高精度的脉冲激光测距系统一直都是激光测距领域的研究热点之一。测距误差的存在直接影响了激光测距精度的结果, 利用差分信号时刻鉴别法的研究未见报道, 因此对差分时刻判别法的研究具有重要意义。为了研究这一问题, 对影响脉冲激光测距精度的因素进行了分析, 可以认为幅度时间游动效应和上升时间游动效应产生的时间晃动是影响测距精度最主要的因素。通过分析可以看出, 所设计的差分信号时刻鉴别电路能够有效提高测距精度, 达到了设计要求。在实验测试中,差分信号时刻鉴别电路对70 m内不同距离的单次测距误差保持在9 mm以内, 相比之下单端信号时刻鉴别电路的单次测距精度范围为[-12 mm,11 mm]。实验结果表明同单端信号单次测距误差相比, 测距精度有了明显的提高。该方法可以为现有的如何提高脉冲激光测距精度技术提供参考价值。

High-precision pulsed laser ranging system is always one of the hot topics in the field of laser ranging finder. The existence of ranging error has a direct impact on the results of laser ranging accuracy. The study of differential signal moment discrimination has not been reported. Therefore, it is of great significance to study the differential time discrimination method. The factors affecting the accuracy of pulsed laser ranging were analyzed. It was considered that the time jitter caused by the amplitude-time swimming effect and the rise-time swimming effect was the most dominant factor affecting the ranging accuracy. It can be seen from the analysis that the differential signal time discrimination circuit designed can effectively improve the ranging accuracy and meet the design requirements. In the experiment, the single-distance measurement errors of different distances (<70 m) were kept within 9 mm by the differential signal time discrimination circuit. The single-end signal time discrimination circuit had a single range accuracy ranging from [-12 mm, 11 mm]. Compared with the single-end signal single-distance measurement error, the ranging accuracy is significantly improved. This method can provide reference value for how to improve the accuracy of pulsed laser ranging technology.