Characterization of Perfectly Conducting Targets in Resonance Domain With Their Quality of Resonance

Chauveau, Janic; Beaucoudrey, N. de; Saillard, J.

doi:10.2528/pier07041602

Cited by 9 publications

(7 citation statements)

References 22 publications

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“…In [9], we stated that the transfer function of a resonator ' ', with a natural angular frequency of resonance and a quality factor , given by (3) can be expressed, in the complex plane, as…”

Section: Extraction Of Resonance Parameters From the Transfer Funmentioning

confidence: 99%

“…In general, the selected poles are those which are close to the vertical axis. In [9], we propose to represent a natural pole not only in Cartesian coordinates, , but also in the form , where the natural angular frequency of resonance,…”

Section: Extraction Of Resonance Parameters From the Transfer Funmentioning

confidence: 99%

“…For canonical (sphere, cylinder, dipole etc.) as well as complex shape targets, poles are distributed over branches joining the fundamental pole (dominant pole: ) and the harmonic poles [9], [14]. The main advantage of using such natural poles for discrimination of targets is that only three parameters are required to define each resonance mode.…”

Section: Extraction Of Resonance Parameters From the Transfer Funmentioning

confidence: 99%

See 2 more Smart Citations

Resonance Behavior of Radar Targets With Aperture: Example of an Open Rectangular Cavity

Chauveau

Beaucoudrey

Saillard

2010

IEEE Trans. Antennas Propagat.

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In the resonance region, the radar scattering response of any object can be modelled by natural poles with the formalism of the singularity expansion method. These natural poles are resonance parameters which provide useful information for the discrimination of radar targets as their general shape, characteristic dimensions and constitution. In the case of an open radar target, high-Q internal resonances and low-Q external resonances occur respectively inside the target and on its surface. Because internal resonances have a higher Q, they may have a higher total energy and can thus be used for target identification. In this paper, we choose to study the resonance behavior of a perfectly conducting rectangular cavity with a rectangular aperture. With this simple example, we intend to show how to distinguish between the two origins of these resonances: external resonances corresponding to traveling waves on the surface of the target and internal resonances corresponding to cavity waves. Indeed, this can be applied to characterize aircrafts, whose apertures (such as inlets, open ducts, airintakes, cavities etc.) contribute significantly to the overall radar cross section.

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Section: Extraction Of Resonance Parameters From the Transfer Funmentioning

confidence: 99%

Section: Extraction Of Resonance Parameters From the Transfer Funmentioning

confidence: 99%

Section: Extraction Of Resonance Parameters From the Transfer Funmentioning

confidence: 99%

See 1 more Smart Citation

Resonance Behavior of Radar Targets With Aperture: Example of an Open Rectangular Cavity

Chauveau

Beaucoudrey

Saillard

2010

IEEE Trans. Antennas Propagat.

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“…If the representation (1) is compared to the transfer function of a damped harmonic oscillator, such as an RLC resonant circuit, it is seen after some analysis that the variables σ m and ω m can also be expressed in terms of an Eigenfrequency ω 0,m and a quality factor Q m . The corresponding relations are given by (Chauveau et al, 2007) …”

Section: Immunity Tests In Frequency Domain and The Quality Factor Ofmentioning

confidence: 99%

Frequency versus time domain immunity testing of Smart Grid components

Gronwald

2014

Adv. Radio Sci.

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Abstract. Smart Grid components often are subject to considerable conducted current disturbances in the frequency range 2-150 kHz and, as a consequence, it is necessary to provide reliable immunity test methods. The relevant basic standard IEC 61000-4-19 that is currently under discussion focusses on frequency domain test methods. It is remarked in this contribution that in the context of frequency domain testing the chosen frequency spacing is related to the resonance response of the system under test which, in turn, is characterized in terms of resonance frequencies and quality factors. These notions apply well to physical system but it is pointed out by the example of an actual smart meter immunity test that smart grid components may exhibit susceptibilities that do not necessarily follow a resonance pattern and, additionally, can be narrowband. As a consequence it is suggested to supplement the present frequency domain test methods by time domain tests which utilize damped sinusoidal excitations with corresponding spectra that properly cover the frequency range 2-150 kHz, as exemplified by the military standard MIL-STD-461.

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“…Both the location of items (that support appreciable induced surface currents) concealed on the human body and the nature of these concealed items can be determined by making use of the well known and characteristic ringing that occurs when these items are excited with radiation that matches their resonant frequencies [25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

On Body Concealed Weapon Detection Using a Phased Antenna Array

Harmer¹,

Cole²,

Bowring³

et al. 2012

PIER

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Abstract-The detection and identification of metal items and, in particular weapons, of linear size ≥ 10 cm, concealed upon the human body, is demonstrated as being entirely feasible by using a phased array of suitably ultra wide band transceivers. The complex natural resonances and especially the fundamental resonance, are excited by ultra wide band, stepped frequency continuous wave illumination of the target, using a phased array of antennae to focus the radiation. Broadband illumination of the target with microwave radiation of suitable frequency range (Typically 0.3-3 GHz for handgun sized objects) excites low order complex natural resonances and the late time response of the concealed item can be spatially located using phased array imaging techniques. Further processing of the late time response enables classification of the concealed object, based on the complex natural resonant frequencies of the object, so that threat items such as handguns and knives can be differentiated from benign items such as mobile phone handsets and cameras.

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Characterization of Perfectly Conducting Targets in Resonance Domain With Their Quality of Resonance

Cited by 9 publications

References 22 publications

Resonance Behavior of Radar Targets With Aperture: Example of an Open Rectangular Cavity

Resonance Behavior of Radar Targets With Aperture: Example of an Open Rectangular Cavity

Frequency versus time domain immunity testing of Smart Grid components

On Body Concealed Weapon Detection Using a Phased Antenna Array

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