非均匀地面参数对短波阵列测向的影响  

Influence of inhomogeneous ground parameters on HF direction finding

作　　者：任晓飞[1] 李虎[1] 朱金鹏[1] 王敏男[1] 何绍林[1] 宋晓远 REN Xiaofei;LI Hu;ZHU Jinpeng;WANG Minnan;HE Shaolin;SONG Xiaoyuan(China Research Institute of Radiowave Propagation,Qingdao 266107,China)

机构地区：[1]中国电波传播研究所,青岛266107

出　　处：《电波科学学报》2023年第4期714-720,共7页Chinese Journal of Radio Science

摘　　要：针对非均匀地面参数引起的短波测向误差问题,导出了含有地面参数的测向阵列流形模型,给出了水平极化和垂直极化两种圆形阵列流形的具体表达式,并利用多重信号分类(multiple signal classification,MUSIC)方法对地面参数不均匀性导致的两种阵列测向误差进行了仿真.仿真结果表明:对沿着地面参数不均匀区分界方向的来波信号,方位角测向明显存在较大的测向误差;在低电导率的非均匀地面,地面相对介电常数的变化对方位角测向误差有着显著影响,可达到2°~3°;非均匀地面参数对垂直极化阵列测向误差要比水平极化阵列高出1°~2°.因此在短波固定测向站建设时,尽可能选址高电导率区域,并铺设地网改善天线场地的均匀性,来消除非均匀地面参数变化引起的测向误差.The array manifold with ground parameters is derived for the HF direction finding(DF)error caused by the inhomogeneous ground parameters.Two kinds of circular array manifolds concluded of horizontal polarization and vertical polarization are given.The DF error is simulated with the MUSIC method for the two kinds of DF array.Simulation results show that there is obvious DF error of azimuth angle in the non-uniform boundary zone;on nonuniform ground with low conductivity,there is a significant DF error with the change in relative dielectric constant of the ground,which can reach 2°–3°;the DF error of vertical polarization array is about 1°–2°greater than the error of horizontal array.During construction of HF direction finding station,it is necessary to select areas with high conductivity,and lay a metal grid on the ground to eliminate DF errors caused by changes in ground parameters.

关 键 词：非均匀 短波阵列 测向 地面参数 多重信号分类(MUSIC) 

分 类 号：TN828[电子电信—信息与通信工程]