State-space spectral estimation of characteristic electromagnetic responses in wideband data

Naishadham, K.; Piou, Jean E.

doi:10.1109/lawp.2005.859386

Cited by 17 publications

(15 citation statements)

References 12 publications

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“…If the SNR value is high enough there would be a sharp transition between singular values of the signal and those of noise. The criterion for separating the two parts is the Akaike information criterion which has been shown to be a reliable model order estimator described in [5,10]. Hence, U, Σ, V * could be divided into two different subspaces as follows,…”

Section: State -Space Representation Of the Signalmentioning

confidence: 99%

Frequency Domain Skin Artifact Removal Method for Ultra-Wideband Breast Cancer Detection

Maskooki¹,

Soh²,

Gunawan³

et al. 2009

PIER

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Abstract-Using ultra-wide band (UWB) microwave pulse for breast cancer detection has been greatly investigated recently since it does not expose the patient to any harmful radiation and the implementation is relatively cheaper than other methods such as MRI or X-ray. An issue in UWB imaging of breast cancer is the strong backscatter from the breast skin which is in orders of magnitude larger than the pulse backscattered from the tumor and should be eliminated before processing the signal for the tumor detection and imaging. At present no existing method can effectively remove this artifact without introducing corruption to the tumor signature. In this paper, a novel method to eliminate this artifact is proposed which employs a frequency domain model to isolate and remove skin related information from the signal. This method is compared with the existing methods of the skin artifact removal in different scenarios. The results show that the new method can overcome the shortcomings of the previous methods and improve the detection of the tumor in the sense of the tumor to clutter response ratio.

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Section: State -Space Representation Of the Signalmentioning

confidence: 99%

Frequency Domain Skin Artifact Removal Method for Ultra-Wideband Breast Cancer Detection

Maskooki¹,

Soh²,

Gunawan³

et al. 2009

PIER

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“…A second contribution of this paper is the rigorous validation of creeping wave scattering using the state space method (SSM) [ Piou , 2005; Naishadham and Piou , 2005; Naishadham and Piou , 2008]. SSM is applied to extract spectral content and synthesize the wideband frequency response of creeping waves from a method of moments (MoM) solution for the scattering by the coated cylinder.…”

Section: Introductionmentioning

confidence: 99%

Analytical characterization and validation of creeping waves on dielectric coated and perfectly conducting cylinders

Naishadham

Piou

2010

Radio Sci.

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[1] Creeping waves play an important role in the analysis of electromagnetic scattering by large objects with curved boundaries. In this paper, an asymptotic model is presented for the back-scattered field on a dielectric-coated cylinder at aspect angles near broadside incidence, a region where the creeping wave has maximum intensity. The monostatic radar cross section is analytically derived from creeping wave poles and their residues, and is validated with data extracted from rigorous method of moments computation of the scattered field by utilizing a novel state space spectral estimation algorithm. Detailed computations reveal a stark contrast between dielectric-coated objects and uncoated metallic ones with regard to creeping wave propagation. Because of smaller curvatureinduced leakage and coherent interaction between incident wave and the dielectric coating, creeping waves, strongly attenuated by metallic objects, become quite pronounced for coated objects. As the frequency increases, the creeping waves are partially trapped inside the dielectric layer and the scattered field becomes quite small. Therefore, in contrast to leakage on a metallic cylinder, which displays smooth monotonic reduction in amplitude with increasing frequency, creeping waves on a coated cylinder exhibit a strong cutoff akin to a guided wave.Citation: Naishadham, K., and J. E. Piou (2010), Analytical characterization and validation of creeping waves on dielectric coated and perfectly conducting cylinders, Radio Sci., 45, RS5014,

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“…In [17], the state space approach is used to process time series data to estimate the frequency and the intensity of the damped sinusoidal signal. In [18][19][20][21], the state space approach based on DE model is used to extract the intensity, the damped rate and the range information of the scattering center. The example of the sine signal recovery used in [22] proved that the state space approach could reduce the sensitivity of parameter estimation to noise.…”

Section: Introductionmentioning

confidence: 99%

“…The state space approach obtains the system poles directly by using matrix singular value decomposition so that the system poles could be anywhere in the z-plane, which means that the intensity of each scattering center can have different frequency-dependent factors. Therefore, it can capture the dynamic wideband behavior of scattering mechanism [19,20]. Meanwhile, the current state space approach has its drawbacks.…”

Section: Introductionmentioning

confidence: 99%

A GTD model and state space approach based method for extracting the UWB scattering center of moving target

Wang

Wei

Sun

et al. 2010

Sci. China Inf. Sci.

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Movements of the scattering center on the condition of ultra-wideband (UWB) will impact the extraction of parameters. This paper presents an approach for extracting the moving targets' UWB scattering center parameters based on the geometrical theory of diffraction (GTD) model and the state space approach. Firstly, the UWB GTD scattering model is transformed into state-space equations in order to estimate the range and range rate through the singular value decomposition. Secondly, the type parameter in the whole bandwidth is indicated dimension-reducedly by orthonormalized basis and estimated by traversal algorithm and minimumnorm algorithm. Finally, the intensity of scattering center is worked out based on the least square method. The paper provides the Cramer-Rao bound (CRB) for parameter estimation. The effectiveness of the approach is verified by computer simulation. The approach can estimate range, range rate, reflection intensity and type parameter simultaneously in order to improve the track of scattering centers and the target identification. CitationWang J, Wei S M, Sun J P, et al. A GTD model and state space approach based method for extracting the UWB scattering center of moving target.

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State-space spectral estimation of characteristic electromagnetic responses in wideband data

Cited by 17 publications

References 12 publications

Frequency Domain Skin Artifact Removal Method for Ultra-Wideband Breast Cancer Detection

Frequency Domain Skin Artifact Removal Method for Ultra-Wideband Breast Cancer Detection

Analytical characterization and validation of creeping waves on dielectric coated and perfectly conducting cylinders

A GTD model and state space approach based method for extracting the UWB scattering center of moving target

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