A High-precision FMCW Lidar Ranging System Based on Dual-path Error Compensation Algorithm

摘要

Aiming at the problems of laser nonlinearity and system environment interference that bring errors to high-precision distance measurement, a composite fiber dual-path Frequency Modulated Continuous Wave(FMCW) laser heterodyne high-precision ranging compensation system is proposed. The measurement mathematical model of the dual-path heterodyne detection system has been established, and the sources of the errors between the nonlinear term and the beat signal was deduced, and the feasibility of the method and the measurement were analyzed through simulation. We also analyzed the feasibility, accuracy of this method by simulation and the average error of the distance measurement is obtained by repeated experiments at different distances. The ranging simulation experiment was carried out within 100 meters and get the experimental results showed that the ranging system based on the FMCW dual-path compensation method the relative error of ranging was 0.2%, within 30m can be less than 0.1%.