UWB radars in medicine

Staderini, Enrico M.

doi:10.1109/62.978359

Cited by 447 publications

(227 citation statements)

References 9 publications

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“…Proposition 2: For a given set of time-delay measurementŝ τ = [τ 0τ1 · · ·τ N −1 ] modelled by (22), the CRLB for the covariance matrix of an unbiased estimate of θ is the same as the expression in (12), where the FIM is given by (9)- (11).…”

Section: It Can Be Modelled Asτmentioning

confidence: 94%

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Theoretical Limits for Estimation of Vital Signal Parameters Using Impulse Radio UWB

Gezici

Şahinoğlu

2007

2007 IEEE International Conference on Communications

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Abstract-In this paper, Cramer-Rao lower bounds (CRLBs) for estimation of vital signal parameters, such as respiration and heart-beat rates, using ultra-wideband (UWB) pulses are derived. In addition, a simple closed-form CRLB expression is obtained for sinusoidal displacement functions under certain conditions. Moreover, a two-step suboptimal solution is proposed, which is based on time-delay estimation via matched filtering followed by least-squares (LS) estimation. It is shown that the proposed solution is asymptotically optimal in the limit of certain system parameters. Simulation studies are performed to evaluate the lower bounds and performance of the proposed solution for realistic system parameters.Index Terms-Ultra-wideband (UWB), impulse radio (IR), Cramer-Rao lower bound (CRLB), least-squares (LS) estimation.

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Section: It Can Be Modelled Asτmentioning

confidence: 94%

“…In [9], possible medical applications of UWB radars are studied, and their penetration and reflection properties are investigated. In [10], respiratory detection of hidden humans using UWB signals is implemented.…”

Section: Introduction After the Us Federal Communications Commissimentioning

confidence: 99%

Theoretical Limits for Estimation of Vital Signal Parameters Using Impulse Radio UWB

Gezici

Şahinoğlu

2007

2007 IEEE International Conference on Communications

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“…Use of UWB signals for vital signal monitoring facilitates many medical applications, such as respiratory activity monitoring in intensive care units, cardiac monitoring, sudden infant death syndrome detection and arterial-wall motion monitoring [24]. In addition to noninvasive monitoring applications, estimation of vital (medical) signal parameters can be very important in many other scenarios, such as searching people under debris after an earthquake and through-the-wall health monitoring of hostages [23].…”

Section: Introductionmentioning

confidence: 99%

“…In [24], possible medical applications of UWB signals are studied, and their penetration and reflection properties are investigated. In [25] and [26], estimation of respiration and heartbeat rates via UWB signals is studied experimentally.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Limits for Estimation of Periodic Movements in Pulse-Based UWB Systems

Gezici

2007

IEEE J. Sel. Top. Signal Process.

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Abstract-In this paper, Cramer-Rao lower bounds (CRLBs) for estimation of signal parameters related to periodically moving objects in pulse-based ultra-wideband (UWB) systems are presented. The results also apply to estimation of vital parameters, such as respiration rate, using UWB signals. In addition to obtaining the CRLBs, suboptimal estimation algorithms are also presented. First, a single-path channel with additive white Gaussian noise is considered, and closed-form CRLB expressions are obtained for sinusoidal object movements. Also, a two-step suboptimal algorithm is proposed, which is based on time delay estimation via matched filtering followed by least-squares estimation, and its asymptotic optimality property is shown in the limit of certain system parameters. Then, a multipath environment is considered, and exact and approximate CRLB expressions are derived. Moreover, suboptimal schemes for parameter estimation are studied. Simulation studies are performed for the estimation of respiration rates in order to evaluate the lower bounds and performance of the suboptimal algorithms for realistic system parameters.Index Terms-Cramer-Rao lower bound (CRLB), estimation theory, impulse radio (IR), least-squares (LS) estimation, matched filtering, ultra-wideband (UWB).

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“…Electromagnetic wave-based imaging is used in a variety of fields, such as medical-and security-related applications [1]. Radar imaging has been an increasing popular research topic due to its ability to show the internal structure of an object while remaining noninvasive [2,3].…”

Section: Introductionmentioning

confidence: 99%

Precision Near-Field Reconstruction in the Time Domain via Minimum Entropy for Ultra-High Resolution Radar Imaging

2017

Remote Sensing

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Ultra-high resolution (UHR) radar imaging is used to analyze the internal structure of objects and to identify and classify their shapes based on ultra-wideband (UWB) signals using a vector network analyzer (VNA). However, radar-based imaging is limited by microwave propagation effects, wave scattering, and transmit power, thus the received signals are inevitably weak and noisy. To overcome this problem, the radar may be operated in the near-field. The focusing of UHR radar signals over a close distance requires precise geometry in order to accommodate the spherical waves. In this paper, a geometric estimation and compensation method that is based on the minimum entropy of radar images with sub-centimeter resolution is proposed and implemented. Inverse synthetic aperture radar (ISAR) imaging is used because it is applicable to several fields, including medicaland security-related applications, and high quality images of various targets have been produced to verify the proposed method. For ISAR in the near-field, the compensation for the time delay depends on the distance from the center of rotation and the internal RF circuits and cables. Required parameters for the delay compensation algorithm that can be used to minimize the entropy of the radar images are determined so that acceptable results can be achieved. The processing speed can be enhanced by performing the calculations in the time domain without the phase values, which are removed after upsampling. For comparison, the parameters are also estimated by performing random sampling in the data set. Although the reduced data set contained only 5% of the observed angles, the parameter optimization method is shown to operate correctly.

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UWB radars in medicine

Cited by 447 publications

References 9 publications

Theoretical Limits for Estimation of Vital Signal Parameters Using Impulse Radio UWB

Theoretical Limits for Estimation of Vital Signal Parameters Using Impulse Radio UWB

Theoretical Limits for Estimation of Periodic Movements in Pulse-Based UWB Systems

Precision Near-Field Reconstruction in the Time Domain via Minimum Entropy for Ultra-High Resolution Radar Imaging

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