Foliage transmission measurements using a ground-based ultrawide band (300-1300 MHz) SAR system

Sheen, D.R.; Malinas, N.P.; Kletzli, D. W.; Lewis, Terry B.; Román, Juan Félix

doi:10.1109/36.285195

Cited by 30 publications

(7 citation statements)

References 7 publications

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“…Foliage attenuation exhibits a slight dependence on attenuation. In particular, attenuation tends to be slightly larger for VV polarization than for HH polarization [13] [36]. This is especially noticeable at lower frequencies [13], at which attenuation is primarily driven not by leaves and branches, but instead by tree trunks, most of which are vertically oriented.…”

Section: Polarizationmentioning

confidence: 93%

“…This demonstrates the primary motivation for the use of lower-frequency transmissions in FOPEN imaging: as frequency increases, target return signals diminish until they are overwhelmed by foliage clutter, and target detection becomes impossible. An additional motivation for lower-frequency operation is the impact of phase variation, which is more marked at higher frequencies [36] [42].…”

Section: Frequencymentioning

confidence: 99%

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The Use of Multiple-Polarization Data in Foliage Penetrating (FOPEN) Synthetic Aperture Radar (SAR) Applications

Richards¹

2002

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Foliage penetrating (FOPEN) synthetic aperture radar (SAR) systems are capable of producing images of targets concealed under a foliage canopy. The quality and interpretability of these images, however, is generally limited by dense foliage clutter and by fundamental foliage-induced image degradation. Use of a polarimetric SAR to provide multiple polarization channels can mitigate these effects by offering target and scene information beyond that provided by a single-polarization SAR. This paper presents the results of a literature survey to investigate the use of multiple-polarization data in conjunction with FOPEN SAR applications. The effects of foliage propagation on SAR image quality are briefly summarized. Various approaches to multiple-polarizationbased FOPEN target detection are described. Although literature concerning FOPEN target recognition is scarce, the use of multiple-polarization data for in-the-clear target recognition is described. The applicability of various target detection and recognition applications for use with concealed target SAR (CTSAR) imagery is considered.

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Section: Polarizationmentioning

confidence: 93%

Section: Frequencymentioning

confidence: 99%

The Use of Multiple-Polarization Data in Foliage Penetrating (FOPEN) Synthetic Aperture Radar (SAR) Applications

Richards¹

2002

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“…The far-zone time-domain backscattered results are normalized as follows. The frequency-domain, far-zone polarimetric scattering matrix can be expressed as (1) where is the wavenumber of the top region (usually air), and is the nominal far-zone distance from the target to the observer. The normalized time-domain results are defined as (2) where and represent the frequency dependence of the (vertical) and (horizontal) polarized incident-field components.…”

Section: Data Formatmentioning

confidence: 99%

“…S CATTERING from tree trunks plays an important role in many remote sensing applications. For example, in foliage-penetrating (FOPEN) radar, scattering from tree trunks constitutes the principal source of clutter [1]. FOPEN radar systems typically operate at VHF and low-UHF frequencies, for which foliage penetration is reasonably effective.…”

Section: Introductionmentioning

confidence: 99%

Rigorous modeling of ultrawideband VHF scattering from tree trunks over flat and. sloped terrain

Geng

Nguyen

et al. 2001

IEEE Trans. Geosci. Remote Sensing

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Three electromagnetic models are employed for the investigation of ultrawideband VHF scattering from tree trunks situated over flat and sloped terrain. Two of the models are numerical, each employing a frequency-domain integral-equation formulation solved via the method of moments (MoM). A body-of-revolution (BoR) MoM formulation is applied for a tree trunk on a flat terrain, implying that the BoR axis is perpendicular to the layers of an arbitrary layered-earth model. For the case of sloped terrain, the BoR model is inapplicable, and therefore the MoM solution is performed via general triangular-patch basis functions. Both MoM models are very accurate but are computationally expensive. Consequently, we also consider a third model, employing approximations based on the closed-form solution for scattering from an infinite dielectric cylinder in free space. The third model is highly efficient computationally and, despite the significant approximations, often yields accurate results relative to data computed via the reference MoM solutions. Data from the three models are considered, and several examples of application to remote sensing are addressed.

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“…Like the GPR, sense-through-foliage radar takes advantage of UWB's very fine resolution (time gating) and low frequency of operation. Sheen, et al [19] have measured ultrawideband (UWB) backscatter from foliage, as has a team of researchers from MIT [6] and from the U.S. Army Research Laboratory (ARL) [15], for different polarizations and frequency ranges. In [12], Kapoor et al studied the detection of targets obscured by a forest canopy using a UWB radar.…”

Section: Introductionmentioning

confidence: 99%

Sense-through-wall human detection based on UWB radar sensors

Liang¹

2016

Signal Processing

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Foliage transmission measurements using a ground-based ultrawide band (300-1300 MHz) SAR system

Cited by 30 publications

References 7 publications

The Use of Multiple-Polarization Data in Foliage Penetrating (FOPEN) Synthetic Aperture Radar (SAR) Applications

The Use of Multiple-Polarization Data in Foliage Penetrating (FOPEN) Synthetic Aperture Radar (SAR) Applications

Rigorous modeling of ultrawideband VHF scattering from tree trunks over flat and. sloped terrain

Sense-through-wall human detection based on UWB radar sensors

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