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Author : M. J. Tucker
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (111 download)
Download or read book The Use of Synthetic Aperture Radar (SAR) to Measure Waves written by M. J. Tucker and published by . This book was released on 1981 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. A. Shuchman
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (228 download)
Download or read book The Use of Synthetic Aperture Radar (SAR) to Measure Ocean Gravity Waves written by R. A. Shuchman and published by . This book was released on 1982 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reviews the use of synthetic aperture radar (SAR) to detect water gravity waves. SAR data, collected by aircraft and satellites during a series of oceanographic experiments, have been used to demonstrate the ability of this imaging remote sensor to measure water gravity waves in a variety of sea states. For example, wave refraction was successfully documented in the coastal regions near Cape Hatteras, North Carolina, using Seasat SAR satellite data. SAR has also been successfully used to measure internal gravity waves and long-period surf beats. Several parameters determine the visibility of gravity waves in SAR images: radar wavelengths and polarization, angle of incidence and radar look direction (relative to the wave propagation direction), as well as ocean wavelength, wave height, and wind speed and direction. In general, waves traveling toward or away from the SAR line of sight are more visible in the imagery than waves traveling perpendicular to the SAR line of sight. (Author).
Author : Hui Wang
Publisher : Springer Nature
ISBN 13 : 9819710448
Total Pages : 368 pages
Book Rating : 4.8/5 (197 download)
Download or read book The Millimeter Wave Synthetic Aperture Radar Technology written by Hui Wang and published by Springer Nature. This book was released on with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charles V. J. Jakowatz
Publisher : Springer Science & Business Media
ISBN 13 : 1461313333
Total Pages : 431 pages
Book Rating : 4.4/5 (613 download)
Download or read book Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach written by Charles V. J. Jakowatz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern airborne and spaceborne imaging radars, known as synthetic aperture radars (SARs), are capable of producing high-quality pictures of the earth's surface while avoiding some of the shortcomings of certain other forms of remote imaging systems. Primarily, radar overcomes the nighttime limitations of optical cameras, and the cloud- cover limitations of both optical and infrared imagers. In addition, because imaging radars use a form of coherent illumination, they can be used in certain special modes such as interferometry, to produce some unique derivative image products that incoherent systems cannot. One such product is a highly accurate digital terrain elevation map (DTEM). The most recent (ca. 1980) version of imaging radar, known as spotlight-mode SAR, can produce imagery with spatial resolution that begins to approach that of remote optical imagers. For all of these reasons, synthetic aperture radar imaging is rapidly becoming a key technology in the world of modern remote sensing. Much of the basic `workings' of synthetic aperture radars is rooted in the concepts of signal processing. Starting with that premise, this book explores in depth the fundamental principles upon which the spotlight mode of SAR imaging is constructed, using almost exclusively the language, concepts, and major building blocks of signal processing. Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach is intended for a variety of audiences. Engineers and scientists working in the field of remote sensing but who do not have experience with SAR imaging will find an easy entrance into what can seem at times a very complicated subject. Experienced radar engineers will find that the book describes several modern areas of SAR processing that they might not have explored previously, e.g. interferometric SAR for change detection and terrain elevation mapping, or modern non-parametric approaches to SAR autofocus. Senior undergraduates (primarily in electrical engineering) who have had courses in digital signal and image processing, but who have had no exposure to SAR could find the book useful in a one-semester course as a reference.
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 : United States. Interagency Ad Hoc Working Group on SAR.
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (318 download)
Download or read book Operational Use of Civil Space-based Synthetic Aperture Radar (SAR) written by United States. Interagency Ad Hoc Working Group on SAR. and published by . This book was released on 1996 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hans Hellsten
Publisher : Artech House
ISBN 13 : 1630814466
Total Pages : 367 pages
Book Rating : 4.6/5 (38 download)
Download or read book Meter-Wave Synthetic Aperture Radar for Concealed Object Detection written by Hans Hellsten and published by Artech House. This book was released on 2017-05-31 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique resource presents the principles of meter wave ground imaging radar focusing on foliage penetration. Scattering of VHF/UHF radar signals are presented including the basic laws of electromagnetism, homogeneous media, media discontinuities/non-flat media discontinuities, and ground reflectivity. The book introduces meter wavelength synthetic aperture radar, bandwidth, and SAR imaging principles, including moving objects and also compares collected SAR data. Meter wavelength SAR system design and processing is explored, highlighting low frequency SAR design aspects, characterization of additive noise, antenna system basics, waveforms and emission adaptation which is critical material to the advancement in sensors and signal processing for below ground imaging by the energy industry and governments worldwide. The FFBP method of processing, explicit treatment of base 2 FFBP is explained along with motion errors sensitivity and motion estimation methods. The book also explains the Bayesian change detection, covariance moving target extraction and polarimetric subsurface imaging.
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 : Nelson Violante-Carvalho
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783838334257
Total Pages : 144 pages
Book Rating : 4.3/5 (342 download)
Download or read book The Use of Ers Sar for Measurement of the Directional Wave Spectrum written by Nelson Violante-Carvalho and published by LAP Lambert Academic Publishing. This book was released on 2010-05 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study presented in this work examines the use of Synthetic Aperture Radar (SAR) on-board the first European Remote Sensing Satellite (ERS-1) for the measurement of wind waves and discusses its applications such as wave data assimilation and inverse modelling. Over four years of directional measurements acquired by a heave-pitch-roll buoy moored in tropical deep waters around 150 km offshore are employed to investigate the mechanisms of SAR wave imaging and the retrievals of wave spectra from SAR images. For the first time the most widely implemented Max-Planck Institut (MPI) SAR Wave Mode retrieval scheme was assessed through detailed statistical intercomparisons and selected qualitative validations against directional buoy data and against the third generation wave model WAM data, which was used as first guess to the inversion. The performance of the WAM model, the ECMWF Atmospheric Model and of the Maximum Entropy Method for the retrieval of the buoy directional spectrum are also discussed through several cross-validation exercises.
Author : Diane L. Evans
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (317 download)
Download or read book Spaceborne Synthetic Aperture Radar written by Diane L. Evans and published by . This book was released on 1995 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bovenga Fabio
Publisher : Mdpi AG
ISBN 13 : 9783039361229
Total Pages : 340 pages
Book Rating : 4.3/5 (612 download)
Download or read book Synthetic Aperture Radar (SAR) Techniques and Applications written by Bovenga Fabio and published by Mdpi AG. This book was released on 2020-06-15 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of its ability to sense the Earth's surface at night and during the day, under any weather condition, Synthetic Aperture Radar (SAR) has become a well-established and powerful remote sensing technology that is used worldwide for numerous applications. This book compiles 19 research works that investigate different aspects of SAR processing, SAR image analysis, and SAR applications. The contributions cover topics related to multi-angle/wide-angle SAR imaging; Doppler parameter estimation; data-driven focusing; Inverse SAR (ISAR) applied to pulsar signal modeling and detection; ground-based SAR; near-field interferometric ISAR; the interaction between SAR signals and the Infosphere; SAR interferometry for ground displacement monitoring, feature extraction, and change detection; and SAR-based sea applications. The selected studies represent real examples of the abundant research ongoing in the field of SAR processing and applications, and they further demonstrate that SAR imaging still presents considerable opportunities for future investigation.
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 : Huimin Li
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)
Download or read book Global Observations of Ocean Surface Winds and Waves Using Spaceborne Synthetic Aperture Radar Measurements written by Huimin Li and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spaceborne synthetic aperture radar (SAR) has been demonstrated invaluable in observing the global ocean winds and waves. SAR images acquired by multiple sensors are employed, including Sentinel-1(S-1), Envisat/ASAR, Gaofen-3 and Radarsat-2. This thesis reviews the commonly used SAR parameters (NRCS and azimuth cutoff) in the first part. A series of calibration steps are required to obtain a proper NRCS and assessment of NRCS is carried out for S-1wave mode (WV). It turns out that WV is poorly calibrated and is thus re-calibrated to obtain accurate NRCS. Azimuth cut off is demonstrated to be complementary to NRCS and can account for the sea state impact on the wind retrieval. Based on the available fully polarimetric SAR products, azimuth cut off is found to vary greatly with polarizations. The present SAR mapping transformation is sufficient to interpret the co-polarized azimuth cut off, while not for the cross-polarization. With the limitations of SAR imaging in mind, a new parameter is proposed and defined based on the SAR image cross-spectra, termed as MACS. The imaginary part of MACS is found to be a signed quantity relative to the wind direction. Given this dependence, an independent wind retrieval algorithm is expected to benefit. The magnitude of MACS is able to aid for estimate of modulation function of SAR mapping. In addition, MACS also gives promising results regarding the global wave studies. The global signatures of MACS at various wave lengths are well representative of the winds distributions, spatially and seasonally. MACS of long waves shows greater values over the storm tracks while the shorter waves are mostly within the trader winds. These results are expected to help evaluate the model outputs and complement further studies of the global wave spectral climate. Data continuity in the coming 10 years shall extend the study towards longer duration.
Author : Didier Massonnet
Publisher : CRC Press
ISBN 13 : 1439808139
Total Pages : 298 pages
Book Rating : 4.4/5 (398 download)
Download or read book Imaging with Synthetic Aperture Radar written by Didier Massonnet and published by CRC Press. This book was released on 2008-05-01 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describing a field that has been transformed by the recent availability of data from a new generation of space and airborne systems, the authors offer a synthetic geometrical approach to the description of synthetic aperture radar, one that addresses physicists, radar specialists, as well as experts in image processing.
Author : Chris Oliver
Publisher : SciTech Publishing
ISBN 13 : 1891121316
Total Pages : 510 pages
Book Rating : 4.8/5 (911 download)
Download or read book Understanding Synthetic Aperture Radar Images written by Chris Oliver and published by SciTech Publishing. This book was released on 2004 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical reference shows SAR system designers and remote sensing specialists how to produce higher quality SAR images using data-driven algorithms, and apply powerful new techniques to measure and analyze SAR image content.
Author : Teng Long
Publisher : Springer
ISBN 13 : 981107254X
Total Pages : 299 pages
Book Rating : 4.8/5 (11 download)
Download or read book Geosynchronous SAR: System and Signal Processing written by Teng Long and published by Springer. This book was released on 2018-04-20 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book chiefly addresses the analysis and design of geosynchronous synthetic aperture radar (GEO SAR) systems, focusing on the algorithms, analysis, methods used to compensate for ionospheric influences, and validation experiments for Global Navigation Satellite Systems (GNSS). Further, it investigates special problems in the GEO SAR context, such as curved trajectories, the Earth’s rotation, the ‘non-stop-and-go’ model, high-order Doppler parameters, temporal-variant ionospheric errors etc. These studies can also be extended to SAR with very high resolution and long integration time. Given the breadth and depth of its coverage, scientists and engineers in SAR and advanced graduate students in related areas will greatly benefit from this book.
Author : Robert O. Harger
Publisher :
ISBN 13 :
Total Pages : 264 pages
Book Rating : 4.3/5 (91 download)
Download or read book Synthetic Aperture Radar Systems written by Robert O. Harger and published by . This book was released on 1970 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
