Download or read book Small aperture Radio Direction finding written by Herndon H. Jenkins and published by Artech House Radar Library (Ha. This book was released on 1991 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Operating principles - Performance difinition - Direction-finding error sources - System level descriptions - Representative operational small-aperture - Passive geolocation - Subsystem considerations - Calibration and test of direction-finding systems.
Download or read book Radio Direction Finding and Superresolution written by P. J. D. Gething and published by IET. This book was released on 1991 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enlarged and revised second edition. Modern direction finders, capable of measuring elevation angles as well as azimuth angles on the components of multi-ray wavefields, have become powerful tools for research in ionospheric physics and HF radio propagation. The complexity of the problem of resolving closely-spaced rays requires the combined use of wide aperture antenna arrays, multichannel receiving systems and sophisticated digital processing techniques.
Download or read book An Investigation of a Digital Bearing Computer for a Small Aperture Radio Direction Finding System written by Hubert Lee Grush and published by . This book was released on 1965 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Passive Synthetic Aperture for Radio Direction Finding written by Mano Dorsey Judd and published by . This book was released on 1995 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Illinois Technograph written by and published by . This book was released on 1959 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern HF Signal Detection and Direction Finding written by Jay R. Sklar and published by MIT Press. This book was released on 2018-09-25 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed descriptions of detection, direction-finding, and signal-estimation methods, using consistent formalisms and notation, emphasizing HF antenna array sensing applications. Adaptive antenna array technology encompasses many powerful interference suppression approaches that exploit spatial differences among signals reaching a radio receiver system. Today, worldwide propagation phenomenology occurring in the High Frequency (HF) radio regime has made such interference common. In this book, Jay Sklar, a longtime researcher at MIT Lincoln Laboratory, presents detailed descriptions of detection, direction-finding, and signal-estimation methods applicable at HF, using consistent formalisms and notation. Modern electronic system technology has made many of these techniques affordable and practical; the goal of the book is to offer practicing engineers a comprehensive and self-contained reference that will encourage more widespread application of these approaches. The book is based on the author's thirty years of managing MIT Lincoln Laboratory work on the application of adaptive antenna array technologies to the sensing of HF communication signals. After an overview of HF propagation phenomenology, communication signal formats, and HF receiver architectural approaches, Sklar describes the HF propagation environment in more detail; introduces important modulation approaches and signaling protocols used at HF; discusses HF receiver system architectural features; and addresses signal processor architecture and its implementation. He then presents the technical foundation for the book: the vector model for a signal received at an adaptive array antenna. He follows this with discussions of actual signal processing techniques for detection and direction finding, including specific direction-finding algorithms; geolocation techniques; and signal estimation.
Download or read book An Investigation of Space Diversity Radio Direction Finding written by Richard Lee Sydnor and published by . This book was released on 1962 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The object of this investigation is to determine how far apart radio direction finders should be placed in order to obtain statistically independent samples, and to establish the number of radio direction finders to be included in the ensemble average. The conclusions are based upon high frequency radio direction finder bearing data observations obtained from two small aperture radio finders separated by a variable distance. Crossed-Adcock type direction finders were used and the separation distance was varied from 1/32 to 1/4 mi. The data were obtained over a period of approximately one yr during the time when conditions in the ionosphere were normal. (Author).
Download or read book Radio Direction Finding written by David William Watson and published by . This book was released on 1971 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radio Direction Finding written by United States. Department of the Army and published by . This book was released on 1977 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods for Direction Finding of Direct Sequence Spread Spectrum Signals written by Magnus Finne and published by DIANE Publishing. This book was released on 1996 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of spread-spectrum signals has increased dramatically in military radio communications. This report locates methods for direction-finding direct-sequence spread-spectrum (DS/SS) signals; digital methods are of special interest. A literature survey was conducted to see if there are any known methods. Investigated if a DS/SS detection method using a square-law detector can be extended to direction-finding. By use of computer simulations, show the performance of the methods found. Benefits and problems are also discussed.
Download or read book Radio Direction Finding on High Frequency Short Duration Signals written by Dennis Dean Sheppard and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of accomplishing high frequency direction finding against short duration (100-1000 ms) HF skywave signals using narrow aperture antennas is investigated. Two statistical procedures for estimating the signal bearing are proposed and compared. These procedures employ time averaging to reduce the large instantaneous bearing error caused by the phase and amplitude distortion of the wavefront due to scattering and multipath interference. Results are presented using data collected with the Southwest Research Institute Coaxial Spaced Loop HFDF system. It is shown that for a limited sample of data from this system the standard deviation of the bearing estimate for a 200 ms signal varied from 15 to 59 degrees. (Author).
Download or read book An Investigation of a Digital Bearing Computer for a Small Aperature Radio Direction Finding System written by Hubert L. Grush and published by . This book was released on 1965 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: A small aperture radio direction finding system such as a Watson-Watt system is subject to large bearing errors because of the wave interference effect of two waves. By contrast, a large aperture system such as a Wullenweber system exhibits smaller errors under corresponding conditions. This work attempts to develop a practicable means of obtaining accurate bearing information using a small aperture system in the presence of strong wave interference. The technique used is the time averaging of instantaneous bearings. Thus, bearing information may be obtained with a small aperture system by using information available over an extended period of time. The computation of the bearing may be carried out on-line by a small general purpose digital computer. One of the unique features of the digital bearing computer developed here is its capability to adapt to changing input signal conditions. The adaptive capability makes it possible to optimize the averaging process. The process allows estimates of the indicated bearings of both the primary and the interfering waves and their relative strengths to be made. A mathematical model for the relative phase between the two waves is evolved which is not unlike that of the real phase function. The model yields a regular progression of phase plus a random perturbing component. The only restriction placed upon the phase function is that its probability density function be essentially uniform. (Author).
Download or read book Electronic Warfare Receivers and Receiving Systems written by Richard A. Poisel and published by Artech House. This book was released on 2015-06-01 with total page 833 pages. Available in PDF, EPUB and Kindle. Book excerpt: Receivers systems are considered the core of electronic warfare (EW) intercept systems. Without them, the fundamental purpose of such systems is null and void. This book considers the major elements that make up receiver systems and the receivers that go in them. This resource provides system design engineers with techniques for design and development of EW receivers for modern modulations (spread spectrum) in addition to receivers for older, common modulation formats. Each major module in these receivers is considered in detail. Design information is included as well as performance tradeoffs of various components. Major factors that influence the functioning of the modules are identified and discussed. Key performance parameters are identified as well, and approaches to achieving design goals are considered.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electronic Observers for Radio Direction Finding written by Robert S. SMITH and published by . This book was released on 1965 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automated bearing readout methods are investigated for the Wullenweber wide-aperture radio direction finder, with particular attention to the effects of amplitude modulation on bearing readout. An examination of a generalized RDF system is given to show the potential effects of the various components on bearing readout accuracy, and the state of the art in RDF systems and readout methods is reviewed. T The system to be used for this study, the Wullenweber wide aperture set, is described in detail, noting the pertinent characteristics for this study. Some statistical characteristics involved in readout problems are discussed and the three basic requirements for the application of Wiener's work in time series are noted, along with the nature of the output ensemble from the DF receiver. Tchebysheff's inequality is applied to the prediction of sample size requirements, and some sampling rate considerations are noted in the light of the predicted sample sizes.
Download or read book The Principles and Practice of Radio Direction Finding written by Charles H. Cotter and published by . This book was released on 1961 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antenna Systems and Electronic Warfare Applications written by Richard Poisel and published by Artech House. This book was released on 2012 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antennas systems play a critical role in modern electronic warfare communications and radar. Today's EW engineers need to have a solid understanding of the design principles of this technology and how antenna systems are used in the field. This comprehensive book serves as a one-stop resource for practical EW antenna system know-how. Supported with over 700 illustrations and nearly 1,700 equations, this authoritative reference offers professionals detailed explanations of all the important foundations and aspects of this technology. Moreover, engineers get an in-depth treatment of a wide range of antenna system applications. The book presents the key characteristics of each type of antenna, including dipoles, monopoles, loops, arrays, horns, and patches. Practitioners also find valuable discussions on the limitations of antennas system performance in EW applications.
