A time domain technique for mechanism extraction

Dominek, A.; Peters, L.; Burnside, W. D.

doi:10.1109/tap.1987.1144086

Cited by 22 publications

(7 citation statements)

References 8 publications

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“…Consider a sufficiently generalized waveform at wavefront or as (8) where is time independent, , and is the position of the scattering center ( is the distance). The corresponding asymptotic time-harmonic field behaves as (9) where and is the Gamma function [1]. The field behavior near is related to the time-harmonic behavior for as shown in (8) and (9).…”

Section: G Ir Of Scattering Centermentioning

confidence: 90%

“…One simple nature approach to extract the scattering mechanisms [9]- [13] such as and in (5) was to transform the swept frequency signature into the time domain using the windowed IFT [9]. The frequency-domain signature of each individual scattering center, e.g., or , was obtained using a time gating window around the desired transformed scattering center and then transforming back into the frequency domain.…”

Section: E Mechanism Extraction Approachmentioning

confidence: 99%

“…is due to two almost simultaneous quadruple diffractions (from consecutive edges 2-1-2-1 and 1-2-1-2) and, thus, of and arrives at time delay . A lot of approaches can be used to decompose the total scattered field into spectra for the individual mechanisms [9]. All these approaches [7]- [13] use the same idea of relative time delay between the various scattering centers to isolate one mechanism from another.…”

Section: F Multiple Edge Diffractions For a Canonical Configuration-mentioning

confidence: 99%

“…The relative time delay is contained in the relative phase for each scattering center and it is related to its physical location on the scattering object. The individual mechanisms are a unique character relative to one another though they acts as a function of frequency for fixed aspect angle [9].…”

Section: F Multiple Edge Diffractions For a Canonical Configuration-mentioning

confidence: 99%

“…The frequency independence assumption is implied in the Turin model widely adopted in wireless communications []. However, this assumption is not true for a UWB wireless system [7], [8], being modeled as analogous to the radar target identification [9]- [13]. The fundamental difference between a narrowband and UWB multipath model is that in the UWB model each path will have its own IR or frequency transfer characteristics that is frequency Manuscript received September 10, 2001; revised June 15, 2002.…”

Section: Introductionmentioning

confidence: 99%

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A study of the ultra-wideband wireless propagation channel and optimum UWB receiver design

Qiu¹

2002

IEEE J. Select. Areas Commun.

178

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The paper addresses a crucial point in ultra-wideband (UWB) radio wave propagation, which is the spatial-temporal resolution of scattering objects into multiple frequency-dependent scattering centers. The effect contributes to the widely observed temporal dispersion of pulse-shaped transmit signals and their distortion, respectively. Particularly the latter is explained by (multiple) diffraction of the incident wave, leading to (multiple) band-limited impulse responses with characteristic frequency content, which in turn causes signal distortion and a degradation of the signal-to-noise ratio in a correlation receiver. We presented a new approach on UWB propagation modeling and optimum design of correlation receivers.

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Section: G Ir Of Scattering Centermentioning

confidence: 90%

Section: E Mechanism Extraction Approachmentioning

confidence: 99%

Section: F Multiple Edge Diffractions For a Canonical Configuration-mentioning

confidence: 99%

Section: F Multiple Edge Diffractions For a Canonical Configuration-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A study of the ultra-wideband wireless propagation channel and optimum UWB receiver design

Qiu¹

2002

IEEE J. Select. Areas Commun.

178

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High resolution time‐domain measurements of signals with an exponential amplitude frequency dependence

Ohshima

Ogawa

Itoh

1996

Electron. Comm. Jpn. Pt. I

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The timedomain measurement using themltiplication @ &ssification (MUSIC) algorithm is effective for measuring various electromagnetic circuits and antennas as well as for analysis of electromagnetic wave scattering due to its high resolution. However, conventional methods have been based on the assumption that each signal does not have any frequency dependence other than phase delay proportional to the frequency originating from delay time. Hence, such an assumption cannot be satisfied in the case of diffraction coefficients such as those in the case of electromagnetic wave scattering. In this paper, the solution to this probIem is proposed by application of the procedure based on the improvement of the Root MUSIC algorithm for the signals withexponential amplitude frequency dependence. In the exponential frequency dependence of e-. f, a is considered to be an unknown parameter. Delay time and a are estimated simultaneously by means of the modified Root MUSIC algorithm. It is shown that the frequency dependences of the specular return and the creeping wave of a conducting sphere are estimated with sufficiency accuracy.

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Scattering parameter estimation accuracy of root‐MUSIC algorithms in electromagnetic wave scattering measurements

Yamada

Yamamoto

Yamaguchi

et al. 1996

Electron Comm Jpn Pt II

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An application of the superresolution method for the analysis of the electromagnetic scattering data is expected to be effective for experimental verification of the geometrical optics approximation theory and the analysis of multiple paths. There exist many techniques for the superresolution method. It is desirable to select an appropriate technique based upon the characteristics of the individual algorithms. Among these techniques, the Root-MUSIC method has been proposed; this method enables treatment of the signal attenuating exponentially with respect to frequency. In the modified Root-MUSIC method, arbitrary frequency characteristics can be treat- ed.This paper investigates the estimation accuracy of the scattering center and the attenuation coefficient when the Root-MUSIC method and the modified Root-MUSIC method are applied to the estimation of scattering. With the backscattering data of a conducting sphere, the estimation accuracy of the scattering parameters versus the signal-to-noise ratio (SNR) and the number of snapshots is investigated by computer simulation. As a result, it is found that the estimation accuracy of the modified Root-MUSIC method is much better than that of the conventional Root-MUSIC method in the case of a low SNR and a small number of snapshots. Experimental results are also reported.

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A time domain technique for mechanism extraction

Cited by 22 publications

References 8 publications

A study of the ultra-wideband wireless propagation channel and optimum UWB receiver design

A study of the ultra-wideband wireless propagation channel and optimum UWB receiver design

High resolution time‐domain measurements of signals with an exponential amplitude frequency dependence

Scattering parameter estimation accuracy of root‐MUSIC algorithms in electromagnetic wave scattering measurements

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