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Photon counting chirped amplitude modulation lidar using an asymmetric triangular wave modulation

机译：使用非对称三角波调制的光子计数chi调幅激光雷达

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We propose a novel strategy of asymmetric triangular-wave modulation for photon-counting chirped amplitude modulation (PCCAM) lidar. Earlier studies use the symmetric triangle wave modulation, by which the velocity can be detected only when the Doppler shift caused by a moving target is greater than Full Width Half Maximum (FWHM) of Intermediate Frequency (IF). We use an alternative method known as the asymmetric triangular wave modulation method, in which the modulation rates of the up-ramp and the down-ramp are different. This new method avoids the overlapping of the up-ramp and the down-ramp IF peaks, and breaks the limit of the FWHM of IF peak to improve the velocity measuring sensitivity (also called the minimum detectable velocity). Finally, a proof-of-principle experiment is carried out in the laboratory. The experimental results agree well with the theoretical results and show the improvement of the minimum detectable velocity.
机译：我们提出了一种用于光子计数modulation幅度调制（PCCAM）激光雷达的非对称三角波调制的新策略。较早的研究使用对称三角波调制，仅当由移动目标引起的多普勒频移大于中频（IF）的半角全宽（FWHM）时，才可以检测到该速度。我们使用一种称为非对称三角波调制方法的替代方法，其中上斜坡和下斜坡的调制速率不同。这种新方法避免了上升和下降中频峰的重叠，并且打破了中频峰的FWHM的极限，从而提高了速度测量的灵敏度（也称为最小可检测速度）。最后，在实验室中进行了原理验证实验。实验结果与理论结果吻合良好，表明最小可探测速度有所提高。

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