提高FMCW激光雷达距离分辨率的研究

Study on Improving Range Resolution of FMCW Lidar

随着物联网技术的发展,距离分辨率是FMCW激光雷达用来在环境监测领域测量颗粒物、臭氧、温度和湿度的变化等的重要影响因素。本文把IQ调制器应用于FMCW激光雷达对信号的幅度和相位同时进行调制,通过仿真实验验证了可行性,搭建了系统的实验平台,实验结果表明该FMCW激光雷达的距离分辨率提高了一倍。为了优化激光雷达的调制过程,利用IQ调制器的同相(I)和正交(Q)分量相互正交、互不相干的特性,同时利用同相(I)和正交(Q)两个信道,通过后处理使线性啁啾信号的I、Q分量的相位保持连续,成倍地提高了FMCW激光雷达的距离分辨率。

With the development of Internet of things technology, the range resolution is an important influencing factor for FM. CW lidar which is used to measure the changes of particulate matter, ozone, temperature and humidity in the field of environmental monitoring. In this work, an IQ modulator is proposed to modulate the amplitude and phase of the signal at the same time. The feasibili. ty was verified by simulation experiment, and the experimental platform of system was built. Results shown the range resolution of the FMCW lidar was doubled. In order to optimize the laser radar modulation process by using the IQ modulator in phase (I) and quadra. ture (Q) components, and orthogonal discrete features. At the same time two channel of that in phase (I) and quadrature (Q) by post-pro. cessing I and Q components to keep continuous. Therefore, optimizing laser exponentially improved the range resolution of FMCW lidar.