摘要
为了实施对地面目标的精确打击,空中飞行器上的雷达首先需要对地面目标精确定位.由于雷达电波在大气中传播时会产生折射误差,因而会影响雷达定位精度.针对有关部门的实际需求,以及目前大气折射误差修正基本上都是基于地基雷达的现状.通过选择高精度的对流层和电离层大气模型,利用全国对流层大气参数和电离层大气浓度剖面建立大气折射率剖面数据库.根据电波传播理论,利用射线描迹法推导出了位于电离层中俯视雷达的大气折射误差修正模型和定位误差模型.仿真实验表明,大气折射效应对高空俯视雷达探测精度影响很大.利用该模型可极大地提高俯视雷达的定位精度,为有效打击地面目标奠定基础.
In order to implement the precise hit against ground targets,the radar on the aircraft first needs taccurate positioning for ground targets.Radar waves propagation in the atmosphere will produce refraction error,which affects the radar positioning accuracy.In view of the actual needs of relevant departments and the current situation that atmospheric refraction error correction is basically based on the ground radar,atmospheric refractive index profile database is established by selecting the troposphere and ionosphere atmospheric model in the high precision and using the troposphere atmosphere parameter and the ionosphere atmospheric concentration profile.According to the theory of wave propagation,line tracing method is used to deduce the atmospheric refraction error correction model and positioning error model of the down-looking radar in the ionosphere.Simulation experiments show that atmospheric refraction makes great influences on the detection accuracy of the downlooking radar at high altitude.The positioning precision of the down-looking radar can be greatly improved and the foundation of effective hit against ground targets is made by using this model.
出处
《河南师范大学学报（自然科学版）》
CAS
北大核心
2014年第6期47-50,74,共5页
Journal of Henan Normal University(Natural Science Edition)
基金
国家自然科学基金(61077037)
关键词
大气折射误差
电离层
模型
俯视雷达
atmosphere refracting error
ionosphere
model
down-looking radar
