Multipath Mitigation Performance of Planar GPS Adaptive Antenna Arrays for Precision Landing Ground Stations PDF Download

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9

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Author: Jari Nurmi
Publisher: Springer
ISBN: 9400718306
Category : Technology & Engineering
Languages : en
Pages : 406

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This book covers multi-band Galileo receivers (especially E1-E5 bands of Galileo) and addresses all receiver building blocks, from the antenna and front end, through details of the baseband receiver processing blocks, up to the navigation processing, including the Galileo message structure and Position, Velocity, Time (PVT) computation. Moreover, hybridization solutions with communications systems for improved localization are discussed and an open-source GNSS receiver platform (available for download) developed at Tampere University of Technology (TUT) is addressed in detail.

Author: Chad Slick
Publisher:
ISBN:
Category : Adaptive antennas
Languages : en
Pages : 452

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Abstract: The current state-of-the-art adaptive antennas for Global Positioning System (GPS) receivers are planar antenna arrays. Due to the planar nature of these antenna arrays, the resolution with respect to the elevation plane is limited if the antenna is mounted in a horizontal plane. The nulls formed by the adaptive antenna in response to low elevation radio frequency interference (RFI) signals extend significantly into the elevation plane resulting in performance degradation. One solution to combat this problem is to use non-planar adaptive antennas with GPS receivers. The non-planar adaptive antenna can exploit its geometry to provide RFI suppression against low elevation interfering signals while maintaining reception of low angle signals of interest (SOI) to yield highly accurate Position, Velocity, and Time (PVT) solutions. It will be shown that convex non-planar antenna arrays perform significantly better than planar antenna arrays as well as concave non-planar antenna arrays in the presence of low elevation RFI signals. Also, an increase in the curvature of the antenna array will result in AJ performance improvement. All antenna arrays studied in this thesis have similar projected area (looking from the top) relative to the current state-of- the-art planar adaptive antenna (GAS-1 CRPA). Moreover, the convex non-planar antenna arrays contains more surface area allowing the addition of more antenna elements resulting in further performance improvement. The antenna element used in this study is a dual stacked microstrip patch antenna designed to operate at the L1(1575.42 MHz) and L2(1227.6 MHz) GPS frequencies. Rigorous electromagnetic (EM) modeling, which takes into account mutual coupling of antenna elements and array structure, of the various antenna arrays is performed to obtain the in situ volumetric patterns of the individual antenna elements. This thesis also focuses on determining the optimum number of elements as well as their distributions based upon antenna array performance for a fixed aperture size of a six inch high and two inch high convex non-planar adaptive antenna. The antenna arrays investigated have a single constraint to have the reference element distributed at the top of the convex surface to provide upper hemispherical coverage. The adaptive antenna performance is evaluated with respect to the adaptive algorithms of simple power minimization and beam forming / null steering. The performance metrics are the output Signal-to-Interference plus Noise Ratio (SINR) and the average available region over the upper hemisphere for which the output SINR exceeds a selected value in the presence of multiple interfering signals, where the average value is obtained by performing Monte Carlo simulations. It will be shown that for the six inch high surface, it is better to distribute the antenna elements along two rings, with the inner ring at an angle of 450 from the centroid (a height of 4.24"), and the other ring along the bottom outer edge of the hemisphere. However, if less surface area is available, as is the case with the two inch high surface, it is best to distribute the remaining elements on the periphery of the antenna array. Furthermore, it will be shown that when adaptive antenna is operating in the beam forming / null steering mode the addition of more elements always leads to improved performance; however, this does not hold true when the adaptive antenna is operating in the simple power minimization mode.

Author: Elliott D. Kaplan
Publisher: Artech House Mobile Communicat
ISBN:
Category : Transportation
Languages : en
Pages : 738

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Appendix B:Stability Measures for Frequency Sources 665Appendix C:Free-Space Propagation Loss 669; About the Authors 675; Index 683; Mobile Communications Library.

Author: Scott Pace
Publisher: RAND Corporation
ISBN:
Category : Fiction
Languages : en
Pages : 438

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A comprehensive assessment of the challenges and opportunities created by worldwide access to this revolutionary technology.

Author: Huadong Guo
Publisher: Springer Nature
ISBN: 9813299150
Category : Technology & Engineering
Languages : en
Pages : 846

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Book Description
This open access book offers a summary of the development of Digital Earth over the past twenty years. By reviewing the initial vision of Digital Earth, the evolution of that vision, the relevant key technologies, and the role of Digital Earth in helping people respond to global challenges, this publication reveals how and why Digital Earth is becoming vital for acquiring, processing, analysing and mining the rapidly growing volume of global data sets about the Earth. The main aspects of Digital Earth covered here include: Digital Earth platforms, remote sensing and navigation satellites, processing and visualizing geospatial information, geospatial information infrastructures, big data and cloud computing, transformation and zooming, artificial intelligence, Internet of Things, and social media. Moreover, the book covers in detail the multi-layered/multi-faceted roles of Digital Earth in response to sustainable development goals, climate changes, and mitigating disasters, the applications of Digital Earth (such as digital city and digital heritage), the citizen science in support of Digital Earth, the economic value of Digital Earth, and so on. This book also reviews the regional and national development of Digital Earth around the world, and discusses the role and effect of education and ethics. Lastly, it concludes with a summary of the challenges and forecasts the future trends of Digital Earth. By sharing case studies and a broad range of general and scientific insights into the science and technology of Digital Earth, this book offers an essential introduction for an ever-growing international audience.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1016

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Author: Mohinder S. Grewal
Publisher: John Wiley & Sons
ISBN: 0470099712
Category : Science
Languages : en
Pages : 416

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An updated guide to GNSS and INS, and solutions to real-world GPS/INS problems with Kalman filtering Written by recognized authorities in the field, this second edition of a landmark work provides engineers, computer scientists, and others with a working familiarity with the theory and contemporary applications of Global Navigation Satellite Systems (GNSS), Inertial Navigational Systems (INS), 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, 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. This Second Edition has been updated to include: GNSS signal integrity with SBAS Mitigation of multipath, including results Ionospheric delay estimation with Kalman filters New MATLAB programs for satellite position determination using almanac and ephemeris data and ionospheric delay calculations from single and dual frequency data New algorithms for GEO with L1 /L5 frequencies and clock steering Implementation of mechanization equations in numerically stable algorithms To enhance comprehension of the subjects covered, the authors have included software in MATLAB, demonstrating the working of the GNSS, INS, and filter algorithms. In addition to showing the Kalman filter in action, the software also demonstrates various practical aspects of finite word length arithmetic and the need for alternative algorithms to preserve result accuracy.

Author: Enrico Re
Publisher: Springer Science & Business Media
ISBN: 0387475249
Category : Technology & Engineering
Languages : en
Pages : 752

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Satellite Communications and Navigation Systems publishes the proceedings of the 2006 Tyrrhenian International Workshop on Digital Communications. The book focuses on the integration of communication and navigation systems in satellites.

Author: Mohinder S. Grewal
Publisher: John Wiley & Sons
ISBN: 1118523539
Category : Science
Languages : en
Pages : 441

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Book Description
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.