Download or read book Microwave Imaging Radar Reflectometer Receiver System Utilizing Digital Beam Forming written by Fengqi Hu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the exponentially increasing energy requirements and the serious environmental problems caused by traditional fossil sources have drawn tremendous attention to the development of alternative energy sources. One of the most promising candidates is nuclear fusion energy. To study the fundamental physical phenomena inside the confined hot plasma of which the temperatures are in excess of 100 million Kelvin, advanced imaging systems are being developed with millimeter wave imaging systems of particular importance. The Microwave Imaging Reflectometry (MIR) developed at UC Davis is an active radar imaging system used to measure the electron density fluctuations. In the currently employed system, carefully designed optical lenses are used to shape the probing beam so that it would impinge upon the plasma cutoff surface with normal incidence. On the receiver side, another set of lenses are used to collect and further shape the beam to form an image of the cutoff surface. The focusing is done by motor controlled lenses, which not only take up more space but also are slow to adjust compared to many plasma times of interest. Phased array synthesis offers the ability to change the shaping and steering of the beam electronically for fast-tracking and remote tuning without the need for bulky lenses. Based on where in the system the phase shifting is performed, there are two major categories of phased array. One is the analog phased array where the beam shaping and steering are done in the analog domain with analog phase shifters. The other approach is digital beamforming where the amplitude scaling and the phase shifting are realized by mathematical operations in the digital domain. Compared to its analog counterpart, digital beam forming could be done much faster with great flexibility. The focus of this dissertation is the utilization of digital beam forming to realize high speed focusing with greater flexibility. The beam shaping, focusing/de-focusing, beam steering and beam translation with digital beam forming are demonstrated with a simplified W-band receiver system. The possibility of a V-band system-on-substrate with on-board LO feed is also explored.
Download or read book Digitally Controlled Phased Array Transmitter Systems for Fusion Plasma Imaging Radar Reflectometric Diagnostics written by Meijiao Li and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Phased Antenna Array (PAA) technology with its compact structure, high gain, low side-lobes, and electronic beam steering and shaping capability is desirable for both military and civilian applications. Due to the dramatic growth of commercial demands and technology advances, PAA have begun to play an increased role and have achieved significant development in many new applications in civilian areas. In this dissertation, PAA technology has been developed for a specific application – Fusion Plasma Imaging Radar Reflectometric Diagnostics. Fusion energy with its self-sustainability and environmentally friendly nature stands out to be the clean and inexhaustible energy that humanity has dreamed about for a long time. Plasma Imaging Radar Reflectometric Diagnostics is a technology to remotely detect the plasma density fluctuations in fusion plasmas which helps scientists to better understand fusion and make the clean energy available sooner. In this dissertation, a Phased Array Transmitter System based on digitally controlled phase shifter technology, a wide band double-sided print bow-tie antenna, and a 16-element V-band array have been developed. Both the transmitter system and the V-band antenna array were designed, fabricated, and measured. Electromagnetics simulations were performed using both CST STUDIO SUITE® and HFSS. A low-cost, 28 GHz Phased Array Transmitter System with digitally controlled beam forming technology has been demonstrated. The 8-element PAA transmitter systems are fabricated on a low-cost PCB substrate to avoid the extra loss caused by connection of different circuit pieces and for easier integration and simpler circuit structure. By using wideband, double-side printed bow-tie antennas, and digitally controlled phase shifters together with frequency up-converter components, the systems can provide more than 40 degrees beam scanning ranges with high resolution of 1 degree, which satisfies the requirements for the microwave imaging reflectometer (MIR) system proposed for the NSTX-U fusion device at Princeton Plasma Physics Laboratory. The technology is scalable to larger arrays and higher frequencies and should have a broad range of applications.In the wide band V-band antenna design, a 46 GHz to 76 GHz double-sided printed bow-tie antenna with an elliptical lens was designed, implemented using low cost RO4003C substrate, and experimentally characterized. The antenna shows a gain of 16 dBi, and -15 dB side lobe ratio. In antenna array design, it is well known that a spacing of no more than a half wavelength between nearby antennas is desired to avoid grating lobe influence. As the dimensions of the designed antenna’s width are less than half of a wavelength (0.36 [lambda]), it is feasible to keep the space between each element in the array equal to half of a wavelength. Therefore, the designed antenna can also be used in antenna arrays or phased antenna array systems. To demonstrate the idea, a 16-element double-sided printed bow-tie array was designed, fabricated, and tested. The theoretical and measured far-field patterns agree well. With its compact structure, high gain, low side-lobes, and easy integration capability, it should be successfully applied to V-band (60 GHz) Phased Array Systems and will be specifically used for Plasma Imaging Radar Reflectometric Diagnostics applications.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science Abstracts written by and published by . This book was released on 1995 with total page 1360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Patent Abstracts Bibliography written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1987 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electronic Warfare and Radar Systems Engineering Handbook written by and published by . This book was released on 1997-04-01 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is designed to aid electronic warfare and radar systems engineers in making general estimations regarding capabilities of systems. It is not intended as a detailed designer's guide, due to space limitations. Portions of the handbook and future changes will be posted on an internet link.
Download or read book Waves and Instabilities in Plasmas written by F. Cap and published by Springer. This book was released on 2014-05-04 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the contents of a CISM Course on waves and instabilities in plasmas. For beginners and for advanced scientists a review is given on the state of knowledge in the field. Customers can obtain a broad survey.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bistatic SAR System and Signal Processing Technology written by Robert Wang and published by Springer. This book was released on 2017-12-26 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports the latest results in the study of Bistatic/Multistatic SAR system and signal processing techniques. Novel research ideas and experimental verification have been collected on all kinds of configurations of Bistatic/Multistatic SAR system, including the preliminary construction of system model, imaging algorithm design, mission design and the corresponding application representations etc. Handy well-prepared tables are provided for readers’ quick-reference, and the practical design of an interferometric SAR system is illustrated step by step. The book will be of interest to university researchers, R&D engineers and graduate students in Remote Sensing who wish to learn the core principles, methods, algorithms, and applications of Bistatic/Multistatic SAR system.
Download or read book NASA Patent Abstracts Bibliography A Continuing Bibliography Section 2 Indexes supplement 27 written by and published by . This book was released on 1985 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book European GNSS Galileo Open Service written by and published by Office for Official Publications of the European Communities. This book was released on 2010 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Patent Abstracts Bibliography written by United States. National Aeronautics and Space Administration Scientific and Technical Information Branch and published by . This book was released on 1987 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to IEEE Publications written by Institute of Electrical and Electronics Engineers and published by . This book was released on 1996 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues for 1973- cover the entire IEEE technical literature.
Download or read book IEE Proceedings written by Institution of Electrical Engineers and published by . This book was released on 1987 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indexes IEE proceedings parts A through J
Download or read book GNSS Remote Sensing written by Shuanggen Jin and published by Springer Science & Business Media. This book was released on 2013-10-01 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: The versatile and available GNSS signals can detect the Earth’s surface environments as a new, highly precise, continuous, all-weather and near-real-time remote sensing tool. This book presents the theory and methods of GNSS remote sensing as well as its applications in the atmosphere, oceans, land and hydrology. Ground-based atmospheric sensing, space-borne atmospheric sensing, reflectometry, ocean remote sensing, hydrology sensing as well as cryosphere sensing with the GNSS will be discussed per chapter in the book.
Download or read book Advisory Group for Aerospace Research and Development Index of Publications written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1987 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
