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Spectral Characteristics Of Low Angle Radar Ground Clutter
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Book Synopsis Spectral Characteristics of Low-angle Radar Ground Clutter by :
Download or read book Spectral Characteristics of Low-angle Radar Ground Clutter written by and published by . This book was released on 1989 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of ground-based radars is affected by the spectral characteristics of ground clutter. Most signal processing algorithms designed to enhance detection performance are Doppler-frequency-sensitive, such as the moving target indicator filter, Doppler processor and coherent clutter map. This report gives the results of a comprehensive spectral analysis of low-angle ground clutter, using the MIT Lincoln Laboratory Phase I data and the DREO S-band clutter data. The report presents the spectral analysis of ground clutter for different bands of radar frequency; describes the data used in the spectral analysis, including both the conventional Fourier analysis and a super-resolution spectral analysis technique; gives a brief background on the maximum entropy spectral estimate; and describes the particular procedure designed to bring out the spectral characteristics of ground clutter from short time series.
Book Synopsis Radar Ground Clutter Measurement and Models. Part 2. Spectral Characteristics and Temporal Statistics by : Hing C. Chan
Download or read book Radar Ground Clutter Measurement and Models. Part 2. Spectral Characteristics and Temporal Statistics written by Hing C. Chan and published by . This book was released on 1991 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of ground-based surveillance radars is affected by the spectral characteristics and the temporal statistics of ground clutter. Traditionally, ground clutter problems are treated by employing filtering techniques such as delay-line cancellers. These techniques result in a degraded detection performance of low-velocity targets. With the worsening congestion in air traffic, there is an increased demand for improved performance of low-velocity target detection. To improve the detection performance of ground-based surveillance radars for low-velocity targets, signal processing algorithms which exploit ground-clutter characteristics must be developed. This requires a thorough understanding of ground-clutter behaviour. In this paper, we report the results of the spectral and statistical analyses of low-angle ground clutter, using data of the MIT Lincoln Laboratory Phase I program and S-band coherent ground-clutter data collected by the Radar Division of the Defence research Establishment Ottawa. The results of the spectral analysis show that ground clutter, as observed by a coherent radar with a stationary antenna, comprises three components: (a) a coherent component, (b) a slow-diffuse component and (c) a fast-diffuse component. These components can be described by relatively simple models. The model parameters are functions of radar frequency, waveform resolution, land cover and wind speed.
Book Synopsis Low-Angle Radar Land Clutter by : J. Barrie Billingsley
Download or read book Low-Angle Radar Land Clutter written by J. Barrie Billingsley and published by William Andrew. This book was released on 2002-04-01 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt: A necessary reference for all radar engineers or analysts including many levels of managers, advisors and decision makers in the U.S. and worldwide radar industry. Directly useful in both military (DOD) and civilian (FAA) applications. The result of 20 years of research at MIT Lincoln Lab, this book is of the most significant tehcnological consequence for the industry. It actually solves the problem of low angle radar land clutter by showing the reader how to design and predict the performance of radars that operate in situations where land clutter prevalent. Radar land clutter constitutes the unwanted radar echoes returned from the earth's surface that compete against and interfere with the desired echoes returned by targets such as aircraft and other moving and stationary targets. The ability to accurately predict the effects of land clutter in surface radar has been an unsolved problem for many years. This book is comprehensive in addressing the topic, containing many interrelated results, each important in its own right. It unifies and integrates all the results so as to create a comprehensive, innovative, and unequaled work. The results of this book directly enable the reader to predict land clutter effects in surface radar. Modern military aircraft deliberately fly low to hide their presence from radars that are also dealing with land clutter. Depending on the terrain, the performance of the radar varies greatly from very good to very poor. This book helps radar engineers provide accurate assessments of ground clutter, thus bringing their ability to detect and operate against low flying aircraft to a much higher and much more consistent level.
Book Synopsis Low-angle Radar Land Clutter by : J. Barrie Billingsley
Download or read book Low-angle Radar Land Clutter written by J. Barrie Billingsley and published by IET. This book was released on 2002 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this unique book, Billingsley solves the problem of radar land clutter by showing the reader how to design and predict the performance of radars that operate in situations where echoes from the earth's surface interfere with radar target echoes.
Author : Publisher :Elsevier ISBN 13 :0080950604 Total Pages :722 pages Book Rating :4.0/5 (89 download)
Download or read book written by and published by Elsevier. This book was released on with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectral Characteristics of Radar Target Returns in Clutter by : Herman V. Cottony
Download or read book Spectral Characteristics of Radar Target Returns in Clutter written by Herman V. Cottony and published by . This book was released on 1970 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of further investigation into the possibility of resolving radar targets in clutter, using spectral approach, are described. Characteristics of back-scatter returns by ground-clutter scatterers consisting of seven non-resonant scatterers are examined in the frequency domain. It is seen that, when the scatterers are of equal magnitude and are equally spaced in range, the returns, in the frequency domain, are characterized by lobes of relatively high amplitude separated by gaps in frequency spectrum where the amplitude is relatively low. A mathematical analogy to the radiation pattern of an array antenna is pointed out. Three quasi-random ground-clutter models were designed, using tables of random digits. The returns from these models, measured in the frequency domain, were recorded and compared with the computed results. Taking into account the differences between the assumed conditions and the conditions found at the range, the agreement is found satisfactory. Three cases of backscatter radar models consisting of one or two non-resonant target scatterers in quasi-random clutter models were investigated. As a result, it appears that the search for hidden target scatter may be simplified if a searching pulse, with time delay varying linearly with time, is injected into the system. (Author).
Book Synopsis Low-angle X-band Radar Ground Clutter Spatial Amplitude Statistics by : J. Barrie Billingsley
Download or read book Low-angle X-band Radar Ground Clutter Spatial Amplitude Statistics written by J. Barrie Billingsley and published by . This book was released on 2002 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1990 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Temporal Statistics of Low-Angle Ground Clutter by : H. C. Chan
Download or read book Temporal Statistics of Low-Angle Ground Clutter written by H. C. Chan and published by . This book was released on 1989 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed knowledge of the temporal statistics of ground clutter is essential to determine the detection threshold settings so as to maximize the probability of target detection while maintaining an acceptable probability of false alarm. The performance of existing false alarm control schemes is often limited due to a lack of detailed knowledge of the ground clutter temporal statistics. In this study we analyze experimental data to characterize the temporal statistics of low-angle ground clutter in terms of the clutter's linear amplitude distribution. Effects of radar frequency, polarization, waveform resolution, land covers and wind speed on the statistics are examined. Results show that the Ricean distribution and its limiting case, the Rayleigh distribution, are appropriate models for ground clutter in steady-state wind conditions. This implies that the diffuse clutter components, which give rise to the random properties of ground clutter may be modeled as a complex Gaussian process. We found, however, that at any given time there is a fraction of the resolution cells with clutter data having nonstationary temporal statistics not well modelled by the Ricean or Rayleigh distribution. The frequency of occurrence of nonstationary clutter statistics depends on radar frequency, land cover and wind speed. Forested land cover represents the worst case scenario. Application of the results of this study to determine optimal detection threshold settings is discussed. Radar clutter; Phased array radar; S band; Canada. (edc).
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analyses of Millimeter Wave Radar Low-Angle Ground-Clutter Measurements for European-Like and Desert Environments by : Ronald Wellman
Download or read book Analyses of Millimeter Wave Radar Low-Angle Ground-Clutter Measurements for European-Like and Desert Environments written by Ronald Wellman and published by . This book was released on 1996-07-01 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes millimeter wave ground based radar cross section measurements taken to support the SWOE JT&E program over two years. RCS measurements were made on selected ground clutter patches for one month and over another 43-day period at Camp Grayling, MI; and for 47 days at Yuma Proving Ground, AZ. Instruments collected data on meteorological conditions, solar flux, and soil moisture content. A wide range of atmospheric conditions was observed in Grayling over the measurement periods. The conditions in Yuma over the measurement period were relatively stable. In this report, we describe the variations in the ground based measured RCS of different clutter types over time and space for environmental conditions encountered during the three field tests. We have developed and will present an empirical model to describe these variations for the Yuma and Grayling II environments.
Book Synopsis Noise and Clutter Rejection in Radars and Imaging Sensors by : T. Suzuki
Download or read book Noise and Clutter Rejection in Radars and Imaging Sensors written by T. Suzuki and published by North Holland. This book was released on 1990 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 138 papers contained in this volume present the newest and most sophisticated techniques, which have been developed in different but related fields of research from radar to medical and industrial imaging. Enormously extended areas of research are covered, they are however, related to each other from the view point of noise and clutter rejection. The interdisciplinary nature of the proceedings will make them of considerable interest to a broad readership. A selection of contents: Polarimetric SAR: Principles and Applications (F.T. Ulaby). Flow field characterization by NMR (O. Nalcioglu). Weibull clutter and its suppression (M. Sekine). Sessions: A. Noise and Clutter Properties. I. Application of the K-distribution to Radar Clutter (K.D. Ward). Sea CAS: Sea clutter acquisition system (J. Dunn-Rogers). Space and frequency correlation of multipath fading due to sea surface scattering and its reduction by diversity technique for low G/T mobile satellite communications (M. Yasunaga et al.). II. A study of land clutter spectrum (N. Li). Polarimetric measurement of the propagation characteristics of forest clutter (M.W. Whitt et al.). Remote Sensing. I.
Book Synopsis A Study of Ground Clutter Suppression at the CHILL Doppler Weather Radar by : James Tom Peltier
Download or read book A Study of Ground Clutter Suppression at the CHILL Doppler Weather Radar written by James Tom Peltier and published by . This book was released on 1989 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimal Spectrum Filtering for the Radar Detection of Targets in Clutter by : John K. Schindler
Download or read book Optimal Spectrum Filtering for the Radar Detection of Targets in Clutter written by John K. Schindler and published by . This book was released on 1969 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel radar technique is proposed for detecting the presence of a target having a priori known frequency-dependent scattering properties. The target coexists with a large collection of clutter elements having random scattering properties and ranges. Assuming a wideband random signal excitation, the power spectrum of the scattered field consists of the target return having an a priori known frequency behavior embedded in a clutter return having a random frequency dependence. On an ensemble average basis, the clutter appears as additive noise from which the existence of a prescribed target return must be extracted.
Book Synopsis Principles of Radar and Sonar Signal Processing by : François Le Chevalier
Download or read book Principles of Radar and Sonar Signal Processing written by François Le Chevalier and published by Artech House. This book was released on 2002 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles of Radar and Sonar Signal Processing offers you a thorough presentation of the latest technologies in conventional and adaptive signal processing theory, and covers techniques for detailed analysis of physical signatures of targets and clutter. You learn how target signature analysis provides you with a better understanding of the various techniques used in anechoic chambers and modern radar systems. Examples of signatures give you a greater insight into classification problems. A discussion on low frequency systems, wideband radars, and STAP provides you with a better awareness of physical limits and future developments.
Book Synopsis Principles of Integrated Maritime Surveillance Systems by : A. Nejat Ince
Download or read book Principles of Integrated Maritime Surveillance Systems written by A. Nejat Ince and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information is always required by organizations of coastal states about the movements, identities and intentions of vessels sailing in the waters of interest to them, which may be coastal waters, straits, inland waterways, rivers, lakes or open seas. This interest may stem from defense requirements or from needs for the protection of off-shore resources, enhanced search and rescue services, deterrence of smuggling, drug trafficking and other illegal activities and/or for providing vessel traffic services for safe and efficient navigation and protection of the environment. To meet these needs it is necessary to have a well designed maritime surveillance and control system capable of tracking ships and providing other types of information required by a variety of user groups ranging from port authorities, shipping companies, marine exchanges to governments and the military. Principles of Integrated Maritime Surveillance Systems will be of vital interest to anyone responsible for the design, implementation or provision of a well designed maritime surveillance and control system capable of tracking ships and providing navigational and other types of information required for safe navigation and efficient commercial operation. Principles of Integrated Maritime Surveillance Systems is therefore essential to a variety of user groups ranging from port authorities to shipping companies and marine exchanges as well as civil governments and the military.
