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Author : Craig Leonard Agne
Publisher :
ISBN 13 :
Total Pages : 170 pages
Book Rating : 4.:/5 (716 download)
Download or read book Ocean Wave Parameter Estimation Using Limited Synthetic Aperture Radar Data written by Craig Leonard Agne and published by . This book was released on 1980 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gordon E. Carlson
Publisher :
ISBN 13 :
Total Pages : 181 pages
Book Rating : 4.:/5 (196 download)
Download or read book Estimation of Oceanwave Wavenumber and Propagation Direction from Limited Synthetic Aperture Radar Data written by Gordon E. Carlson and published by . This book was released on 1981 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: A system for determining wavenumber and propagation direction for the dominant ocean wave component from a few scans of synthetic aperture radar data is described and analyzed. The analysis uses actual synthetic aperture radar data and provides system parameter tradeoffs and statistical performance results. While reasonable estimates of wavenumber and propagation direction are achieved in some cases, the estimates are not sufficiently consistent to be satisfactory over a wide range of cases. The primary problem is one of low signal-to-noise ratio of the radar scan data. (Author).
Author : Al-Abbass Y. Al-Habashneh
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (132 download)
Download or read book Enhanced Methods of Ocean Wave Spectra and Sea State Parameter Estimation from X-band Marine Radar Data written by Al-Abbass Y. Al-Habashneh and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the ocean's importance in human lives, researchers have been studying the ocean and developing systems to estimate its state since the 19th century. During the last three decades, remote sensing of the ocean surface using X-band marine radars has emerged as a reliable tool to estimate ocean wave spectra and sea state parameters such as mean wave period and direction and significant wave height. The purpose of this thesis is to develop methods that produce accurate and reliable estimates of ocean wave spectra using X-band marine radar data. The approach taken in this thesis is to determine the sources of ocean wave spectra estimation error in existing methods and then to develop new methods that minimize those errors. In this thesis, four sources of error are addressed: the dependency of spectra estimation on the orientation of the analysis windows; the effect of the radar sampling process; the effect of the scan conversion process; and the accuracy of surface current estimation. The azimuthal location of the X-band radar data analysis window affects the estimation of ocean wave spectra. it has been reported in the literature, and supported by our results, that using the up-wave directions for analysis windows produces higher signal to noise ratios and hence more accurate ocean wave spectra estimates. In order to minimize error due to dependency on the orientation of the analysis windows, a new method referred to as the Adaptive Recursive Positioning Method (ARPM) is proposed. The ARPM is a recursive approach that dynamically determines the optimal number of analysis windows and their corresponding orientation toward the up-wave directions. Second, in this thesis, it has been demonstrated that the sampling process of the ocean surface by X-band marine radar during data collection significantly affects the estimation of ocean save spectra from X-band marine radar data. Therefore, a method referred to as the Inverse Sampling Averaging Filter (ISAF) is proposed to mitigate the effect of the radar sampling process of the ocean surface on the ocean wave spectra estimation using X-band marine radars. ISAF was designed based on a novel understanding of the radar sampling process to involve an averaging process or low pass filtering of the ocean wave spectra. Third, in this thesis, a method referred to as the Polar Fourier Transform (PFT) is proposed to eliminate the distortion presented by the scan conversion process to the estimated wave spectra. Unlike the existing methods which use the Cartesian Fourier Transform (CFT) to acquire the ocean wave spectra, the PFT method is designed to apply a Fourier-type transformation on the radar data in its native format, which is sampled in the polar coordinates, without the need for the intermediate stage of scan conversion used to map the data into Cartesian coordinates. The performance of the proposed methods, the ARPM,ISAF and PFT, are individually validated by comparing their ocean wave spectra estimates to those acquired using the existing methods with respect to ground truth wave spectra acquired using a wave rider buoy. Furthermore, the proposed methods were also combined together to seek further enhancement. The wave spectra estimation results from different combinations of the proposed methods were validated in comparison to the ground truth data. Finally, a new method to estimate surface current using X-band marine radar is proposed. This method is referred to as the Hybrid Least Squares (HLS) method. The HLS combines two existing approaches: the Iterative Least Squares (ILS) method and the Normalized Scalar Product (NSP). The HLS is designed to inherit the short computational time of ILS and the high reliability of NSP. To validate its accuracy and reliability, the proposed HLS method was applied on a number of simulated X-band marine radar image sets and the results were compared to the estimates acquired using the ILS and the NSP.
Author : Mikhail B. Kanevsky
Publisher : Elsevier
ISBN 13 : 0080932517
Total Pages : 207 pages
Book Rating : 4.0/5 (89 download)
Download or read book Radar Imaging of the Ocean Waves written by Mikhail B. Kanevsky and published by Elsevier. This book was released on 2008-09-15 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to studying the ocean with radar tools, in particular, with space radars. Being intended mainly for the scientists preoccupied with the problem (as well as senior course students), it concentrates and generalizes the knowledge scattered over specialized journals. The significant part of the book contains the results obtained by the author. Systematically collects and describes the approaches used by different laboratories and institutions Deals with the physics of radar imagery and specifically with ocean surface imagery Useful for students and researchers specializing in the area of ocean remote sensing using airborne or space-borne radars, both SAR and RAR
Author : Maged Marghany
Publisher : Elsevier
ISBN 13 : 0128209259
Total Pages : 464 pages
Book Rating : 4.1/5 (282 download)
Download or read book Nonlinear Ocean Dynamics written by Maged Marghany and published by Elsevier. This book was released on 2021-02-09 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear Ocean Dynamics: Synthetic Aperture Radar delivers the critical tools needed to understand the latest technology surrounding the radar imaging of nonlinear waves, particularly microwave radar, as a main source to understand, analyze and apply concepts in the field of ocean dynamic surface. Filling the gap between modern physics quantum theory and applications of radar imaging of ocean dynamic surface, this reference is packed with technical details associated with the potentiality of synthetic aperture radar (SAR). The book also includes key methods needed to extract the value-added information necessary, such as wave spectra energy, current pattern velocity, internal waves, and more. This book also reveals novel speculation of a shallow coastal front: named as Quantized Marghany's Front. Rounding out with practical simulations of 4-D wave-current interaction patterns using using radar images, the book brings an effective new source of technology and applications for today’s coastal scientists and engineers. Solves specific problems surrounding the nonlinearity of ocean surface dynamics in synthetic aperture radar data Helps develop new algorithms for retrieving ocean wave spectra and ocean current movements from synthetic aperture radar Includes over 100 equations that illustrate how to follow examples in the book
Author :
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (946 download)
Download or read book Wave-Coherence Measurements Using Synthetic Aperture Radar written by and published by . This book was released on 2000 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: A critical issue in the design of large floating structures such as those being considered in the Mobile Offshore Base (MOB) effort currently being pursued by the U.S. Navy is the nature of the ocean-wave field viewed on scales of 2 km or more. Of prime concern is the ability to assess the spatial coherence of the wave field or the probability of occurrence of long, unbroken wave crests for various environmental conditions. This report describes an effort to use satellite-based synthetic-aperture radar images to determine the crest-length statistics for ocean waves. The first portion of the study examined the feasibility of using SAR image data to determine the crest length distribution, which was shown the be directly related to the directional spread of the spectrum. A fully nonlinear SAR model was used in a simulation study to assess the impact of imaging effects on the resulting measures. For the cases examined, the errors in estimated directional spread were generally less than 20-30% and were conservative when the SAR look direction was within 200 of the propagation direction. The errors were shown to increase with increasing significant wave height, increasing directional spread, and increasing angle between the wave propagation direction and the SAR look direction. The second portion of the study developed a methodology to estimate the wave spectrum directly from the SAR-image spectrum via a variational inversion procedure. The methodology was successful, and the results from ERS SAR data indicate that errors in spectral parameters such as the mean wave length and directional spread are strongly dependent on the signal to noise ratio, as measured by the peak image spectral density. Errors become large when the peak spectral density falls below about 10 sq m for ERS SAR data. Above this level, estimates of wave length arid directional spread are accurate to within about 10-20%.
Author : Hany Mohamed Assal
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (318 download)
Download or read book Measurements of Ocean Surface Waves Using Synthetic Aperture Radar written by Hany Mohamed Assal and published by . This book was released on 1981 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Johannes Schulz-Stellenfleth
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (249 download)
Download or read book Ocean Wave Measurements Using Complex Synthetic Aperture Radar Data written by Johannes Schulz-Stellenfleth and published by . This book was released on 2003 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wade Shafer
Publisher : Springer Science & Business Media
ISBN 13 : 1461337003
Total Pages : 335 pages
Book Rating : 4.4/5 (613 download)
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 26 (thesis year 1981) a total of 11 ,048 theses titles from 24 Canadian and 21 8 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 26 reports theses submitted in 1981, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Author : F. A. Ientile
Publisher :
ISBN 13 :
Total Pages : 326 pages
Book Rating : 4.:/5 (221 download)
Download or read book Spectral Estimation and Modelling of Ocean Waves from Synthetic Aperture Radar written by F. A. Ientile and published by . This book was released on 1992 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xinlong Liu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (132 download)
Download or read book Ocean Wind and Wave Parameter Estimation from Ship-borne X-band Marine Radar Data written by Xinlong Liu and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean wind and wave parameters are important for the study of oceanography, on- and off-shore activities, and the safety of ship navigation. Conventionally, such parameters have been measured by in-situ sensors such as anemometers and buoys. During the last three decades, sea surface observation using X-band marine radar has drawn wide attention since marine radars can image both temporal and spatial variations of the sea surface. In this thesis, novel algorithms for wind and wave parameter retrieval from X-band marine radar data are developed and tested using radar, anemometer, and buoy data collected in a sea trial off the east coast of Canada in the North Atlantic Ocean. Rain affects radar backscatter and leads to less reliable wind parameters measurements. In this thesis, algorithms are developed to enable reliable wind parameters measurements under rain conditions. Firstly, wind directions are extracted from raincontaminated radar data using either a 1D or 2D ensemble empirical mode decomposition (EEMD) technique and are seen to compare favourably with an anemometer reference. Secondly, an algorithm based on EEMD and amplitude modulation (AM) analysis to retrieve wind direction and speed from both rain-free and rain-contaminated X-band marine radar images is developed and is shown to be an improvement over an earlier 1D spectral analysis-based method. For wave parameter measurements, an empirical modulation transfer function (MTF) is required for traditional spectral analysis-based techniques. Moreover, the widely used signal-to-noise ratio (SNR)-based method for significant wave height (HS) estimation may not always work well for a ship-borne X-band radar, and it requires external sensors for calibration. In this thesis, two methods are first presented for HS estimation from X-band marine radar data. One is an EEMD-based method, which enables satisfactory HS measurements obtained from a ship-borne radar. The other is a modified shadowingbased method, which enables HS measurements without the inclusion of external sensors. Furthermore, neither method requires the MTF. Finally, an algorithm based on the Radon transform is proposed to estimate wave direction and periods from X-band marine radar images with satisfactory results.
Author : Robert A. Shuchman
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (81 download)
Download or read book Analysis of Synthetic Aperture Radar Ocean Wave Data Collected at Marineland and Georges Bank written by Robert A. Shuchman and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (713 download)
Download or read book Estimation of Temporally Evolving Typhoon Winds and Waves from Synthetic Aperture Radar written by and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term goal of this project is to develop a methodology for using synthetic aperture radar (SAR) data to improve characterization of the winds and waves generated by typhoons in the western Pacific Ocean. The specific objective of the project is to develop a variational assimilation algorithm based on the SWAN model to estimate the near-surface typhoon wind field from SAR data. Third-generation wave spectrum models such as SWAN can be used to predict wind-generated waves. Combining SWAN and a model relating the SAR-image spectrum to the computed wave spectrum, one can predict the SAR-image spectrum which results from a known wind field. Using variational data assimilation, this relationship can be inverted to estimate the wind field from SAR data. The focus of this effort is to extend an existing SAR assimilation algorithm to enable the estimation of surface wind fields from SAR data. An assimilation algorithm has been developed to estimate the ocean-wave field for a near-shore region for stationary conditions using SAR data. The algorithm is variational in nature and is based on the SWAN 40.51 ocean-wave-spectrum model coupled to the nonlinear SAR-spectrum model of Hasselmann and Hasselmann. For this case, the algorithm is used to estimate the boundary conditions for SWAN that result in a wave-spectrum prediction which best fits the SAR data.
Author :
Publisher :
ISBN 13 :
Total Pages : 692 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (3 download)
Download or read book NASA SP. written by and published by . This book was released on 1962 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Guiting Song
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783843367745
Total Pages : 124 pages
Book Rating : 4.3/5 (677 download)
Download or read book Statistical Analysis of Global Ocean Wave and Wind Parameters written by Guiting Song and published by LAP Lambert Academic Publishing. This book was released on 2011-04 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost all of the breakthroughs in understanding the ocean have been initiated by observations, using a range of instrumental techniques. Nowadays, satellite application is a good answer to the common requirement of meteorology and oceanography for comprehensive information on the ocean and atmosphere. Many different instruments have been installed on earth observation satellites. Among them the synthetic aperture radar (SAR) is the only instrument which up to now can provide high-resolution, two dimensional sea surface information on a global scale. Written as a comprehensive introduction to the techniques of SAR application into ocean for the oceanographic scientist, research student or undergraduate. It focuses on the systematic validation and comparison of met-ocean parameters like significant wave height, wind speed and mean wave period obtained from ERS SAR image using empirical algorithms, in situ and satellite observations, reanalysis and model results.
Author : Robert A. Shuchman
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (227 download)
Download or read book Problems of Imaging Ocean Waves with Synthetic Aperture Radar written by Robert A. Shuchman and published by . This book was released on 1977 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress is reported on three tasks designed to provide information to evaluate the operational use of SAR, so that ultimately, meaningful ocean shallow-water wave spectra and coastal wave height information can be supplied to the Navy in real-time. Under Task 1, a limited literature search was conducted to ascertain problems encountered in imaging sea states with SAR. The search indicated four fundamental problem areas where basic research is needed, before SAR can become a useful tool for the Navy. Under Task 2, solutions to SAR signal processing problems were explored and geometrical coorections of SAR wave imagery were considered.
