uel.ac.uk/item/869w7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364487.

Council of Science Editors:

Ziebart M. High precision analytical solar radiation pressure modelling for GNSS spacecraft. [Doctoral Dissertation]. University of East London; 2001. Available from: https://repository.uel.ac.uk/item/869w7 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364487

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