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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
Previously, a novel formulation for the generation of three-dimensional (3D) inverse synthetic aperture radar (ISAR) images based on recent developments in high resolution spectral estimation theory was presented. Because this technique requires only "snapshots" of data, where a "snapshot" is defined as a block of Nyquist sampled frequency-time pulses of data, we refer to it as "3D snapshot imaging." Concomitant with these results, recent advances in interferometric SAR imaging have demonstrated the use of two-dimensional (2D) range-Doppler image phase information to extract "out-of-plane" height information to obtain 3D images of ground scenes. In this case, a unique sampling grid is generated that allows "overlaying" of nearly identical 2D range-Doppler images and uses phase differences between these images to estimate the "out-of-plane" height information, from which a 3D image is developed. In this report, we develop a framework connecting these two techniques, particularly applicable to forming 3D images of target types typically dominated by smaller numbers (
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
Previously, a novel formulation for the generation of three-dimensional (3D) inverse synthetic aperture radar (ISAR) images based on recent developments in high resolution spectral estimation theory was presented. Because this technique requires only "snapshots" of data, where a "snapshot" is defined as a block of Nyquist sampled frequency-time pulses of data, we refer to it as "3D snapshot imaging." Concomitant with these results, recent advances in interferometric SAR imaging have demonstrated the use of two-dimensional (2D) range-Doppler image phase information to extract "out-of-plane" height information to obtain 3D images of ground scenes. In this case, a unique sampling grid is generated that allows "overlaying" of nearly identical 2D range-Doppler images and uses phase differences between these images to estimate the "out-of-plane" height information, from which a 3D image is developed. In this report, we develop a framework connecting these two techniques, particularly applicable to forming 3D images of target types typically dominated by smaller numbers (
Author: Joseph T. Mayhan
Publisher: MIT Press
ISBN: 0262048116
Category : Computers
Languages : en
Pages : 513
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Book Description
A high-level text that synthesizes diverse research areas for characterizing objects (targets) from radar data and establishes a novel analysis framework for a class of signal processing techniques useful for high-resolution radar signature modeling. The only text to integrate a diverse body of work on characterizing objects (targets) from radar data into a common analysis framework, this book brings together the results of research papers and technical reports providing improved resolution and precision in radar target signature modeling and target motion solutions. It offers comprehensive coverage related to basic radar concepts, signal representation, and radar measurements; the development of advanced analysis tools essential for high-resolution signature modeling; the development of novel wideband and narrowband radar imaging techniques; the application of 2D spectral estimation theory to wideband signal processing; ultra-wideband scattering phenomenology and sparse-band sensor data fusion; and the integration of field measurements into the radar signature modeling process. The analysis techniques developed in the text provide the framework for a novel approach, called measurements-based modeling (MBM), to model target signatures by incorporating measurement data into the signature model of the target. Extensive examples throughout compare the performance of the new techniques with that of conventional analysis techniques. The first systematic, comprehensive synthesis of wide-ranging research areas for characterizing targets from radar data A deeply researched, lucid presentation enriched by extensive illustrations and examples An essential reference for experts in radar and signal processing, professional engineers in related fields, and graduate students
Author: Charles N. Adams
Publisher:
ISBN: 9781423501688
Category :
Languages : en
Pages : 150
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Book Description
Inverse Synthetic Aperture Radar (ISAR) provides full-range detection and classification of sea-based and air-based targets through two-dimensional range-Doppler imaging. The Naval Postgraduate School (NPS) has developed a custom integrated circuit that can simulate false ISAR images in order to fool enemy ISAR platforms. To validate specific hardware choices within this design, this thesis explores the effect on image quality of an overflow occurring within the final 16-bit summation adder of this circuit, Three solutions to the problem of overflows are presented and analyzed. The logical extension of ISAR development, that of three-dimensional target imaging, is next presented through the discussion of 3D monopulse radar, 3D interferometer ISAR, and a 3D, three- receiver ISAR. The relative strengths of each approach are compared, along with both MATLAB and Extensible 3D (X3D) Graphics software models created for one specific 3D ISAR implementation. Through the superposition of 2D ISAR images it is shown how 3D ISAR images may be created. Moreover, emphasis is placed on using this knowledge to both enhance current 2D ISAR techniques and to modify the false-target chip design to handle 3D ISAR return signals. The thesis concludes with a study of Non-Uniform Rational 13-Splines, through which the X3D software model was created.
Author: Hui Wang
Publisher: Springer Nature
ISBN: 9819710448
Category :
Languages : en
Pages : 368
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Book Description
Author: Achim Hein
Publisher: Springer Science & Business Media
ISBN: 3662094576
Category : Science
Languages : en
Pages : 302
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Book Description
Written for students, remote sensing specialists, researchers and SAR system designers, Processing of SAR Data shows how to produce quality SAR images. In particular, this practical reference presents new methods and algorithms concerning the interferometric processing of SAR data with emphasis on system and signal theory, namely how SAR imagery is formed, how interferometry SAR images are created, and a detailed mathematical description of different focussing algorithms. Starting with the processing basics and progressing to the final geo-coded SAR data product, the book describes the complete processing steps in detail. Algorithms based on the effects of side-looking geometry are developed to correct foreshortening, shadowing and layover.
Author: Masanobu Shimada
Publisher: CRC Press
ISBN: 1315282607
Category : Technology & Engineering
Languages : en
Pages : 377
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Book Description
Sixty years after its birth, Synthetic Aperture Radar (SAR) evolved as a key player of earth observation, and it is continually upgraded by enhanced hardware functionality and improved overall performance in response to user requirements. The basic information gained by SAR includes the backscattering coefficient of targets, their phases (the truncated distance between SAR and its targets), and their polarization dependence. The spatiotemporal combination of the multiple data operated on the satellite or aircraft significantly increases its sensitivity to detect changes on earth, including temporal variations of the planet in amplitude and the interferometric change for monitoring disasters; deformations caused by earthquakes, volcanic activity, and landslides; environmental changes; ship detection; and so on. Earth-orbiting satellites with the appropriate sensors can detect environmental changes because of their large spatial coverage and availability. Imaging from Spaceborne and Airborne SARs, Calibration, and Applications provides A-to-Z information regarding SAR researches through 15 chapters that focus on the JAXA L-band SAR, including hardware description, principles of SAR imaging, theoretical description of SAR imaging and error, ScanSAR imaging, polarimetric calibration, inflight antenna pattern, SAR geometry and ortho rectification, SAR calibration, defocusing for moving targets, large-scale SAR imaging and mosaic, interferometric SAR processing, irregularities, application, and forest estimation. Sample data are created by using L-band SAR, JERS-1, PALSAR, PALSAR-2, and Pi-SAR-L2. This book is based on the author’s experience as a principal researcher at JAXA with responsibilities for L-band SAR operation and researches. It reveals the inside of SAR processing and application researches performed at JAXA, which makes this book a valuable reference for a wide range of SAR researchers, professionals, and students.
Author: Neil T. Forrester
Publisher:
ISBN:
Category :
Languages : en
Pages : 139
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Book Description
A frequently useful technique in the interpretation of Inverse Synthetic Aperture Radar (ISAR) images is to construct a three dimensional (3D) model of the object being imaged. Generally, such models are constructed manually by an analyst based on a series of radar images and whatever other information is available. However, using multistatic radar, it is possible to generate 3D Interferometric ISAR (IFSAR) point cloud images. In this thesis, two original techniques for automatically generating models of rigid bodies from IFSAR point clouds are explored. One technique extends the concept of the visual hull to a composite point cloud. The other uses a noise resistant estimator to determine the shape of the side of the object presented to the radar. Noise and radar artifacts show up strongly in the data, and both techniques must reject them to achieve good performance. Additionally, an optimization-based algorithm was devised to determine the angular velocity of a target using only one interferometric baseline. Knowing the angular velocity of the target is necessary to correctly scale the axes of ISAR images and IFSAR point clouds. Though techniques exist for angular velocity determination using multiple baselines, receiving antennas are expensive and are not always available. The techniques presented in this thesis were tested against simulated data and data collected in a compact range. The angular velocity determination technique was successfully demonstrated on simulated IFSAR data, using a particular heuristic enforcing the consistency of rotational motion. Investigation into a more robust heuristic is necessary to make the approach broadly effective. The surface reconstruction algorithm based on the noise resistant estimator performs very well, doing much better than a traditional algorithm selected for comparison (3D a-shapes) in high noise situations. The technique based on the visual hull, while producing faithful reconstructions in some cases, generally offers performance inferior to the noise resistant estimator. Quantitative measurements were used to evaluate the fidelity of the models generated by the various techniques.
Author: A. Thiele
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1044
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Book Description
Author: Piotr Samczynski
Publisher: MDPI
ISBN: 3036509186
Category : Technology & Engineering
Languages : en
Pages : 394
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Book Description
The aim of this Printed Edition of Special Issue entitled "Recent Advancements in Radar Imaging and Sensing Technology” was to gather the latest research results in the area of modern radar technology using active and/or radar imaging sensing techniques in different applications, including both military use and a broad spectrum of civilian applications. As a result, the 19 papers that have been published highlighted a variety of topics related to modern radar imaging and microwave sensing technology. The sequence of articles included in the Printed Edition of Special Issue dealt with wide aspects of different applications of radar imaging and sensing technology in the area of topics including high-resolution radar imaging, novel Synthetic Apertura Radar (SAR) and Inverse SAR (ISAR) imaging techniques, passive radar imaging technology, modern civilian applications of using radar technology for sensing, multiply-input multiply-output (MIMO) SAR imaging, tomography imaging, among others.
