Millimeter Wave And Synthetic Aperture Radar

DOWNLOAD

Download Millimeter Wave And Synthetic Aperture Radar PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Millimeter Wave And Synthetic Aperture Radar book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page

The Millimeter Wave Synthetic Aperture Radar Technology

DOWNLOAD
Author : Hui Wang
language : en
Publisher: Springer Nature
Release Date :

The Millimeter Wave Synthetic Aperture Radar Technology written by Hui Wang and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

Millimeter Wave And Synthetic Aperture Radar 27 28 March 1989 Orlando Florida

DOWNLOAD
Author : Gene Keith Huddleston
language : en
Publisher:
Release Date : 1989

Millimeter Wave And Synthetic Aperture Radar 27 28 March 1989 Orlando Florida written by Gene Keith Huddleston and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Technology & Engineering categories.

Millimeter Wave And Synthetic Aperture Radar

DOWNLOAD
Author : Gene Keith Huddleston
language : en
Publisher:
Release Date : 1989

Millimeter Wave And Synthetic Aperture Radar written by Gene Keith Huddleston and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Electronic books categories.

Ground Moving Target Indication With Millimeter Wave Synthetic Aperture Radar

DOWNLOAD
Author : Maurice Rüegg
language : en
Publisher:
Release Date : 2007

Ground Moving Target Indication With Millimeter Wave Synthetic Aperture Radar written by Maurice Rüegg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

Radar Sensor Technology Viii

DOWNLOAD
Author : Robert Neil Trebits
language : en
Publisher: SPIE-International Society for Optical Engineering
Release Date : 2004

Radar Sensor Technology Viii written by Robert Neil Trebits and has been published by SPIE-International Society for Optical Engineering this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Computers categories.

Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.

Optimized Techniques For Real Time Microwave And Millimeter Wave Sar Imaging

DOWNLOAD
Author : Joseph T. Case
language : en
Publisher:
Release Date : 2013

Optimized Techniques For Real Time Microwave And Millimeter Wave Sar Imaging written by Joseph T. Case and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Microwave devices categories.

"Microwave and millimeter wave synthetic aperture radar (SAR)-based imaging techniques, used for nondestructive evaluation (NDE), have shown tremendous usefulness for the inspection of a wide variety of complex composite materials and structures. Studies were performed for the optimization of uniform and nonuniform sampling (i.e., measurement positions) since existing formulations of SAR resolution and sampling criteria do not account for all of the physical characteristics of a measurement (e.g., 2D limited-size aperture, electric field decreasing with distance from the measuring antenna, etc.) and nonuniform sampling criteria supports sampling below the Nyquist rate. The results of these studies demonstrate optimum sampling given design requirements that fully explain resolution dependence on sampling criteria. This work was then extended to manually-selected and nonuniformly distributed samples such that the intelligence of the user may be utilized by observing SAR images being updated in real-time. Furthermore, a novel reconstruction method was devised that uses components of the SAR algorithm to advantageously exploit the inherent spatial information contained in the data, resulting in a superior final SAR image. Furthermore, better SAR images can be obtained if multiple frequencies are utilized as compared to single frequency. To this end, the design of an existing microwave imaging array was modified to support multiple frequency measurement. Lastly, the data of interest in such an array may be corrupted by coupling among elements since they are closely spaced, resulting in images with an increased level of artifacts. A method for correcting or pre-processing the data by using an adaptation of correlation canceling technique is presented as well"--Abstract, page iii.

Measurements Of The Radar Cross Section And Inverse Synthetic Aperture Radar Isar Images Of A Piper Navajo At 9 5 Ghz And 49 Ghz

DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1993

Measurements Of The Radar Cross Section And Inverse Synthetic Aperture Radar Isar Images Of A Piper Navajo At 9 5 Ghz And 49 Ghz written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.

Studies were conducted of the enhanced radar cross section (RCS) and improved inverse synthetic aperture radar (ISAR) image quality that may result at millimeter-wave (mmw) frequencies. To study the potential for mmw radar in these areas, a program was initiated in FY 90 to design and fabricate a 49.0- to 49.5-GHz stepped-frequency radar. After conducting simultaneous measurements of the RCS of an airborne Piper Navajo twin-engine aircraft at 9.0 and 49.0 GHz, the RCS at 49.0 GHz was always found to be higher than at 9.0 GHz by an amount that depended on the target aspect angle. The largest increase was 19 dB and was measured at nose-on incidence; at other angles of incidence, the increase ranged from 3 to 10 dB. The increase averaged over a 360-degree aspect-angle change was 7.2 dB. The 49.0-GHz radar has demonstrated a capability to gather well- calibrated millimeter-wave RCS data of flying targets. In addition, the successful ISAR images obtainable with short aperture time suggest that 49.0-GHz radar may have a role to play in noncooperative target identification (NCTI) ... Millimeter-wave(mmw) radar frequencies, Radar Cross Section(RCS) data, Inverse Synthetic Aperture Radar(ISAR) images.

Computational Imaging For Dynamic Metasurface Based Synthetic Aperture Radars

DOWNLOAD
Author : Sandamali Devadithya
language : en
Publisher:
Release Date : 2017

Computational Imaging For Dynamic Metasurface Based Synthetic Aperture Radars written by Sandamali Devadithya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.

In this thesis, computational imaging is used to improve millimeter-wave dynamic metasurface based synthetic aperture radar (SAR) imaging. SAR image reconstruction is a computationally complex inverse problem, which can be solved via a generalized inverse [e.g. full pseudoinverse (FPI)], or by means of approximation [e.g. matched filter (MF)]. However, approximation limits the resolution. In the first part of the thesis, a computationally efficient partitioned inverse (PI) algorithm for SAR image reconstruction is proposed. The independent partitions can be reconstructed in parallel using the matched filter or the pseudo inverse. A parallelized approach leveraging a graphics processing unit (GPU) is used to achieve a dramatic speedup compared to non-GPU accelerated algorithms. In the results presented in this thesis, PI algorithms are three orders magnitude faster than the FPI and two orders faster than the MF. The improved resolution of FPI is maintained by using the pseudo inverse to find the solutions for the PI. The partitioned pseudo inverse (PPI) algorithm is based on the Moore-Penrose pseudo inverse using truncated singular value decomposition for regularization. Optimal regularization ensures that the algorithm is robust to noise. It is shown that the PPI has an improved resolution of 24% over MF even at a signal to noise ratio (SNR) of 0 dB. Experimental results using a laboratory K-band (15-26.5 GHz) ultra-wideband SAR system are presented to validate the PI algorithms. The second part of the thesis focuses on SAR imaging with dynamic metasurface antennas (DMAs). An enhanced resolution stripmap mode (ERSM) SAR approach is extended for 3D imaging using DMA, where PI algorithms are used to accelarate the reconstruction. Experimental results using a commercial prototype DMA are presented. It is shown that the cross-range resolution and ground-range resolution has improved by 26% and 42% respectively when using 3D ERSM SAR. Furthermore, the PI reconstruction resulted in a 23.5X speedup over the MF. A limitation of using DMAs for SAR imaging are strong side lobes of the antenna, which causes the images to be smeared due to a distorted point spread function (PSF). It is shown that Lucy-Richardson deconvolution using a measured PSF can be applied to correct the smearing, achieve high resolution, and restore the image. Experimental results using a liquid-crystal based DMA for near field SAR imaging are presented, where the reconstructed images are restored using Lucy-Richardson deconvolution.

Millimeter Wave Imaging Using Mimo Sar Techniques

DOWNLOAD
Author : Muhammet Yanik
language : en
Publisher:
Release Date : 2020

Millimeter Wave Imaging Using Mimo Sar Techniques written by Muhammet Yanik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Coherent radar categories.

There is a strong desire to exploit the non-ionizing millimeter-wave (mmWave) spectrum (from 30 GHz to 300 GHz) in many high-resolution imaging applications ranging from medical to security. The primary challenge of a cost-effective and low-complexity mmWave imaging system is to achieve high-resolution with as few antenna elements as possible. Multiple input multiple-output (MIMO) radars using the simultaneous operation of spatially diverse transmit and receive antennas are good candidates to meet this challenge. On the other hand, higher integration complexity of extremely dense transceiver electronics limits the use of MIMO-only solutions within a relatively large imaging aperture. Hybrid concepts combining synthetic aperture radar (SAR) techniques and MIMO arrays present a great compromise to achieve short data acquisition time and low-complexity. Despite numerous studies that apply MIMO concepts to SAR techniques, the design process of a MIMO-SAR system is non-trivial, especially for mmWave imaging. Many issues have to be carefully addressed. Besides, compared with conventional monostatic sampling schemes, where the measurements are taken by collocated transmit and receive antennas, or MIMO-only solutions, efficient image reconstruction methods for MIMO-SAR topologies are more complicated in short-range applications. This dissertation introduces a complete mmWave imaging solution combining wideband MIMO arrays with SAR techniques, along with computationally efficient novel image reconstruction algorithms optimized for MIMO-SAR configurations. We present highly-integrated and reconfigurable MIMO-SAR testbeds utilizing commercially available complementary metal-oxide semiconductor (CMOS) based system-on-chip wideband MIMO mmWave sensors and motorized rail platforms. Several aspects of the MIMO-SAR testbed design process, including MIMO array calibration, electrical/mechanical synchronization, system-level verification, and performance evaluation, are described. The proposed algorithms are verified by both simulation and processing real data collected with custom-built imaging testbeds. The results confirm that our complete solution presents a strong potential in high-resolution imaging tasks of various real-world applications.

Hardware Architectures For Compact Microwave And Millimeter Wave Cameras

DOWNLOAD
Author : Matthew Jared Horst
language : en
Publisher:
Release Date : 2019

Hardware Architectures For Compact Microwave And Millimeter Wave Cameras written by Matthew Jared Horst and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

"Millimeter wave SAR imaging has shown promise as an inspection tool for human skin for characterizing burns and skin cancers. However, the current state-of-the-art in microwave camera technology is not yet suited for developing a millimeter wave camera for human skin inspection. Consequently, the objective of this dissertation has been to build the necessary foundation of research to achieve such a millimeter wave camera. First, frequency uncertainty in signals generated by a practical microwave source, which is prone to drift in output frequency, was studied to determine its effect on SAR-generated images. A direct relationship was found between the level of image distortions caused by frequency uncertainty and the product of frequency uncertainty and distance between the imaging measurement grid and sample under test. The second investigation involved the development of a millimeter wave imaging system that forms the basic building block for a millimeter wave camera. The imaging system, composed of two system-on-chip transmitters and receivers and an antipodal Vivaldi-style antenna, operated in the 58-64 GHz frequency range and employed the [omega]-k SAR algorithm. Imaging tests on burnt pigskin showed its potential for imaging and characterizing flaws in skin. The final investigation involved the development of a new microwave imaging methodology, named Chaotic Excitation Synthetic Aperture Radar (CESAR), for designing microwave and millimeter wave cameras at a fraction of the size and hardware complexity of previous systems. CESAR is based on transmitting and receiving from all antennas in a planar array simultaneously. A small microwave camera operating in the 23-25 GHz frequency was designed and fabricated based on CESAR. Imaging results with the camera showed it was capable of basic feature detection for various applications"--Abstract, page iv.