基于正交投影的GTD模型参数估计方法

An orthogonal projection-based approach for parameter estimation of GTD model

雷达目标散射中心的参数估计在目标高频电磁散射特性分析和识别中有着许多重要的应用。以几何绕射(GTD)模型为基础,提出了一种基于正交投影的模型参数估计方法。该方法依据GTD模型中散射中心位置与类型参数的低耦合,利用信号子空间的平移不变结构估计散射中心的位置,根据频率依赖项的正交投影系数对类型参数进行鉴别。由于整个估计过程一次完成,因此,具有较低的计算复杂性。仿真实验结果表明:该方法具有较高的估计精度和良好的推广性能。

Parameter estimation of radar target scattering center plays an Important role in the applications of high frequency electromagnetic scattering characterization analysis and target recognition. Based on the （geometrical theory of diffraction GTD） model, an orthogonal projection-based method for parameter estimation is presented. According to weak coupling between scattering center position and type parameter in GTD model,we firstly utilize the shift-invariance structure of the sig- nal subspace to estimate the position of scattering center,and then employ orthogonal projection of frequency-dependent term to determine the appropriate scattering type. The sequential estimation schema largely reduces computational complexity. The numerical simulations indicate that the method can achieve accurate estimation and possess well bandwidth-generalized performance.