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相关概念视频

Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

195
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
195
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

89
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
89
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

81
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
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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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用于FMCW LiDAR的插曲线性化预扭曲技术.

Honggang Chen, Le Zhao, Leilei Hu

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    |March 4, 2024
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    概括
    此摘要是机器生成的。

    这项研究引入了一种用于频率调制连续波 (FMCW) 激光测距的新预扭曲算法. 该方法提高了FMCW LiDAR系统的线性,为汽车应用实现了高精度.

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    科学领域:

    • 光电学是指光电子产品.
    • 激光技术 激光技术 激光技术
    • 激光雷达系统LiDAR系统

    背景情况:

    • 频率调制连续波 (FMCW) 激光测距对于先进的光检测和测距 (LiDAR) 系统至关重要.
    • 分布反激光器为FMCW LiDAR提供了优势,因为它们的调制能力和紧的尺寸.
    • 激光频率调制中的非线性对FMCW LiDAR准确性构成重大挑战.

    研究的目的:

    • 开发一种新的预扭曲算法,以改善用于LiDAR应用的FMCW激光器的线性.
    • 为解决FMCW激光测距中的非线性频率调制问题.
    • 为了提高FMCW LiDAR系统的性能和准确性.

    主要方法:

    • 一个基于插值线性拟合的预扭曲算法被开发出来.
    • 希尔伯特变换被用来获得激光的横扫频率曲线.
    • 曲线被细分和线性地装配,以产生插曲的驱动电流信号,用于线性频率变化.

    主要成果:

    • 实现了一个低于1e-7的非线性误差扫描频率信号.
    • 在FMCW系统中,在100米处显示的距离误差小于±5厘米.
    • 创建了一个高质量的3D静态对象点云.

    结论:

    • 拟议的插值线性拟合预扭曲算法有效地增强了FMCW激光对LiDAR的线性.
    • 这种方法比代装配具有优势,避免错误和复杂性,适合实时汽车LiDAR.
    • 这项技术可以通过FMCW LiDAR系统实现高精度测距和详细的3D成像.