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Ionospheric Clutter Models For High Frequency Surface Wave Radar
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Book Synopsis Ionospheric Clutter Models for High Frequency Surface Wave Radar by : Shuyan Chen
Download or read book Ionospheric Clutter Models for High Frequency Surface Wave Radar written by Shuyan Chen and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High frequency surface wave radar (HFSWR), operating at frequencies between 3 and 30 MHz, has long been employed as an important ocean remote sensing device. These high frequency (HF) radars can provide accurate and real-time information for sea state monitoring and hard-target detection, which is greatly beneficial for planning and executing oceanographic projects, search and rescue events, and other commercial marine activities. Ideally, in HFSWR operation, the radio waves may be coupled with ocean waves and propagate along the curvature of the ocean surface with ranges well beyond 200 km. However, during transmission, a portion of the radar radiation may travel upwards to the ionosphere from the transmitting antenna. This may be partially reflected back to the receiving antennas directly (vertical propagation) or via the ocean surface (mixed-path propagation). This ionospheric clutter may significantly impact the performance of HFSWR. Furthermore, the high intensity and random behaviour of the ionospheric spectral contamination of radar echoes make the suppression of this kind of clutter challenging. In this thesis, comprehensive theoretical models of the ionospheric clutter are investigated. The physical influences of the ionospheric electron density on HF radar Doppler spectra are taken into account in the ionospheric reflection coefficient. Next, based on previous modeling involving the scattering of HF electromagnetic radiation from the ocean surface and a first-order mixed-path propagation theory, the second-order received electric field for mixed-path propagation is derived for a monostatic radar configuration. This is done by considering the reflection from the ionosphere and scattering on the ocean surface with second-order sea waves. Then, the field integrals are taken to the time domain, with the source field being that of a vertically polarized pulsed dipole antenna. Subsequently, the second-order received power model is developed by assuming that the ocean surface and the ionosphere may be modeled as stochastic processes. The ionospheric clutter model including a pulsed radar source is further investigated for the case of vertical propagation for a monostatic configuration and mixed-path propagation for a bistatic configuration. Next, a theoreticalmixed-path propagationmodel is developed by involving a frequencymodulated continuous waveform (FMCW) radar source. In order to investigate the power spectrum of the resulting ionospheric clutter and its relative intensity to that of the first-order ocean clutter, the normalized ionospheric clutter power is simulated. Numerical simulation results are provided to indicate the performance of the ionospheric clutter under a variety of radar operating parameters, ionospheric conditions and sea states.
Book Synopsis Mitigation of Ionospheric Effects on High Frequency Surface Wave Radar by :
Download or read book Mitigation of Ionospheric Effects on High Frequency Surface Wave Radar written by and published by . This book was released on 2006 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Frequency Surface Wave Radar (HFSWR) takes advantage of the di raction of electromagnetic waves over the conducting ocean surface to detect, locate, and track surface vessels beyond the line-of- sight horizon of the earth. However, long-range surface vessel detection is often confounded by radar clutter comprising echoes from the ionospheric plasma. In this paper, we characterize the angular spectrum of these re ections, and from this information deduce the signal-to-clutter processing gain that can be realized by various adaptive receive antenna array con gurations. In particular, it is shown that there is advantage to be realized by sampling ionospheric echoes with a planar two-dimensional array rather than a conventional linear one-dimensional HFSWR array. Using a planar array, the radar can distinguish high-elevation ionospheric clutter signals from low-elevation surface target echoes.
Book Synopsis Two-dimensional Adaptive Processing for Ionospheric Clutter Mitigation in High Frequency Surface Wave Radar by : R. J Riddolls
Download or read book Two-dimensional Adaptive Processing for Ionospheric Clutter Mitigation in High Frequency Surface Wave Radar written by R. J Riddolls and published by . This book was released on 2008 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Frequency Over-the-Horizon Radar by : Giuseppe Aureliano Fabrizio
Download or read book High Frequency Over-the-Horizon Radar written by Giuseppe Aureliano Fabrizio and published by McGraw Hill Professional. This book was released on 2013-07-09 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: THE MOST COMPLETE GUIDE TO HIGH FREQUENCY OVER-THE-HORIZON RADAR Written by a leading global expert on the topic, High Frequency Over-the-Horizon Radar provides in-depth coverage of the signal processing models and techniques that have significantly advanced OTH radar technology. This pioneering work describes the fundamental principles of OTH radar design and operation, and then delves into the mathematical modeling of HF signals received by actual OTH radar systems based on experimental data analysis. Numerous examples illustrate the practical application of modern adaptive signal processing techniques to real and simulated OTH radar data. This authoritative text covers skywave and surface-wave systems and is an invaluable resource for researchers, engineers, and practitioners working with OTH radar systems and technologies.
Book Synopsis A Model for High Frequency Radar Auroral Clutter by :
Download or read book A Model for High Frequency Radar Auroral Clutter written by and published by . This book was released on 1980 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model is developed to permit estimation of the effects of irregularities in the auroral ionosphere in producing clutter experienced by Over-The Horizon radars operating at high geomagnetic latitudes. The model is used on various sources of data, including auroral radar (HF, VHF, UHF), vertical incidence ionosondes, satellite particle detectors, and optical sensors (ground-based and satellite-borne). The model addresses both the amplitude and Doppler components of auroral radar clutter and also the effect of ionospheric refraction that is extremely important at high frequencies. Consideration is given to the question of predictability of the effects of auroral clutter on HF radar systems. An important component of the model is the incorporation of data from the Polar Fox II experiment conducted for the purpose of evaluating auroral clutter effects on OTH radars.
Book Synopsis Communications, Signal Processing, and Systems by : Qilian Liang
Download or read book Communications, Signal Processing, and Systems written by Qilian Liang and published by Springer Nature. This book was released on 2021-06-07 with total page 2070 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together papers presented at the 2020 International Conference on Communications, Signal Processing, and Systems, which provides a venue to disseminate the latest developments and to discuss the interactions and links between these multidisciplinary fields. Spanning topics ranging from communications, signal processing and systems, this book is aimed at undergraduate and graduate students in Electrical Engineering, Computer Science and Mathematics, researchers and engineers from academia and industry as well as government employees (such as NSF, DOD and DOE).
Book Synopsis Ocean-clutter Model for High-frequency Radar by :
Download or read book Ocean-clutter Model for High-frequency Radar written by and published by . This book was released on 1991 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inverse problem of extracting the ocean wave-length spectrum from the high-frequency (HF) radar clutter signal involves inventing a nonlinear integral equation. The strong ocean-clutter signal also eliminates the application of HF radar to target detection. This paper describes a detailed investigation of the time-varying behaviour of the ocean clutter and shows that the ocean-clutter can be modeled by two narrowband signals, with time-varying frequencies, centred around the two Bragg frequencies. It is demonstrated that the spectrum of such an angle-modulated signal agrees closely with the spectrum of HF radar data and accounts for the characteristics corresponding to both the first- and second-order scattering peaks.
Book Synopsis Global Clutter Model for HF Radars by : Roland T. Tsunoda
Download or read book Global Clutter Model for HF Radars written by Roland T. Tsunoda and published by . This book was released on 1997 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Global Clutter Model for HF Radars by : Roland T. Tsunoda
Download or read book Global Clutter Model for HF Radars written by Roland T. Tsunoda and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over-the-Horizon radars (OTHR) operating in the high frequency (HF) band are challenged by spread-Doppler clutter and blanketing sporadic E. Magnetic field-aligned irregularities imbedded in nighttime E layers are identified as a new source component of spread-Doppler clutter. In particular, observations of very high frequency (VHF) spread-Doppler signatures are explained in terms of a polarization electric field model which is applicable to HF as well. In addition, the seasonal morphology of sporadic E occurrence is explained in terms of the ionospheric electric field, which acts as the controlling factor over the metallic ion supply. Knowledge of this electric field will allow prediction of sporadic E occurrences.
Book Synopsis Issues in Electronics Research and Application: 2013 Edition by :
Download or read book Issues in Electronics Research and Application: 2013 Edition written by and published by ScholarlyEditions. This book was released on 2013-05-01 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Electronics Research and Application: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Radar and Sonar Research. The editors have built Issues in Electronics Research and Application: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Radar and Sonar Research in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Electronics Research and Application: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Book Synopsis Signal Processing Methods to Improve Ocean Surface Wave Estimation from a High Frequency Surface Wave Radar by :
Download or read book Signal Processing Methods to Improve Ocean Surface Wave Estimation from a High Frequency Surface Wave Radar written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Space Physics and Aeronomy, Ionosphere Dynamics and Applications by : Chao Huang
Download or read book Space Physics and Aeronomy, Ionosphere Dynamics and Applications written by Chao Huang and published by John Wiley & Sons. This book was released on 2021-05-11 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of global ionospheric research from the polar caps to equatorial regions It's more than a century since scientists first identified the ionosphere, the layer of the Earth’s upper atmosphere that is ionized by solar and cosmic radiation. Our understanding of this dynamic part of the near-Earth space environment has greatly advanced in recent years thanks to new observational technologies, improved numerical models, and powerful computing capabilities. Ionosphere Dynamics and Applications provides a comprehensive overview of historic developments, recent advances, and future directions in ionospheric research. Volume highlights include: Behavior of the ionosphere in different regions from the poles to the equator Distinct characteristics of the high-, mid-, and low-latitude ionosphere Observational results from ground- and space-based instruments Ionospheric impacts on radio signals and satellite operations How earthquakes and tsunamis on Earth cause disturbances in the ionosphere The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals. Find out more about the Space Physics and Aeronomy collection in this Q&A with the Editors in Chief
Book Synopsis THE EFFECTS OF IONOSPHERIC CHANGE ON HIGH FREQUENCY RADAR OBSERVATIONS by : Institute for Telecommunication Sciences and Aeronomy (U.S.)
Download or read book THE EFFECTS OF IONOSPHERIC CHANGE ON HIGH FREQUENCY RADAR OBSERVATIONS written by Institute for Telecommunication Sciences and Aeronomy (U.S.) and published by . This book was released on 1966 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Bistatic Radar by : Nicholas J. Willis
Download or read book Advances in Bistatic Radar written by Nicholas J. Willis and published by SciTech Publishing. This book was released on 2007-06-30 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive reference updates bistatic and multistatic radar developments since the publication of Nicholas Willis' seminal book Bistatic Radar published in 1991 and revised in 1995. The book is organized into two major sections: Bistatic/ Multistatic Radar Systems and Bistatic Clutter and Signal Processing. New and recently declassified military applications are documented. Civil applications are detailed for the first time, including commercial and scientific systems. Several of the most honored radar engineers of this era provide expertise in each of these applications. Professionals in radar and sonar will find this book a valuable resource
Book Synopsis Adaptive Filtering for Clutter Suppression in High Frequency Radar by :
Download or read book Adaptive Filtering for Clutter Suppression in High Frequency Radar written by and published by . This book was released on 1990 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: High frequency (HF) radar has the unique potential for over-the horizon detection of ocean surface targets. However, ocean waves are also strong reflections for HF radar and this high clutter level has limited its application for target detection. New results from the time domain analysis of ocean clutter show that it can be modelled as two angle modulated signals; this may be used to selectively suppress the clutter component, and enhance the target detection performance. The practical implementation of clutter suppression, based upon this model, involves tracking of multiple time-varying sinusoids. This paper discusses an adaptive filtering technique to track time-varying sinusoids and presents initial results.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 2023 International Conference on Marine Equipment & Technology and Sustainable Development by : Desen Yang
Download or read book 2023 International Conference on Marine Equipment & Technology and Sustainable Development written by Desen Yang and published by Springer Nature. This book was released on 2023-08-01 with total page 1258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains original, peer-reviewed, and selected research papers that were presented at the 2023 International Conference on Marine Equipment & Technology and Sustainable Development, which took place in Beijing, China on April 1st 2023. The papers cover a range of topics, including but not limited to: the vision and goals of building a maritime community with a shared future, marine machinery and transportation, marine ecology, environmental protection and conservation, marine safety, future ships and marine equipment, marine engineering, marine information and technology, maritime policy, and global governance. The papers included in this volume provide the latest findings on methodologies, algorithms, and applications in marine equipment and technology, as well as sustainable development. As a result, this book is an invaluable resource for researchers, engineers, and university students who are interested in these fields.
