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伪随机码调制的高精度星载激光测距雷达

Han Xu, Li Zhi,Wu Yaojun, Zhang Zhimin,Huang Jianbin,Huang Longfei

Infrared and Laser Engineering(2022)

中国空间技术研究院

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Abstract
伪随机码调制激光测距系统通过发射高阶调制激光,实现高频率、低峰值功率探测,利用高频率探测和统计实现高信噪比,具有系统体积小、质量轻的特点,是一种适合远距离的激光雷达系统.但是测距精度与调制频率有关,以往研究中通常使用高调制频率实现高精度测量.文中研制了一台伪随机码调制的激光雷达样机,采用调制重复频率100 MHz、入瞳直径0.1 m的光学天线,通过对周期内回波信号进行高斯统计,在信噪比为5时的实验室环境下实现了 0.1 m的高精度测距.通过理论和试验分析证明了通过提高时钟频率和信噪比可以有效提高测距精度.
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