一种基于相位测量的快速高精度大范围的激光测距法

A laser ranging method with high precision and large range in high speed based on phase measurement

为满足快速、高精度和大范围的激光测距需求,分析了现有单频和多频相位激光测距方法存在的问题,提出了基于降频及高精度测时技术的相位激光测距方法,并根据测距要求以及按照测尺频率、测时精度和参考频率的顺序建立了测距系统参数选择模型,进而按照测距参数需求搭建了实验系统。实验表明,在300kHz单频测尺、260kHz参考频率和50ps测时精度条件下,实验系统具有500 m测距范围、1.08mm测距精度和0.03~0.04s测量速度,可为快速、高精度和大范围测距奠定基础。

In order to meet the needs of high speed, high-precision and large-range laser ranging, the ana- lyses of the problems are discussed on both single frequency and multi-frequency laser ranging methods based on phase-shift measurement. Based on characteristics of the needs of ranging speed, precision and ranging range,the laser ranging method with phase-shift measurement is proposed based on the tech- niques of frequency reduction and high precision time measurement. Moreover, the method of parameters selection on ranging system is established based on the ranging needs in sequential order of the ranging frequency, time-measurement precision and reference signal frequency, and also the experimental ranging system is set up to verify the ranging method under the conditions of many fileds with high speed,high- precision and large-range laser ranging. The experiment is performed and the experimental results show that the system has a ranging range of 500 m,a ranging precision of 1.08 mm and a ranging speed of 0.03-0.04 s under the conditions of a 300 kHz ranging signal of modulation,a 260 kHz reference signal and a time-measurement precision of 50 ps. The experiment verifies the effectiveness of the ranging method and system, which can lay the foundations for the high speed, high-precision and large-range ran- ging.