中文摘要：

为降低背景噪声对测距精度影响,提出一种基于双通道的差分光路测距方法。该方法采用双探测器接收回波信号,在最佳位置进行回波差分,将峰值时刻鉴别转化为过零点鉴别,有效抑制了背景噪声及脉宽展宽对测距性能的影响。通过搭建差分光路测距系统,针对50 m处的漫反射目标对比测距实验误差,实验结果表明：在有背景噪声的情况下,相比较传统单光路测距方法,采用差分光路将测距误差均方根由95 mm降至70 mm。同时,验证了当差分距离为光速与回波脉宽的乘积时,可获得最高的探测灵敏度。

英文摘要：

In order to decrease the effects of background noise on ranging accuracy,a ranging method based on differentialoptical-path was proposed. Two receivers were adopted to receive echo signal,and peak discriminator was transformedinto zero-crossing discriminator when two receivers were in the best position,which can efficiently suppress the effects ofbackground noise and pulse width broadening on the ranging performance. The differential optical-path ranging system isbuilt, and comparative ranging experiments are carried out for diffuse reflection target at 50 m. The experimental resultsshow that the proposed method can make the root-mean-square of ranging error decrease from 95 mm to 70 mm under thecondition of background noise comparing with traditional single optical path ranging method. Meanwhile, the highest sensitivityis obtained when differential distance is multiply by light speed and pulse width.