Aperture Synthesis by Object Rotation in Coherent Imaging

Mensa, D.; Heidbreder, Glenn R.; Wade, G.

doi:10.1109/tns.1980.4330965

Cited by 66 publications

(24 citation statements)

References 9 publications

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“…the window length) defines the number of rays (in CT terms). For each projection, if only the amplitude of the frequency spectrum is used, the method is considered to be incoherent processing [19]. Assuming identical resolution in radial and circumferential directions, the spatial resolution D can be derived [4],…”

Section: Incoherent Processingmentioning

confidence: 99%

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Continuous wave ultrasonic Doppler tomography

et al. 2011

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In continuous wave ultrasonic Doppler tomography (DT), the ultrasonic beam moves relative to the scanned object to acquire Doppler-shifted frequency spectra which correspond to crossrange projections of the scattering and reflecting structures within the object. The relative motion can be circular or linear. These data are then backprojected to reconstruct the two-dimensional image of the object cross section. By using coherent processing, the spatial resolution of ultrasonic DT is close to an order of magnitude better than that of traditional pulse-echo imaging at the same ultrasound frequency.

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Section: Incoherent Processingmentioning

confidence: 99%

“…Spatial resolution. By considering the polar coordinates system (r, Q), the impulse response can be obtained in the spatial domain with polar coordinate (r, u) [19],…”

Section: ð2:4þmentioning

confidence: 99%

Continuous wave ultrasonic Doppler tomography

et al. 2011

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“…G(fx,fy) =f l 9(x,Y)ei2n(fxx fyY)dx dy (12) Equation (12) has been expressed as a two -dimensional Fourier transformation. We would like to be able to invert equation (12) to obtain g(x,y) from a knowledge of G(f ,f ).…”

Section: Coherent Doppler Tomographic Imagingmentioning

confidence: 99%

<title>Pulse Echo And Doppler Reconstructive Tomography</title>

Wade

Mensa

1980

SPIE Proceedings

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In tomography, a cross section of an object is imaged with as little interference as possible from structures not in the cross section.In reconstructive tomography, the image is computed from elementary measured data. Both X rays and nuclear emissions from injected radioactive isotopes are being successfully used in clinical applications at the present time.However, these modalities suffer the disadvantage of being invasive.Fortunately, other forms of energy can also be used in reconstructive tomography, including microwaves and ultrasound.As opposed to X rays, micro and acoustic waves can be reflected, and in this paper we explore methods to obtain images from such reflected waves.Our methods include pulse -echo reconstructive tomography and tomographic extensions of CW Doppler processing.The use of these forms of energy, as opposed to X rays, also permits the possibility of coherent signal generation and processing.In this paper, our emphasis is on Doppler processing. Analysis is presented as well as experimental verification of the analysis.It is both theoretically and experimentally shown that high -quality reconstruction of object points can be obtained. Two equal points separated by a quarter wavelength may be resolved in the case of the coherent Doppler tomography.

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“…공통적으로는 거리(range) 방향의 해 상도가 송신 주파수의 대역폭에 비례한다 [2] . 표적의 운동 을 인위적으로 생성하기 위해서 일정하게 회전하는 턴테 이블(turn table)을 이용하는 방법들이 제안되어왔다 [3]～ [5] .…”

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A Method of ISAR Geometric Calibration for Point Target Using Impulse-Radio UWB

Yu¹,

Никитин²,

Paek³

et al. 2015

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, a method of ISAR geometric calibration is represented by using impulse-radio UWB radar. The ir-UWB is good for using a signal processing in time domain, so, it does not occur a multi-path or coupling problem. If a signal that between antennas and target is assumed a plane wave, a center of rotation in ISAR geometry model can be estimated by using point target. Before image is reconstructed with sinogram, the center of rotation can be calculated by using least square fitting. This method can be obtained a more contrast image, and a maximum value of entropy of image. The method, that estimates a center of rotation in received data, will be used a initial setup of instruments or a periodic compensation to reconstruct image. It would be useful in medical, security and surveillance imaging equipments that have a fixed geometry.

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Aperture Synthesis by Object Rotation in Coherent Imaging

Cited by 66 publications

References 9 publications

Continuous wave ultrasonic Doppler tomography

Continuous wave ultrasonic Doppler tomography

<title>Pulse Echo And Doppler Reconstructive Tomography</title>

A Method of ISAR Geometric Calibration for Point Target Using Impulse-Radio UWB

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