Download or read book Synthesis Imaging with ThEP Observing System for Radio Astronomy written by Aquib Moin and published by . This book was released on 2004 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Imaging in Radio Astronomy written by Richard A. Perley and published by . This book was released on 1989 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Imaging in Radio Astronomy written by Richard A. Perley and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Imaging in Radio Astronomy II written by Greg B. Taylor and published by . This book was released on 1999 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis imaging in radio astronomy II a collection of lectures from the Sixth NRAO NMIMT Synthesis Imaging Summer School held at Socorro New Mexico USA 17 23 June 1998 written by Greg B. Taylor and published by . This book was released on 1999 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multielement System Design in Astronomy and Radio Science written by L.E. Kopilovich and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The multielement systems have been widely used in many fields of astron omy and radio science in the last decades. This is caused by the increasing demands on the resolution and sensitivity of such systems over the wide range of the electromagnetic wavelengths, from gamma up to radio. The ground-based optical and radio interferometers, gamma-ray and X-ray or bital telescopes, antenna arrays of radio telescopes and also some other radio devices belong to scientific instruments using multielement systems. There fore, the current problems of the optimal construction of such systems, or precisely, those of searching for the best arrangement of the elements in them, were formulated. A rather large number of scientific papers, including those of the authors, is devoted to these problems, and we believe that the time has come to integrate the basic results of the papers into the mono graph. The offered book consists of three parts. The first part is concerned with the optimal synthesis of optical and radio interferometers of various types and purposes; the synthesis of non-equidistant antenna arrays is con sidered in the second part; and the methods for the construction of coded masks for X-ray and gamma-ray orbital telescopes are expounded in the third one. Since in the text combinatorial constructions which are little known to astronomers are used, the necessary information is given in the appendices. Various tables containing the parameters of the systems consid ered are also represented.
Download or read book Antem 2005 written by and published by . This book was released on 2005 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Mapping written by National Radio Astronomy Observatory (Estados Unidos) Workshop and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Instrumentation and Techniques for Radio Astronomy written by Paul F. Goldsmith and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 1988 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SparseRI a Compressed Sensing Framework for Aperture Synthesis Imaging in Radio Astronomy written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In radio interferometry, information about a small region of the sky is obtained in the form of samples in the Fourier transform domain of the desired image. Since this sampling is usually incomplete, the missing information has to be reconstructed using additional assumptions about the image. The emerging field of Compressed Sensing (CS) provides a promising new approach to this type of problem which is based on the supposed sparsity of natural images in some transform domain. We present a versatile CS-based image reconstruction framework called SparseRI, an interesting alternative to the clean algorithm, that permits a wide choice of different regularisers for interferometric image reconstruction. The performance of our method is evaluated on simulated data as well as on actual radio interferometry measurements from the VLA, showing that our algorithm is able to reproduce the main features of the test sources. The proposed method is a first step towards an alternative reconstruction approach that may be able to avoid typical artefacts like negative flux regions, work with large fields of view and non-coplanar baselines, avoid the gridding process, and reduce the amount of manual work that is required in order to obtain best-quality results.
Download or read book Tools of Radio Astronomy written by Thomas Wilson and published by Springer Science & Business Media. This book was released on 2008-12-19 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four signi?cant factors have led us to update this text. The ?rst is the breathtaking progress in technology, especially in receiver and digital techniques. The second is the advance of radio astronomy to shorter wavelengths, and the increased availab- ity of astronomical satellites. The third is a need to reorganize some of the chapters in order to separate the basic theory, that seldom changes, from practical aspects that change often. Finally, it is our desire to enhance the text by including problem sets for each chapter. In view of this ambitious plan, we have expanded the number of authors. In the reorganization of this edition, we have divided Chap. 4 of the 4th edition into two Chaps. 4 and 5. The ?rst remains Chap. 4, with a slightly different - tle, Signal Processing and Receivers: Theory. This was expanded to include digital processing and components including samplers and digitizers. In Chap. 5, Prac- cal Receiver Systems. we have relegated the presentations of maser and parametric ampli?er front ends, which are no longer commonly used as microwave receivers in radio astronomy, to a short section on “historical developments” and We have retained and improved the presentations of current state-of-the-art devices, cooled transistor and superconducting front ends. We have also included descriptions of local oscillators and phase lock loops. Chapters 5 and 6 in the 4th edition has now become Chap. 6, Fundamentals of Antenna Theory and Chap.
Download or read book A FPGA Based Spectral Line and Pulsar Observing System for Radio Astronomy written by Srikanth Bussa and published by . This book was released on 2011 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the design of a radio astronomy spectral line and pulsar observing system. This system will be part of the 20-m telescope at NRAO1 and will be used by the radio SkyNet project for radio astronomy outreach. Radio astronomical observations using this system are done in the X-Band (8-10 GHz). The system can be broadly divided into three units consisting of a super heterodyne receiver, a FPGA based digital spectrometer and a data acquisition unit. The super heterodyne receiver amplies, filters and down-converts the incoming radio sky frequency (RF) signal in the X-band to an intermediate frequency (IF) 500 MHz band signal, centered at 750 MHz. A tunable local oscillator selects the 500 MHz bandwidth in the band of sky frequencies. The IF signal is fed to the digital spectrometer. The high speed 8-bit analog to digital converter (ADC) in the spectrometer samples the IF signal at 1 Gs/s. The 8-bit ADC provides the high dynamic range required for the system. The digital outputs from the ADC are fed to the Xilinx Virtex V FPGA in ROACH2 board. A polyphase filter bank FFT spectrometer is implemented in the FPGA using CASPER3 technology. The spectra are accumulated for a specified integration time and dumped out into a host computer through a 10 Gigabit Ethernet (GbE) link. The characterization of the ADC and spectrometer are presented. The band pass stability of the spectrometer is measured to be 1000 s and hence any observations should measure a reference spectrum within this time. Since the front-end receiver was not available, the functionality of the spectrometer was tested using an L-Band (21cm) receiver system of the 43m radio telescope at NRAO. We have successfully detected HI emission from the Andromeda galaxy and signals from the Pulsar B0329+54.
Download or read book Synthesis Imaging in Optical Astronomy written by Richard Walter Wilson and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Single dish Radio Astronomy written by Snežana Stanimirović and published by . This book was released on 2002 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development of a Small Scale Radio Astronomy Image Synthesis Array for Research in Radio Frequency Interference Mitigation written by Jacob L. Campbell and published by . This book was released on 2005 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of the array is evaluated in this thesis. The culmination of this thesis is a radio image of the supernova remnant Cassiopeia A. This thesis concludes with simulations of an RFI mitigation experiment that can be performed with the new array (pending certain improvements to the array).
Download or read book Wide Field Aperture Synthesis Radio Astronomy written by Douglas Carl-Johan Bock and published by . This book was released on 1997 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Frequency Radio Synthesis Imaging of the Galactic Center Region written by Michael Evans Nord and published by . This book was released on 2005 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
