Download or read book An OTH Radar Clutter Simulation written by and published by . This book was released on 1991 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer simulation is described which was developed with the objective of arriving at an understanding of OTH radar clutter originating in the equatorial ionosphere. This source of clutter is of particular interest in OTH radar, since all radar propagation paths must pass through the equatorial region, even if the desired targets are far removed from it. A central feature of the simulation is an ionospheric propagation model developed to synthesize OTH radar clutter by making use of state-of-the art models for global ionospheric structure, including small-scale irregularities, and combining these with efficient ray tracing procedures and a multiple phase-screen approach to computing the diffraction of radar energy by the irregular ionosphere. Simulated clutter data is compared to actual measurements using several radars, with generally satisfactory results.
Download or read book Radar Sea Clutter written by Luke Rosenberg and published by IET. This book was released on 2021-12-17 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents comprehensive coverage of new research into sea clutter characterisation and modelling, radar performance prediction and maritime target detection. The book also includes a summary of sea-clutter scattering characteristics and datasets provided that can be used for modelling.
Download or read book Self Cohering an OTH Radar on Clutter Returns written by Hesham Attia and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation develops over-the-horizon (OTH) signal processing techniques that adaptively mitigate adverse time-varying ionospheric propagation effects. Propagation of HF radar returns through the ionosphere often results in a random spread of energy in time and space. Adaptive signal processing techniques use the statistical properties of radar clutter to measure and correct receive phase errors in an OTH radar without the need for a remote beacon. These approaches make use of complex spatial correlations between neighboring elements, or subarrays, in a phased array receive antenna to estimate and correct the differential phase errors, thereby restoring the correlation distance across the receive array to undo propagation-induced directivity and gain degradations. By compensating for time-varying spatial phase errors, this technique also reduces spread-Doppler clutter. Similarly, making use of complex temporal correlations between successive received range sweeps corrects for pulse-to-pulse errors. The algorithms are applied to 0Th backscatter data collected by Rome Laboratory's VALAR facility. Results show wide variation between data sets, and as a function of range within a data set, with significant improvement in cases of severe propagation anomalies. In one instance, a combination of algorithms reduces the spread-Doppler clutter below the noise and provides 10 dB processing gain. These results imply improved subclutter visibility (SCV) in OTH radar and new methods to combat fading in long-range HF communications.
Download or read book Sea Clutter written by Keith Ward and published by IET. This book was released on 2013-04-22 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Sea Clutter: Scattering, the K Distribution and Radar Performance gives an authoritative account of our current understanding of radar sea clutter. Topics covered include the characteristics of radar sea clutter, modelling radar scattering by the ocean surface, statistical models of sea clutter, the simulation of clutter and other random processes, detection of small targets in sea clutter, imaging ocean surface features, radar detection performance calculations, CFAR detection, and the specification and measurement of radar performance. The calculation of the performance of practical radar systems is presented in sufficient detail for the reader to be able to tackle related problems with confidence. For this fully revised and updated second edition new material has been added on the Doppler characteristics of sea clutter and associated detection processing methods, bistatic sea clutter measurements; electromagnetic scattering theory of littoral sea clutter and bistatic sea clutter; the use of models for predicting radar performance, including discussion of Lognormal and Weibull models; further results and extended discussion on the modelling of the K distribution shape parameter for different conditions; the simulation of Doppler spectra of sea clutter; high grazing angle scattering; and the use of the K distribution in other fields. The material has been reorganized into four parts: Sea Clutter Properties, Mathematics of the K distribution, Radar Detection and Physical Modelling. This reorganization allows readers to access specific areas quickly, without the need for an extensive knowledge of the other parts.
Download or read book High Frequency Over the Horizon Radar written by Giuseppe Aureliano Fabrizio and published by McGraw Hill Professional. This book was released on 2013-07-09 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: THE MOST COMPLETE GUIDE TO HIGH FREQUENCY OVER-THE-HORIZON RADAR Written by a leading global expert on the topic, High Frequency Over-the-Horizon Radar provides in-depth coverage of the signal processing models and techniques that have significantly advanced OTH radar technology. This pioneering work describes the fundamental principles of OTH radar design and operation, and then delves into the mathematical modeling of HF signals received by actual OTH radar systems based on experimental data analysis. Numerous examples illustrate the practical application of modern adaptive signal processing techniques to real and simulated OTH radar data. This authoritative text covers skywave and surface-wave systems and is an invaluable resource for researchers, engineers, and practitioners working with OTH radar systems and technologies.
Download or read book RADAR CLUTTER RESEARCH written by Stephen N. Andre and published by . This book was released on 1968 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this program was to prepare a clutter research plan for Army air defense weapons that encompasses the anticipated methods of employment of these weapons, as well as the problems associated with the introduction of new radar technology in these systems. Specifically, the investigations included studies of the physics of electromagnetic scattering from rough surfaces, a definition of clutter problems as related to innovations in radar technology such as electronic beam steering, signal processing and design, computer technology, study of clutter models and simulation techniques, and a study of clutter effects in a radar defense complex. Probability density functions, correlation functions and doppler spectra of clutter signals are derived for the configuration in which only a few major scatterers are present. Results are presented for both coherent and noncoherent detection. Methods of simulating clutter, using both analog and digital approaches, are described. Emphasis is placed on advanced forms of simulators such as would be required for evaluation of future multi-dimensional radar systems rather than on additive filtered noise for the simulation of clutter. The simulation techniques are based on two suggested generic forms of clutter models, called open-loop and closed loop. Because of the greater flexibility of closed-loop simulation, this is presented in greater detail. Techniques for performing radar clutter measurements are described and some of the significant problems, related primarily to terrain and cultural observables, are discussed. Clutter problems as related to radar systems and innovations in radar technology, such as electronically steered phased arrays, are also described. (Author).
Download or read book Applications of Space Time Adaptive Processing written by Richard Klemm and published by IET. This book was released on 2004-08-13 with total page 971 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text discusses various applications of space-time adaptive processing, including applications in OTH-radar, ground target tracking, STAP in real world clutter environments, jammer cancellation, superresolution, active sonar, seismics and communications. It is divided into two parts: the first dealing with the classical adaptive suppression of airborne and spacebased radar clutter, and the second comprising of miscellaneous applications in other fields such as communications, underwater sound and seismics.
Download or read book Digital Simulation of Radar Clutter written by Wallace E. Wood and published by . This book was released on 1974 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weibull Radar Clutter written by Matsuo Sekine and published by IET. This book was released on 1990 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The material presented in this book is intended to provide the reader with a pratical treatment of Weibull distribution as applied to radar systems. This book is primarily written for radar engineeres. Topics include: general derivation of Weibull distribution, measurements of Weibull-distributed clutter, comparison of Weibulkl distribution with various distributions including Rayleigh, gamma, log-nornal and k- distributions to name just a few.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1973 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improvement of Real Time F0F2 Prediction for OTH Radars written by B. S. Dandekar and published by . This book was released on 1995 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radar Return from Targets Hidden by Ground Clutter written by Werner W. Gerbes and published by . This book was released on 1967 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical solution to the problem of radar return from objects hidden by ground clutter is formulated in this report. The solution is based on a model in which metal targets are simulated by the substitution of metal for the ground. A comparison of the returned signal from the simulated target with the returned signal from the earth is obtained, and calculated values are graphically presented for various values of dielectric constants, conductivities, and depth of clutter. (Author).
Download or read book Radar Signal Simulation in Clutter Limited Environments written by Greenlay, Terrence O and published by Hamilton, Ont. : Communications Research Laboratory, Faculty of Engineering, McMaster University. This book was released on 1978 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Digital Simulation Study of an Airborne Radar Ground Clutter Model written by Marvin Jack Moss and published by . This book was released on 1966 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Generation and Simulation of Clutter for RADAR Testing Using FPGA written by Pardhu Thottempudi and published by LAP Lambert Academic Publishing. This book was released on 2015-06-30 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detection of weak target echo in the presence of strong clutter is the main objective of any RADAR. To evaluate the performance of RADAR it is required to generate the clutter of various types including land and sea. This clutter is of non Gaussian distribution such as lognormal, Weibull and k-type. In this book it is proposed to develop a clutter generation algorithm of given distribution type. This process consists of random number generator with Gaussian distribution converting into a non Gaussian using ZMNL (Zero Memory Nonlinearity Transformation) technique. It also includes amplitude shaping and addition other interference signals.
Download or read book High Resolution Radar Clutter Analysis and Modeling for Advanced Target Detection Strategies written by and published by . This book was released on 2007 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report results from a contract tasking University of Pisa as follows: The research is divided in two phases. In the first phase, we consider modeling and estimating the characteristic parameters of high resolution non-Gaussian sea clutter. We will investigate specifically nonstationarity and possible non-Gaussianity of the clutter on long period of time, by applying nonhomogeneity tests and spectral analysis to highlight the temporal changes of the clutter process. The analyses of high resolution clutter will be performed by processing complex clutter data collected in November 1993 and in winter 1998 with the high resolution IPIX radar, provided by McMaster University, at a range resolution of 60 m, 30 m, 15 m, 9 m, and 3 m, in like- (HH-VV) and crosspolarizations (HV-VH) An accurate characterization of the high resolution radar clutter allows a more adequate design of the radar detector of targets. This detector needs to be adaptive to the data and should have the ability to comply with the non-homogeneous nature of the clutter interference. This aspect of the problem will be discussed in the second phase of this study. A detailed analysis of the impact of the nonstationarity of the clutter will be performed first analytically (where possible) and by means of simulations; then we will use the real recorded data to feed adaptive detectors, designed for stationary Gaussian and non-Gaussian clutter, and we will compare theoretical and simulated performance with real data performance.
