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Radio Occultations Using Earth Satellites

Radio Occultations Using Earth Satellites

Author: William G. Melbourne

Publisher: Wiley-Interscience

ISBN: UOM:39015059221526

Category: Science

Page: 680

View: 200

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the wave theory foundations of today's radio occultation techniques Forty years ago, the premier radio occultation problem was how to profile the atmosphere and radius of Mars using signals sent by the Mariner 4 spacecraft. Researchers then could rely on ray theory-based techniques for accurate analysis of the thin, uniform Martian atmosphere. Today's radio occultation challenges mostly involve communications platforms—and related data, instrument systems, and applications—in the Earth's own atmosphere. To deal with the density and complexity of this multilayered medium, an analytical framework that goes beyond ray theory is needed. Setting the cutting edge for the field, Radio Occultations Using Earth Satellites: A Wave Theory Treatment develops a purely wave-theoretic approach to occultation analysis. This approach yields more nuanced results than either ray or hybrid (ray/wave) methodologies offer, and proves suitable for the many variables at work in today's problems. This groundbreaking text provides: An introduction to the general theory of radio occultations Development of ray theory and scalar diffraction treatments of radio propagation processes Development of a wave theoretic treatment of the above wave propagation processes The correspondence between wave and ray theories A discussion of how to use a wave-theoretic approach to infer the refractive properties of the propagation medium from a time series set of observations of the propagated wave's phase and amplitude A comprehensive resource that clearly defines the latest topics and methodologies, Radio Occultations Using Earth Satellites is a must-have text for engineers, scientists, students, and managers in satellites communications, navigation, deep space and planetary exploration, aerospace, atmospheric science, physics, and engineering. The Deep Space Communications and Navigation Series is authored by scientists and engineers with extensive experience in astronautics, communications, and related fields. It lays the foundation for innovation in the areas of deep space navigation and communications by disseminating state-of-the-art knowledge in key technologies.

Digital Satellite Navigation and Geophysics

Digital Satellite Navigation and Geophysics

Author: Ivan G. Petrovski

Publisher: Cambridge University Press

ISBN: 9781107376496

Category: Technology & Engineering

Page:

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Bridge the gap between theoretical education and practical work experience with this hands-on guide to GNSS, which features: • A clear, practical presentation of GNSS theory, with emphasis on GPS and GLONASS • All the essential theory behind software receivers and signal simulators • Key applications in navigation and geophysics, including INS aiding, scintillation monitoring, earthquake studies and more • Physical explanations of various important phenomena, including the similarity of code delay and phase advance of GNSS signals, and negative cross-correlation between scintillation intensity and phase variations. Whether you are a practising engineer, a researcher or a student, you will gain a wealth of insights from the authors' 25 years of experience. You can explore numerous practical examples and case studies and get hands-on user experience with a bundled real-time software receiver, signal simulator and a set of signal data, enabling you to create your own GNSS lab for research or study.

Radio Occultation Method for Remote Sensing of the Atmosphere and Ionosphere

Radio Occultation Method for Remote Sensing of the Atmosphere and Ionosphere

Author: Yuei-An Liou

Publisher: BoD – Books on Demand

ISBN: 9789537619602

Category: Science

Page: 178

View: 465

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The book is devoted to radio occultation (RO) remote sensing of the earth’s atmosphere and ionosphere as a global method of monitoring. This technique used the radio links satellite-to-satellite when a satellite-receiver setting or rising behind the earth’s atmosphere is relative to a satellite - emitter of radio waves. During setting the radio ray perigee moves through the ionosphere and ionosphere. Atmospheric and ionospheric effects arise in most cases owing to influence of a zone near the radio ray perigee and cause significant variations of the amplitude, phase, and frequency of the radio waves. These variations enable determination of the altitude profiles of temperature, pressure, refractivity, density, humidity and turbulence in the atmosphere, distribution of the electron density in the ionosphere, and the wave phenomena at different altitudes with a global coverage. The aim of this book consists of the systematic description of the different approaches, results of investigation and perspectives of the RO remote sensing as a tool for investigations of the atmosphere and ionosphere.

Springer Handbook of Global Navigation Satellite Systems

Springer Handbook of Global Navigation Satellite Systems

Author: Peter Teunissen

Publisher: Springer

ISBN: 9783319429281

Category: Science

Page: 1268

View: 721

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This Handbook presents a complete and rigorous overview of the fundamentals, methods and applications of the multidisciplinary field of Global Navigation Satellite Systems (GNSS), providing an exhaustive, one-stop reference work and a state-of-the-art description of GNSS as a key technology for science and society at large. All global and regional satellite navigation systems, both those currently in operation and those under development (GPS, GLONASS, Galileo, BeiDou, QZSS, IRNSS/NAVIC, SBAS), are examined in detail. The functional principles of receivers and antennas, as well as the advanced algorithms and models for GNSS parameter estimation, are rigorously discussed. The book covers the broad and diverse range of land, marine, air and space applications, from everyday GNSS to high-precision scientific applications and provides detailed descriptions of the most widely used GNSS format standards, covering receiver formats as well as IGS product and meta-data formats. The full coverage of the field of GNSS is presented in seven parts, from its fundamentals, through the treatment of global and regional navigation satellite systems, of receivers and antennas, and of algorithms and models, up to the broad and diverse range of applications in the areas of positioning and navigation, surveying, geodesy and geodynamics, and remote sensing and timing. Each chapter is written by international experts and amply illustrated with figures and photographs, making the book an invaluable resource for scientists, engineers, students and institutions alike.

Global Navigation Satellite System Monitoring of the Atmosphere

Global Navigation Satellite System Monitoring of the Atmosphere

Author: Guergana Guerova

Publisher: Elsevier

ISBN: 9780128191538

Category: Science

Page: 180

View: 801

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Global Navigation Satellite System (GNSS) monitoring of the atmosphere is an interdisciplinary topic: a collaboration between geodetic and atmospheric communities. As such, this topic requires sufficient basic knowledge about both GNSS and the atmosphere. Global Navigation Satellite System Monitoring of the Atmosphere begins by introducing GNSS, its components, and signals. It then explains the basics of the atmosphere, starting from the ionosphere to the troposphere. The GNSS tropospheric monitoring is separated for application in numerical weather prediction and nowcasting. Further chapters focus on the application of GNSS for monitoring the climate as well as soil moisture. Finally, the book concludes by discussing GNSS processing along with introducing the latest developments and applications for using atmospheric data to provide precise real-time GNSS products. Explains the basics of GNSS positioning and signals Includes the state of the art in GNSS observations of the atmosphere and hydrosphere Presents the basics of numerical weather prediction and analysis

Small Satellite Missions for Earth Observation

Small Satellite Missions for Earth Observation

Author: Rainer Sandau

Publisher: Springer Science & Business Media

ISBN: 9783642035012

Category: Technology & Engineering

Page: 455

View: 123

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This book was compiled from contributions given at the 7th IAA Symposium on Small Satellites for Earth Observation, May 4–8, 2009, Berlin (IAA – International Academy of Astronautics). From the 15 sessions for oral presentations and two poster sessions, 52 contributions were selected which are representative for the new developments and trends in the area of small satellites for Earth observation. They re ect the potentials of a diversity of missions and related technologies. This may be based on national projects or international co-operations, single satellites of constellations, pico-, nano-, micro- or mini-satellites, developed by companies, research institutions or agencies. The main focus is on new missions to monitor our Earth’s resources (Part I), and the environment in which our Earth is emb- ded (Part II). Part III deals with distributed space systems, a unique feature of small satellites and in most cases impractical to do with large satellites. Here we concentrate on constellations of satellites with focus on future missions relying on co-operating satellites. For all the new developments and projects we need well e- cated specialists coming from the universities. Many universities included already the development and implementation of small satellites in their curriculum. The u- versity satellites chapter (Part IV) shows the high quality which is already reached by some of the universities worldwide.

Estimating Electron Density of the Ionosphere from Radio Occultation TEC Data using Abel Inversion

Estimating Electron Density of the Ionosphere from Radio Occultation TEC Data using Abel Inversion

Author: Bizuayehu Adisie Beyene

Publisher: GRIN Verlag

ISBN: 9783656988069

Category: Science

Page: 17

View: 986

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Scientific Study from the year 2016 in the subject Physics - Nuclear Physics, Molecular Physics, Solid State Physics, grade: excellent, , language: English, abstract: Abstract Ionospheric electron density affects trans-ionospheric radio waves. Estimating electron density, therefore, is vital to mitigate the effect of ionosphere on radio waves. As a result, different methods have been applied to estimate ionospheric electron density from integrated measurements of ground-based GPS (Global Positioning System) receivers recently installed in East-Africa. To augment such efforts, ionospheric electron density has been estimated from Radio Occultation (RO) total electron content data measured by LEO (Low Earth Orbit) satellites. Abel inversion onion peeling algorithm then is used to retrieve electron density profiles from the calibrated data. The reconstructed electron density profiles have been validated by running the standard ionospheric empirical model (International Reference Ionosphere, IRI-2007) at time and locations that RO electron density profiles are obtained. The results show well agreement between the Abel inversion and IRI-2007 electron density profiles, for both bottom and topside ionosphere. Also, F2 peak density heights from Abel inversion and IRI-2007 have shown well agreement. However, significant discrepancy has been detected around the height of the F2 peak density.

Earth Observation with CHAMP

Earth Observation with CHAMP

Author: Christoph Reigber

Publisher: Springer Science & Business Media

ISBN: 9783540268000

Category: Science

Page: 628

View: 159

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In the summer of 2000 the German geo-research satellite CHAMP was launched into orbit. Its innovative payload arrangement and the low initial orbit allow CHAMP to simultaneously collect and almost continuously analyse precise data relating to gravity and magnetic fields at low altitude. In addition, CHAMP also measures the neutral atmosphere and ionosphere using GPS techniques. Three years after launch, more than 200 CHAMP investigators and co-investigators from all over the world met at the GeoForschungsZentrum in Potsdam to present and discuss the results derived from the extensive data sets of the mission. The main outcome of this expert meeting is summarized in this volume. The book offers a comprehensive insight into the present status of the exploitation of CHAMP data for Earth system research and practical applications in geodesy, geophysics and meteorology.

China Satellite Navigation Conference (CSNC 2021) Proceedings

China Satellite Navigation Conference (CSNC 2021) Proceedings

Author: Changfeng Yang

Publisher: Springer Nature

ISBN: 9789811631382

Category: Technology & Engineering

Page: 718

View: 873

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China Satellite Navigation Conference (CSNC 2021) Proceedings presents selected research papers from CSNC 2021 held during 22nd-25th May, 2021 in Nanchang, China. These papers discuss the technologies and applications of the Global Navigation Satellite System (GNSS), and the latest progress made in the China BeiDou System (BDS) especially. They are divided into 10 topics to match the corresponding sessions in CSNC2021 which broadly covered key topics in GNSS. Readers can learn about the BDS and keep abreast of the latest advances in GNSS techniques and applications.