scholarly journals Deghosting, Demultiple, and Deblurring in Controlled-Source Seismic Interferometry

2011 ◽  
Vol 2011 ◽  
pp. 1-28 ◽  
Author(s):  
Joost van der Neut ◽  
Maria Tatanova ◽  
Jan Thorbecke ◽  
Evert Slob ◽  
Kees Wapenaar
Keyword(s):  
Point Spread Function ◽  
Cross Correlation ◽  
Velocity Model ◽  
Seismic Interferometry ◽  
Controlled Source ◽  
Point Spread ◽  
Spread Function ◽  
Different Types

With controlled-source seismic interferometry we aim to redatum sources to downhole receiver locations without requiring a velocity model. Interferometry is generally based on a source integral over cross-correlation (CC) pairs of full, perturbed (time-gated), or decomposed wavefields. We provide an overview of ghosts, multiples, and spatial blurring effects that can occur for different types of interferometry. We show that replacing cross-correlation by multidimensional deconvolution (MDD) can deghost, demultiple, and deblur retrieved data. We derive and analyze MDD for perturbed and decomposed wavefields. An interferometric point spread function (PSF) is introduced that can be obtained directly from downhole data. Ghosts, multiples, and blurring effects that may populate the retrieved gathers can be locally diagnosed with the PSF. MDD of perturbed fields can remove ghosts and deblur retrieved data, but it leaves particular multiples in place. To remove all overburden-related effects, MDD of decomposed fields should be applied.

scholarly journals Controlled-source interferometric redatuming by crosscorrelation and multidimensional deconvolution in elastic media

Geophysics ◽  
2011 ◽  
Vol 76 (4) ◽  
pp. SA63-SA76 ◽  
Author(s):  
Joost van der Neut ◽  
Jan Thorbecke ◽  
Kurang Mehta ◽  
Evert Slob ◽  
Kees Wapenaar
Keyword(s):  
Wave Propagation ◽  
Velocity Model ◽  
Seismic Sources ◽  
Elastic Media ◽  
Virtual Source ◽  
Controlled Source ◽  
Point Spread ◽  
Spread Function ◽  
Wavefield Decomposition

Various researchers have shown that accurate redatuming of controlled seismic sources to downhole receiver locations can be achieved without requiring a velocity model. By placing receivers in a horizontal or deviated well and turning them into virtual sources, accurate images can be obtained even below a complex near-subsurface. Examples include controlled-source interferometry and the virtual-source method, both based on crosscorrelated signals at two downhole receiver locations, stacked over source locations at the surface. Because the required redatuming operators are taken directly from the data, even multiple scattered waveforms can be focused at the virtual-source location, and accurate redatuming can be achieved. To reach such precision in a solid earth, representations for elastic wave propagation that require multicomponent sources and receivers must be implemented. Wavefield decomposition prior to crosscorrelation allows us to enforce virtual sources to radiate only downward or only upward. Virtual-source focusing and undesired multiples from the overburden can be diagnosed with the interferometric point-spread function (PSF), which can be obtained directly from the data if an array of subsurface receivers is deployed. The quality of retrieved responses can be improved by filtering with the inverse of the PSF, a methodology referred to as multidimensional deconvolution.

scholarly journals The cross-correlation search for a hot spot of gravitational waves : Numerical study for point spread function

2012 ◽  
Vol 363 ◽  
pp. 012040
Author(s):  
Yuta Okada ◽  
Nobuyuki Kanda ◽  
Sanjeev Dhurandhar ◽  
Hideyuki Tagoshi ◽  
Hirotaka Takahashi
Keyword(s):  
Gravitational Waves ◽  
Point Spread Function ◽  
Cross Correlation ◽  
Numerical Study ◽  
Hot Spot ◽  
Point Spread ◽  
Spread Function ◽  
The Cross ◽  
Correlation Search

Point Spread Function For Elliptical Aperture Inclined at /4 angle with x-axis

2014 ◽  
Vol 5 (2) ◽  
pp. 767-777
Author(s):  
Sundus Y. Hasan ◽  
Widad H. Tarkhan
Keyword(s):  
Point Spread Function ◽  
Spherical Aberration ◽  
Point Spread ◽  
Spread Function ◽  
Different Types ◽  
Coma Aberration

Point spread function (PSF) for inclined elliptical aperture with an angle equal to p/4 with x-axis has been studied, by taking new coordinates m and n which are rotated by an angle p/4 to x and y- axes.The properties of the obtained image have been found in different cases, for diffraction limited system and different types of aberrations, like focus error, spherical aberration and coma aberration.

Point spread function based feature optimization and fusion for underwater objet recognition

2013 ◽  
Vol 26 (11) ◽  
pp. 944-952 ◽  
Author(s):  
Huibin Wang ◽  
Rong Zhang ◽  
Zhe Chen ◽  
Lizhong Xu ◽  
Jie Shen
Keyword(s):  
Point Spread Function ◽  
Point Spread ◽  
Spread Function ◽  
Feature Optimization

Determination of the Point Spread Function of a Computer-Generated Lens Formed by a Phase Light Modulator

2020 ◽  
Vol 128 (7) ◽  
pp. 1036-1040 ◽  
Author(s):  
N. G. Stsepuro ◽  
G. K. Krasin ◽  
M. S. Kovalev ◽  
V. N. Pestereva
Keyword(s):  
Point Spread Function ◽  
Light Modulator ◽  
Point Spread ◽  
Spread Function

Accurate point spread function (PSF) estimation for coded aperture cameras

2014 ◽  
Author(s):  
Jingyu Yang ◽  
Bin Jiang ◽  
Jinlong Ma ◽  
Yi Sun ◽  
Ming Di
Keyword(s):  
Point Spread Function ◽  
Coded Aperture ◽  
Point Spread ◽  
Spread Function ◽  
Psf Estimation
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