SAR Images of Rooms and Buildings Based on FDTD Computer Models

Dogaru, Traian; Le, Calvin

doi:10.1109/tgrs.2009.2013841

Cited by 80 publications

(52 citation statements)

References 24 publications

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“…In [10], [11], the authors project multipath echoes into several auxiliary delay-image planes, which is claimed to result in better estimates of scattering centers via direct path image reconstruction. Synthetic aperture radar images demonstrating multipath ghosts due to a human target in a rectangular room were shown, e.g., in [12] via finite difference time domain (FDTD) electromagnetic modeling. The presence of the LOS path was assumed and the application was through-the-wall sensing.…”

Section: A Literature On Multipath Exploitationmentioning

confidence: 99%

Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

Setlur

Negishi

Devroye

et al. 2014

IEEE J. Sel. Top. Signal Process.

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Abstract-Multipath is exploited to image targets that are hidden due to lack of line of sight (LOS) path in urban environments. Urban radar scenes include building walls, therefore creating reflections causing multipath returns. Conventional processing via synthetic aperture beamforming algorithms do not detect or localize the target at its true position. To remove these limitations, two multipath exploitation techniques to image a hidden target at its true location are presented under the assumptions that the locations of the reflecting walls are known and that the target multipath is resolvable and detectable. The first technique directly operates on the radar returns, whereas the second operates on the traditional beamformed image. Both these techniques mitigate the false alarms arising from the multipath while simultaneously permitting the shadowed target to be detected at its true location. While these techniques are general, they are examined for two important urban radar applications: detecting shadowed targets in an urban canyon, and detecting shadowed targets around corners.

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Section: A Literature On Multipath Exploitationmentioning

confidence: 99%

Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

Setlur

Negishi

Devroye

et al. 2014

IEEE J. Sel. Top. Signal Process.

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“…1 H is the relative permittivity of the environment at both two sides of the wall, 2 H is the relative permittivity of the wall, d is the thickness of the wall. We define the top surface of the wall as …”

Section: Theoretical Analysismentioning

confidence: 99%

“…of subsurface target by using inverse scattering imaging algorithms. TWR becomes a hot research area and a lot of achievements have obtained [2,3]. Time delay calculation is very important in time domain imaging.…”

Section: Introductionmentioning

confidence: 99%

A Fast Time-Delay Calculation Method in Through-Wall-Radar Detection Scenario

2016

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Abstract.In TWR (Through Wall Radar) signal processing procedure, time delay estimation is one of the key steps in target localization and high resolution imaging. In time domain imaging procedure such as back projection imaging algorithm, round trip propagation time delay at the path of "transmitter-target-receiver" needs to be calculated for each pixel in imaging region. In typical TWR scenario, transmitter and receiver are at one side and targets at the other side of a wall. Based on two-dimensional searching algorithm or solving two variables equation of four times, traditional time delay calculation algorithms are complex and time consuming, and cannot be used to real-time imaging procedure. In this paper, a new fast time-delay (FTD) algorithm is presented. Because of that incident angle at one side equals to refracting angle at the other side, an equation of lateral distance through the wall can be established. By solving this equation, the lateral distance can be obtained and total propagation time delay can be calculated subsequently. Through processing simulation data, the result shows that new algorithm can be applied effectively to real-time time-delay calculation in TWR signal processing.

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“…8 presents the simulated co-polarized and cross-polarized 3 rd Ludwig components at 1 GHz and 2 GHz in the elevation plane φ equal to 0° and azimuth plane θ equal to 90°. The possibility of exploiting cross-polarized components for wall mitigation and through-wall detection of human beings has been highlighted in [16]. However the analysis of issues such as antenna polarization purity and effective reception of weak cross-polarized components when developing an actual crosspolarized radar system is beyond the scope of this paper.…”

Section: B the Optimized Antenna Configuration -Simulation Fabricatmentioning

confidence: 99%

“…A material with the same electrical parameters of human skin is used to model uniformly the phantom, without the internal tissues and organs. This is possible because it has been observed that most of the electromagnetic energy at the frequency used for TTWI is reflected by the skin without penetration into the body [16,25]. This simplified human phantom allows saving memory and CPU time resources.…”

Section: B the Optimized Antenna Configuration -Simulation Fabricatmentioning

confidence: 99%

Optmized patch-like antennas for through the wall radar imaging and preliminary results with frequency modulated interrupted continuous wave

Fioranelli

Salous

Ndip

2012

2012 International Symposium on Signals, Systems, and Electronics (ISSSE)

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This paper presents optimized patch-like antennas for Through The Wall Imaging (TTWI) radar applications in the frequency range 0.5-2 GHz, and preliminary results using Frequency Modulated Interrupted Continuous Waveform (FMICW). Results of numerical simulations using basic models of the antenna are presented. The antenna optimization was aimed at making the radiation pattern more directional by focusing the energy in a single lobe to be directed towards the wall and the targets to be detected. The optimized antenna was manufactured and its measured parameters are compared with the simulated results which show good agreement. Some preliminary results from the FMICW radar system using this antenna are presented

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SAR Images of Rooms and Buildings Based on FDTD Computer Models

Cited by 80 publications

References 24 publications

Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

A Fast Time-Delay Calculation Method in Through-Wall-Radar Detection Scenario

Optmized patch-like antennas for through the wall radar imaging and preliminary results with frequency modulated interrupted continuous wave

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