光学精密工程2017，Vol.25Issue(8)：1979-1986,8.DOI:10.3788/OPE.20172508.1979
正交调制降频相位式激光测距
Phase laser ranger based on quadrature modem and frequency reduction
摘要
Abstract
A novel laser range finder method based on the quadrature modem and least square method was investigated to improve the accuracy and reliability of traditional portable phase laser range finders.A reflector was employed for inner and outer optical paths.After amplitude modulation of laser intensity by the quadrature modulation method, the echo signal was mixed with modulation signal and passed through a low-pass filter to reduce the frequency, thus simplifying phase detection and improving solution accuracies.The inner and outer phase shifts were used to eliminate the additional phase shift lead by the secondary mixing.The low frequency echo signal from the inner and outer optical path were sampled for analog to digital conversion respectively, then the phase was solved base on the least square method.Multi-frequency measurement was adopted to maintain the laser ranging range and measurement accuracy.Finally, the measured distance was obtained by solving the laser ranging ambiguity by overdetermined linear equation.The proposed range finder was experimented on the national standard baseline.The results show that the prototypes of those rangers exhibit an average measurement error less than 1.5 mm and an standard deviation less than 0.9 mm in the range of 0~60 m.关键词
激光测距/正交调制/最小二乘法/超定方程/解模糊Key words
laser ranging/quadrature modem/least square method/overdetermined equation/ambiguity resolution分类
信息技术与安全科学引用本文复制引用
许贤泽,翁名杰,徐逢秋,白翔..正交调制降频相位式激光测距[J].光学精密工程,2017,25(8):1979-1986,8.基金项目
国家重点基础研究发展计划资助项目(No.2011CB707904) （No.2011CB707904）
