粗糙路面检测链路模型研究  

Research on Rough Road Detection Link Model

作　　者：杨祎 张磊磊 阮驰[2] 贺锋涛 赵梓轩 焦梁 YANG Yi;ZHANG Leilei;RUAN Chi;HE Fengtao;ZHAO Zixuan;JIAO Liang(School of Electronic Engineering,Xi′an University of Posts and Telecommunications,Xi′an 710121,China;Xi′an Institute of Optics and Precision Mechanics of CAS,Xi′an 710119,China)

机构地区：[1]西安邮电大学电子工程学院,西安710121 [2]中国科学院西安光学精密机械研究所,西安710119

出　　处：《光子学报》2024年第7期204-216,共13页Acta Photonica Sinica

基　　金：陕西省重点研发计划项目(No.2022GY-298)。

摘　　要：粗糙路面的反射特性影响路面检测系统的性能和路面气象检测的准确性,根据传统微面元模型,提出了一种多参量半球形等效仿真模型,建立了基于无线激光的粗糙路面链路传输模型。通过采用蒙特卡洛统计方法,分析了反射光在不同入射角和粗糙度情况下接收光功率的变化以及光子的分布规律。基于该模型,设计并实现了一套850 nm波长的非接触式激光路面状况检测系统,并利用该系统验证模型的准确性。仿真及实验结果均显示,随着入射光与路面法线方向夹角(入射角)的增大,接收到的光功率逐渐减小。当入射角小于15°时,粗糙度的增加与接收的光功率负相关;入射角大于15°时,随着粗糙度的增加,接收到的光功率逐渐增加,粗糙度越大,接收光功率与入射角的衰减关系越接近线性;当入射角达到60°时,接收到的光功率趋于常数。实验结果与模型仿真结果相吻合,从而验证了粗糙路面光反射等效半球形模型的有效性,且接收的回波信号信噪比不受路面粗糙度影响。Non-contact road surface meteorological detection technologies have emerged as a significant area of development due to their non-destructive impact on the road foundation and the simplicity of installation and maintenance.Typically,these non-contact road surface meteorological detection technologies utilize optical detection methods,and factors such as the roughness of the road surface and the optical angle of incidence significantly influence the system′s performance and the accuracy of the meteorological measurements.According to the optical geometric ray method,an improved microfacet model is proposed,which introduces multiple random parameters generated by the reflection of light from rough road surfaces,and establishes a hemispherical equivalent simulation model.This model microscopically elucidates the reflective properties of photons when interacting with rough road surfaces,and it allows for the convenient and precise simulation and analysis of the distribution of photons after reflecting off rough surfaces.Building on this,a rough road surface link transmission model based on wireless laser transmission theory has been developed to study and simulate the optical power characteristics received by the detection system under different road roughness levels and angles of incidence.The random distribution function of the normals of road microfacets under varying degrees of roughness is obtained by using refusal sampling technique,which determines the changes in photon reflection direction,and the distribution state of photons after reflection from the rough surface is statistically analyzed by using the Monte Carlo method,which derived the variations in reflected optical power under different angles of incidence and road roughness conditions.Subsequently,the validity of the model is confirmed.For the experimental design,a non-contact laser-based road surface meteorological condition detection system operating at a wavelength of 850 nm is constructed,which mainly consists of the light source drive circuit w

关 键 词：路面气象检测系统 微面元模型 半球形等效模型 链路传输模型 粗糙路面。 

分 类 号：TN929.1[电子电信—通信与信息系统]