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相关概念视频

Bandpass Sampling01:17

Bandpass Sampling

183
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
183
Upsampling01:22

Upsampling

238
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
238
Aliasing01:18

Aliasing

139
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
139
Sampling Theorem01:15

Sampling Theorem

345
In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
345
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

251
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
251
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

214
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
214

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Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
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通过两步采样方法实现强大的压缩传感地震采集.

Anna Titova1, Michael B Wakin2, Ali C Tura1

  • 1Department of Geophysics, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA.

Sensors (Basel, Switzerland)
|December 9, 2023
PubMed
概括

本研究介绍了一种两步方法,用于设计使用压力传感 (CS) 的地震调查. 这种方法创造了高效的采样模式,改善了地震数据的获取和分析,用于现场应用.

科学领域:

  • 地质物理学 地质物理学
  • 信号处理 信号处理
  • 地震调查设计 设计 地震调查设计

背景情况:

  • 传统的地震调查通常需要密集的,无别名的采样,这可能是昂贵的和物流上具有挑战性的.
  • 压缩传感 (CS) 为采集信号提供了一个框架,采集率低于传统方法.
  • 设计基于CS的地震采集需要专门的采样模式,满足理论要求和实际约束.

研究的目的:

  • 提出和评估一种新的两步设计流程,用于生成基于压力传感的地震采样方案.
  • 确保生成的采样模式符合CS理论属性,同时控制空间采样特征.
  • 为了证明拟议方法的适用性和稳定性,用于实际的3D地震调查设计.

主要方法:

  • 采用了两步采样策略:以受限制的同位素属性为指导的初始统一随机采样,其次是有针对性的样本添加.
  • 第二步,由零空间属性证明,添加样本来控制相邻源或接收器之间的最大距离.
  • 该方法允许对活跃和省略的样本进行灵活的控制,并通过重新分配的样本和CS重建来测试其稳定性.

主要成果:

  • 提出的两步采样方法成功生成了具有强大的CS理论基础的地震采样模式.
  • 该方法可控制相邻采样点之间的最大距离,并允许灵活的样本分配.
关键词:
压力感应感应 压力感应感应地震收购的地震收购.信号采样采样信号采样调查设计调查设计调查设计

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  • CS重建测试和对设计的3D地震调查 (折叠地图,图) 的分析证实了两步方案的适用性.

    • 结论:

    • 开发的两步采样设计对于创建基于压力传感的地震采集方案是有效的.
    • 该方法平衡了理论的CS要求与实际的地质物理和后勤考量,用于地震调查.
    • 提出的方法适用于基于CS的地震调查,并证明在现场应用中具有实际实用性.