P和L波段的典型地物雷达散射系数的研究

Research on Radar Backscatter Coefficient of Typical Objectsin P-Band and L-Band Electromagnetic Wave

能够反映地物散射特性的雷达散射系数应用前景广泛,具有重要的学术价值。国内外对于L波段同极化和交叉极化雷达散射系数的差值的相关研究较少,且暂无公开的P波段典型地物的雷达散射系数数据,为了弥补这一现状,文章结合国内外实测数据分析了P波段和L波段雷达散射系数和入射角的变化关系,并对L波段和P波段典型地物的雷达散射系数进行了比较。结果表明:L波段HH极化和HV极化雷达散射系数的差值随着入射角的增大而减小,在40°入射角时,典型地物的差值在10~13 dB;P波段典型地物雷达散射系数随着入射角的增加而减小,且比L波段小1~2 dB;P波段HH极化和HV极化雷达散射系数差值随着入射角的增大而减小。文章的研究为P、L波段雷达的遥感应用积累了数据,为极化SAR反演目标信息提供帮助和借鉴。

In the military and civilian fields,the study of radar scattering coefficient has significant academic value and broad application prospects.Research on the difference between the co-polarization and cross-polarization scattering coefficient is relatively litter.P-band radar scattering coefficient data for typical objects is no publicly available.Initially,this paper studies scattering characteristics of typical objects in the L band.The relationship between radar scattering coefficient and incident angle is analyzed based on the measured data at home and abroad,and the differences between HH polarization and HV polarization are compared.Furthermore,the radar scattering coefficients of typical ground objects in P band are calculated based on the recently radar flight test.The relationship between radar scattering coefficient and incident angle is also analyzed.The differences between HH polarization and VV polarization are calculated.Lastly,radar scattering coefficient of P and L band is compared.Results demonstrate that L-bandradar scattering coefficient difference between HH polarization and HV polarization decreases with increasing incident angle.At a fixed incidence angle of 40°,radar scattering coefficient is about 10~13 dB.P-band theradar scattering coefficient decreases with increasing incident angle,which is 1-2 dB lower than L-band radar scattering coefficient.P-bandradar scattering coefficient difference between HH polarization and HV polarization decreases with increasing incident angle.The research in this paper can accumulate data for remote sensing application of P and L land radar,and provide help and reference for polarimetric SAR to retrieve target information.