Download or read book Modelling Airborne L band Radar Sea and Coastal Land Clutter written by Poh Lian Choong and published by . This book was released on 2000 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The limiting factor affecting the performance of most airborne radar systems in detecting targets on or near the wind-swept surface of the sea is return echoes from the sea surface known as sea clutter. This report address the clutter returns from a maritime environment for airborne L-band VV-polarised radar. Modelling of radar sea return is discussed with consideration to propagation under standard atmospheric conditions. A composite sea clutter model has been developed, which is based upon the concept of a two-scale sea surface model with directional sea spectrum and simple facet specular return at near-normal incidence. Several sea clutter models have been collated with data collected by the Naval Research Laboratory four-frequency radar system under varying sea conditions, and polarimetric synthetic aperture radar images of the North-West of Australia. The results of the comparison have shown that the composite sea clutter model better predicts the backscattering coefficient of sea surface returns for varying sea conditions, radar look directions, and grazing angles. In addition, a radar backscattering model for bare soil showed good agreement between modelling results and POLSAR data for returns from coastal saline flat surfaces surrounding the North-West coastal areas.
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 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 Integrating an Airborne L band Sea Clutter Model Into Research Laboratory Space Time Adaptive Processing RLSTAP written by Poh Lian Choong and published by . This book was released on 2001 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Model for Space Radar Clutter written by and published by . This book was released on 1979 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model for radar clutter as encountered from a space-based platform is developed. Included in the model are land, sea and airborne clutter with emphasis on land clutter. Parametric fits to existing reflectivity data are performed for seven generic terrain types: desert, forest, mountain, rural, urban, snow and ice and sea. The fits are parametric in frequency and grazing angle and, in the case of sea clutter, polarization. In addition to the mean values of clutter reflectivity, the variation about the mean is emphasized. The underlying causes of clutter variability nonhomogeneous terrain type, terrain undulation, etc., are discussed. Quantitative estimates of their effects are presented. A theory of probability density function of clutter based on the resolution cell size, correlation lengths, and underlying statistics of individual scatterers, is presented. Examples are worked out for five terrain types and a large resolution cell. The results are threshold settings required for given false alarm probabilities. Clutter spectra are discussed briefly. Finally, requirements and computer simulations are examined with particular attention to the advantages and disadvantages of three candidate measurement programs.
Download or read book Radar Reflectivity of Land and Sea written by Maurice W. Long and published by Artech House Publishers. This book was released on 1983 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This state-of-the-art edition of a radar classic brings you up-to-date on new developments in clutter measurement and modeling and features a wealth of new information not found in other currently available books. Authored by a recognized expert in the field, the book covers everything from basic concepts of radar reflectivity to space-time clutter amplitude and bistatic clutter.
Download or read book Air Defense Initiative ADI Clutter Model written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a republication of RADC-TR-90-170. This technical report documents a detailed radar clutter model utilized throughout the duration of the Air Defense Initiative (ADI) program conducted by the US Air Force from 1985 to 1995. One objective of this effort was to identify possible sources of false alarms in an airborne early warning (AEW) radar environment, and quantify the number of sources as a function of radar frequency, location, season, and time of day. Analysis is presented for radars designed to operate at UHF, L-Band, and S-Band. The environments modeled included tropospheric clutter (precipitation, lightning, and turbulent layer), sea clutter (open sea and land-sea interface), distributed terrain clutter, discrete manmade clutter (buildings, vehicles, and vessels), angels (birds and insects), and aurora. ADI was initially created to provide for a defense against low radar cross section threats. The most significant problem facing ADI is achieving a high probability of detection against modern targets while maintaining very low false alarm rates due to clutter returns. Given the power and size constraints of an AEW radar, most of the burden for achieving this performance is placed on waveform design and signal processing which, in turn, is strongly influenced by how the interference from the clutter environment is defined.
Download or read book Sea Clutter written by Keith D. Ward and published by IET. This book was released on 2006-06-21 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sea Clutter: Scattering, the K Distribution and Radar Performance examines the statistics of radar scattering from the sea surface in terms of their relevance to radar operating in a maritime environment; including remote sensing, surveillance and targeting applications. A lot of the work in the book is based on the compound Kdistribution model for the amplitude statistics of sea clutter. In addition, the book addresses the specification of performance required by customers and the measurement of performance of systems supplied to customers.
Download or read book Models of Land Clutter Vs Grazing Angle Spatial Distribution and Temporal Distribution written by Yunhan Dong and published by . This book was released on 2004 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 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 Calibrated L Band Terrain Measurements and Analysis Program Results written by R. W. Larson and published by . This book was released on 1988 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses the final year's activities of a program to generate and analyze L-band clutter data. The L-band radar data used throughout this study were derived from airborne synthetic aperture radar imagery. Radar cross section measurements from a variety of distributed targets are presented, including sea surface, sea ice, agricultural fields and forests. Both HH and VV polarized data are presented. Models are presented which describe the intensity distribution of SAR data as well as describe L-band scattering from rough surfaces. The density distribution models describe the observed SAR intensity distributions quite well, whereas the radar scattering models in some cases overpredict the SAR-observed values. Keywords: Radar; L-Band; Backscatter cross sections; Terrain; and Measurement.
Download or read book A State Model for Airborne Radar Ground Clutter written by Donald Carol Watson and published by . This book was released on 1970 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book L band VV Clutter Analysis for Natural Land in Northern Territory Areas written by Yunhan Dong and published by . This book was released on 2003 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Land clutter is statistical by nature and its values vary in many different dimensions. This report analyses land clutter characteristics using Air SAR data for airborne L band VV polarised radars. In particluar, the report concentrates on the distribution of clutter values with respect to grazing angles for various vegetation communities typically seen in the Northern Territory region in Australia. Future reports will address wider aspects, including sparial distributions and Doppler spectrums of clutter sufficient to enable the generation of radar clutter models.
Download or read book A Model of Coherent Radar Land Backscatter written by G. C. Sarno and published by . This book was released on 1991 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The detection of targets in a land clutter background is a problem for most ground-based and airborne pulse-Doppler radars. Understanding how land clutter behaves can lead to modified clutter suppression techniques for improving radar target detection performance. This paper presents a model of land clutter which has been validated against a number of different land types observed at different frequencies. The characteristics of the clutter which limit target detection are discussed.
Download or read book Earth Resources written by and published by . This book was released on 1983 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time domain Modelling of Ocean Clutter for Ground Wave Radar written by and published by . This book was released on 1989 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The detection performance of high frequency ground wave (HFGW) radar systems, for over-the-horizon detection of surface targets, is limited by the back scattering returns from the ocean surface. An improved modelling of the ocean clutter is the key to enhanced target detection with HFGW radar; this would enable clutter suppression techniques to be refined and a higher signal-to-noise ratio to be achieved. This paper proposes a wave packet model for the dominant components of the ocean back scattering signal and suggests a technique to exploit this non-stationary characteristic of the ocean clutter to improve target detection performance. The technique is based on the Wigner-Ville distribution, which is an emerging tool for non-stationary spectral analysis. Results are presented to demonstrate the enhanced detection performance of the proposed technique.
