Reduction of Harmonic Distortion in Vibratory Source Records*

Rietsch, E.

doi:10.1111/j.1365-2478.1981.tb00400.x

Cited by 33 publications

(19 citation statements)

References 4 publications

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“…In this paper, the harmonic whose instantaneous frequency is double the fundamental component of the signal is referred to as second harmonic. The method proposed by Sorkin (1972) to suppress harmonics and its generalization developed by Rietsch (1981), which is often referred to as variphase, requires several consecutive sweeps. Each of the M sweeps that compose the sequence has an initial phase differing from that of the previous one by the phase angle 2π/ M .…”

Section: Features and Limitations Of The Vibroseis Methodsmentioning

confidence: 99%

Acquisition and processing of simultaneous vibroseis data

Bagaini

2009

Geophysical Prospecting

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Numerous methods have been developed in the past three decades to speed up vibroseis acquisition. This paper gives an overview of the most promising ones and proposes a classification of them into three categories: simultaneous shooting, cascaded sweeps and slip‐sweep. The principles upon which these methods are based, the processing techniques developed to separate the simultaneously acquired data and their main features are also discussed. Finally, some criteria for the selection of the most suitable methods for the acquisition and the separation stages are proposed.

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Section: Features and Limitations Of The Vibroseis Methodsmentioning

confidence: 99%

Acquisition and processing of simultaneous vibroseis data

Bagaini

2009

Geophysical Prospecting

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“…Sorkin (1972) proposed a technique to suppress harmonics and its generalized developed by Rietsch (1981) that requires several consecutive sweeps. Sorkin's technique depends on phase difference between consecutive sweeps.…”

Section: Ov E Rv I E W O F V I B Ro S E I S a C Q U I S I T I O N A Nmentioning

confidence: 99%

Eliminating upper harmonic noise in vibroseis data via numerical simulation

el-aal

2010

Geophysical Journal International

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SUMMARY In conventional vibroseis signal processing, algorithms including cross‐correlation and deconvolution are applied to convert the raw trace data into a seismic section. However, their performance deteriorates when the trace data are corrupted by the harmonic noise. An important issue of vibroseis data enhancement is the treatment or suppression upper harmonics. In this contribution, I present algorithm to eliminate the harmonic distortion, all at once, in both down‐ and up‐sweep conventional vibroseis data using a simulation process for harmonic distortion in the correlated data. This technique consists of four steps: (1) cross‐correlating the raw data with fundamental sweep then dividing the trace to several windows and detecting the windows contain fundamental energy for each response reflector; (2) calculating the harmonic amplitude ratio when applying the Fourier transform on the upper harmonic components and the fundamental, and dividing the upper harmonic components by the fundamental to remove the unknown convolutional effects; (3) using the harmonic amplitude ratio to simulate the upper harmonics associated with the fundamental energy in down‐ and up‐sweep data. When the harmonic amplitude ratio is convolved with a portion of data containing the fundamental energy in the correlated data in time domain, I can get simulation for the upper harmonics existed in the original data and (4) subtracting the simulated harmonics from correlated traces using direct optimization procedure. Accordingly, I developed a procedure for attenuating upper harmonics in the positive and negative times of the correlated traces depending on accurate simulation for the correlated harmonics. The procedure was tested on both synthetic and field data sets. The correlated trace thus obtained will be freed substantially of correlation noise; that is the correlation‐ghost sweeps (produced by severe harmonic distortion at positive and negative correlation times) are eliminated without degrading the seismic information content of the trace.

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“…In terms of the first category, Sorkin (1974) proposed the variphase sweep technique, subsequently generalized by Rietsch (1981) to suppress harmonics that requires several consecutive sweeps. This technique depends on phase difference between consecutive sweeps, it can reduce harmonic noise only with limited success, largely because it is difficult to implement and control with respect to quality.…”

Section: Introductionmentioning

confidence: 99%