The use of pseudorandom sweeps to reduce interference noise in simultaneous Vibroseis surveys

Nasreddin, Hayan; Dean, Tim; Iranpour, K.

doi:10.1071/aseg2012ab256

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…Iranpour, Eriksson and Hoerline () (see also Eriksson and Horlin , Iranpour, Eriksson and Hoerline and Nasreddin, Dean and Iranpour ) begin with a random binary sequence which they then perturb using a simulated annealing algorithm. The method can be used to generate individual sweeps with optimum autocorrelation wavelets or sets of sweeps with optimum cross‐correlation characteristics in the time window of interest.…”

Section: Pseudorandom Sweep Designmentioning

confidence: 99%

The use of pseudorandom sweeps for vibroseis surveys

Dean¹

2013

Geophysical Prospecting

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A B S T R A C TPseudorandom vibroseis sweeps have long been suggested as an alternative to standard linear sweeps due to their potential for having superior orthogonality, a lower likelihood for infrastructure damage, and increased low-frequency content. In the past, they were also attractive as they have a better autocorrelation shape, although that is less important today. Their use has been limited but the increasing popularity of simultaneous acquisition techniques has rekindled interest as they offer the ability to reduce interference noise. A wide variety of methods for generating pseudorandom sweeps have been developed over the last 45 years. This paper gives an overview of the motivations for their use before classifying and describing the different sweep types. Finally, the sweeps will be compared in terms of their major attributes including their suitability for simultaneous surveys.

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Section: Pseudorandom Sweep Designmentioning

confidence: 99%

The use of pseudorandom sweeps for vibroseis surveys

Dean¹

2013

Geophysical Prospecting

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“…However, pseudorandom vibroseis sweeps have long been suggested as an alternative to standard linear sweep due to their potential for using superior orthogonality, [4,5] a lower likelihood for damaging infrastructure and increasing lowfrequency content and pseudorandom signals are attractive as they have a better autocorrelation shape, they have the ability to reduce interference noise. [6,7] Nasreddin et al applied pseudorandom signal coding to simultaneous vibroseis data, [8] which resulted in improving data quality and greater sampling efficiency. Sallas et al and Maxwell et al applied similar pseudorandom coding to low-frequency vibroseis data, which resulted in improvements to temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Design and Application of Pseudorandom Coded Sweep for Mini-SOSIE

Chen¹,

Li²,

Long³

et al. 2016

Proceedings of the International Conference on Promotion of Information Technology (ICPIT 2016)

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The miniaturized, high-energy-output mini-SOSIE has become an important source in seismic exploration. It has seriously impeded resolution because of the coherent vibration frequency and periodical problem of the signal. In order to solve these problems, this paper designed a vibrator signal generator. In this paper, a pseudorandom coding technique is tested as a sweep control method for mini-SOSIE. The pseudorandom coding sequence is produced by Matlab and is of good auctocorrelation characteristic. By comparing experimental field data from sources which is controlled by pseudorandom coding method and the rammer, the pseudorandom scheme yields significant improvements, and greatly improved signal-to-noise (SNR) and resolution.

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Multibeam Echosounder With Orthogonal Waveforms: Feasibility and Potential Benefits

Blachet

Austeng

Aparicio

et al. 2021

IEEE J. Oceanic Eng.

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Modern multibeam echosounders (MBE) employ frequency-division techniques (FDT) to ensonify multiple sectors within the same ping cycle. This leads to improved performance in coverage rate, and yaw and pitch stabilization. However, it introduces a bias among sectors because MBES systems are frequency dependent. It also reduces the maximum pulse bandwidth compared to a single-sector sonar. In this study, we consider the code-division technique (CDT) as a solution to this problem. A set of orthogonal coded pulses are received within the same frequency band, and each sector is separated with a matched filter. We assess the feasibility of the technique through two stages. 1) First, we formulate an analytical model describing the power and crosstalk budgets of any multisector MBES. The model can then be used to design transmission sequences fitting these budgets. 2) Then, we display the practical usage of the technique for MBES imaging and mapping through simulated case studies. For the same total timebandwidth budget, we compare the performance of FDT, CDT, and multicarrier CDT (MC-CDT), a hybrid method employing CDT and FDT, which is robust to strong dynamic backscatter. This study considers only bottom detection based on signal amplitude. Our results show that it is possible to share a larger frequency bandwidth between multiple sectors while maintaining an acceptable bottom detection performance similar to FDT. Our choice of time-bandwidth product with CDT offers a crosstalk suppression of −25 dB between sectors, but may display low-magnitude residual artefacts in the water-column data. MC-CDT provides a significant gain of pulse bandwidth while it offers interband separation performance comparable to FDT and reduces significantly the water-column artefacts.

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The use of pseudorandom sweeps to reduce interference noise in simultaneous Vibroseis surveys

Cited by 6 publications

References 11 publications

The use of pseudorandom sweeps for vibroseis surveys

The use of pseudorandom sweeps for vibroseis surveys

Design and Application of Pseudorandom Coded Sweep for Mini-SOSIE

Multibeam Echosounder With Orthogonal Waveforms: Feasibility and Potential Benefits

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