| 伪随机码调制的高精度星载激光测距雷达 |
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| 引用本文： | 韩旭,李志,吴耀军,张志民,黄剑斌,黄龙飞. 伪随机码调制的高精度星载激光测距雷达[J]. 红外与激光工程, 2022, 51(3): 20210250-1-20210250-9. DOI: 10.3788/IRLA20210250 |
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| 作者姓名： | 韩旭 李志 吴耀军 张志民 黄剑斌 黄龙飞 |
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| 作者单位： | 中国空间技术研究院钱学森空间技术实验室，北京 100094 |
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| 基金项目： | 北京市科技计划（Z181100003018001） |
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| 摘 要： | 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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| 关 键 词： | 激光雷达 伪随机码调制 盖革模式 |
| 收稿时间： | 2021-04-19 |
High precision ranging lidar based on pseudorandom code modulation |
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| Affiliation: | Qian Xuesen Laboratory of Space Technology of China Academy of Space Technology, Beijing 100091, China |
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| Abstract: | Pseudo random code modulated laser ranging system could detect high frequency and low peak power by emitting high-order modulated laser, and achieve high signal-to-noise ratio by using high frequency detection and statistics. The system has the characteristics of small volume and light weight. It is a lidar system suitable for long distance. However, the measurement accuracy is related to the modulation frequency. In the past, high modulation frequency was usually used to achieve high-precision measurement. A laser radar prototype modulated by pseudo-random code was developed, which adopted 100 MHz modulation repetition rate, optical antenna with pupil diameter of 0.1 m. Through Gaussian statistics of the echo signal in the cycle, the high-precision ranging of 0.1 m was achieved in the laboratory environment when the signal-to-noise ratio was 5. Through theoretical and experimental analysis, it is proved that the measurement accuracy can be effectively improved by increasing the clock frequency and signal-to-noise ratio. |
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