正交调制降频相位式激光测距

发布时间：2018-01-14 17:02

本文关键词：正交调制降频相位式激光测距　出处：《光学精密工程》2017年08期 　论文类型：期刊论文

【摘要】：为了提高激光测距的精度与稳定性,通过改良传统相位激光测距仪,设计了新型正交调制降频与最小二乘法解相位的相位式激光测距仪。使用反射镜实现内外测距光路,通过正交调制技术对发射激光进行幅度调制,接收模块接收到的回波信号经过混频器后再经过低通滤波器将回波信号降频,降低解相难度并提升解相精度。改用分时测量得到距离相位从而消除二次混频方法所产生的附加相移,分别对内外光路低频回波信号采样进行模数转换后使用最小二乘法求解相位。采用多频率调制测量兼顾激光测距范围与测量精度,最后通过超定方程解模糊算法求解多频测距的待测距离。在国家标准基线上进行样机测试,实验结果表明,在60m量程内正交调制激光测距仪的测量平均误差控制在1.5mm以内,测距量程内标准差保持在0.9mm以内。
[Abstract]:In order to improve the accuracy and stability of laser ranging, the traditional phase laser rangefinder is improved. A new phase laser rangefinder is designed, in which the frequency reduction of orthogonal modulation and the phase of the phase are solved by the least square method. The reflection mirror is used to realize the optical path of internal and external ranging, and the amplitude modulation of the emitting laser is carried out by the orthogonal modulation technique. The echo signal received by the receiving module passes through the mixer and then through the low-pass filter to reduce the frequency of the echo signal. In order to reduce the difficulty of phase resolution and improve the precision of phase resolution, the distance phase can be obtained by time-sharing measurement to eliminate the additional phase shift generated by the secondary mixing method. The phase is solved by the least square method after the sampling of the low frequency echo signal of the internal and external optical path is carried out respectively. The range of laser ranging and the measuring precision are taken into account in the measurement of multi-frequency modulation. Finally, the distance to be measured is solved by solving the fuzzy algorithm of overdetermined equation. The prototype test is carried out on the baseline of national standard, and the experimental results show that. The average error of the laser rangefinder with orthogonal modulation is controlled within 1.5 mm and the standard deviation of the range is kept within 0.9 mm within 60 m range.
【作者单位】：武汉大学电子信息学院;
【基金】：国家重点基础研究发展计划资助项目(No.2011CB707904)
【分类号】：TH744.5;TN249
【正文快照】： 1引言激光测距技术以其非接触、实时快速、高精度和大范围等优点广泛应用于工业制造、航空航天以及遥感等领域。随着测量要求的不断提高,激光测距仪的尺寸、精度以及测量速率也不断提升[1-2]。激光测距原理主要分为三角法、干涉法以及飞行时间法三类。其中,飞行时间测距法因测

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