低频宽带低空地面反射特性建模仿真及验证  

Simulation and Verification for Low Altitude Ground Reflection Characteristics of Low-frequency Broadband Signal

作　　者：马占南 杜飞飞[1] 陈金喜[1] 

机构地区：[1]江南机电设计研究所,贵阳550009

出　　处：《系统仿真学报》2017年第10期2582-2587,共6页Journal of System Simulation

基　　金：国防基础科研项目(0420132104)

摘　　要：低频宽带信号在提高雷达对目标的识别能力方面具有优势。为确定宽带信号的低空地面反射系数,本文对低频宽带信号的低空反射特性进行建模,提出了通过窄带各频点的地面反射系数来合成宽带信号等效地面反射系数的方法。通过仿真分析研究了宽带信号等效地面反射系数与地面特性(相对介电常数、电导率)、擦地角、天线极化特征的关系,确定了宽带信号的等效地面反射系数,并通过典型环境下低空天线方向图测试的方法,对典型环境地面反射系数进行测试,校验结果表明了宽带信号等效地面反射系数模型的有效性,为宽带雷达目标探测提供一定的理论依据。Low frequency broadband signals have advantages in improving radar target recognition ability. To determine the ground reflectance of broadband signal at low altitude, the ground reflectance of different frequency points of narrowband is used to compose the equivalent ground reflectance of broadband signal based on ground reflection model. The relationship between ground reflectance and ground characteristics （relative dielectric constant, conductivity）, grazing angle, and polarization characteristics were discussed in detail. The reflectance in typical environment was verified using the method of antenna pattern test at low altitude. Results show that the reflectance simulation model was effective, and the model provides theoretical basis for broadband radar target detection.

关 键 词：宽带信号 低空 天线方向图 地面反射 

分 类 号：TN957.51[电子电信—信号与信息处理]