Analysis Of Space Based Radar Clutter Spectra Over Different Types Of Terrain And Their Effects On Detection Performance
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Analysis Of Space Based Radar Clutter Spectra Over Different Types Of Terrain And Their Effects On Detection Performance
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Author : D. Faubert
language : en
Publisher:
Release Date : 1986
Analysis Of Space Based Radar Clutter Spectra Over Different Types Of Terrain And Their Effects On Detection Performance written by D. Faubert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
A computer model was used to make a detailed analysis of the clutter spectra received by real aperture Space-Based Radars orbiting over different types of terrain. The influence of terrain on L-band SBR detection performance has also been studied. It was found that the clutter spectra tend to become narrower as the grazing ange of the antenna increases but that they broaden as the antenna points progressively more away from the direction of motion of the satellite. The interference caused by the clutter background is progressively higher for ice covered ground but smaller for a snow-covered terrain and the smallest for an ocean background. The minimum detectable velocities of the SBR were found to vary by a factor of up to three according to the terrain type. (Canada).
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Technical Reports Awareness Circular Trac
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Author :
language : en
Publisher:
Release Date : 1987-05
Technical Reports Awareness Circular Trac written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987-05 with Science categories.
Radar Ground Clutter Measurement And Models Part 2 Spectral Characteristics And Temporal Statistics
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Author : Hing C. Chan
language : en
Publisher:
Release Date : 1991
Radar Ground Clutter Measurement And Models Part 2 Spectral Characteristics And Temporal Statistics written by Hing C. Chan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
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.
Technical Information Indexes
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Author :
language : en
Publisher:
Release Date : 1975
Technical Information Indexes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Aeronautics, Military categories.
A Model For Space Radar Clutter
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Author :
language : en
Publisher:
Release Date : 1979
A Model For Space Radar Clutter written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
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.
Government Reports Annual Index
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Author :
language : en
Publisher:
Release Date : 1987
Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Government reports announcements & index categories.
Autonomous Mobile Robots
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Author : Frank L. Lewis
language : en
Publisher: CRC Press
Release Date : 2018-10-03
Autonomous Mobile Robots written by Frank L. Lewis and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-03 with Technology & Engineering categories.
It has long been the goal of engineers to develop tools that enhance our ability to do work, increase our quality of life, or perform tasks that are either beyond our ability, too hazardous, or too tedious to be left to human efforts. Autonomous mobile robots are the culmination of decades of research and development, and their potential is seemingly unlimited. Roadmap to the Future Serving as the first comprehensive reference on this interdisciplinary technology, Autonomous Mobile Robots: Sensing, Control, Decision Making, and Applications authoritatively addresses the theoretical, technical, and practical aspects of the field. The book examines in detail the key components that form an autonomous mobile robot, from sensors and sensor fusion to modeling and control, map building and path planning, and decision making and autonomy, and to the final integration of these components for diversified applications. Trusted Guidance A duo of accomplished experts leads a team of renowned international researchers and professionals who provide detailed technical reviews and the latest solutions to a variety of important problems. They share hard-won insight into the practical implementation and integration issues involved in developing autonomous and open robotic systems, along with in-depth examples, current and future applications, and extensive illustrations. For anyone involved in researching, designing, or deploying autonomous robotic systems, Autonomous Mobile Robots is the perfect resource.
Government Reports Annual Index Corporate Author
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Author :
language : en
Publisher:
Release Date : 1987
Government Reports Annual Index Corporate Author written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Government reports announcements & index categories.
Spectral Characteristics Of Low Angle Radar Ground Clutter
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Author :
language : en
Publisher:
Release Date : 1989
Spectral Characteristics Of Low Angle Radar Ground Clutter written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
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.