3-D Imaging of Vehicles using Wide Aperture Radar

Dungan, Kerry E.; Potter, Lee C.

doi:10.1109/taes.2011.5705669

Cited by 43 publications

(15 citation statements)

References 39 publications

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“…It has been shown that when the class of ASC models is used joint ly with frequency, polarization, and wide-angle apertures, the primitive class ambiguity is significantly reduced [7], [8], [15], [16]. Then, ASC primitives become highly desirable tar get features.…”

Section: Polarization Signal Featuresmentioning

confidence: 99%

Rethinking vehicle classification with wide-angle polarimetric SAR

Saville

Jackson

Fuller

2014

IEEE Aerosp. Electron. Syst. Mag.

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Section: Polarization Signal Featuresmentioning

confidence: 99%

Rethinking vehicle classification with wide-angle polarimetric SAR

Saville

Jackson

Fuller

2014

IEEE Aerosp. Electron. Syst. Mag.

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“…The inner bright ring of scattering represents a dihedral return from the base of the vehicle to the ground, while the lighter blue halo represents elevated features. [8] The antenna location is corrected using the procedure outlined in Sec. III for 14 QTs in the 5 km scene.…”

Section: Application To Vehicle Discriminationmentioning

confidence: 99%

Range focusing for large scene circular SAR

Dungan¹,

Nehrbass²

2012

2012 IEEE National Aerospace and Electronics Conference (NAECON)

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A recent circular synthetic aperture radar data collection contained various vehicles and calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scattering features show noticeable drift on the order of 2 m from orbit to orbit. The large scene contained 14 quad-trihedral (QT) calibration targets with radar cross sections that are similar to point targets in the elevation range of the scene. This paper presents an algorithm that uses the QTs to generate global range focusing parameters. Qualitative and quantitative results show the focusing provides a significant improvement to vehicle target discrimination.

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“…Additionally, CSAR systems have also three‐dimensional (3D) resolution capability meaning that the height information can be readily attained even from a single‐pass data . Due to these unique properties, CSAR has been widely used in various tasks, such as; geosynchronous CSAR imaging , high resolution mapping of urban areas , automatic target recognition (ATR) of vehicles and so forth.…”

Section: Introductionmentioning

confidence: 99%

“…Although CSAR offers important advantages over linear SAR, there are also serious challenges. In particular, the two‐dimensional (2D) CSAR images of wide‐field collections are generally exposed to image artifacts related to layover phenomenon . Wide‐field refers to CSAR geometries wherein the size of the scene is not much smaller than the scanning radius .…”

Section: Introductionmentioning

confidence: 99%

“…From the empirical view, the treatments of layover are mostly motivated by the availability of real data, as usually the X‐band GOTCHA data set is the case. In , the 3D reconstructions of vehicles from this data set were investigated by utilizing an inversion scheme for the lay‐over points. Besides, ground‐based CSAR set‐ups have also been implemented which utilize azimuthal (turntable) and linear elevation scans .…”

Section: Introductionmentioning

confidence: 99%

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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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3-D Imaging of Vehicles using Wide Aperture Radar

Cited by 43 publications

References 39 publications

Rethinking vehicle classification with wide-angle polarimetric SAR

Rethinking vehicle classification with wide-angle polarimetric SAR

Range focusing for large scene circular SAR

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

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