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Author : Karl David Reinig
Publisher :
ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.:/5 (212 download)
Download or read book A dynamic radar backscatter simulation technique for detailed target models written by Karl David Reinig and published by . This book was released on 1993 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Karl D. Reinig
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (227 download)
Download or read book Rapid Backscatter Simulation Techniques for Detailed B-Spline Target Models written by Karl D. Reinig and published by . This book was released on 1988 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes a method for rapidly evaluating the simulated radar backscatter signatures of B-spline target models moving relative to a source/receiver. A geometric optics approach is used to estimate the radar return from a complex target surface described by a bicubic B-spline mesh. The method exploits the second-order continuity of bicubic B-spline surfaces to reduce the problem of finding all the specular points associated with each new trajectory position to that of tracking the motion of existing points. In particular, it is shown that the locations of the annihilations and creations of specular paths may be predicted for an entire trajectory, eliminating the need to search the whole surface for specular points as the target moves in relation to the source/receiver. The method is shown to work for the multiple-bounce case as well. The report contains several recommendations for further exploitation of the properties of B-spline surfaces for the tracking of specular points. (fr).
Author : Sergey A. Gorshkov
Publisher : Artech House Publishers
ISBN 13 : 9781580531719
Total Pages : 0 pages
Book Rating : 4.5/5 (317 download)
Download or read book Radar Target Backscattering Simulation written by Sergey A. Gorshkov and published by Artech House Publishers. This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collection of programs for the simulation of various properties of aerial targets.
Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)
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:
Author : C. W. Chuang
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.3/5 (91 download)
Download or read book Complex Natural Resonances of Radar Targets Via Prony's Method written by C. W. Chuang and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been shown that extraction of complex natural resonances and residues from exact transient responses via Prony's method is both efficient and accurate. However, in the art of radar interrogation the exact transient response is difficult to obtain and the authors must be content with an approximate one. Knowing the complex natural resonances of objects is essential to one type of radar target discrimination. In this paper the authors consider the use of Prony's method in extracting complex natural resonances from approximate backscattered ramp responses of radar targets. A ramp waveform is used in radar target discrimination because a good approximation to the time domain response can be obtained with only a few harmonically related frequency domain responses via Fourier synthesis. By applying Prony's method to this approximate ramp response, a few dominant resonances which are close to the origin of the complex frequency plane can be extracted. This is quite encouraging because for the purpose of radar target discrimination only a few dominant modes are needed. Objects considered are prolate spheroids, simple wire aircraft models and some realistic aircraft models. The accuracy of this method is found to be good when compared to the results obtained by other techniques.
Author : Jian Ping Li
Publisher : World Scientific
ISBN 13 : 9814471380
Total Pages : 1645 pages
Book Rating : 4.8/5 (144 download)
Download or read book Information Computing And Automation (In 3 Volumes) - Proceedings Of The International Conference written by Jian Ping Li and published by World Scientific. This book was released on 2008-04-25 with total page 1645 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wavelet analysis and its applications have become one of the fastest growing research areas in the past several years. Wavelet theory has been employed in many fields and applications, such as signal and image processing, communication systems, biomedical imaging, radar, air acoustics, and endless other areas. Active media technology is concerned with the development of autonomous computational or physical entities capable of perceiving, reasoning, adapting, learning, cooperating, and delegating in a dynamic environment.This book consists of carefully selected and received papers presented at the conference, and is an attempt to capture the essence of the current state-of-the-art in wavelet analysis and active media technology. Invited papers included in this proceedings includes contributions from Prof P Zhang, T D Bui, and C Y Suen from Concordia University, Canada; Prof N A Strelkov and V L Dol'nikov from Yaroslavl State University, Russia; Prof Chin-Chen Chang and Ching-Yun Chang from Taiwan; Prof S S Pandey from R D University, India; and Prof I L Bloshanskii from Moscow State Regional University, Russia.
Author :
Publisher :
ISBN 13 :
Total Pages : 1044 pages
Book Rating : 4.F/5 ( download)
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Moeness Amin
Publisher : CRC Press
ISBN 13 : 1351651382
Total Pages : 424 pages
Book Rating : 4.3/5 (516 download)
Download or read book Radar for Indoor Monitoring written by Moeness Amin and published by CRC Press. This book was released on 2017-09-14 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to capture recent advances and breakthroughs in in-home radar monitoring of human motions and activities. It addresses three key attributes of radar for in-door human monitoring, namely: motion classification including fall, detection of vital signs, and categorization of human gait for risk assessment and progression of physical impairments and disabilities. It explores recent developments in radar technology for human monitoring inside homes and residences. The reader will learn enhanced detection and classification techniques of radar signals associated with human micro- and macro-motions. Furthermore, the book includes examples using real data collected from healthy individuals, patients, and retirement communities based on the subject Doppler and range information, and using different single and multi-antenna radar system configurations. Results are also presented using modeled data based on biomechanics and kinematics. Indoor monitoring is further demonstrated using alternative technologies of infrared sensors and RF signals of opportunities.
Author : Peter H. Zipfel
Publisher : AIAA
ISBN 13 : 9781563474569
Total Pages : 586 pages
Book Rating : 4.4/5 (745 download)
Download or read book Modeling and Simulation of Aerospace Vehicle Dynamics written by Peter H. Zipfel and published by AIAA. This book was released on 2000 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: A textbook for an advanced undergraduate course in which Zipfel (aerospace engineering, U. of Florida) introduces the fundamentals of an approach to, or step in, design that has become a field in and of itself. The first part assumes an introductory course in dynamics, and the second some specialized knowledge in subsystem technologies. Practicing engineers in the aerospace industry, he suggests, should be able to cover the material without a tutor. Rather than include a disk, he has made supplementary material available on the Internet. Annotation copyrighted by Book News, Inc., Portland, OR
Author : Biswajeet Pradhan
Publisher : Springer
ISBN 13 : 3319542176
Total Pages : 337 pages
Book Rating : 4.3/5 (195 download)
Download or read book Spatial Modeling and Assessment of Urban Form written by Biswajeet Pradhan and published by Springer. This book was released on 2017-05-08 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the application of Geospatial data, Geographic Information System (GIS) and Remote Sensing (RS) technologies in analysis and modeling of urban growth process, and its pattern, with special focus on sprawl and compact form of urban development. The book explains these two kinds of urban forms (sprawl and compact urban development) in detail regarding their advantages, disadvantages, indicators, assessment, modeling, implementation and their relationship with urban sustainability. It confirms that the proposed modeling approaches, geospatial data and GIS are very practical for identifying urban growth, land use change patterns and their general trends in future. The analyses and modeling approaches presented in this book can be employed to guide the identification and measurements of the changes and growth likely to happen in urban areas. In addition, this book can be helpful for town planning and development in order to design urban areas in a compact form and eventually sustainable manner.
Author :
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.:/5 (317 download)
Download or read book Research and Technology Objectives and Plans Summary (RTOPS) written by and published by . This book was released on 1993 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 616 pages
Book Rating : 4.3/5 (91 download)
Download or read book CAD/CAM Abstracts written by and published by . This book was released on 1992 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xiaojie Fu
Publisher :
ISBN 13 :
Total Pages : 107 pages
Book Rating : 4.:/5 (112 download)
Download or read book Radar and Radar Imaging of Cooperative and Uncooperative Modulated Targets written by Xiaojie Fu and published by . This book was released on 2019 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radar and radar imaging technologies are widely used in the exploration of: (1) cooperative modulated targets that intentionally change their reflectivity to backscatter encoded signals, (2) uncooperative modulated targets that unintentionally modulate radar signals due to micro-motions, and (3) unmodulated targets that only reflect but do not modulate radar signals. In this work, a general model is proposed to encompass all three types of targets. This model unmasks the system frequency response when a general modulated target is included in the channel. It treats this target as a group of hypothesized point scatterers that modulate the radar signal with time-variant reflection coefficient values and time-variant point scatterer distribution. Additionally, the model accounts for stationary or moving radar platforms. This allows backscatter signals from different targets to be modeled and processed using the same framework. To use the model on cooperative targets, we first develop a low-cost X-band backscatter testbed and fabricate sensor tags used as cooperative targets. The system shows a good agreement between measured and simulated free-space path loss at up to 4.1 m and demonstrates a BPSK backscatter modulation at 10 Mbps. Then an extension of synthetic aperture radar (SAR) techniques is proposed to enable simultaneous imaging of reflective objects (unmodulated targets), sensor tag (cooperative target) localization, and backscatter data uplink from multiple tags in a cluttered environment. SAR measurements are implemented at 10 - 13 GHz with unmodulated targets and two sensor tags that monitor temperature changes and encode data with balanced orthogonal SAR code words in each packet. The resulting point-spread functions (PSFs) of tags at ranges of 4.4 m and 4.7 m demonstrate a range resolution of 4.7 cm, a cross-range resolution of 9.1 cm, and a maximum localization error of 9 mm. In addition, 1-bounce multipath ghosts (from a large reflective plane) of the tags are predicted by using virtual point scatterers with a maximum error of 1.4 cm. To apply the model on uncooperative targets, backscatter signal features of an off-the-shelf quadcopter UAV are extracted to characterize the reflectivity, static and dynamic radar cross sections, and the micro-Doppler signatures of the quadcopter using a custom K-band (15 - 26.5 GHz) laboratory radar system. The exploration of micro-Doppler signatures includes interference analysis between multiple spinning propellers and Doppler spectra analysis based on controlled rotation rate measurements. The magnitude of Doppler frequencies and Doppler bandwidth differ, even for a fixed rotation rate, and depend on the propeller orientations relative to the radar unit. In the modeling of a single propeller, such differences are explained by correlations between the simulated backscatter signals and the measured receive signals in different orientations. With only twelve point scatterers modeling the propeller, several sets of reflection coefficient values are found to reconstruct the measurement results with a maximum root mean square (RMS) error of 8 dB across all harmonic components in the asymmetric upper and lower sidebands.
Author : Joseph William Carl
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (178 download)
Download or read book Autoregressive Modeling Techniques for Radar Target Identification written by Joseph William Carl and published by . This book was released on 1987 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Louise C. Bickford
Publisher :
ISBN 13 :
Total Pages : 468 pages
Book Rating : 4.3/5 (91 download)
Download or read book Space Communications: Information processing and advanced techniques written by Louise C. Bickford and published by . This book was released on 1965 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 468 pages
Book Rating : 4.:/5 (317 download)
Download or read book Space Communications- Theory and Applications. Volume 3- Information Processing and Advanced Techniques a Bibliography, 1958 - 1963 written by and published by . This book was released on 1965 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John R. Hupton
Publisher :
ISBN 13 :
Total Pages : 218 pages
Book Rating : 4.:/5 (39 download)
Download or read book Three-dimensional Target Modeling with Synthetic Aperture Radar written by John R. Hupton and published by . This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional synthetic aperture radar (SAR) offers high-resolution imaging of a target region in the range and cross-range dimensions along the ground plane. Little or no data are available in the range-altitude dimension, however, and target functions and models are limited to two-dimensional images. This thesis first investigates some existing methods for the computation of target reflectivity data in the deficient elevation domain, and a new method is then proposed for three-dimensional (3-D) SAR target feature extraction. Simulations are implemented to test the decoupled least-squares technique for high-resolution spectral estimation of target reflectivity, and the accuracy of the technique is assessed. The technique is shown to be sufficiently accurate at resolving targets in the third axis, but is limited in practicality due to restrictive requirements on the input data. An attempt is then made to overcome some of the practical limitations inherent in the current 3-D SAR methods by proposing a new technique based on the direct extraction of 3-D target features from arbitrary SAR image inputs. The radar shadow present in SAR images of MSTAR vehicle targets is extracted and used in conjunction with the radar beam depression angle to compute physical target heights along the range axis. Multiple inputs of elevation data are then merged to forge rough 3-D target models.
