Tomographic processing of spotlight-mode synthetic aperture radar signals with compensation for wavefront curvature

Bauck, Jerald L.; Jenkins, W.K.

doi:10.1109/icassp.1988.196812

Cited by 15 publications

(18 citation statements)

References 3 publications

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“…This method is discussed in two papers by Jerald Bauck [30,31], which served as the preliminary work leading to his Ph.D. dissertation [32]. In discussing the wavefront curvaturecorrecting variation of CBP, Bauck states that with his method, "The task can be fairly easy, although requiring somewhat more computation that Fourier-based methods which use an FFT but do not correct for wavefront curvature.')…”

Section: Formationmentioning

confidence: 99%

Space-Variant Post-Filtering for Wavefront Curvature Correction in Polar-Formatted Spotlight-Mode SAR Imagery

Magotra¹,

Doren²

1999

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Section: Formationmentioning

confidence: 99%

Space-Variant Post-Filtering for Wavefront Curvature Correction in Polar-Formatted Spotlight-Mode SAR Imagery

Magotra¹,

Doren²

1999

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“…Among the SAR imaging methods that are applicable to circular aperture data and perhaps the most widely used method for this task is the back‐projection algorithm (BP) . Although the original formulation assumes planar wavefronts, the BP has been later extended to a more general formulation that tolerates the curvature of the electromagnetic waves . The more recent and detail formulations of this spherical BP method can be found in together with its imaging applications.…”

Section: Two‐dimensional Csar Imagingmentioning

confidence: 99%

Wide‐field circular SAR imaging: An empirical assessment of layover effects

Demirci

Yiğit

Özdemir

2014

Micro & Optical Tech Letters

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Radiation patterns in Figure 7(b) show that design B exhibits the low cross polarization level of 222 dB, conversely, design A and C has cross polarization level of 215 dB. In addition, ABSTRACT: In circular synthetic aperture radar (CSAR), targets are usually scanned over the complete azimuthal aperture of 360 . A major challenge inhibiting successful CSAR image production is encountered in two-dimensional imaging of relatively large scenes (i.e. wide-field scenarios). For such cases, the spatially variant radar signature gives rises to image degradations known as layover effects. In this paper, the imaging results for hypothetical and real complex targets using their CSAR data at C band are demonstrated to characterize these effects. In real experiments, a ground-based, outdoor CSAR system is exploited thanks to the circular balcony of a building that provides 270 view of targets. A spherical back-projection algorithm is used to focus near-field data and the reconstructed images are also cleaned out from clutter to more easily visualize the layover artifacts.ABSTRACT: In this article, a wideband monopole antenna with band notched reconfigurability is proposed. The antenna consists of a wideband monopole antenna, incorporated with reconfigurable electromagnetic bandgap (EBG) structures. Six EBG structures with different band notched frequency are used to achieve six band notched reconfigurations. The EBG structures are placed underneath the feed line of the antenna. A switch is placed at each EBG structure, and by controlling the state of the switch, the band notched operation of the EBG can be activated or deactivated. The proposed antenna is capable to provide useful features for the notched band UWB communication system. V C 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:497-501, 2015; View this article online at wileyonlinelibrary.com.

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“…(4) is known as the circular Radon transform of the target's reflectivity function which physically explains that the received signal for a spherical wavefront radiation is actually an average (integral) of the planar reflectivity function along the arc of a circle with a radius r. Thus, obtaining an image of the reflectivity can be thought as the process of inverting this circular averaging operation. One approach for this task is to use the back-projection algorithm that employs the projection-slice theorem for inversion [31,32]. Basically, the theorem for the 2D space states that 1D Fourier transform (FT) of the range profile at an angle θ represents the slice of the 2D FT of the target's reflectivity at the same angle [33].…”

Section: Back-projection Based Imagingmentioning

confidence: 99%

“…Various factors; including radar system parameters, reconstruction of the target's reflectivity function and variety of covering materials and their thickness are addressed to comprehend their effects on an effective detection. Two different imaging algorithms namely; the focusing operator based [30] and the back-projection [31,32] are employed to focus the wide-angle backscattering data. Issues regarding sampling requirements and resolution prediction for a full-aperture, i.e., 360 • collection geometry are also reviewed and presented to maintain the completeness.…”

Section: Introductionmentioning

confidence: 99%

A Study on Millimeter-Wave Imaging of Concealed Objects: Application Using Back-Projection Algorithm

Demirci¹,

Cetinkaya²,

Yiğit³

et al. 2012

PIER

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Abstract-Millimeter-wave (MMW) imaging is a powerful tool for the detection of objects concealed under clothing. Several factors including different kinds of objects, variety of covering materials and their thickness, accurate imaging of near-field scattered data affect the success of detection. To practice with such considerations, this paper presents the two-dimensional (2D) images of different targets hidden under various fabric sheets. The W-band inverse synthetic aperture radar (ISAR) data of various target-covering situations are acquired and imaged by applying both the focusing operator based inversion algorithm and the spherical back-projection algorithm. Results of these algorithms are demonstrated and compared to each other to assess the performance of the MMW imaging in detecting the concealed objects of both metallic and dielectric types.

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Tomographic processing of spotlight-mode synthetic aperture radar signals with compensation for wavefront curvature

Cited by 15 publications

References 3 publications

Space-Variant Post-Filtering for Wavefront Curvature Correction in Polar-Formatted Spotlight-Mode SAR Imagery

Space-Variant Post-Filtering for Wavefront Curvature Correction in Polar-Formatted Spotlight-Mode SAR Imagery

Wide‐field circular SAR imaging: An empirical assessment of layover effects

A Study on Millimeter-Wave Imaging of Concealed Objects: Application Using Back-Projection Algorithm

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