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相关概念视频

Upsampling01:22

Upsampling

236
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...
236

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相关实验视频

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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在相位激光测距中优化不足样本的相位检测精度.

Yingling Pan, Rongyi Ji, Ziqi Xie

    Applied optics
    |March 4, 2024
    PubMed
    概括

    在相位激光测距下低采样简化了电路. 新的选择标准通过优化采样参数来提高准确性,提高没有复杂算法的相位检测.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 信号处理 信号处理

    背景情况:

    • 采样不足可以减少相位激光测距系统的复杂性.
    • 保持高调制频率对于准确的测距至关重要.

    研究的目的:

    • 为不足样本参数提出新的选择标准,以提高相位激光测距的精度.
    • 优化信号频率,采样频率和计算点,以提高性能.

    主要方法:

    • 通过将采样点设置为2的整数次数 (2^n,n=2-6),研究了整数周期性采样.
    • 使用杆计算周期和阶段平均值的非整体定期采样进行了探索.
    • 通过数学推导和计算机模拟来验证标准.

    主要成果:

    • 优化了整数周期性采样准确度,使用整数二次数采样点.
    • 通过杆期和阶段平均化提高非整体周期性采样准确性.
    • 在不足采样范围系统中,在相位检测准确度方面显著改善.

    结论:

    • 拟议的选择标准有效地提高了采样不足激光测距的相位检测精度.
    • 在不需要预处理或算法修改的情况下,可以实现精度提升.

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  • 这些标准提供了一种实用方法,用于在各种应用中优化不足采样策略.