自动驾驶雷达频段降雨环境散射特性建模分析  

Modeling and Analysis on Scattering Characteristics Automatic Driving Radar Bands in Rainy Environment

作　　者：邹梦凡 何晓雨[1] Zou Mengfan;He Xiaoyu(School of Electronic Information Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《系统仿真学报》2023年第10期2161-2169,共9页Journal of System Simulation

摘　　要：现代通信与雷达系统的工作频段已延伸至毫米波及太赫兹频段,定量分析降雨环境对该频段电磁信号传输的影响对应用系统十分重要。根据Mie理论建立了降雨环境电磁信号衰减仿真计算模型,采用不同雨滴尺寸分布模型计算了频率在1 GHz~1 THz的电磁信号在降雨环境中传输的衰减,并与ITU(international telecommunication union)经验模型进行比对以验证计算模型的有效性。针对自动驾驶雷达芯片工作频段计算了不同降雨环境条件下电磁信号散射的空间分布特性,从信号衰减与雨杂波散射的空间分布特性两方面分析降雨环境的散射特性。结果表明:在大雨和暴雨天气下77 GHz信号的衰减高于10 dB/km,显著影响信号的传输距离。The operating frequency band of modern communication and radar systems has extended to millimeter wave and terahertz frequency band,and the analysis on propagation characteristics of electromagnetic signals in rainy environment is important.A calculation model through Mie scattering theory is built to simulate the attenuation and the scattering of electromagnetic signals in rainy environments.Different types of raindrop size distribution function are adopted to analyze the propagation attenuation under different rainfall of frequencies spanning from 1 GHz to 1 THz.Experimental results are compared with international telecommunication union(ITU)half-empirical model to verify the validation of the model.Subsequently,the spatial distribution characteristics of the scattered electromagnetic signals are calculated under different rainfalls of the autonomous driving radar bands.The scattering characteristics of rainy environment are analyzed from two aspects,the signal attenuation and the spatial distribution characteristics of the scattered signal.The results show that the attenuation of 77 GHz signal is higher than 10 dB/km under heavy rain and rainstorm condition,which significantly reduces the signal propagation distance.

关 键 词：降雨衰减 MIE散射 散射相位函数 雨滴尺寸分布 雷达波 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]