Dual-channel Airborne SAR Imaging of Ground Moving Targets on Perturbed Platform
Author: 吳道明
Publisher:
Published: 2023
Total Pages: 0
ISBN-13:
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Study on Ground Moving Target Indication and Imaging Technique of Airborne SAR
Author: Jian Yang
Publisher: Springer
Published: 2017-01-09
Total Pages: 122
ISBN-13: 9811030758
DOWNLOAD EBOOKBased on a detailed analysis of the signal model of the moving target, this thesis focuses on the theories and applications of ground moving target indicator (GMTI) and ground moving target imaging (GMTIm) algorithms in synthetic aperture radar/ ground moving target indicator (SAR/GMTI mode), wide-area surveillance ground moving target indication (WAS-GMTI) mode and frequency modulated continuous wave synthetic aperture radar (FMCW SAR) systems. The proposed algorithms can not only indicate and image fast-moving targets, but are also effective in the context of slow-moving target processing. The system design scheme combines the mechanical scanning mode and the airborne SAR system, while the azimuth moving target indication algorithm employs the additional range walk migration induced by FMCW SAR systems. In addition, the non-ideal errors that deteriorate the performance of GMTIm algorithms in real SAR data processing are discussed, and suitable compensation methods are provided.>
Passive Synthetic Aperture Radar Imaging of Ground Moving Targets
Author: Steven Wacks
Publisher:
Published: 2014
Total Pages: 268
ISBN-13:
DOWNLOAD EBOOKTracking Moving Ground Targets from Airborne SAR Via Keystoning and Multiple Phase Center Interferometry
Author:
Publisher:
Published: 2006
Total Pages: 7
ISBN-13:
DOWNLOAD EBOOKWithout some form of motion compensation, SAR images experience significant range walk and be quite blurred. In 1997, MITRE reported development of the Keystone Process Keystone Formatting simultaneously compensates for multiple target motion at multiple radial velocities. The target motion causes the moving targets to appear at locations different from their true instantaneous locations on the ground. In a corresponding interferometric phase image, all points on the ground nominally appear as a continuum of phase differences while the moving targets appear as discontinuities. By threshold comparisons within the intensity and the phase images, we and others have shown that it is possible to detect and georegister moving targets in the SAR.
Imaging from Spaceborne and Airborne SARs, Calibration, and Applications
Author: Masanobu Shimada
Publisher: CRC Press
Published: 2018-10-26
Total Pages: 377
ISBN-13: 1315282607
DOWNLOAD EBOOKSixty 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.
Estimation of the Velocity Vector of Moving Targets from SAR Images
Author: Andrea Radius
Publisher: LAP Lambert Academic Publishing
Published: 2014-05
Total Pages: 120
ISBN-13: 9783659535536
DOWNLOAD EBOOKThe SAR (Synthetic Aperture Radar) is a radar which acquires synthesized images with high resolution independently from the weather conditions; for these reasons the SAR plays an important role in remote sensing, when high resolution and temporal continuity are required. In the past, SAR systems main goals were the study of the interaction between electromagnetic waves and the Earth surface. Quickly the intrinsic capability of this instrument to analyze the dynamic characteristics of the observed objects and the changes of the requirements of the users made the SAR particularly fit for moving target detection in commercial, surveillance and strategic context. The development of recent multi-channel SAR systems enables the development of sophisticated techniques for the surveillance of moving objects, making this field very active research area. This book addresses this particular problem by presenting an analysis of the effects of the moving targets in SAR images and by proposing two methodologies to estimate the velocity vector of objects in motion.
Detection of Ground Moving Objects with Synthetic Aperture Radar
Author: Ishuwa C. Sikaneta
Publisher:
Published: 2004
Total Pages: 274
ISBN-13:
DOWNLOAD EBOOKA Model for Forming Airborne Synthetic Aperture Radar Images of Underground Targets
Author:
Publisher:
Published: 1994
Total Pages: 56
ISBN-13:
DOWNLOAD EBOOKSynthetic Aperture Radar (SAR) from an airborne platform has been proposed for imaging targets beneath the earth's surface. The propagation of the radar's energy within the ground, however, is much different than in the earth's atmosphere. The result is signal refraction, echo delay, propagation losses, dispersion, and volumetric scattering. These all combine to make SAR image formation from an airborne platform much more challenging than a surface imaging counterpart. This report treats the ground as a lossy dispersive half-space, and presents a model for the radar echo based on measurable parameters. The model is then used to explore various imaging schemes, and image properties. Dynamic range is discussed, as is the impact of loss on dynamic range. Modified window functions are proposed to mitigate effects of sidelobes of shallow targets overwhelming deeper targets.
Geosynchronous SAR: System and Signal Processing
Author: Teng Long
Publisher: Springer
Published: 2018-04-20
Total Pages: 299
ISBN-13: 981107254X
DOWNLOAD EBOOKThis 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.
Multi-Antenna Synthetic Aperture Radar
Author: Wen-Qin Wang
Publisher: CRC Press
Published: 2017-07-12
Total Pages: 468
ISBN-13: 1466510528
DOWNLOAD EBOOKSynthetic aperture radar (SAR) is a well-known remote sensing technique, but conventional single-antenna SAR is inherently limited by the minimum antenna area constraint. Although there are still technical issues to overcome, multi-antenna SAR offers many benefits, from improved system gain to increased degrees-of-freedom and system flexibility. Multi-Antenna Synthetic Aperture Radar explores the potential and challenges of using multi-antenna SAR in microwave remote sensing applications. These applications include high-resolution imaging, wide-swath remote sensing, ground moving target indication, and 3-D imaging. The book pays particular attention to the signal processing aspects of various multi-antenna SAR from a top-level system perspective. Explore Recent Extensions of Synthetic Aperture Radar Systems The backbone of the book is a series of innovative microwave remote sensing approaches developed by the author. Centered around multi-antenna SAR imaging, these approaches address specific challenges and potential problems in future microwave remote sensing. Chapters examine single-input multiple-output (SIMO) multi-antenna SAR, including azimuth and elevation multi-antenna SAR, and multiple-input multiple-output (MIMO) SAR. The book details the corresponding system scheme, signal models, time/phase/spatial synchronization methods, and high-precision imaging algorithms. It also investigates their potential applications. Introductory Tutorials and Novel Approaches in Multi-Antenna SAR Imaging Rigorous and self-contained, this is a unique reference for researchers and industry professionals working with microwave remote sensing, SAR imaging, and radar signal processing. In addition to novel approaches, the book also presents tutorials that serve as an introduction to multi-antenna SAR imaging for those who are new to the field.
