关键参数先验的车载雷达镜头杂散光抑制模型研究

打开文本图片集

关键词：车载激光雷达；长焦光学系统；杂散光抑制;点源透过率；消光处理中图分类号：0439 文献标志码：A doi：10.37188/CO.2025-0074 CSTR：32171.14.CO.2025-0074

Abstract： Stray light interference in vehicular LiDAR systems can reduce the signal-to-noise ratio and degrade detection eficiency. To mitigate this issue， this paper proposed a surface scattering modeling method based on the spectral power density function and total integrated scatering， which fits the bidirectional reflectance distribution function （BRDF） for various material surfaces.The model calculation results were highly consistent with the measured BRDF data， verifying the effectiveness of the method. Based on this model， the study systematically analyzed the sources and propagation paths of stray light in the long-focallength receiving optics of vehicular LiDAR， with specific attntion to scattering from the housing's iner wals，lens edges，and spacer ring surfaces. According to the simulation results，we put forward a number of stray light suppression measures，such as using structural components made of low-scattring materials， coating anti-reflection films on lens surfaces，and applying light-absorbing ink to the non-optical areas of lenses， etc.Furthermore， from optical design， signal processing and engineering optimization，the stray light suppression level of this LiDAR receiving optical system was evaluated in multiple dimensions. The experiment results showed that the level of stray radiation in the optimized system was significantly reduced.The point source transmittance （PST） outside the imaging field of view was reduced from 1×100 to 1×10-5 ，the PST in the field of view was reduced from 1×102 to 1×10-1 ， and the stray light contrast with the target signal was controlled below 1×10-4 . Additionally， the intensity of the detected echo signal is significantly improved， thereby efectively enhancing the detection performance of the LiDAR.This study provides a theoretical model and practical solutions for stray light suppression in vehicle-mounted LiDAR，oering valuable references for the design and optimization of high-sensitivity optical systems.

Key words： vehicle-mounted LiDAR; telephoto optical system; stray light suppression; point source transmittance;anti-reflection treatment

1引言

车载激光雷达作为一种主动探测技术，通过发射近红外激光并接收目标反射信号，可以为自动驾驶系统提供高精度的环境感知信息。（剩余12320字）