一种基于GTD模型的目标散射中心提取方法

随着隐身技术的发展,臆身目标的镜面散射已基本消除.边缘绕射等上升为主要散射源.用基于几何绕射理论的GTD模型取代以镜面散射为主的常规目标的指数和散射模型,来精确描述隐身目标的高频电磁散射特性.并且采用旋转不变技术(TIS_ESPRIT)替代多重信号分类(MUSIC)算法,精确估计目标散射中心的位置信息,避免了MUSIC算法用谱峰搜索提取参数的过程.并时TLS_ESPRIT算法进行了改进,有效降低其计算量.同时,利用特征分析法的信号与噪声子空间正交特性、二项式近似两种方法来提取散射中心的类型参数.仿真结果表明,该算法高效、精确、具有良好的分辨率,可以有效地提取以边缘绕射等为主要散射形式的臆身目标的散射中心.

Method of scattering center extraction based on GTD model

As the development of stealth technology,the specular scattering of stealthy objects has been basically eliminated.Therefore,the edge diffraction has been one of the main scattering centers of the stealthy objects.The GTD model is introduced to describe the high frequency electromagnetic scattering of the stealthy objects instead of the DE model describing the normal objects mainly by studying their specular scattering.Meanwhile,the TLS_ESPRIT method,unlike the MUSIC method which needs searching procedure,is employed to estimate the position of scattering centers.Moreover,it is improved to decrease the computational load efficiently.At last,the orthogonal property of signal with noise subspaces and the approximating of the binomial are utilized to estimate the types of the scattering centers.The simulating results show the proposed method is efficient and accurate and has good resolution.Extraction of the scattering centers from the stealthy objects is feasible.