Multipath synthetic aperture radar imaging

DeLaurentis, John M.

doi:10.1049/iet-rsn.2010.0225

Cited by 13 publications

(10 citation statements)

References 5 publications

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“…Without factoring in these effects, imaging of entities within the measurement domain will be severely impacted. In addition, uncompensated refraction or diffraction through interfaces between transmission mediums can lead to localization or focusing errors, leading to image offsets and blurring [24].…”

Section: Research Motivationmentioning

confidence: 99%

Extraction of weak target features from radar tomographic imagery

Almutiry

Wicks

Nassib

et al. 2015

2015 National Aerospace and Electronics Conference (NAECON)

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Radio Frequency (RF) Tomography is a mathematical process of 3D image reconstruction from a measurement using a multistatic distribution of transmitters and receivers. The geometric diversity of these elements increases the information in the measurements. The process of determining the permittivity and conductivity profile in the measurement domain, and, therefore, the shape of the target, from the scattered field measurements, is an inverse problem. To solve this problem, under conventional methods such as the Born approximation, we use the principles of linear scattering to determine a linear relationship between measured returns and target shape. The Born approximation is valid if the scatterer is small and does not interact strongly with other objects. However, strong scatterers within the domain may generate sidelobes masking weaker returns. This masking, in conjunction with multipath effects, may result in loss of features and subsequent failure to identify a target. In this research, a novel method is proposed to increase overall image quality and extend the capabilities of RF tomography by modeling the strong scatterers in the measurement domain as dipoles that behave as secondary sources (transmitters). Unlike conventional methods, the dipole model reduces the effects of the sidelobes from the strong scatterers ix

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Section: Research Motivationmentioning

confidence: 99%

Extraction of weak target features from radar tomographic imagery

Almutiry

Wicks

Nassib

et al. 2015

2015 National Aerospace and Electronics Conference (NAECON)

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“…Also, the energy of the multipath reflection may appear at locations where no target exists, resulting in unwanted objects, a.k.a. "ghosts" on the image [15].…”

Section: Introductionmentioning

confidence: 99%

Extraction of Weak Scatterer Features Based on Multipath Exploitation in Radar Imagery

Almutiry

Monte

Wicks

2017

International Journal of Antennas and Propagation

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We proposed an improved solution to two problems. The first problem is caused by the sidelobe of the dominant scatterer masking a weak scatterer. The proposed solution is to suppress the dominant scatterer by modeling its electromagnetic effects as a secondary source or “extra dependent transmitter” in the measurement domain. The suppression of the domain scatterer reveals the presence of the weak scatterer based on exploitation of multipath effects. The second problem is linearizing the mathematical forward model in the measurement domain. Improving the quantity of the prediction, including multipath scattering effects (neglected under the Born approximation), allows us to solve the inverse problem. The multiple bounce (multipath) scattering effect is the interaction of more than one target in the scene. Modeling reflections from one target towards another as a transmitting dipole will add the multiple scattering effects to the scattering field and permit us to solve a linear inverse problem without sophisticated solutions of a nonlinear matrix in the forward model. Simulation results are presented to validate the concept.

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“…In this context, recent research efforts have been devoted from one side to mitigate multipath effects [8]- [11] and from the other side to exploit the additional information provided by multipath to improve the system performance [12]- [18]. Most of this literature on multipath exploitation lies in the frame of through-wall imaging and urban sensing, and a valuable overview of the current state-of-the-art is given in [19].…”

Section: Introductionmentioning

confidence: 99%

“…The approaches present in the literature exploit the aspect-dependent character of multipath ghosts by subaperture imaging strategies [8]- [10] or the nonlinearity of the phase delays of ghosts in the data [11]. These methods have been developed under far-field conditions and mainly apply to SAR imaging from airborne platforms.…”

Section: Introductionmentioning

confidence: 99%

Multipath Ghosts in Radar Imaging: Physical Insight and Mitigation Strategies

Gennarelli

Soldovieri

2015

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Most algorithms commonly exploited for radar imaging are based on linear models that describe only direct scattering events from the targets in the investigated scene. This assumption is rarely verified in practical scenarios where the objects to be imaged interact with each other and with surrounding environment producing undesired multipath signals. These signals manifest in radar images as "ghosts" that usually impair the reliable identification of the targets. The recent literature in the field is attempting to provide suitable techniques for multipath suppression from one side and from the other side is focusing on the exploitation of the additional information conveyed by multipath to improve target detection and localization. This work addresses the first problem with a specific focus on multipath ghosts caused by target-to-target interactions. In particular, the study is performed with regard to metallic scatterers by means of the linearized inverse scattering approach based on the physical optics (PO) approximation. A simple model is proposed in the case of point-like targets to gain insight into the ghosts problem so as to devise possible measurement and processing strategies for their mitigation. Finally, the effectiveness of these methods is assessed by reconstruction results obtained from full-wave synthetic data.

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Multipath synthetic aperture radar imaging

Cited by 13 publications

References 5 publications

Extraction of weak target features from radar tomographic imagery

Extraction of weak target features from radar tomographic imagery

Extraction of Weak Scatterer Features Based on Multipath Exploitation in Radar Imagery

Multipath Ghosts in Radar Imaging: Physical Insight and Mitigation Strategies

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