论文标题
了解相干激光雷达的物理
Understanding the physics of coherent LiDAR
论文作者
论文摘要
连贯的LIDAR（光检测和射程）是一种有希望的3D成像技术，比传统的LiDar系统具有显着优势。除了免疫环境光外，它还通过感测光的多普勒移动来直接测量移动物体的速度，并可以达到特殊的深度精确度。该手稿的目的是用第一原理来解释具有严格衍生的相干激光雷的基本物理。我们首先讨论相干检测的敏感性，并得出可稳定检测激光恢复所需的光子数量。然后，我们将注意力转向相干激光雷的收集效率，并表明信号强度强烈取决于激光束的聚焦程度。
Coherent LiDAR (Light Detecting And Ranging) is a promising 3D imaging technology that provides significant advantages over more traditional LiDAR systems. In addition to being immune to ambient light, it directly measures the velocity of moving objects by sensing Doppler shift of light, and can achieve exceptional depth accuracies. The goal of this manuscript is to explain the basic physics of coherent LiDAR with rigorous derivations from first principles. We first discuss the sensitivity of coherent detection, and derive the number of photons needed to robustly detect a LiDAR return. We then turn our attention to the collection efficiency of coherent LiDAR, and show that signal strength is strongly dependent upon how well the laser beams are focused.
