A Match-filter Approach for Q Estimation and Compensation after Depth Migration

2018 ◽  
Author(s):  
M. Cavalca ◽  
R.P. Fletcher
Keyword(s):  
Depth Migration ◽  
Match Filter ◽  
Filter Approach

True‐amplitude migration taking fine layering into account

Geophysics ◽  
1996 ◽  
Vol 61 (3) ◽  
pp. 795-803 ◽  
Author(s):  
C. P. A. Wapenaar ◽  
F. J. Herrmann
Keyword(s):  
Matched Filter ◽  
Correction Term ◽  
Angle Of Incidence ◽  
Central Process ◽  
Depth Migration ◽  
Reflection Data ◽  
Filter Approach ◽  
Amplitude Variation With Angle ◽  
Phase Distortions ◽  
Wavefield Extrapolation

The central process in wave‐equation—based depth migration is inverse wavefield extrapolation. The commonly applied matched filter approach to inverse wavefield extrapolation ignores the angle‐dependent amplitude and phase distortions that are related to fine layering. This may result in dispersed images and erroneous amplitude variation with angle of incidence (AVA) effects. “Power reciprocity” formulates a relation between transmitted and reflected wavefields. It provides the basis for a modified matched filter that does account for the aforementioned distortions. The correction term by which the matched filter is modified can be derived directly from the reflection data. With this modified matched filter, prestack depth migration will yield nondispersed images with correct AVA behavior.

A Filter Approach Using Earnings Relatives

1969 ◽  
Vol 25 (6) ◽  
pp. 61-61, 63-64
Author(s):  
Alex Gould ◽  
Maurice Buchsbaum
Keyword(s):  
Filter Approach

Narratives of Queer Migration

2020 ◽  
Author(s):  
John Gray ◽  
Mike Baynham
Keyword(s):  
The European Union ◽  
Spatial Mobility ◽  
Class Politics ◽  
Depth Migration ◽  
Different Types ◽  
Global North ◽  
Economic Necessity ◽  
The Village ◽  
The City

This chapter considers the phenomenon of queer migration from a linguistic perspective, paying particular attention to the constitutive role of spatial mobility in narrative and its role in the construction of queer migrant identities. The chapter begins by looking at the way in which queer migration has been discussed in the literature and then moves on to address three different types of queer migration in greater depth: migration within national borders from the village/countryside to the city; migration between cities in member states within the context of the European Union; and finally, asylum-seeking within the context of migration from the Global South to the Global North. The chapter concludes by suggesting that queer migration is a complex phenomenon in which the intersection of sexuality, gender identity, desire, affect, abjection, economic necessity, class, politics, and fear for one’s life combine in ways that are unique in the lives of individual migrants.

scholarly journals Optimizing Transmit Sequence and Instrumental Variables Receiver for Dual-Function Complexity System

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yu Yao ◽  
Junhui Zhao ◽  
Lenan Wu
Keyword(s):  
Approximate Solution ◽  
Instrumental Variables ◽  
Performance Index ◽  
Dual Function ◽  
Np Hard ◽  
Match Filter ◽  
Filter Output ◽  
Phase Code ◽  
Discrete Phase ◽  
Simulation Results

This correspondence deals with the joint cognitive design of transmit coded sequences and instrumental variables (IV) receive filter to enhance the performance of a dual-function radar-communication (DFRC) system in the presence of clutter disturbance. The IV receiver can reject clutter more efficiently than the match filter. The signal-to-clutter-and-noise ratio (SCNR) of the IV filter output is viewed as the performance index of the complexity system. We focus on phase only sequences, sharing both a continuous and a discrete phase code and develop optimization algorithms to achieve reasonable pairs of transmit coded sequences and IV receiver that fine approximate the behavior of the optimum SCNR. All iterations involve the solution of NP-hard quadratic fractional problems. The relaxation plus randomization technique is used to find an approximate solution. The complexity, corresponding to the operation of the proposed algorithms, depends on the number of acceptable iterations along with on and the complexity involved in all iterations. Simulation results are offered to evaluate the performance generated by the proposed scheme.

Split-step complex Padé-Fourier depth migration

2007 ◽  
Vol 171 (3) ◽  
pp. 1308-1313 ◽  
Author(s):  
Linbin Zhang ◽  
James W. Rector ◽  
G. Michael Hoversten ◽  
Sergey Fomel
Keyword(s):  
Depth Migration

scholarly journals Combining Mechanistic Modeling and Raman Spectroscopy for Monitoring Antibody Chromatographic Purification

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 683 ◽  
Author(s):  
Feidl ◽  
Garbellini ◽  
Luna ◽  
Vogg ◽  
Souquet ◽  
...  
Keyword(s):  
Experimental Data ◽  
Raman Spectroscopy ◽  
Estimation Procedure ◽  
Mechanistic Modeling ◽  
Spectroscopic Techniques ◽  
Chromatographic Purification ◽  
On Line ◽  
Filter Approach ◽  
Underlying Mechanisms ◽  
Combining Information

Chromatography is widely used in biotherapeutics manufacturing, and the corresponding underlying mechanisms are well understood. To enable process control and automation, spectroscopic techniques are very convenient as on-line sensors, but their application is often limited by their sensitivity. In this work, we investigate the implementation of Raman spectroscopy to monitor monoclonal antibody (mAb) breakthrough (BT) curves in chromatographic operations with a low titer harvest. A state estimation procedure is developed by combining information coming from a lumped kinetic model (LKM) and a Raman analyzer in the frame of an extended Kalman filter approach (EKF). A comparison with suitable experimental data shows that this approach allows for the obtainment of reliable estimates of antibody concentrations with reduced noise and increased robustness.

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