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 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 An IF Intermediate Frequency Clutter Signal Generator for the DREO EW Electronic Warfare Engagement Simulation Facility written by and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the implementation of an intermediate frequency (IF) radar clutter generator. The generator provides signals for the monopulse tracking radar which forms part of the Electronic Warfare Engagement Simulation Facility. Land clutter signals with log normal, Weibull and exponential spatial amplitude distributions are produced, as well as exponential sea clutter signals. Fluctuating clutter from wind blown scatters is modelled using narrowband amplitude modulation. Clutter induced angle tracking errors are also represented. The report describes the major clutter mechanisms relevant to noncoherent radars in low grazing angle scenarios. The hardware and equations used in modelling are described, and the report presents envelope detected waveforms plots and histograms. This work has applications in accurate modelling of radar performance in low altitude engagements. Keywords: Cross section; Exponential grazing angle; Intermediate frequency jamming; Land clutter; Missile seeker; Monopulse; Polarization; Sea clutter; Sea state; Tracking; Moving target indicators; Canada.
Download or read book High Level Adaptive Signal Processing Architecture with Applications to Radar Non Gaussian Clutter Volume 3 Spherically Invariant Random Processes for Radar Clutter Modeling Simulation and Distribution Identification written by and published by . This book was released on 1995 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation is motivated by the problem of detection of weak signals in a strong radar clutter background. The fundamental issues that need to be addressed in the weak signal detection problem are radar clutter modeling, simulation and distribution approximation. These issues are easily addressed when the clutter is a correlated Gaussian random process. However, these issues have not received much attention when the clutter is a correlated non-Gaussian random process. This thesis addresses the problem of modeling, simulation and distribution approximation of correlated non-Gaussian radar clutter. The theory of spherically invariant random processes is used for statistical characterization of non-Gaussian radar clutter. Several examples of multivariate probability density functions arising from spherically invariant random processes are presented. A new result which uniquely characterizes the multivariate probability density functions arising from spherically invariant random processes is obtained. Two new canonical computer simulation procedures are developed in order to simulate radar clutter that can be described by spherically invariant random processes. Finally, a new algorithm is used to address the problem of distribution identification of the clutter using relatively small sample sizes. This technique makes use of the result which uniquely characterizes the multivariate probability density functions arising from spherically invariant random processes and reduces the multivariate distribution approximation problem to an equivalent univariate distribution approximation problem resulting in a major simplification of processing.
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 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.
Download or read book A Clutter Model for Space Based Radar written by Carl J. Lauer and published by . This book was released on 1983 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A clutter model for a pulse doppler space based radar simulation is described. Ground clutter is represented as a random process with mean power, mean doppler, and doppler spread determined from experimental measurements and from physical and geometrical quantities pertinent to the radar location, look angle, beam pattern, etc. The above three quantities are used to define the clutter spectrum observed at a given radar range gate, and a statistical signal generation technique is employed to generate a realization or sample of the instantaneous clutter signal observed.
Download or read book High level Adaptive Signal Processing Architecture with Applications to Radar Non Gaussian Clutter written by Muralidhar Rangaswamy and published by . This book was released on 1995 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Radar Clutter Modeling written by W. Blau and published by . This book was released on 1968 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simulation method for the evaluation of radar performance in a clutter environment is explored. Three radar processors are tested on a common basis using measurement data in a theoretical model which displays both the spatial and frequency correlation properties of clutter. The effects of coherent, partially coherent, and specular scattering interacting with the radar processing are made evident. (Author).
Download or read book Further Evaluations of STAP Tests in Compound Gaussian Radar Clutter written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of a parametric space-time adaptive processing (STAP) method is presented here. Specifically, we consider signal detection in additive disturbance containing compound-Gaussian clutter plus additive Gaussian thermal white noise. Performance is compared to the normalized adaptive matched filter and the Kelly GLRT receiver using simulated and measured data. We focus on the issues of detection and false alarm probabilities, constant false alarm rate (CFAR), robustness with respect to clutter texture power variations, and reduced training data support.
Download or read book Adaptive Radar Detection in the Presence of Textured and Discrete Interference written by Jeong Hwan Bang and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Under a number of practical operating scenarios, traditional moving target indicator (MTI) systems inadequately suppress ground clutter in airborne radar systems. Due to the moving platform, the clutter gains a nonzero relative velocity and spreads the power across Doppler frequencies. This obfuscates slow-moving targets of interest near the "direct current" component of the spectrum. In response, space-time adaptive processing (STAP) techniques have been developed that simultaneously operate in the space and time dimensions for effective clutter cancellation. STAP algorithms commonly operate under the assumption of homogeneous clutter, where the returns are described by complex, white Gaussian distributions. Empirical evidence shows that this assumption is invalid for many radar systems of interest, including high-resolution radar and radars operating at low grazing angles. We are interested in these heterogeneous cases, i.e., cases when the Gaussian model no longer suffices. Hence, the development of reliable STAP algorithms for real systems depends on the accuracy of the heterogeneous clutter models. The clutter of interest in this work includes heterogeneous texture clutter and point clutter. We have developed a cell-based clutter model (CCM) that provides simple, yet faithful means to simulate clutter scenarios for algorithm testing. The scene generated by the CMM can be tuned with two parameters, essentially describing the spikiness of the clutter scene. In one extreme, the texture resembles point clutter, generating strong returns from localized range-azimuth bins. On the other hand, our model can also simulate a flat, homogeneous environment. We prove the importance of model-based STAP techniques, namely knowledge-aided parametric covariance estimation (KAPE), in filtering a gamut of heterogeneous texture scenes. We demonstrate that the efficacy of KAPE does not diminish in the presence of typical spiky clutter. Computational complexities and susceptibility to modeling errors prohibit the use of KAPE in real systems. The computational complexity is a major concern, as the standard KAPE algorithm requires the inversion of an MNxMN matrix for each range bin, where M and N are the number of array elements and the number of pulses of the radar system, respectively. We developed a Gram Schmidt (GS) KAPE method that circumvents the need of a direct inversion and reduces the number of required power estimates. Another unavoidable concern is the performance degradations arising from uncalibrated array errors. This problem is exacerbated in KAPE, as it is a model-based technique; mismatched element amplitudes and phase errors amount to a modeling mismatch. We have developed the power-ridge aligning (PRA) calibration technique, a novel iterative gradient descent algorithm that outperforms current methods. We demonstrate the vast improvements attained using a combination of GS KAPE and PRA over the standard KAPE algorithm under various clutter scenarios in the presence of array errors.
Download or read book Unifying Electrical Engineering and Electronics Engineering written by Song Xing and published by Springer Science & Business Media. This book was released on 2013-08-24 with total page 2154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unifying Electrical Engineering and Electronics Engineering is based on the Proceedings of the 2012 International Conference on Electrical and Electronics Engineering (ICEE 2012). This book collects the peer reviewed papers presented at the conference. The aim of the conference is to unify the two areas of Electrical and Electronics Engineering. The book examines trends and techniques in the field as well as theories and applications. The editors have chosen to include the following topics; biotechnology, power engineering, superconductivity circuits, antennas technology, system architectures and telecommunication.
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 VHDL Programming by Example written by Douglas L. Perry and published by McGraw Hill Professional. This book was released on 2002-06-02 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Teaches VHDL by example * Includes tools for simulation and synthesis * CD-ROM containing Code/Design examples and a working demo of ModelSIM
Download or read book Radar System Engineering written by Louis Nicot Ridenour and published by . This book was released on 2013-09 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contributing Authors Include E. M. Purcell, A. J. F. Siegert, M. H. Johnson And Others.
