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Author: Publisher: ISBN: Category : Languages : en Pages : 168
Book Description
This Final Technical Report presents the results of a feasibility investigation of a technique for calculating the far-field radar cross section of an object based upon measurements made in the near-field of the object. This technique is an extension of existing planar near-field antenna measurement technology, and is capable of measuring monostatic radar cross section and bistatic radar cross section at both narrow and wide angles. Included are the detailed formulation of the theory of near-field planar bistatic radar cross section measurement, and discussion of details of the mechanical scanner and software implementation. The comparison of measurement with predictions is presented; the agreement is excellent, and suggests that a larger-scale demonstration would be appropriate. Also included are concepts for reducing the amount of data required for reconstructing radar cross section, and a discussion of limitations of this method of radar cross-section measurement. Specific recommendations are presented for technology development areas that should be pursued to mature this measurement technique into a viable, operational technology. Among those areas are calibration, data handling, computational optimization, data analysis, operational considerations, and additional theoretical development.
Author: Publisher: ISBN: Category : Languages : en Pages : 168
Book Description
This Final Technical Report presents the results of a feasibility investigation of a technique for calculating the far-field radar cross section of an object based upon measurements made in the near-field of the object. This technique is an extension of existing planar near-field antenna measurement technology, and is capable of measuring monostatic radar cross section and bistatic radar cross section at both narrow and wide angles. Included are the detailed formulation of the theory of near-field planar bistatic radar cross section measurement, and discussion of details of the mechanical scanner and software implementation. The comparison of measurement with predictions is presented; the agreement is excellent, and suggests that a larger-scale demonstration would be appropriate. Also included are concepts for reducing the amount of data required for reconstructing radar cross section, and a discussion of limitations of this method of radar cross-section measurement. Specific recommendations are presented for technology development areas that should be pursued to mature this measurement technique into a viable, operational technology. Among those areas are calibration, data handling, computational optimization, data analysis, operational considerations, and additional theoretical development.
Author: Eugene F. Knott Publisher: Springer Science & Business Media ISBN: 1468499041 Category : Science Languages : en Pages : 557
Book Description
The original campus of the University of Michigan was nearly a perfect square about a half-mile along a side. A street-sized walk, appropriately called the Diag, runs diagonally across this square, connecting its southeast and northwest corners. In 1904 a new engineering building was either started or finished (I do not remember which) to house classrooms. When another engineering building was built on the expanded campus across the street from it many years later, the old building came to be known as West Engine, to distinguish it from the new East Engine. Old West Engine is (or maybe by now, was) a four-story, L-shaped structure that stood at the southeast corner of the original campus. It was built with an arch in it to straddle the Diag at the apex of the L. You walked over the Engineering Arch to get from one leg of the L to the other if you were inside the building, and you walked under it when you entered the campus from the southeast corner. Affixed to the masonry wall of the arch was a plaque I often noted in passing. It bore a quote attributed to Horace Greeley (1811-1872), who I did not know at the time was the founder, editor, and publisher of the New York Tribune. It said, simply, Young man, when theory and practice differ, use your horse sense. The suggestion seems worthy of an exclamation point instead of a period, but I do not remember if it had one.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722015046 Category : Languages : en Pages : 50
Book Description
A progress report on the development of a bistatic radar cross section (RCS) measurement range is presented. A technique using one parabolic reflector and a planar scanning probe antenna is analyzed. The field pattern in the test zone is computed using a spatial array of signal sources. It achieved an illumination pattern with 1 dB amplitude and 15 degree phase ripple over the target zone. The required scan plane size is found to be proportional to the size of the desired test target. Scan plane probe sample spacing can be increased beyond the Nyquist lambda/2 limit permitting constant probe sample spacing over a range of frequencies. Tuhela-Reuning, S. and Walton, E. K. Unspecified Center NAG3-1125...
Author: Publisher: ISBN: Category : Languages : en Pages : 164
Book Description
This research examined the applicability of the monostatic-bistatic equivalence theorem (MBET) and associated extensions in determining the extent to which correlation exists between monostatic and bistatic data for both the near and far-field. A secondary objective was to determine whether reliable bistatic near-field radar cross section (RCS) data could be collected on a range originally designed to take monostatic far-field measurements. Dr. David Falconer developed two extensions of the MBET in an effort to estimate the bistatic RCS pattern in both the near and far-field by measuring the monostatic RCS pattern at one-half the bistatic angle, at a reduced frequency, and, for the near-field case, at an adjusted target-to-receiver separation range. The pattern representation and accuracy of these two extensions were examined by measuring the RCS of an ogive, a circular flat plate, and two circular cylinders of different lengths. Theses.
Author: Eugene F. Knott Publisher: SciTech Publishing ISBN: 1891121251 Category : Technology & Engineering Languages : en Pages : 628
Book Description
The leading text and reference on radar cross section (RCS) theory and applications, this work presents a comparison of two radar signal strengths. One is the strength of the radar bean sweeping over a target, the other is the strength of the reflected echo senses by the receiver. This book shows how the RCS "gauge" can be predicted for theoretical objects.
Author: Robert Eigel Publisher: ISBN: 9781423544326 Category : Languages : en Pages : 209
Book Description
This research addresses some phenomenological aspects of bistatic scattering from a complex object with an emphasis on specular, shadowing, dihedral, and cavity effects. Five targets are investigated for their simplicity and ability to highlight certain scattering phenomena. Direct measurements of scattered electromagnetic energy and simulation data is gathered for a frequency bandwidth of 6-18 GHz. Both ray tracing and scattering center approaches are used to describe the bistatic mechanisms. An appraisal of the effectiveness and utility of the monostatic-to-bistatic equivalence theorems (Kell's and Crispin's) and several commercial scattering prediction codes is also accomplished. Simulation data is generated from two different electromagnetic scattering prediction codes, Xpatch and FISC. Xpatch is a physical optics (PO) based code while FISC is a more rigorous method of moments (MOM) based tool. This data is utilized to achieve three objectives: (1) study Kell's and Crispin's monostatic-to-bistatic equivalence theorems (MBET) for a complex object through theoretical derivations and comparison of measured and simulated data sets, (2) evaluate the performance of Xpatch and FISC through direct comparisons to measured data, and (3) gain insight into the bistatic scattering phenomenology while extracting appropriate rules-of-thumb for bistatic scattering predictions. These rules of thumb are proposed to help guide the reader in evaluating the bistatic RCS of complex shapes in general.
Author: Asoke K. Bhattacharyya Publisher: Artech House Radar Library (Ha ISBN: Category : Science Languages : en Pages : 322
Book Description
This reference describes techniques for controlling the RCS of targets, provides analytical methods for estimating RCS, develops models for the design of low RCS targets and antennas, and discusses several RCS enhancement techniques.
Author: W. Ross Stone Publisher: Institute of Electrical & Electronics Engineers(IEEE) ISBN: Category : Technology & Engineering Languages : en Pages : 554
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Author: 
Author: Eugene F. Knott
Author: National Aeronautics and Space Administration (NASA)
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Author: Eugene F. Knott
Author: J.W. Jr. Crispin
Author: Robert Eigel
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Author: Asoke K. Bhattacharyya
Author: W. Ross Stone