摘要
本文首次提出了利用散射矩阵提取目标旋转对称特征的具体方法.首先,引入了度量目标旋转对称特征的两个参数——目标的旋转对称参数,然后给出了它们的计算公式以及与散射矩阵元素的关系,并讨论了这些参数随目标特征参数的变化情况,最后求出了一些特殊目标的旋转对称参数的大小,从而为根据散射矩阵去分析目标的形状特征提供了重要的依据.
In order to describe geometric characteristic of a radar target, Huyncn in 1978[1] provided some parameters (called Huyncn's characteristic parameters). But it is tedious to calculated these parameters by Huynen's method. Lin in 1990[2] gave a simple method to calculated Huynen's characteristic parameters of a radar target. However, Huynen's parameters cannot describe the 'rotating-symmetric' characteristic of a radar target, 'rotating-symmetric' characteristic is a new term suggested by the authors. The description of this characteristic requires the use of a pair of parameters. In this paper, a method is believed to be provided for the first time for extracting the 'rotating-symmetric' characteristic of a radar target from its scattering matrix. First, two definitions of the 'rotating-symmetric' characteristic parameters are proposed for describing the 'rotating-symmetric' characteristic of a radar target. Then, by use of the resolution of scattering matrix and Mueller matrix corresponding to scattering matrix, the formulas to calculate the 'rotating-symmetric' parameters are provided (eqs. 9a, 9b and 15), the relations between these parameters and the elements of target's scattering matrix are obtained (eqs. 10a, 10b and 14), and the relations between the 'rotating-symmetric' characteristic parameters and Huyncn's parameters are obtained (eqs. 16a, 16b and 17). Besides, it is found that the larger the characteristic angle of a rader target is, the larger the 'rotating-symmetric' parameters. Finally, the 'rotating-symmetric' parameters'values of some special targets (sphere, line target, N-target and raindrops) are given (tables 1 and 2). From the above results, the authors believe that: it is suitable to use a pair of parameters for describing the 'rotating-symmetric' characteristic of a radar target.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1993年第3期364-370,共7页
Journal of Northwestern Polytechnical University
基金
国防科技预研基金(92J3.05)
关键词
散射矩阵
雷达目标
旋转对称参数
scattering matrix
Mueller matrix
target characteristic
extraction