Gps Gnss Antennas

GPS GNSS Antennas PDF
Author: B. Rama Rao
Publisher: Artech House
ISBN: 1596931507
Release: 2013
Size: 67.24 MB
Format: PDF, Docs
Category : Technology & Engineering
Languages : un
Pages : 404
View: 3718

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by B. Rama Rao, Gps Gnss Antennas Books available in PDF, EPUB, Mobi Format. Download Gps Gnss Antennas books, Introduction to GNSS antenna performance parameters -- FRPAs and high-gain directional antennas -- Multiband, handset, and active GNSS antennas -- Adaptive GPS antennas -- Ground plane, aircraft fuselage, and other platform effects on GPS antennas -- Measurement of the characteristics of GNSS antennas -- Antennas and site considerations for precise applications.



Antennas For Global Navigation Satellite Systems

Antennas for Global Navigation Satellite Systems PDF
Author: Xiaodong Chen
Publisher: John Wiley & Sons
ISBN: 111994032X
Release: 2012-02-21
Size: 37.95 MB
Format: PDF, Mobi
Category : Technology & Engineering
Languages : un
Pages : 256
View: 113

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Antennas For Global Navigation Satellite Systems PDF Full

by Xiaodong Chen, Antennas For Global Navigation Satellite Systems Books available in PDF, EPUB, Mobi Format. Download Antennas For Global Navigation Satellite Systems books, This book addresses the fundamentals and practical implementations of antennas for Global Navigation Satellite Systems (GNSS) In this book, the authors discuss the various aspects of GNSS antennas, including fundamentals of GNSS, design approaches for the GNSS terminal and satellite antennas, performance enhancement techniques and effects of user’s presence and surrounding environment on these antennas. In addition, the book will provide the reader with an insight into the most important aspects of the GNSS antenna technology and lay the foundations for future advancements. It also includes a number of real case studies describing the ways in which antenna design can be adapted to conform to the design constraints of practical user devices, and also the management of potential adverse interactions between the antenna and its platform. Key Features: Covers the fundamentals and practical implementations of antennas for Global Navigation Satellite Systems (GNSS) Describes technological advancements for GPS, Glonass, Galileo and Compass Aims to address future issues such as multipath interference, in building operation, RF interference in mobile Includes a number of real case studies to illustrate practical implementation of GNSS This book will be an invaluable guide for antenna designers, system engineers, researchers for GNSS systems and postgraduate students (antennas, satellite communication technology). R&D engineers in mobile handset manufacturers, spectrum engineers will also find this book of interest.



Gps Satellite Surveying

GPS Satellite Surveying PDF
Author: Alfred Leick
Publisher: John Wiley & Sons
ISBN: 1118675576
Release: 2015-03-02
Size: 10.92 MB
Format: PDF, Kindle
Category : Science
Languages : un
Pages : 840
View: 716

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Gps Satellite Surveying PDF Full

by Alfred Leick, Gps Satellite Surveying Books available in PDF, EPUB, Mobi Format. Download Gps Satellite Surveying books, GPS Satellite Surveying is the classic text on the subject, providing the most comprehensive coverage of global navigation satellite systems applications for surveying. Fully updated and expanded to reflect the field's latest developments, this new edition contains new information on GNSS antennas, Precise Point Positioning, Real-time Relative Positioning, Lattice Reduction, and much more. New contributors offer additional insight that greatly expands the book's reach, providing readers with complete, in-depth coverage of geodetic surveying using satellite technologies. The newest, most cutting-edge tools, technologies, and applications are explored in-depth to help readers stay up to date on best practices and preferred methods, giving them the understanding they need to consistently produce more reliable measurement.



Analysis And Corrections Of Non Hydrostatic Effects And Gnss Antenna Errors For Accurate Gps And Galileo Iwv Estimates

Analysis and Corrections of Non hydrostatic Effects and GNSS Antenna Errors for Accurate GPS and GALILEO IWV Estimates PDF
Author: Francesca Scirè Scappuzzo
Publisher:
ISBN:
Release: 2009
Size: 14.73 MB
Format: PDF, ePub
Category :
Languages : un
Pages : 188
View: 2993

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Analysis And Corrections Of Non Hydrostatic Effects And Gnss Antenna Errors For Accurate Gps And Galileo Iwv Estimates PDF Full

by Francesca Scirè Scappuzzo, Analysis And Corrections Of Non Hydrostatic Effects And Gnss Antenna Errors For Accurate Gps And Galileo Iwv Estimates Books available in PDF, EPUB, Mobi Format. Download Analysis And Corrections Of Non Hydrostatic Effects And Gnss Antenna Errors For Accurate Gps And Galileo Iwv Estimates books,



Single Antenna Null Steering For Gps Gnss Aerial Applications

Single Antenna Null steering for GPS   GNSS Aerial Applications PDF
Author: Emily McMilin
Publisher:
ISBN:
Release: 2016
Size: 54.79 MB
Format: PDF, ePub, Docs
Category :
Languages : un
Pages :
View: 7278

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Single Antenna Null Steering For Gps Gnss Aerial Applications PDF Full

by Emily McMilin, Single Antenna Null Steering For Gps Gnss Aerial Applications Books available in PDF, EPUB, Mobi Format. Download Single Antenna Null Steering For Gps Gnss Aerial Applications books, As the utility of the Global Positioning System (GPS) and other Global Navigation Satellite Systems (GNSS) continue to pervade -and upgrade- our daily activities, our increased reliance makes us more vulnerable to the inherent weaknesses of GPS. The incredible faintness and unencrypted nature of the GNSS signal exposes it to both unintentional and intentional overwhelming, via mechanisms such as interference, jamming and spoofing (the broadcast of counterfeit GNSS signals intended to deceive a GNSS receiver). However some may argue that despite the great risk, the probability of a jamming or spoofing event is thankfully low. The argument may continue, that correspondingly few resources should be dedicated to protect against a low probability event. I attempt to resolve the tension between these high risk yet low probability scenarios by establishing antenna designs that provide protection while exploiting existing infrastructure and equipment, thus requiring minimal additional resource dedication. This thesis will start with an introduction of a low complexity mechanism for generating radiation pattern nulls and beams with a single antenna, without requiring any additional hardware or signal processing blocks beyond those already inherent to GNSS receiver systems. I will describe the basic mathematical model that underlies this mechanism and share simulation results. I will then introduce two applications of this mechanism: single antenna interference/jam suppression and single antenna spoof detection. Results from simulations and two field trials will be presented: one with a software implementation using a software defined radio, and the other with a hardware prototype implemented in off-the-shelf components using a standard GPS receiver. Results show about 15 dB of interference/jam suppression and robust spoof detection, when the threatening signals originate from below the horizon of the GNSS antenna, making aerial platforms an ideal application.



Multifunctional Operation And Application Of Gps

Multifunctional Operation and Application of GPS PDF
Author: Rustam B. Rustamov
Publisher: BoD – Books on Demand
ISBN: 1789232147
Release: 2018-05-30
Size: 46.85 MB
Format: PDF, Kindle
Category : Technology & Engineering
Languages : un
Pages : 216
View: 3115

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by Rustam B. Rustamov, Multifunctional Operation And Application Of Gps Books available in PDF, EPUB, Mobi Format. Download Multifunctional Operation And Application Of Gps books, Today, Global Positioning System (GPS) has taken a significant place in human life with wide-scale applications. It is a multi-use, space-based radio-navigation system, embracing defense and security, civil, commercial, and scientific research needs. Taking into account the importance of the system, it has been suggested to present current advances of GPS with attention focused on vital aspects of technology. This book provides a general description of GPS, GNSS, and GLONASS with reference to the improvement of characteristics of the segments, including software applications and the equipment itself containing GPS. The book also provides information on application areas. Equally, a number of common shortcomings and errors are described, and elimination and mnimization of such consequences are demonstrated.



Understanding Gps Gnss Principles And Applications Third Edition

Understanding GPS GNSS  Principles and Applications  Third Edition PDF
Author: Elliott D. Kaplan
Publisher: Artech House
ISBN: 1630814423
Release: 2017-05-31
Size: 38.40 MB
Format: PDF, Mobi
Category : Technology & Engineering
Languages : en
Pages : 1064
View: 5668

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Understanding Gps Gnss Principles And Applications Third Edition PDF Full

by Elliott D. Kaplan, Understanding Gps Gnss Principles And Applications Third Edition Books available in PDF, EPUB, Mobi Format. Download Understanding Gps Gnss Principles And Applications Third Edition books, This thoroughly updated third edition of an Artech House bestseller brings together a team of leading experts providing a current and comprehensive treatment of global navigation satellite systems (GNSS) that readers won’t find in other resources. Packed with brand new material, this third edition includes new chapters on the system engineering details of GPS, European Galileo system, Chinese Beidou systems, GLONASS, and regional systems, such as Quasi–Zenith Satellite System (QZSS) and Navigation with Indian Constellation (NavIC). Readers also find new coverage of GNSS receivers, disruptions, errors, stand-alone GNSS performance, differential and precise point positioning. This single-source reference provides both a quick overview of GNSS essentials and an in-depth treatment of advanced topics and explores all the latest advances in technology, applications, and systems. Readers are guided in the development of new applications and on how to evaluate their performance. It explains all the differential GNSS services available to help decide which is best for a particular application. The book discusses the integration of GNSS with other sensors and network assistance. Readers learn how to build GNSS receivers and integrate them into navigational and communications equipment. Moreover, this unique volume helps determine how technology is affecting the marketplace and where best to invest in a company’s resources.



Fundamentals Of Satellite Navigation Systems

Fundamentals of Satellite Navigation Systems PDF
Author: A. B. Lawal
Publisher: A. B. Lawal
ISBN: 1386520578
Release: 2018-12-03
Size: 34.93 MB
Format: PDF
Category : Technology & Engineering
Languages : un
Pages :
View: 3031

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Fundamentals Of Satellite Navigation Systems PDF Full

by A. B. Lawal, Fundamentals Of Satellite Navigation Systems Books available in PDF, EPUB, Mobi Format. Download Fundamentals Of Satellite Navigation Systems books, The objective of this book is to provide you the reader a complete systems engineering treatment of GNSS. I am an expert with practical experience in GPS/GNSS design and similar areas that are addressed within the book. I provide a thorough, in-depth treatment of each topic. Within this and the rest of the series, updated information on GPS and GLONASS is presented. In particular, descriptions of new satellites, such as GPS III and GLONASS K2 and their respective signal sets (e.g., GPS III L1C and GLONASS L3OC), are included. In this part I are in-depth technical descriptions of each emerging satellite navigation system: BeiDou, Galileo, QZSS, and NavIC. Dedicated chapters cover each system's constellation configuration, satellites, ground control system and user equipment. Detailed satellite signal characteristics are also provided. Recently, I've heard from many engineers that they learned how GPS receivers work from this title. In this title, the design is included, and treatment of receivers is updated and expanded in several important ways. New material has been added on important receiver components, such as antennas and front-end electronics. The increased complexity of multiconstellation, multifrequency receivers, which are rapidly becoming the norm today, is addressed in detail. Other added features of this title are the clear step-by-step design process and associated trades required to develop a GNSS receiver, depending on the specific receiver application. This subject will be of great value to those readers who need to understand these concepts, either for their own design tasks or to aid their satellite navigation system engineering knowledge. To round out the discussion of receivers, updated treatments of interference, ionospheric scintillation, and multipath are provided along with new material on blockage from foliage, terrain, and man-made structures. Now there has been major developments in GNSS augmentations, including differential GNSS (DGNSS) systems, Precise Point Positioning (PPP) techniques, and the use of external sensors/networks. The numerous deployed or planned satellite-based augmentation system (SBAS) networks are detailed, including WAAS, EGNOS, MSAS, GAGAN, and SDCM, as are groundbased differential systems used for various applications. The use of PPP techniques has greatly increased in recent years, and the treatment in this title has been expanded accordingly. Material addressing integration of GNSS with other sensors has been thoroughly revamped, as has the treatment of network assistance as needed to reflect the evolution from 2G/3G to 4G cellular systems that now rely on multiconstellation GNSS receiver engines. While this title has generally been written for the engineering/scientific community, one of the series is devoted to GNSS markets and applications. Marketing projections (and the challenge thereof) are enumerated and discussion of the major applications is provided. As in the other series, this book is structured such that a reader with a general science background can learn the basics of GNSS. The reader with a stronger engineering/scientific background will be able to delve deeper and benefit from the more in-depth technical material. It is this ramp-up of mathematical/technical complexity along with the treatment of key topics that enables this publication to serve as a student text as well as a reference source.



Kunststoffpr Fung

Kunststoffpr  fung PDF
Author: Wolfgang Grellmann
Publisher: Carl Hanser Verlag GmbH Co KG
ISBN: 3446443908
Release: 2015-05-12
Size: 44.81 MB
Format: PDF, Kindle
Category : Technology & Engineering
Languages : de
Pages : 760
View: 2063

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Kunststoffpr Fung PDF Full

by Wolfgang Grellmann, Kunststoffpr Fung Books available in PDF, EPUB, Mobi Format. Download Kunststoffpr Fung books, Die enormen Zuwachsraten in der Kunststofferzeugung und -anwendung erhöhen die Forderung nach aussagekräftigen Mess- und Auswerteverfahren in der Kunststoffprüfung. Durch die Fortschritte in der elektronischen Messtechnik haben sich sowohl die klassischen Prüfverfahren weiterentwickelt als auch völlig neuartige Methoden etabliert. Die Aussagekraft dieser Kenngrößen zur Quantifizierung der Zusammenhänge zwischen der Mikrostruktur und den makroskopischen Eigenschaften wird dargestellt. Zusätzliche Informationen über die ablaufenden Schädigungsprozesse und -mechanismen können durch die Anwendung gekoppelter zerstörungsfreier Kunststoffprüfverfahren bzw. hybrider Methoden der Kunststoffdiagnostik gewonnen werden. An Hand von Beispielen zur Optimierung von Kunststoffen und Verbunden sowie zur Bewertung von Bauteileigenschaften wird ein werkstoffwissenschaftlich begründeter Einblick in die moderne Kunststoffprüfung vermittelt.



Handbuch Der Geod Sie

Handbuch der Geod  sie PDF
Author: Willi Freeden
Publisher: Springer Spektrum
ISBN: 9783642541360
Release: 2016-05-09
Size: 54.83 MB
Format: PDF, Kindle
Category : Science
Languages : de
Pages : 1000
View: 5001

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Handbuch Der Geod Sie PDF Full

by Willi Freeden, Handbuch Der Geod Sie Books available in PDF, EPUB, Mobi Format. Download Handbuch Der Geod Sie books, Vermessungskunde und Geodäsie ​hast sich die letzten Jahre zu einem Arbeitsgebiet entwickelt, das weniger die klassische Kartengrundlage nutzt, sondern vielmehr computerbaiserte Daten. Nach wie vor existieren die klassischen Anwendungen der Kartographie, Vermessung und des Katasterwesens, es interessieren jedoch heute auch GIS-gestützte Anwendungen sowie Fragestellungen, die sich aus Auswertungen von Satellitendaten ergeben.



How To Design Gps Gnss Receivers Books 2 3 4 5

How to Design GPS GNSS Receivers Books 2  3  4   5 PDF
Author: A. B. Lawal
Publisher: A. B. Lawal
ISBN:
Release: 2020-11-30
Size: 55.66 MB
Format: PDF
Category : Technology & Engineering
Languages : un
Pages : 903
View: 6074

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How To Design Gps Gnss Receivers Books 2 3 4 5 PDF Full

by A. B. Lawal, How To Design Gps Gnss Receivers Books 2 3 4 5 Books available in PDF, EPUB, Mobi Format. Download How To Design Gps Gnss Receivers Books 2 3 4 5 books, The objective of this book is to provide you the reader a complete systems engineering treatment of GNSS. I am an expert with practical experience in GPS/GNSS design and similar areas that are addressed within the book. I provide a thorough, in-depth treatment of each topic. In this book, updated information on GPS and GLONASS is presented. In particular, descriptions of new satellites, such as GPS III and GLONASS K2 and their respective signal sets (e.g., GPS III L1C and GLONASS L3OC), are included. In this combined volume I provide in-depth technical descriptions of each emerging satellite navigation system: BeiDou, Galileo, QZSS, and NavIC. Dedicated chapters cover each system’s constellation configuration, satellites, ground control system and user equipment. Detailed satellite signal characteristics are also provided. Recently, I’ve heard from many engineers that they learned how GPS receivers work from this title. In this title, the design is included, and treatment of receivers is updated and expanded in several important ways. New material has been added on important receiver components, such as antennas and front-end electronics. The increased complexity of multiconstellation, multifrequency receivers, which are rapidly becoming the norm today, is addressed in detail. Other added features of this title are the clear step-by-step design process and associated trades required to develop a GNSS receiver, depending on the specific receiver application. This subject will be of great value to those readers who need to understand these concepts, either for their own design tasks or to aid their satellite navigation system engineering knowledge. To round out the discussion of receivers, updated treatments of interference, ionospheric scintillation, and multipath are provided along with new material on blockage from foliage, terrain, and man-made structures. Now there has been major developments in GNSS augmentations, including differential GNSS (DGNSS) systems, Precise Point Positioning (PPP) techniques, and the use of external sensors/networks. The numerous deployed or planned satellite-based augmentation system (SBAS) networks are detailed, including WAAS, EGNOS, MSAS, GAGAN, and SDCM, as are groundbased differential systems used for various applications. The use of PPP techniques has greatly increased in recent years, and the treatment in this title has been expanded accordingly. Material addressing integration of GNSS with other sensors has been thoroughly revamped, as has the treatment of network assistance as needed to reflect the evolution from 2G/3G to 4G cellular systems that now rely on multiconstellation GNSS receiver engines. While this title has generally been written for the engineering/scientific community, one of the series is devoted to GNSS markets and applications. Marketing projections (and the challenge thereof) are enumerated and discussion of the major applications is provided. As in all the series, this book is structured such that a reader with a general science background can learn the basics of GNSS. The reader with a stronger engineering/scientific background will be able to delve deeper and benefit from the more in-depth technical material. It is this ramp-up of mathematical/technical complexity along with the treatment of key topics that enables this publication to serve as a student text as well as a reference source.



A Gps

A GPS PDF
Author: Frank Stephen Tromp Van Diggelen
Publisher: Artech House
ISBN: 1596933755
Release: 2009
Size: 70.96 MB
Format: PDF, Docs
Category : GNSS technology and applications series
Languages : un
Pages : 380
View: 4878

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A Gps PDF Full

by Frank Stephen Tromp Van Diggelen, A Gps Books available in PDF, EPUB, Mobi Format. Download A Gps books, Offering a detailed look at all the technical aspects and underpinnings of A-GPS, this unique book places emphasis on practical implementation. The book reviews standard GPS design, helping you understand why GPS requires assistance in the first place. You discover how A-GPS enables the computing of a position from navigation satellites in the absence of precise time - a topic not covered in any other book. Moreover, you learn how to design and analyze a high sensitivity GPS receiver and determine the achievable sensitivity. The book provides detailed worksheets that show how to compute, analyze, and improve the processing gain from the input signal at the antenna to the signal after the correlators. These worksheets are used in the book to generate families of curves that completely characterize receiver sensitivity, parameterized in terms of front end noise figure, coherent and noncoherent integration times. From this work a law of achievable sensitivity is derived and explained in the book.



Principles Of Gnss Inertial And Multisensor Integrated Navigation Systems

Principles of GNSS  Inertial  and Multisensor Integrated Navigation Systems PDF
Author: Paul David Groves
Publisher: GNSS Technology and Applicatio
ISBN:
Release: 2008
Size: 76.52 MB
Format: PDF, Mobi
Category : Technology & Engineering
Languages : en
Pages : 518
View: 4408

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Principles Of Gnss Inertial And Multisensor Integrated Navigation Systems PDF Full

by Paul David Groves, Principles Of Gnss Inertial And Multisensor Integrated Navigation Systems Books available in PDF, EPUB, Mobi Format. Download Principles Of Gnss Inertial And Multisensor Integrated Navigation Systems books, Navigation systems engineering is a red-hot area. More and more technical professionals are entering the field and looking for practical, up-to-date engineering know-how. This single-source reference answers the call, providing both an introduction to overall systems operation and an in-depth treatment of architecture, design, and component integration. The book explains how satellite, on-board, and other navigation technologies operate, and it gives practitioners insight into performance issues such as processing chains and error sources. Providing solutions to systems designers and engineers, the book describes and compares different integration architectures, and explains how to diagnose errors. Moreover, this hands-on book includes appendices filled with terminology and equations for quick referencing.



Global Navigation Satellite Systems Inertial Navigation And Integration

Global Navigation Satellite Systems  Inertial Navigation  and Integration PDF
Author: Mohinder S. Grewal
Publisher: John Wiley & Sons
ISBN: 1118523539
Release: 2015-03-11
Size: 69.84 MB
Format: PDF, ePub, Mobi
Category : Science
Languages : un
Pages : 608
View: 6893

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Global Navigation Satellite Systems Inertial Navigation And Integration PDF Full

by Mohinder S. Grewal, Global Navigation Satellite Systems Inertial Navigation And Integration Books available in PDF, EPUB, Mobi Format. Download Global Navigation Satellite Systems Inertial Navigation And Integration books, An updated guide to GNSS, and INS, and solutions to real-world GNSS/INS problems with Kalman filtering Written by recognized authorities in the field, this third edition of a landmark work provides engineers, computer scientists, and others with a working familiarity of the theory and contemporary applications of Global Navigation Satellite Systems (GNSS), Inertial Navigational Systems, and Kalman filters. Throughout, the focus is on solving real-world problems, with an emphasis on the effective use of state-of-the-art integration techniques for those systems, especially the application of Kalman filtering. To that end, the authors explore the various subtleties, common failures, and inherent limitations of the theory as it applies to real-world situations, and provide numerous detailed application examples and practice problems, including GNSS-aided INS (tightly and loosely coupled), modeling of gyros and accelerometers, and SBAS and GBAS. Drawing upon their many years of experience with GNSS, INS, and the Kalman filter, the authors present numerous design and implementation techniques not found in other professional references. The Third Edition includes: Updates on the upgrades in existing GNSS and other systems currently under development Expanded coverage of basic principles of antenna design and practical antenna design solutions Expanded coverage of basic principles of receiver design and an update of the foundations for code and carrier acquisition and tracking within a GNSS receiver Expanded coverage of inertial navigation, its history, its technology, and the mathematical models and methods used in its implementation Derivations of dynamic models for the propagation of inertial navigation errors, including the effects of drifting sensor compensation parameters Greatly expanded coverage of GNSS/INS integration, including derivation of a unified GNSS/INS integration model, its MATLAB® implementations, and performance evaluation under simulated dynamic conditions The companion website includes updated background material; additional MATLAB scripts for simulating GNSS-only and integrated GNSS/INS navigation; satellite position determination; calculation of ionosphere delays; and dilution of precision.



Gps And Gnss Technology In Geosciences

GPS and GNSS Technology in Geosciences PDF
Author: George P. Petropoulos
Publisher: Elsevier
ISBN: 0128196939
Release: 2021-02-18
Size: 56.97 MB
Format: PDF, ePub, Docs
Category : Science
Languages : un
Pages : 466
View: 5798

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Gps And Gnss Technology In Geosciences PDF Full

by George P. Petropoulos, Gps And Gnss Technology In Geosciences Books available in PDF, EPUB, Mobi Format. Download Gps And Gnss Technology In Geosciences books, GPS and GNSS Technology in Geosciences offers an interdisciplinary approach to applying advances in GPS/GNSS technology for geoscience research and practice. As GPS/GNSS signals can be used to provide useful information about the Earth’s surface characteristics and land surface composition, GPS equipment and services for commercial purposes continues to grow, thus resulting in new expectations and demands. This book provides case studies for a deeper understanding of the operation and principles of widely applied approaches and the benefits of the technology in everyday research and activities. Presents processing, methods and techniques of GPS/GNSS implementation that are utilized in in-situ data collection in design and systems analysis Offers an all-inclusive, critical overview of the state-of-the-art in different algorithms and techniques in GPS/GNSS Addresses both theoretical and applied research contributions on the use of this technology in a variety of geoscience disciplines



Das Sdr Praxisbuch

Das SDR Praxisbuch PDF
Author: Burkhard Kainka
Publisher:
ISBN: 9783895763380
Release: 2019-02-18
Size: 17.93 MB
Format: PDF, Mobi
Category :
Languages : en
Pages : 136
View: 981

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Das Sdr Praxisbuch PDF Full

by Burkhard Kainka, Das Sdr Praxisbuch Books available in PDF, EPUB, Mobi Format. Download Das Sdr Praxisbuch books,



Digital Satellite Navigation And Geophysics

Digital Satellite Navigation and Geophysics PDF
Author: Ivan G. Petrovski
Publisher: Cambridge University Press
ISBN: 0521760542
Release: 2012-03-29
Size: 16.51 MB
Format: PDF, ePub
Category : Technology & Engineering
Languages : un
Pages : 321
View: 3885

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Digital Satellite Navigation And Geophysics PDF Full

by Ivan G. Petrovski, Digital Satellite Navigation And Geophysics Books available in PDF, EPUB, Mobi Format. Download Digital Satellite Navigation And Geophysics books, Your hands-on guide to GNSS theory and applications, with practical case studies and bundled real-time software receiver and signal simulator.



Enhancing Satellite Navigation For Low Earth And Geostationary Orbit Missions

Enhancing Satellite Navigation for Low Earth and Geostationary Orbit Missions PDF
Author: Shankararaman Ramakrishnan
Publisher:
ISBN:
Release: 2019
Size: 79.28 MB
Format: PDF, ePub
Category :
Languages : un
Pages :
View: 1797

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Enhancing Satellite Navigation For Low Earth And Geostationary Orbit Missions PDF Full

by Shankararaman Ramakrishnan, Enhancing Satellite Navigation For Low Earth And Geostationary Orbit Missions Books available in PDF, EPUB, Mobi Format. Download Enhancing Satellite Navigation For Low Earth And Geostationary Orbit Missions books, The use of Global Positioning System (GPS) and upcoming Global Navigation Satellite System (GNSS) signals for Geostationary Orbit (GEO) and Highly Elliptical Orbit (HEO) space missions has special design challenges. Such missions are at an altitude above the altitude of the GNSS constellations. Consequently, the signals reaching an onboard receiver originate from GNSS satellites on the opposite side of Earth. The received signals are 10 to 100 times weaker with limited satellite spatial diversity. GNSS signal reception at GEO and beyond is dependent on accurately modelling the side lobes of the GNSS satellite transmit antenna array. Starting with the GPS Block III satellites, the GPS Interface Control Document (ICD) provides specifications on the gain characteristics of the main lobe of the transmit antenna array. There is no information in the literature that describes the side lobes of the transmit antenna pattern. Pictures of antennas onboard the Galileo Full Operational Capability (FOC) satellites indicates a transmit array of 28 patch antennas. No information can be found in the literature that characterizes the gain pattern for the Galileo FOC transmit antenna array. In this dissertation, GPS Block III and Galileo FOC transmit array main and side lobe gain patterns have been reversed engineered using computational electromagnetics. Using the reverse engineered transmit antenna gain patterns, satellite visibility and accuracy is evaluated onboard a GEO satellite using a combined GPS plus Galileo satellite constellation. Traditional ground-based satellite laser ranging has accuracy in the kilometer class. Leveraging both the main lobe and side lobes of a combined GPS plus Galileo constellation can result in at least two orders of improvement compared to ground-based approaches. Persistent autonomous RMS 3-D positioning accuracies of 9 -- 15 m can be achieved at GEO. Specular multipath resulting from the body structure and solar arrays is the dominant error source onboard Low Earth Orbit (LEO) satellites. In particular, solar panel induced specular reflections onboard the International Space Station (ISS) can cause up to 50m in GPS positioning error. Conventional multipath mitigation strategies are insufficient overcome this problem. In this work, a novel implementation of adaptive digital beamforming and predictive antenna nulling is demonstrated to overcome multipath. Using live sky data, a 4x decrease in positioning errors is achieved using a simple four element antenna array. A combined GPS + Galileo system is chosen to leverage the common L1 signal which will be transmitted by both constellations. Given the rather weak signal reception at GEO and beyond, custom signal acquisition algorithms are required. Such implementation cannot be found in commercial GNSS receivers. A real-time L1 C/A receiver with adaptive digital beamforming has been developed. The receiver has been implemented on the Xilinx Virtex-5QV rad-hard FPGA. To overcome the need for an external coprocessor, a dual core LEON3 processor has also been implemented within the same FPGA. Receiver performance and design methodologies adopted in its implementation are discussed in this thesis.



Global Navigation Satellite Systems

Global Navigation Satellite Systems PDF
Author: B. Bhatta
Publisher: BS Publications
ISBN: 8178002205
Release: 2010
Size: 78.84 MB
Format: PDF, ePub, Docs
Category : Artificial satellites in navigation
Languages : un
Pages : 438
View: 7151

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Global Navigation Satellite Systems PDF Full

by B. Bhatta, Global Navigation Satellite Systems Books available in PDF, EPUB, Mobi Format. Download Global Navigation Satellite Systems books, Chapter 1 Overview of GNSS Chapter 2 Functional Segments of GNSS Chapter 3 Working Principle of GNSS Chapter 4 GNSS Signals and Range Determination Chapter 5 Errors and Accuracy Issues Chapter 6 Positioning Methods Chapter 7 GNSS Augmentations and Other Navigation Satellite Systems Chapter 8 GNSS Receivers Chapter 9 Geodesy Chapter 10 Applications of GNSS Chapter 11 Surveying with GNSS Appendix A Mapping Issues Glossary References Index