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Modeling target variability using the SBR technique [radar applications]
2005 IEEE Antennas and Propagation Society International Symposium
Year: 2005 | Conference Paper |
In this paper, we presented an approach to predict the statistical moments of radar cross section due to dimensional variability when using the SBR (shooting and bouncing ray tracing) technique. The various sources of dimension variability include manufacturing tolerances and CAD modeling errors due to limited knowledge of the target. Though we derived the first two moments, higher order moments c...Show More
Angular tracking of 3D scattering center using an optical flow algorithm
2005 IEEE Antennas and Propagation Society International Symposium
Year: 2005 | Conference Paper |
Cited by: Papers (4)
In radar cross section studies it is well known that the EM scattered field from an electrically large target can often be well modeled as if it is emanating from a discrete set of points on the target called scattering centers. In this paper, we presented an algorithm to perform angular tracking of 3D scattering centers extracted using the SBR (shooting and bouncing ray) technique. The angular tr...Show More
CrossFlux: a method for hybridizing Xpatch and other codes
2005 IEEE Antennas and Propagation Society International Symposium
Year: 2005 | Conference Paper |
Cited by: Papers (1)
In electromagnetics, there is a class of problems that have two distinct parts. An example is computing scattering from a car next to a tower. The tower part is suitable for a high-frequency solver such as Xpatch. The car, with its small features and material, is best handled by a full-wave solver. The question is how to hybridize two isolated solutions with interactions. In this paper, we demonst...Show More
Shadow boundary and truncated wedge ILDCs in Xpatch [radar applications]
2005 IEEE Antennas and Propagation Society International Symposium
Year: 2005 | Conference Paper |
Cited by: Papers (5)
Recent electromagnetic formulation efforts related to the shooting and bouncing ray tracing code suite Xpatch have concentrated upon higher order diffractive phenomena such as creeping waves and the truncation effects due to diffraction from finite sized wedge faces. These classes of diffraction are essential components of the radar returns at large bistatic angles from complex, low observable tar...Show More
Xpatch 4: the next generation in high frequency electromagnetic modeling and simulation software
D. Andersh;J. Moore;S. Kosanovich;D. Kapp;R. Bhalla;R. Kipp;T. Courtney;A. Nolan;F. German;J. Cook;J. Hughes
Record of the IEEE 2000 International Radar Conference [Cat. No. 00CH37037]
Year: 2000 | Conference Paper |
Xpatch, developed at SAIC-DEMACO under the leadership of the Air Force Research Laboratory (AFRL), has become the premier high frequency simulation code suite for radar signature predictions. Xpatch applies the shooting and bouncing ray (SBR) method to realistic 3D targets in order to generate 0D through 3D radar signatures. The Xpatch prediction codes and analysis tools for measured and predicted...Show More
3D scattering center representation of complex targets using the shooting and bouncing ray technique: a review
We present an automated technique to extract the three-dimensional scattering-center model of a target from its geometrical CAD model. The technique is based on the shooting and bouncing ray (SBR) method. In this article, we first review the basic concepts behind the three-dimensional scattering-center-extraction algorithm. Next, we present application examples of signature-data compression and ra...Show More
A global scattering center representation of complex targets using the shooting and bouncing ray technique
We present a methodology to extract a global scattering center model a complex target. Using the shooting and bouncing ray technique, we first extract the three-dimensional (3-D) scattering center representations of the target at various aspect angles. Next the correspondence between scattering centers across angles are established by utilizing 3-D location information. The data are grouped based ...Show More
Super-resolved time-frequency analysis of wideband backscattered data
A time-frequency super-resolution procedure is presented for processing wideband backscattered data containing both scattering center and natural resonance information. In this procedure, Prony's method is first applied in the frequency domain to locate scattering centers. The data is processed one slice at a time through the use of a sliding window function. Parameterized models for the scatterin...Show More
Super-resolved time-frequency processing of wideband backscattered data
Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting
Year: 1994 | Conference Paper |
The time-frequency processing of wideband backscattered data from complex targets has recently been shown to be a powerful tool in analyzing and interpreting the scattering physics of targets. The basic concept behind the time-frequency processing is to process the data one small chunk at a time through the use of a sliding window function. In the two-dimensional time-frequency plane, scattering c...Show More
Time-frequency analysis of backscattered data from a coated strip with a gap
The short-time Fourier transform is applied to analyze the backscattered signal from a coated strip with a gap in the coating. The resulting time-frequency display shows good localization of the different scattering mechanisms. In particular, the time-frequency representation is well suited for identifying the dispersive surface wave contributions. The different scattering mechanisms are further e...Show More
The scattering and absorption characteristics of material-coated periodic gratings under oblique incidence
A boundary integral formulation is presented for calculating the scattering from material-coated periodic gratings under oblique incidence. Periodic boundary conditions and expansion of the fields in terms of Floquet harmonics allow the boundary integral formulation to treat just a single period of the infinite grating. Numerical results for an etched conducting grating designed for use at infrare...Show More
Scattering by lossy material coated periodic gratings under oblique incidence
Proceedings of IEEE Antennas and Propagation Society International Symposium
Year: 1993 | Conference Paper |
A numerical approach to the study of material coated two-dimensional periodic gratings under oblique incidence is presented. The boundary integral method is used to characterize the complex contour of a single groove (or period) of the grating. The underlying periodicity of the infinite structure is then accounted for by applying periodic boundary conditions and expanding the fields in terms of Fl...Show More
Numerical diffraction coefficients for the conductor-backed dielectric half-plane
IEEE Antennas and Propagation Society International Symposium 1992 Digest
Year: 1992 | Conference Paper |
A method is presented for extracting the numerical diffraction coefficients for coated edges and material joints. Without resorting to an IBC approximation, an exact boundary integral formulation of the coated edge is used as the basis of numerical coefficient extraction. The semi-infinite problem is solved by taking into account the nondecaying physical optics and surface wave fields such that th...Show More
Scattering by conductor-backed dielectric gaps
Antennas and Propagation Society Symposium 1991 Digest
Year: 1991 | Conference Paper |
The electromagnetic scattering from two-dimensional conductor-backed dielectric gaps was studied previously, but the isolated contributions from the gap and surface wave phenomena were not extracted. In the present work, two different approaches are implemented to attack the dielectric gap problem and extract the diffracted field and surface wave contributions of the gap. The first approach uses a...Show More
Characterization of a 90 degrees microstrip bend with arbitrary miter via the time-domain finite difference method
A 90 degrees microstrip bend with an arbitrary miter is characterized using the finite difference time-domain (FDTD) method. In this method, to simplify computations, the microstrip structure is enclosed by four electric walls; thus radiation effects are neglected. Time histories generated by FDTD techniques are Fourier-transformed to yield broadband scattering parameters of the microstrip bend. A...Show More
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